GT 1030 / GT 2030 E1 HDSL Units Operation Manual - GDC

DataCommGeneral

GT 1030 / GT 2030 E1 HDSL Units

Operation Manual

073R500-000Issue 01

GT 1030 / GT 2030 E1 HDSL Units

Operation Manual

073R500-000Issue 01

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Safety Guidelines

Always use the following guidelines when unsafe conditions exist or when potentially haz-ardous voltages are present:

• Always use caution and common sense.

• To reduce the risk of electrical shock, do not operate equipment with the cover remove

• Repairs must be performed by qualified service personnel only.

• Never install telephone jacks in a wet location unless the jack is designed for that loca

• Never touch uninsulated telephone wires or terminals unless the telephone line is disconnected at the network interface.

• Use caution when installing telephone lines and never install telephone wiring during aelectrical storm.

Antistatic PrecautionsElectrostatic discharge (ESD) results from the buildup of static electricity and can cause comcomponents to fail. Electrostatic discharge occurs when a person whose body contains a stbuildup touches a computer component.

The equipment may contain static-sensitive devices that are easily damaged and proper haand grounding is essential. Use ESD precautionary measures when installing parts or cards athe parts and cards in antistatic packaging when not in use. If possible, use antistatic floorpaworkbench pads.

When handling components, or when setting switch options, always use an antistatic wrist sconnected to a grounded equipment frame or chassis. If a wrist strap is not available, periodically touch an unpainted metal surface on the equipment. Never use a conductive tool, like a screwdriveor a paper clip, to set switches.

Canada DOC NotificationThe Industry Canada label identifies certified equipment. This certification means that the equipment meets telecommunications network protective, operation and safety requirementprescribed in the appropriate Terminal Equipment Technical Requirements document(s). ThDepartment does not guarantee the equipment will operate to the user's satisfaction.

Before installing this equipment, users should ensure that it is permissible to be connected facilities of the local telecommunications company. The equipment must also be installed usacceptable method of connection. The customer should be aware that compliance with the conditions may not prevent degradation of service in some situations.

Repairs to certified equipment should be coordinated by a representative designated by the sAny repairs or alterations made by the user to this equipment, or equipment malfunctions, mathe telecommunications company cause to request the user to disconnect the equipment.

Users should ensure for their own protection that the electrical ground connections of the poutility, telephone lines and internal metallic water pipe system, if present, are connected togThis precaution may be particularly important in rural areas.

Caution: Users should not attempt to make such connections themselves, but should contaappropriate electric inspection authority, or electrician, as appropriate.

Notice: The Ringer Equivalence Number (REN) assigned to each terminal device provides aindication of the maximum number of terminals allowed to be connected to a telephone inte

ii GDC GT 1030 / GT 2030 073R500-000 Issue 01

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The termination on an interface may consist of any combination of devices subject only to threquirement that the sum of the Ringer Equivalence Numbers of all the devices does not ex

DeutschlandInstallations Anweisungen: Installieren Sie die Telefonleitungen nicht während eines GewitteInstallieren Sie die Telefonleitungen nicht in einem feuchten Raum, auβer die Dose entspricht denVorschriften für Feuchträume. Berühren Sie unisolierte Telefonleitungen oder Einrichtungen auβer diese sind vom Telefonnetz getrennt. Vorsicht bei der Installierung oder Änderung voTelefonleitungen. Achtung: Es gibt keine durch den Benutzer zu wartende Teile im Gerät. Wartdarf nur durch qualifiziertes Personal erfolgen.

Public Telecommunications NetworksThe presence of this symbol indicates that this equipment is not intended to be connected to a public telecommunications network. The connection of such equipment to a public telecommunications networEuropean Community Member State will be in violation of the national law implementing Directive 91/263on the approximation of the laws of the Member States concerning telecommunication terminal equipmeincluding the mutual recognition of their conformity

EC Declaration of ConformityWe: General DataComm Limited

Molly Millars LaneWokingham, Berkshire RG41 2QF, United Kingdom

On behalf of: General DataComm Inc.1579 Straits TurnpikeMiddlebury, CT 06762-1299, U.S.A.

The products to which this declaration relates are in conformity with the following relevant harmonized standards, the reference numbers of which have been published in the Official Jof the European Communities;

Electromagnetic Compatibility

EN55022: 1994

Specification for limits and methods of measurement of radio interference characteristics ofinformation technology equipment.

EN 50082-1: 1992

Generic immunity standard Part 1 Residential, Commercial, and Light Industry.

Safety

EN 60950: 1995 A1 through A3

Low Voltage Directive relating to electrical equipment designed for use within certain voltaglimits.

073R500-000 GDC GT 1030 / GT 2030 iiiIssue 01

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Copyright© 1999 General DataComm, Inc. All rights reserved.P.O. Box 1299, Middlebury, Connecticut 06762-1299 U.S.A.

This publication and the software it describes contain proprietary and confidential informationpart of this document may be copied, photocopied, reproduced, translated or reduced to anelectronic or machine-readable format without prior written permission of General DataCommThe information in this document is subject to change without notice. General DataComm asno responsibility for any damages arising from the use of this document, including but not limto, lost revenue, lost data, claims by third parties, or other damages. If you have comments suggestions concerning this manual, please write to Technical Publications, or call 1-203-758

Manual Revision HistoryThe following table provides chronological listing of revisions to this manual. The issue numdate, and synopsis of revised materials are included to provide the reader with a comprehenmanual history.

Related PublicationsThe following table provids a list of related documents, if any. In addition to the hardware ansoftware manuals, always read the software System Release Notes supplied with your GDCproduct.

*For publication numbers, VREV corresponds to the most current revision, and is the currentof the document. When ordering documents, always yequest the most current revision and

Note In keeping with the policy of continuing development carried out by General DataComm Inc., the information in this manual is subject to revision without notice.

Issue Date Description 01 04/1999 First issue.

Related GDC Documents

Publication Name Publication Number*

iv GDC GT 1030 / GT 2030 073R500-000 Issue 01

Preface

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Preface

Scope of the Manual

This manual describes how to install and operate GT 1030 and GT 2030 E1 HDSL Units. Tinformation contained in this manual has been carefully checked and is believed to be entirereliable. However, as General DataComm improves the reliability, function, and design of thproducts, the possibility exists that information may not be current. If you require updated, oother General DataComm product information, contact:

General DataComm, Inc.Park Road ExtensionMiddlebury, Connecticut, USA 06762-1299Tel: 1 203 758 1811Toll Free: 1 800 794 8246

Manual Organization

This manual is divided into the following principle chapters:

Chapter 1 - System Description

Chapter 2 - Installation

Chapter 3 - Operation

Chapter 4 - Tests

Chapter 5 - Application Guide

Use of Special Fonts

This typewriter font shows output that is displayed on the screen or input entered by you.

This bold font is used when referring to window names and menu selections.

The following examples show how Note and Important are used in this manual.

Note Indicates a note. It is something you should be particularly aware of; something not readilyapparent. A note is typically used as a suggestion.

Important Indicates an emphasized note. It is something you should be particularly aware of; something not readily apparent. Important is typically used to prevent equipment dama

073R500-000 GDC GT 1030 / GT 2030 vIssue 01

Preface Safety Information

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Safety InformationThe DANGERS, WARNINGS and CAUTIONS that appear throughout this manual are not opreventative measures designed to uphold the safety of both the service engineer and operaalso enhance equipment reliability.

The definitions and symbols for DANGER, WARNING and CAUTION comply with ANSI Z535.2, American National Standard for Environmental and Facility Safety Signs, and ANSIZ535.4, Product Safety Signs and Labels, issued by the American National Standards Institufollowing examples show how Caution, Warning, and Danger are used in this manual.

TUV required safety information:

CAUTION Indicates a potentially hazardous situation which, if not avoided, may result iminor to moderate injury. It may also be used to alert against unsafe practices.

WARNING Warning indicates an imminently hazardous situation which, if not avoided, could result in death or serious injury.

DANGER Danger indicates an imminently hazardous situation which, if not avoided, wiresult in death or serious injury.

VORSICHTPotentielle Gefahr. Bei Nichtbeachtung besteht die Gefahr von leichter bis mäßiger Verletzung.Wird auch benutzt zum Schutz vor unsicherer Anwendung.

WARNUNGWarnung vor drohender Gefahr. Folge bei Nichtbeachtung könnte Tod oder ernsthafte Verletzunsein.

GEFAHRBei Nichtbeachtung führt zum Tod oder ernshafter Verletzung.

vi GDC GT 1030 / GT 2030 073R500-000 Issue 01

Preface Service Support and Training

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Service Support and Training

VITAL Network Services, a General DataComm company, is committed to providing the servsupport and training needed to install, manage, and maintain your GDC equipment.

GDC’s VITAL Network Services provides hands-on training courses through VITAL Network Services Global Technology Training Services. Courses range from basic data communicationmodems and multiplexers, to complex network and ATM systems. Training courses are avaat our centers in the US, UK, France, Singapore and Mexico, as well as at a customer’s site

For more information regarding GDC's VITAL Network Services’ service programs, training courses, or for assistance with your support requirements, contact GDC's VITAL Network Seat the address or phone number listed below, or visit our website at:

http//www.vitalnetsvc.com

VITAL Network Services World Headquarters6 Rubber AvenueNaugatuck, Connecticut 06770 USA

North America: 1 800 243 10301 888 248 48251 203 729 2461

Training Information:1 203 729 0271French Speaking Canada:1 800 361 2552North America Fax: 1 203 723 5012

1 203 729 7611

VITAL Network Services Regional Sales and Service Offices:

Europe, Middle East, Africa

VITAL Network ServicesMolly Millars CloseMolly Millars LaneWokingham, Berkshire RG41 2QF UK

Telephone: +44 1189 657200Training: +44 1189 657240Fax: +44 1189 657279

Central America, Latin America

VITAL Network ServicesPeriferico Sur 4225, Desp. 306C.P. 14210, Mexico D.F., Mexico

Telephone:+52 5 645 2238Training:+52 5 645 2238Fax:+52 5 645 5976

Asia Pacific

VITAL Network Services501 Orchard Road 05-05Wheelock Place, Singapore 238880

Telephone: +65 735 2123Training: +65 735 2123Fax: +65 735 6889

International Calling Code (+)

When calling from outside the country of origin, use the appropriate International Calling Cwhere the + symbol is shown.

073R500-000 GDC GT 1030 / GT 2030 viiIssue 01

Preface Service Support and Training

viii GDC GT 1030 / GT 2030 073R500-000 Issue 01

Table of Contents

i

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2

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5

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PrefaceSafety Information................................................................................................................... v

Service Support and Training................................................................................................. vii

Chapter 1: System DescriptionFeatures.................................................................................................................................. 1-1

Applications........................................................................................................................... 1

Point-to-Point...................................................................................................................1-

Point-to-MultiPoint...........................................................................................................1-

Fractional G.704 Service..................................................................................................1-2

Diagnostics/Network Management........................................................................................ 1-3

The GT 1030/GT2030 Units.................................................................................................. 1-4

Technical Characteristics..................................................................................................1-4

Chapter 2: InstallationOverview................................................................................................................................ 2-1

Unpacking and Handling....................................................................................................... 2-1

Installation Requirements...................................................................................................... 2-1

Setting Hard Options.............................................................................................................. 2-

DTE Interface Selection......................................................................................................... 2-

Electrical Connections........................................................................................................... 2-

Power................................................................................................................................2-5

Business Equipment Connections....................................................................................2-5

HDSL Line Connections..................................................................................................2-7

Preoperational Configuration Setup....................................................................................... 2-7

Hard.................................................................................................................................2-7

Soft ...................................................................................................................................2-8

Chapter 3: OperationOverview................................................................................................................................ 3-1

Front Panel Description......................................................................................................... 3-

Soft Option Selection............................................................................................................. 3-

Terminal Requirements....................................................................................................3-3

073R500 -000 GDC GT 1030 / GT 2030 ixIssue 01

Table of Contents

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Control Port Characteristics............................................................................................. 3-3

Startup Procedure.................................................................................................................. 3-

Screen Organization.............................................................................................................. 3-

Operating Procedures............................................................................................................ 3-

Menu Selection................................................................................................................ 3-

Field Navigation............................................................................................................... 3-

Field Editing..................................................................................................................... 3

Restoring Default Values................................................................................................. 3-5

Saving Values.................................................................................................................. 3-

Quitting Without Saving.................................................................................................. 3-5

Refresh............................................................................................................................. 35

Main Menu............................................................................................................................ 35

Diagnostics Option........................................................................................................... 3-

Configuration Option....................................................................................................... 3-6

Maintenance Option......................................................................................................... 3-

Diagnostic Menu.................................................................................................................... 3

HDSL Monitoring............................................................................................................ 3-

HDSL Status.................................................................................................................... 3-

Configuration Menu............................................................................................................ 3-1

Unit Configuration Screen............................................................................................. 3-11

Interface Configuration Screen............................................................................................ 3-14

View H/S Configuration................................................................................................ 3-15

Maintenance Menu.............................................................................................................. 3-1

Network Management......................................................................................................... 3-1

MIB Tables.................................................................................................................... 3-1

Chapter 4: TestsOverview............................................................................................................................... 4-1

Troubleshooting Procedures.................................................................................................. 4-1

Maintenance Menu................................................................................................................ 4-

Loopback Testing.................................................................................................................. 4-

Loopback Testing (Hard)................................................................................................. 4-4

Loopback Testing (Soft).................................................................................................. 4-5

Considerations in the Use of Test Loopbacks....................................................................... 4-6

BER Test................................................................................................................................ 4-6

Testing Method................................................................................................................ 4-

Test Configuration........................................................................................................... 4-

BER Screen Description.................................................................................................. 4-8

Reset Statistics................................................................................................................. 4-

Board Reset...................................................................................................................... 4

x GDC GT 1030 / GT 2030 073R500-000 Issue 01

Table of Contents

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2

Chapter 5: Application GuideOverview................................................................................................................................ 5-1

Timing Options...................................................................................................................... 5

High Channel Data Rate Application...............................................................................5-1

Typical Applications.............................................................................................................. 5-

Fractional G.704 Service (1 Loop)...................................................................................5-4

073R500-000 GDC GT 1030 / GT 2030 xiIssue 01

Table of Contents

xii GDC GT 1030 / GT 2030 073R500-000 Issue 01

System Description Features

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Chapter 1: System Description

OverviewThis manual describes installation and operation of GT 1030 and GT 2030 HDSL units manufactured by General DataComm Industries, Inc. Each unit provides N X 64 kbps custodigital data rates. The GT 1030, which supports one HDSL loop, provides selectable data rateN=1 (64 kbps) through N=18 (1152 kbps). The GT 2030, which supports two HDSL loops, proselectable data rates from N=1 (64 kbps) through N=32 (2048 kbps).

The GT 1030 has a maximum data rate of 1152 kbps, and the GT 2030 a maximum of 2048The unit’s interface is selectable, ITU-T V.35 or X.21. These interfaces provide the transmit tifor the user's DTE equipment connected to the interface.

Part numbers for standard and optional equipment for the GT 1030 and GT 2030 appear in Equipment List, Table 1-1. Operating parameters appear in Table 1-2.

FeaturesThe GT 1030 and GT 2030 are customer-side interfaces for an HDSL system. They providefollowing features:

• Configurable as either a Line Terminating Unit (LTU) or a Network Terminating Unit (NT

• Software configurable through an optional ASCII terminal or hardware configurable via on-board switches.

• May be used as a Network Managed Element within a GDC Network Management Syst

• Configurable to support either ITU-T V.35 or X.21 customer interface.

• Provides internal BERT capability.

• Provides Local Loopback and Remote Digital Loopback capabilities.

073R500-000 GDC GT 1030 / GT 2030 1-1Issue 01

System Description Applications

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Applications

Point-to-Point

The GT 1030 and GT 2030 can operate in one of several configurations. Three are shown in Figure 1-2. This application provides bandwidth of Nx64 kbps for N=1 to N=18 for the GT 1030 and to N=32 for the GT 2030. Both units in the HDSL system must be configured for the same da

Point-to-MultiPoint

This application accomplishes E1 provisioning services. Bandwidth at each remote GT 1030supports Nx64 kbps for N=1 up to N=18. The total bandwidth of the combined remote DataCGT 1030s may not exceed N=31. E1 time slot allocation is determined at the 700-G3 side oHDSL system.

Fractional G.704 Service

This application provides for Fractional G.704 service. Bandwidth is N=1 (64 kbps) up to N=(1152 kbps) for the GT 1030 and up to N=32 (2048 kbps) for GT 2030. G.704 time slot allocis left justified for rates up to N=31. If N=32 is desired, the GT 2030 must be configured in UNFRAMED mode.

Figure 1-1 Typical GT1030/2030 Applications

Note Other applications may be found in Chapter 5 of this manual.

GT 2030

HDSL Loop 1

GT 2030HDSL Loop 2

Interface

V.35Nx64 V.35 NX64Point-to-Point

Interface

Point-to-Multipoint

HDSL Loop 1

GT 2030HDSL Loop 2

Interface

G.704Fractional G.704 Interface

2.048Mbps

700-G2or

720-G2

Data-Grooming

HDSL Loop 1

GT 1030

Interface

G.704

Interface

2.048Mbps

700-G3

V.35 NX64

Customer Premises #1V.35 Nx64

HDSL Loop 1

GT 1030Customer Premises #2V.35 Nx64

HDSL Loop 1

GT 1030Customer Premises #2V.35 Nx64

Service

1-2 GDC GT 1030 / GT 2030 073R500-000Issue 01

System Description Diagnostics/Network Management

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Diagnostics/Network ManagementOperation and parameters are controlled by switches mounted on the printed circuit card. Apanel terminal interface jack labeled CONTROL is also provided. This terminal interface enaaccess to a full set of menu-driven diagnostic and configuration controls via a standard terminterface. These include loopback and test pattern control, access to performance monitorinconfiguration control. Instructions for using the terminal feature are in Chapter 2, Installation.

A GT 1030 or GT 2030 standalone unit may be used as part of a Universal Access System (The UAS is a family of network managed metallic loop transmission products. A shelf mounUAS family member is linked by the access loop to a standalone unit located at the far end.network management capabilities are achieved by using a SpectraComm Manager (SCM), inin the UAS shelf, as the interface to an SNMP controller.

073R500-000 GDC GT 1030 / GT 2030 1-3Issue 01

System Description The GT 1030/GT2030 Units

The GT 1030/GT2030 Units

Technical Characteristics

Table 1-1 Equipment List

Description GDC Part No.

GT 1030 - 100 to 240 V ac, 50/60 Hz 073P500-001

GT 2030 - 100 to 240 V ac, 50/60 Hz 073P500-002

Cables

DB-25 Male to V.35 Male (ISO 2593) adapter cable 027H579-005, -015, -025, -050

Cable assembly DB-25M to V.35F adapter cable 027H572-001

Cable assembly DB-25M to DB-15F X.21adapter 027H436-001

Line cable 022H024-001, -002, -005, -010-015, -025, -050

Power Cords (IEC320)

Domestic 830-024-003

Europe 830-061-002

Italy 830-002-008

Japan 830-002-009

Australia 830-002-010

Taiwan 830-002-011

U.K. 830-060-102

Switzerland 830-061-003

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1-4 GDC GT 1030 / GT 2030 073R500-000Issue 01


Table 1-2 Technical Specifications

Local Side

Data Rates 2048 kbps Framing E1 Framed G.704 and E1 Unframed dataInterface 2048 kbps per G.703 and G.704 (-6 dB receiving sensitivity)Data Encoding HDB3 or AMI

Remote Side

Rate Dual duplex 584 Kbaud signaling rate, with 2B1Q line code (each loop)Framing HDSL framing per ETSI ETR, including performance monitoring via the

embedded operation channel (EOC)Interface One or two non-loaded DLL - loopsTransmit Power 13.5 dBm (± 0.5 dB)

Transmission Line

Two metallic twisted-pairs (Loop # 1 and Loop # 2)

Non-loaded DLL type with no loading coils and no additional shielding:up to 3.2 Km at 0.4 mmup to 4.5 Km at 0.5 mm

When Bridged-Taps (BTs) are present, the following rules apply:Maximum number of bridged-taps = 2Maximum tap length = 1000 metersNo loop impairments

Meets performance specification of ETSI ETR 152

Test Features

Local LoopbackRemote LoopbackBER Test

Front panel switch or terminal screen selectable.Front panel switch or terminal screen selectable.Front panel switch or terminal screen selectable.

Dimensions

Height 56 mm (2.2 in.)Width 206 mm (8.1 in.)Depth 163 mm (6.4 in.)Weight 0.7 kg (1.5 lbs.)Shipping Weight 3.6 kg (8.1 lbs.)Temperature 0° to 40°C (32° to 104°F) operating

–40° to 70°C (–40° to 158°F) non-operating

Electrical

Input Power 7 watts at the ac mains

Environmental

Temperature Card Assembly Operation Card Assembly Storage/ Non-Operating

0 to 40 degrees Celsius

-40 to +85 degrees Celsius

Humidity 5 to 90% non-condensingAltitude Operating Non-Operating

0 to 10,000 feet0 to 40,000 feet

073R500-000 GDC GT 1030 / GT 2030 1-5Issue 01


1-6 GDC GT 1030 / GT 2030 073R500-000Issue 01

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Chapter 2: Installation

Overview

This chapter guides you through the process of installing and using the GT 1030 and GT 20your communications network. If this is your first experience using these units you may wisreview Chapter 1 to ensure that you understand the key features and the process of installingusing the unit in your network.

Unpacking and Handling

Inspect the unit for damage; if any is observed, notify the shipper immediately. Save the boxpacking material; you can use it to reship the unit, if necessary.

Installation Requirements

The GT 1030/GT 2030 basecard occupies a standalone enclosure. Place the unit in a ventilawhere the ambient temperature does not exceed 104°F (40°C). Do not install it directly abovequipment that generates a large amount of heat (such as power supplies).

If you need to remove the basecard from the standalone base, disconnect the power supplyconnector from J7 mounted at the rear center of the base card. When you reinstall the compcards to the base, reinstall the connector at J7. See Figure 2-1.

1. Make sure that the unit’s power cord is disconnected.

2. Remove the two screws from the bottom of the unit.

3. Place the unit right side up on a flat surface and carefully remove the top cover.

4. Perform the switch and jumper adjustments.

5. Replace the top cover, positioning it with the grille at the rear, and carefully align the fronpanel so that it fits into the grooves in the top and bottom covers.

6. Replace the two screws in the bottom of the unit.

Important Observe ESD precautions during the procedure. Be sure to wear a properly grounded antistatic wrist strap.

Note The component card and rear panel are fixed to the bottom. The front panel, however, floating.

073R500-000 GDC GT 1030 / GT 2030 2-1Issue 01

Installation Setting Hard Options

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Setting Hard OptionsOption selections match the GT 1030/GT 2030’s functional characteristics with the network which it is installed. The unit’s pc card has three switchbanks for option selection. Normally,settings controlled by the switches can also be performed by means of software (terminal intor SNMP network controller), but there is a hardware switch setting (switch S4-1) to lock ousoftware optioning. Tables 2-1 and 2-2 explain the functions of the switches and Figure 2-1 shows their locations.

You need to make these adjustments only once, when first installing the unit. You don't havrepeat the procedure, unless you change your network or connect a different device to a dachannel.

Note The microprocessor in the GT 1030/2030 only reads the hardware option switch settings duringunit’s power-up sequence. If you change hardware settings while the power is On, you must turpower Off and then On again in order for the new settings to take effect. Software option settingtake effect immediately without need for a power cycle. Software option settings are stored in nvolatile memory, so they do not need to be reset after power interruption.

2-2 GDC GT 1030 / GT 2030 073R500-000 Issue 01

Installation Setting Hard Options

Table 2-1 Switchbank Functions: Option Selection

Switch(es) Label Setting Description

S1-1 - S1-6 CHSEL1 - CHSEL6

These six switches together select the unit’s operating speed. Table 2-2 lists the settings for each available speed.

S1-7 - S1-8 SPARE

S3-1 V54EN/DIS Off V.54 Enabled - unit goes into remote loopback when it receives a V.54 loopback code.

On V.54 Disabled - unit does not respond to V.54 loopback code.

S3-2 RL-EOC Off When front panel RL switch is pushed, unit sends V.54 loopback code inband. Transmission of the code interupts data.

On When front panel RL switch is pushed, unit sends V.54 loopback code inband on the Embedded Operating Channel (EOC). Transmission of the code does not interupt data.

S3-3 CTS-ON Off CTS tracks RTS.

On CTS is On while HDSL operates normally.

S3-4 - S3-8 SPARE

S4-1 SFT/HARD Off Configuration can be changed by means of terminal interface or SNMP control as well as by hardware switches and jumpers.

On Configuration can only be changed by means of hardware switches and jumpers.

S4-2 NTU/LTU Off Unit functions as a Network Terminating Unit (NTU), located on the user side.

On Unit functions as a Line Terminating Unit (LTU), located on the central office side. LTU acts as a master unit in relation to an NTU for timing and supervision.

S4-3 2LP/1LP Off Loops 1 and 2 both enabled; unit is a GT 2030.

On Loop 1 only enabled; unit is a GT 1030.

S4-4 FP-EN/DIS Off Front panel switches enabled.

On Front panel switches disabled.

S4-5 TMG0 On/Offor

Off/Off

Looped - transmit timing locked to receive timing so that far end provides the timing. S4-6 Off configures looped timing with S4-5 in either position.

S4-6 TMG1

On/On External - DTE supplies transmit timing.

Off/On Internal - GT 1030/2030 supplies transmit timing from its own internal oscillator.

S4-7 10MN/DIS Off After being commanded into remote loopback by the far end, the GT 1030/2030 terminates the loopback automatically after 10 minutes if the far end does not terminate sooner.

On No automatic termination of remote loopback.

S4-8 P2P/P2MP Off Unit configured for point-to-point application.

On Unit configured for point-to-multipoint application.

073R500-000 GDC GT 1030 / GT 2030 2-3Issue 01

Installation DTE Interface Selection

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Table 2-2 Operating Speed Selection, Switchbank S1

DTE Interface SelectionThe DB25 back panel connector labeled Business Equipment is jumper-selectable for V.35 ocompatibility. The XP1 jumpers, located adjacent to the connector on the pc board, control tselection.

Place the jumpers on the center and right rows of pins for V.35 operation, or on the center arows for X.21 operation. The positions are labeled.

Data Rate(N x 64 kbps)

S1-6 S1-5 S1-4 S1-3 S1-2 S1-1

32 (2048 kbps) OFF ON ON ON ON ON31 (1984 kbps) ON OFF OFF OFF OFF OFF30 (1920 kbps) ON OFF OFF OFF OFF ON29 (1856 kbps) ON OFF OFF OFF ON OFF28 (1792 kbps) ON OFF OFF OFF ON ON27 (1728 kbps) ON OFF OFF ON OFF OFF26 (1664 kbps) ON OFF OFF ON OFF ON25 (1600 kbps) ON OFF OFF ON ON OFF24 (1536 kbps) ON OFF OFF ON ON ON23 (1472 kbps) ON OFF ON OFF OFF OFF22 (1408 kbps) ON OFF ON OFF OFF ON21 (1344 kbps) ON OFF ON OFF ON OFF20 (1280 kbps) ON OFF ON OFF ON ON19 (1216 kbps) ON OFF ON ON OFF OFF18 (1152 kbps) ON OFF ON ON OFF ON17 (1088 kbps) ON OFF ON ON ON OFF16 (1024 kbps) ON OFF ON ON ON ON15 (960 kbps) ON ON OFF OFF OFF OFF14 (896 kbps) ON ON OFF OFF OFF ON13 (832 kbps) ON ON OFF OFF ON OFF12 (768 kbps) ON ON OFF OFF ON ON11 (704 kbps) ON ON OFF ON OFF OFF10 (640 kbps) ON ON OFF ON OFF ON9 (576 kbps) ON ON OFF ON ON OFF8 (512 kbps) ON ON OFF ON ON ON7 (448 kbps) ON ON ON OFF OFF OFF6 (384 kbps) ON ON ON OFF OFF ON5 (320 kbps) ON ON ON OFF ON OFF4 (256 kbps) ON ON ON OFF ON ON3 (192 kbps) ON ON ON ON OFF OFF2 (128 kbps) ON ON ON ON OFF ON1 (64 kbps) ON ON ON ON ON OFF

2-4 GDC GT 1030 / GT 2030 073R500-000 Issue 01

Installation Electrical Connections

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Figure 2-1 PC Board: Options and Connectors

Electrical Connections

The following paragraphs describe the power and line connections to the GT 1030/2030.

Power

Attach the appropriate power cord to the rear panel IEC 320 connector and to the wall recepThe unit should be powered by the same ac source as the equipment interfaced with the unprevent large circulating currents caused by differences in ground potential. If you cannot detewhether the equipment is powered by the same ac source, verify that a potential difference than 0.25 V rms exists between the grounding circuits of the respective power outlets.

Business Equipment Connections

The rear panel universal DTE DB-25 connector, labeled Business Equipment (see Figure 2-2), supports either X.21 or V.35 interface connection as selected by the X5 jumpers. The connepinouts for the two applications are detailed below in the table below

Note Before you power up the unit, refer to the Preoperational Hard/Soft Configuration Setup later in chapter.

SFT/HARDNTU/LTU2LP/1LPFP-EN/DISTMG0TMG110MN/DISP2P/P2MP

V54EN/DISRL-EOCCTS-ONSPARESPARESPARESPARESPARE

S1 S3 S4

Option Switchbanks S1, S3, and S4

Function Callouts for Option Switchbanks S1, S3, and S4

X5X.21 V.35

CHSEL1CHSEL2CHSEL3CHSEL4CHSEL5CHSEL6SPARESPARE

S1

S3

S4

X5 Jumpers for V.35/X.21

Interface Selection

Line ConnectorPower Connector

DTE Connector: DB25

073R500-000 GDC GT 1030 / GT 2030 2-5Issue 01

Installation Electrical Connections

Table 2-3 Business Equipment (DTE) Interface Signals (ITU-T V.35)

Table 2-4 Business Equipment (DTE) Interface Signals (X.21)

J1(DB-25)

Pin(See Note 1)

V.35(ISO 2593)

Pin(See Note 2)

ITU-T(See Note 3) NTU Signal Description

1 A 101 No Connection

7 B 102 Signal ground Establishes a common ground reference for all interface circuits.

4 C 105 RS Request-to-send Indicates to GT 1030/2030 that DTE is prepared to transmit.

5 D 106 CS Clear-to-send Indicates to DTE that GT 1030/2030 is prepared to transmit.

6 E 107 DM Data Set Ready Indicates to DTE that GT 1030/2030 is operation-al.

8 F 109 CO Received line signal detector (Carrier On)

Indicates to DTE that GT 1030/2030 is receiving data (not idle or OOS codes).

25 NN 142 TM Test mode Indicates to DTE that GT 1030/2030 is in a test mode.

214

PS

103103

SD-ASD-B

Transmitted data Transfers data signals from DTE to GT 1030/2030 for transmission over communications line.

316

RT

104104

RD-ARD-B

Received data Transfers data signals received over communication line by GT 1030/2030 to DTE.

179

VX

115115

RT-ART-B

Receiver timing Transfers receiver signal timing information from GT 1030/2030 to DTE.

1512

YAA/a

114114

ST-AST-B

Transmitter timing Transfers transmitter signal timing information from GT 1030/2030 to DTE.

20 H 108/2 TR Data Terminal Ready

Indicates to GT 1030/2030 that DTE is prepared for data communication.

Note 1: Unlisted DB-25 pins are not usedNote 2: V.35 interface requires use of adapter cable 027H579 or 027H572Note 3: ITU-T designations are shown for reference only.

J1DB-25

Pin15-Pin X.21 Connector*

ITU-T CircuitDesignation Signal Description

214

29

T(A)T(B)

Transmitted data Data from DTE.

316

411

R(A)R(B)

Received data Data to DTE.

420

310

C(A)C(B)

Control Indicates to GT 1030/2030 that DTE is prepared to transmit.

56

512

I(A)I(B)

Indication Indicates to DTE that GT 1030/2030 is receiving data.

1512

613

S(A)S(B)

Signal element timing

Transmit and receive signal timing information from GT 1030/2030 to DTE.

7 8 G Ground Common electrical reference

* DB25 to DB15 adapter cable, part # 027H448-005, -010, or -025 needed for X.21 compatibility.

2-6 GDC GT 1030 / GT 2030 073R500-000 Issue 01

Installation Preoperational Configuration Setup

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HDSL Line Connections

You make HDSL line connections to the GT 1030/2030 standalone using the Line connector rear panel. Refer to Figure 2-2.

Figure 2-2 Rear Panel

Preoperational Configuration Setup

Hard

Configure the unit as follows:

1. Set the switches according to Tables 2-1 and 2-2. Verify LTU/NTU configuration. If S4-1 is placed in the SOFT configuration position, all other switch settings are ignored, and the must be configured via the optional terminal screen. Refer to Setup (Soft).

2. Connect the DTE interface and HDSL loops to the rear panel connectors.

3. Apply power to the unit.

4. The card automatically performs internal self-tests. If one of these tests fails, the front pALM LED blinks.

5. Follow step 5 under Setup (Soft).

BUSINESS EQUIPMENTHDSL

AC POWER

IEC 320 AC Power Entry

DB-25 Business Equipment connector requires, depending on X5 jumper setting, either

DB-25 to ISO 2593 V.35 Connector Adapter Cable or

DB-25 to ISO 4903 X.21 DB-15 Connector Adapter Cable

CONTROL

8-Pin Modular Jacks, Keyed

LINE

073R500-000 GDC GT 1030 / GT 2030 2-7Issue 01

Installation Preoperational Configuration Setup

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Soft

1. Follow steps 1 through 5 above.

2. Connect a terminal to the CONTROL connector on the back panel.

3. To view the test results on the terminal, go to the View H/S Config Screen on the terminal. Refer to Chapter 3 paragraph - "Setting Soft Options.".

4. After performing the self-tests, the HDSL loops (LTU and NTU) initiate start-up, and the green LEDs should blink. The start-up should last less than three minutes. When compleNORM LEDs should be ON and the ES LEDs should be OFF. If not, the start-up failed. card automatically initiates a new start-up procedure. During this time, the ALM LED wilblink until the LOOP status indicators clear.

5. Data transfer should occur, DTE indicators RD and SD should be ON. The NORM LED should be ON, and the ES LED should be OFF. If not, refer to the troubleshooting procedChapter 4.

Table 2-5 HDSL Connector Pin Assignments

Table 2-6 Terminal Block TB1 for HDSL Connection, Pin Assignments

Table 2-7 Control Line Connector, Pin Assignments

Pin No. Function Description

1 HDSL-LP2-RING Loop 2 Ring (GT 2030 only) 2 HDSL-LP2-TIP Loop 2 Tip (GT 2030 only)

3 No Connection4 HDSL-LP1-RING Loop 1 Ring 5 HDSL-LP1-TIP Loop 1 Tip

6, 7, 8 No Connection


1 HDSL-LP1-TIP Loop 1 Tip 2 HDSL-LP1-RING Loop 1 Ring

3 HDSL-LP2-TIP Loop 2 Tip (GT 2030 only) 4 HDSL-LP2-RING Loop 2 Ring (GT 2030 only)


1, 3, 7, 8 No connection 2 DCD Data Carrier Detect - constant On

4 Ground 5 RXD Receive Data - from unit to terminal6 TXD Transmit Data - from terminal to unit

2-8 GDC GT 1030 / GT 2030 073R500-000 Issue 01

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Chapter 3: Operation

Overview

Figure 3-1 illustrates the GT 1030/GT 2030 front panel and explains the function of each conand indicator. You may check the operation of the unit by monitoring the front panel indicatorusing the test procedures provided in Chapter 4. Unit configurations for typical applications are provided in Chapter 5.

Once the options are set and the communication line properly connected, the units need noadditional operator commands. The units are transparent to your network and communicateautomatically with each other and with your connected network devices.

Front Panel Description

Table 3-1 describes the front-panel LED indicators and push buttons. Red LEDs indicate criticmajor failures and errors. Green LEDs indicate satisfactory operation or completion of a pro

Table 3-1 Front Panel

Label LED Color Function

ON Green Lit while +5V is applied to the unit

LOOP ES Red Errored Second - indicates loop status in conjunction with the NORM indicator; see Table 3-2 for interpretation. GT 2030 has two sets of these indicators, labeled Loop 1

and Loop 2.

LOOP NORM Green Normal Operation - indicates loop status in conjunction with the ES indicator; see Table3-2 for interpretation. GT 2030 has two sets of these indicators, labeled Loop 1 and

Loop 2.

DTE SD Green Send Data - indicates presence of transmit data at the DTE interface

DTE RD Green Receive Data - indicates presence of received data at the DTE interface

ALM Red Lights to indicate the presence of a major alarm. Blinks to indicate failure during self-test. Also blinks to indicate detection of LOS, LOSW, or UAS on an HDSL loop.

TM Red Test Mode - lit during any loopback and/or self-test

LL Red Local Loopback, indicator and push button. Indicator is lit during Local Loopback test mode, whether initiated by the pushbutton or by software control. TM is also lit when this

indicator is On.

ST Red Self Test, indicator and push button. Pushing the ST button activates a 215 pseudo-

random test pattern and enables detection of an incoming 215 pattern. Indicator is lit during self test mode, whether initiated by the pushbutton or by software control. TM is

also lit when this indicator is On.

RL Red Remote Loopback, indicator and push button. Indicator is lit during Remote Loopbacktest mode, whether initiated by the pushbutton or by software control. For this loopbackto be functional, the unit must be configured as a LTU or V.54 inband signaling must be

enabled. TM is also lit when this indicator is On.

073R500-000 GDC GT 1030 / GT 2030 3-1Issue 01

Operation Soft Option Selection

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The Loop and DTE data path indicators enable visual monitoring of the HDSL Loop 1 input,HDSL Loop 2 input (GT 2030 only), and the DTE Interface.

The status of each HDSL loop is represented by two indicators:

• NORM - system status.

• ES - transport status.

Each of those LEDs can be in one of three states: ON, blinking (at a 2 Hz rate), or OFF. Table 3-2 summarizes how to interpret the loop indicators.

Table 3-2 Loop Status Indicators

Figure 3-1 Front Panels

Soft Option Selection

You can use an optional terminal (a standard ASCII terminal equipped with an EIA/TIA-232communication interface) connected to the CONTROL interface on the back panel for configuration and control of the unit.

Loop Indicators

ES NORM Indicates...

OFF ON Normal operation

ON OFF LOS/LOSW - Loss of input signal/Loss of synchronization word on loop

ON (for .5 sec.) ON ES - Errored second

ON Blink Start-up tests, No response from mating unit

OFF Blink Start-up in progress

TM LL ST RLDTE

SD

LOOPON


ALM

RD

ES

NORM

TM LL ST RLDTE

SD

LOOPON


ALM

RD

ES

NORM

1 2

3-2 GDC GT 1030 / GT 2030 073R500-000 Issue 01

Operation Startup Procedure

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Terminal Requirements

The software necessary to run the supervision program for a GT 1030 or GT 2030 unit is conin the unit itself. You can use any standard ASCII terminal (VT100 or ANSI terminal, or perscomputer emulating an ASCII terminal) equipped with an EIA/TIA-232-E communication interface to control operation. The following screens were derived by plugging the COMM poa PC (using Microsoft Windows™ terminal emulator program) into the back panel CONTROjack. Set the terminal communications parameters as follows:

• Data Rate = 9600 bps

• Character Format = 1 start bit, 8 data bits, no parity, one 1 stop bit

Control Port Characteristics

The control port has an EIA/TIA-232-E asynchronous DCE interface, terminated in an RJ-45connector on the back panel designated CONTROL. The connector is wired as shown belo

Startup Procedure

A management session starts automatically as soon as the terminal cable is connected to thCONTROL port of an operating unit. To end an ongoing management session, disconnect tterminal from the unit. Upon power-up, the unit sends the opening screen, showed in Figure 3-2, followed by the main menu.

Figure 3-2 Opening Screen

Pin Function1, 2, 3 Not connected4 Ground5 Transmit output (RXD of terminal)6 Receive input (TXD of terminal)7, 8 Shorted internally

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073R500-000 GDC GT 1030 / GT 2030 3-3Issue 01

Operation Screen Organization

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Screen Organization

The screen includes the areas described in Table 3-3.

Table 3-3 Terminal Screen Organization

Operating Procedures

The following procedures apply to all the operations that you perform on the optional termin

Menu Selection

You can select a Menu item in two ways:

1. Move the selected block to the desired item by means of the arrows, then press the Ent

2. Type the number appearing to the side of the menu item.

Either action opens the sub menu or dialog box used to perform the selected operation.

Field Navigation

To move forward among the fields of a dialog box, press the Down arrow key. To move backpress the Up arrow key.

Field Editing

You can modify the values displayed in the screen fields as follows:

1. Bring the cursor to the desired field, and then press Enter to display an option menu witavailable values.

2. Highlight the desired value then press Enter to select the new value and close the option

Header Located at the top of the screen, the header displays GDC name and equipment model, followed by the current operating mode (LTU or NTU).

Status Line Located below the header, the status line includes two main fields, which display the status of the various alarms and status signals. An active alarm and status indicators are displayed in reverse

video.

DTE Field Includes the following indications:TM, DCD, DTR, RTS, DSR

Loop Alarms Field

Loop alarms field is divided into several sub fields, one for each loop and includes the following indications:

LOS - Loss of input signal on the corresponding loop.UAS - Unavailable seconds threshold for the corresponding loop is being exceeded.

LOSW - Loss of synchronization word on the corresponding loop.

Work Area Displays the menu and dialog boxes.

Active Keys Area

The active keys are constantly updated to show the keys and key combinations you can use on the current screen.

3-4 GDC GT 1030 / GT 2030 073R500-000 Issue 01

Operation Main Menu

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Restoring Default Values

When the unit stores default values for parameters displayed in a dialog box, you can replacurrent values with the default values by pressing Ctrl D (Ctrl D means hold down the Ctrl (cokey and press D).

Saving Values

To save new parameter values entered in dialog boxes, press Ctrl W. These parameters arin non-volatile memory for use upon the next unit power-up in SOFT Config mode (Switch isto SOFT).

Quitting Without Saving

To quit without saving the new parameter values entered in a dialog box, press Esc.. You capress Esc as necessary to close any open submenus and to return to the main menu.

Refresh

You may refresh the screen at any time by typing Ctrl-R.

Main Menu

The Main Menu is displayed in Figure 3-3. The menu includes four options, described in the following paragraphs.

Figure 3-3 Main Menu

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073R500-000 GDC GT 1030 / GT 2030 3-5Issue 01

Operation Main Menu

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Diagnostics Option

Use this option to display diagnostic information and to activate or control diagnostic functionfollows:

• Display of performance statistics collected on each of the HDSL loops.

• Display HDSL loop status information, technical data on loop performance, HDSL loop nmargins, optional gain settings, etc.

Configuration Option

Use this option to configure the data interface and HDSL loop parameters, as follows:

• Modify the HDSL loop operating mode (NTU or LTU), number of loops enabled, and application type (point-to-point, point-to-multipoint), and front panel enable.

• Display and modify the interface configuration, TX Clock mode, CTS mode, V.54 and RLpushbutton options, and Data Rate.

• Display system hardware and software data, and self-test results.

Maintenance Option

Use this option to perform maintenance activities, as follows:

• Enable both local and remote system loopbacks.

• Test system performance using the internal BER meter.

• Reset the statistics counters.

• Reset the unit. (Simulate a power-up.)

These screens are described in Chapter 4 under Maintenance Menu.

3-6 GDC GT 1030 / GT 2030 073R500-000 Issue 01

Operation Diagnostic Menu

ic

Diagnostic MenuYou can use the diagnostic menu to display diagnostic information, and to activate diagnostfunctions. See Figure 3-4 . To open the diagnostics menu, select item 1 on the main menu.

Figure 3-4 Diagnostic Menu

The functions available from the diagnostic menu are as follows:

• HDSL Monitoring

• HDSL View

HDSL Monitoring

The HDSL Monitoring screen, Figure 3-5, displays 24-hour performance statistics on the HDSLloops. To display the HDSL monitoring screen, select item 1 on the diagnostic menu.

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073R500-000 GDC GT 1030 / GT 2030 3-7Issue 01


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Figure 3-5 HDSL Monitoring Screen

The screen includes the fields described in Table 3-4.

Table 3-4 HDSL Monitoring Screen

To select another loop, type its number: 1 or 2.

After viewing the data collected for the selected loop in the current 15-minute interval, you cdisplay the other 95 intervals within the current 24-hour interval by pressing any key, excep3, R, and Esc keys. The display is cyclic, that is, the current interval is displayed again after thinterval.

Interval Time Displays the elapsed time in seconds from the beginning of the current 15-minute interval. The range is 0 to 900.

ES Displays the number of errored seconds in the current 15-minute interval.

Last 24 Hr ES Displays the number of errored seconds in the last 24-hour interval.

UAS - Displays the number of unavailable seconds in the current 15-minute interval.

Last 24 Hr UAS Displays the number of unavailable seconds in the last 24-hour interval.

SES Displays the number of severely errored seconds in the current 15-minute interval.

Last 24 Hr SES Displays the number of severely errored seconds in the last 24-hour interval.

FEBE Displays the number of Far-End-Block-Errors reported by the remote equipment in the current 15-minute interval.

Last 24 Hr FEBE Displays the number of Far-End-Block-Errors reported in the last 24-hour interval.

Note Powering up the GT 1030 or GT 2030 unit resets the 24 hour performance statistics on the HDSloops.

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3-8 GDC GT 1030 / GT 2030 073R500-000 Issue 01


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To reset the HDSL statistics counters, type R. All the displayed values are reset to 0. To exit anreturn to the Diagnostics menu, press the Esc.

HDSL Status

The option displays the HDSL Status screen, which shows you diagnostic information and tecdata on HDSL loop performance. A typical screen is shown in Figure 3-6.

Figure 3-6 HDSL Status Screen

Table 3-5 describes the fields on the HDSL Status screen.

Table 3-5 HDSL Status Screen Fields

Loops Exchange Indicates whether the HDSL loops carrying the data traffic are correctly connected or have been interchanged by error. This information is available

only when the unit connected in a link can exchange information with the remote unit. Not applicable if unit is configured as an LTU.

Loop 1 TIP/RING Reversal Indicates whether the two conductors of HDSL loop 1 are correctly connected or have been interchanged by error. This information is available only when the unit connected in a link can exchange information with the remote unit.

Not applicable if unit is configured as an LTU.

Loop 2 TIP/RING Reversal Indicates whether the two conductors of HDSL loop 2 are correctly connected or have been interchanged by error. This information is available only when the unit connected in a link can exchange information with the remote unit.

Not applicable if unit is configured as an LTU.

Local Unit CLEI/Serial # For future use.

Remote Unit CLEI/Serial # For future use.

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073R500-000 GDC GT 1030 / GT 2030 3-9Issue 01

Operation Configuration Menu

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Operation

To display the HDSL Status screen, select item 2 on the Diagnostics menu. After viewing thepress Esc to exit and return to the Diagnostic menu.

Configuration Menu

Use the Configuration menu to configure the data interface and the HDSL loop parameters.

To open the Configuration menu, select item 2 on the Main Menu. Figure 3-7 depicts the Configuration menu.

Figure 3-7 Configuration Menu

The functions available from the Configuration menu are as follows:

• Unit Config.

• Interface Config.

• View H/S Config.

Noise Margin Displays amount of additional noise in dB which can be tolerated before

exceeding 5X10 -8 bit error ratio. Separate values are provided for each HDSL loop.

Pulse Attenuation Displays the pulse attenuation, in dB, measured by the signal processing circuits of the unit. Separate values are provided for each HDSL loop for the

local unit.

Gain Should Be Indicates the optimal receiver gain value that should be set. This value is calculated by the signal processing circuitry of the unit.

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3-10 GDC GT 1030 / GT 2030 073R500-000 Issue 01


HDSL

Unit Configuration Screen

The Unit Configuration option displays the Unit Configuration screen, showing the HDSL configuration parameters of the unit. A typical screen is shown in Figure 3-8.

Figure 3-8 Unit Configuration Screen

The screen includes three fields that are used to select the operating mode of the unit on theloops side, and the network application:

• Unit Type

• Enabled Loops

• Application

• Front Panel Enable

• Maj Alm Thres

• Min Alm Thres

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073R500-000 GDC GT 1030 / GT 2030 3-11Issue 01


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Operation

1. To display the Unit Configuration screen, select item 1 on the Configuration menu.

2. To change the current value of Unit Type parameter, press Enter. This displays an optionwith the available options:

• LTU

• NTU

3. Highlight the desired option and press Enter. The option menu closes and the new selecappears in the screen.

4. The Enabled Loops Field may be edited for the GT 2030 but is fixed at 1 for the GT 103

5. The Front Panel Enable field determines whether the front panel switches are enabled odisabled.

6. Highlight the desired option and press Enter. The option menu closes and the new selecappears on the screen.

7. After making the desired change, press Ctrl W to save the change in the unit. To quit ancancel changes made in this screen, press the Esc key without pressing Ctrl W.

8. To exit and return to the configuration menu, press the Esc.

Point-to-Point (P2P) Options

When the GT 2030 is used in a P2P configuration, any of the three DTE timing options (EXTERNAL, INTERNAL, LOOPED) found in the Interface Config. Screen under TX Clock Mode are available. Usually, when the GT 2030 is configured as an NTU, either the EXTERor LOOPED configuration is used. In this case, the LTU typically is either a 700-G2 or 720-G2its E1 Interface Conf. Frame Mode set up for FRAMED. The LTUs E1 DS0s are recombineda user selectable aggregate data rate (V.35 or X.21) by the GT 2030. For increasing GT 20aggregate rates, the GT 2030 data is sourced from the E1 DS0s in an increasing order, i.e.,kbps is sourced from E1 DS0 1, 2x64 kbps is sourced from E1 DS0s 1 and 2, 3x64 kbps is sfrom E1 DS0s 1, 2, and 3, etc. Time slot routing over the HDSL loops follows that shown in Table 3A. A maximum aggregate rate of 31x64 kbps is available from the GT 2030 NTU in this cas

The following two examples illustrate E1 P2P Timeslot Routing:

Routed E1 timeslots over HDSL loops with 700-G2 Interface Config. TS16 set for DATA

Routed E1 timeslots over HDSL loops with 700-G2 Interface Config. TS16 set for SIGNAL

Loop 1 0 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31Loop 2 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 f

f = all ones filled

Loop 1 0 1 3 5 7 9 11 13 15 16 18 20 22 24 26 28 30Loop 2 0 2 4 6 8 10 12 14 16 17 19 21 23 25 27 29 31

f = all ones filled

3-12 GDC GT 1030 / GT 2030 073R500-000 Issue 01


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With two loops enabled in P2P mode, and a 700-G2 LTU with its E1 Interface Config. Frame Mset for UNFRAMED, an aggregate signal of 2048 kbps may be provisioned. Here, the GT 2remote (V.35 or X.21) will have its Tx Clock Mode set for EXTERNAL or LOOPED timing. Additionally, with GT 2030 units as both LTU and NTU, an aggregate nx64 kbps signal up to kbps may be provisioned. In this case, the GT 2030 LTU’s Tx Clock Mode is set for INTERNtiming, and the GT 2030 NTU's Tx Clock Mode is set for EXTERNAL or LOOPED timing.

With only one loop enabled in P2P mode, and a 700-G2 or 720-G2 LTU with its E1 InterfaceConfig. Frame Mode set for FRAMED, a fractional E1 service may be provided to the remotvia the GT 1030 or GT 2030 NTU. The E1 DS0's are routed over the HDSL loops in a contigblock as shown in Table 3A, and are recombined by the GT 1030 or GT 2030 into an aggregate kbps signal. Up to 18x64 kbps may be provisioned via the GT 1030 or GT 2030 in this caseAdditionally, with GT 1030 or GT 2030 units as both LTU and NTU, an aggregate nx64 kbps sup to 18x64 kbps may be provisioned in this single HDSL loop configuration. In this case, th1030 or GT 2030 LTU's Tx Clock Mode is set for INTERNAL timing, and the GT 1030 or GT 2NTU's Tx Clock Mode is set for EXTERNAL or LOOPED timing.

Point-to-MultiPoint Options

With the 700-G2 or 700-G3 used as a LTU in a P2MP configuration, and with GT 1030 unitsremotes (NTU), E1 payload is distributed along the HDSL loops in contiguous blocks of DS0sthe selected blocks of DS0s recombined at the NTUs into an aggregate nx64 kbps signal (VX.21). In this case, the GT 1030 NTU's Tx Clock Mode must be set for LOOPED timing. Up18x64 kbps can be routed to each remote, with the exception that the total data rate of all thremote sites must be less than or equal to 31x64 kbps. A typical configuration for E1 P2MP timrouting is shown below:

If the Network Configuration Options are set for:

ApplicationP2MP

Loop1 2 3

Start DS01 11 20

Consecutive DS0's1098

The resulting timeslot routing over the HDSL loops is:

Routed E1 timeslots over HDSL loops with Interface Config. TS16 set for SIGNALING

Remote 1 1 2 3 4 5 6 7 8 9 10 recombined into a 10x64 kbps = 640 kbps V.35, EIA-530, or X21 signal

Remote 2 11 12 13 14 15 16 17 18 19recombined into a 9x64 kbps = 576 kbps V.35, EIA-530, or X21 signal

Remote 3 20 21 22 23 24 25 26 27recombined into a 8x64 kbps = 512 kbps V.35, EIA-530, or X21 signal

073R500-000 GDC GT 1030 / GT 2030 3-13Issue 01

Operation Interface Configuration Screen

the

Interface Configuration Screen The Interface Configuration option displays the DCE Interface Configuration parameters of unit. A typical screen is shown in Figure 3-9.

Figure 3-9 Interface Configuration Screen

The screen includes the following fields described in Table 3-6.

Table 3-6 Interface Configuration Screen

TX Clock Mode Displays the DCE interface transmit timing selection:Looped - The transmit clock is locked to the receive clock and is developed from the

incoming remote end timing.External - The DCE interface uses an external clock provided by the customer's DTE.Internal - The transmit clock is derived from the internal clock oscillator of the HDSL

module.CTS Mode ON: CTS is on as long as the HDSL module is powered and operating normally.

ON with RTS: The CTS line tracks the state of the RTS line.V54 Rx Mode Enabled: The unit detects and responds to inband V54 protocol.

Disabled: The unit does not respond to inband V54 protocol.FP RL Mode V54: Pressing the front panel RL button initiates the V54 protocol toward the HDSL side

of the unit.EOC: Pressing the front panel RL button causes the unit to send a loopback command to

the remote HDSL unit.Data Rate Press the space bar to increment the data rate, press the minus key to decrement the

data rate. Select from N=1 to N=18 for the GT 1030 or N=1 to N=32 for the GT 2030.

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3-14 GDC GT 1030 / GT 2030 073R500-000 Issue 01

Operation Interface Configuration Screen

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Operation

To display the interface configuration screen, select item 2 on the configuration menu.

To change the current value of a parameter, use the following procedure:

1. Move the selection block to the desired line and press Enter. An option menu appears wavailable options.

2. Highlight the desired option, and press Enter. The option menu closes, and the new seleappears in the corresponding line.

3. To reset the selected parameters to the default values, press Ctrl D.

4. To save changes, press Ctrl W.

5. To quit and cancel the changes made in this screen, press Esc.

6. To exit and return to the Configuration menu, press the Esc.

View H/S Configuration

The View H/S Configuration option displays the Configuration and Selftest Results screen, showing hardware and software configuration data and the results of the last power-up self-teinformation displayed on this screen is intended for maintenance and technical support groutypical screen is shown in Figure 3-10.

Figure 3-10 View H/S Configuration Screen

The upper area of the screen presents configuration data. The lower area presents the resulast power-on self-test. Table 3-6 describes the fields in the screen.

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073R500-000 GDC GT 1030 / GT 2030 3-15Issue 01

Operation Maintenance Menu

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Table 3-7 Configuration and Selftest Results Screen Fields

The last power-on self-test results area lists each subsystem tested during the self-test, andresult: Pass or Fail.

Maintenance Menu

You may refer to Chapter 4 to perform maintenance and troubleshooting.

Network Management

GT 1030s and GT 2030s can be used as Network Managed elements when used within a GNetwork Management System. The management software conforms to the MIB (ManagemeInformation Base) II standards set out for SNMP Version 1.0. Refer to the related SCM ManCard publication listed in the Preface.

MIB Tables

This section consists of tables that list and describe the MIB objects by which an SNMP netmanager can configure, control, and monitor a GT 1030 or GT 2030. Each table is arrangedcolumns:

• MIB Object- name

• Syntax- MIB variable type

• Access- read-write, read-only, or write-only

• Enumeration- interpretation of specific possible values, or range of possible values

• Description - function of the MIB object

The way MIB objects appear on the screen and how they are manipulated varies dependingnetwork manager or MIB browser being used. The information in these tables is therefore intfor use in conjunction with the operating instructions for manager or browser.

Software Version Displays the software version of the unit.Number of Loops Displays the number of HDSL loops of the unit.

Checksum Firmware checksum.Config Mode Displays the current configuration mode of the unit:

Soft - The unit is configured under software control.Hard - The unit is configured by means of the internal dip

switches and jumpers.

Note Many SNMP network managers and MIB browsers automatically perform a Get operatimmediately following a Set to an object that permits read-write access. In that way thesuccess of the write operation is confirmed. If your manager or browser does not perfothis function automatically, it is highly advisable that you command a Get for each objeyou Set.

3-16 GDC GT 1030 / GT 2030 073R500-000 Issue 01

Operation Network Management

Table 3-8 Version Group Table

MIB Object Syntax Access Enumeration Description

System MIB Version

Display String Read-only Identifies the version of the MIB. The format of the version is x = yzT, where "x" identifies the

major revision number, "y" identifies the typographical revision, and "T" identifies the

test revision. (not on formal release)Acceptable values for the individual revision

components are:x: 1 - 9y: 0 - 9z: 0 - 9T: A - Z

Version Index SC instance Read-only The index value that uniquely identifies the interface to which this entry is applicable.

SC instance defines the slot, line, drop, and sub-identifier. The table describes the maintenance objects for the unit and

references the unit interface..Firmware

LevelDisplay String Read-only The version number of the firmware. This

allows the products to know which revision is installed. The released version number is

sequenced from , A_,...AA,...ZZ. Test versions are numerical from 01 to 99.

Model Number Display String Read-only This variable is used to determine the type of card family installed .

073R500-000 GDC GT 1030 / GT 2030 3-17Issue 01


.

t

Table 3-9 Maintenance Table


Maintenance Line Index

SC instance Read-only The index value that uniquely identifies the interface to which this entry is applicable.

SC instance defines the slot, line, drop, and sub-identifier. The table describes the maintenance objects for the unit and

references the unit interface..Soft Reset SC instance Read-write Reset (1)

Norm (2)Supports the action of soft resetting the unit.

When this object is set to reset, the unit performs a soft reset to the managed unit.

Norm cannot be set by management.

Config Mode Integer Read-only Software (1)Hardware (2)

The hardware configuration mode of the unitA unit may be hardware or software

configured.System Up

TimeTime Ticks Read-only This variable is used to report the elapsed

system tick time.Unit Type Integer Read-write LTU (1)

NTU (2)This variable is used to define HDSL type.

LTU selects line terminating unit, NTU selectsnetwork terminating unit. For 700-G2/G3, this

variable can only be a LTU.

Default Initiate Integer Read-write Default (1)Normal(2)

Used to allow the non volatile configuration tobe set to a factory default reset. Normal

cannot be set by management.Data Type Integer Read-write Data (2)

Voice (1)Defines the HDSL data type, either data or

voice.Loop Provision Integer Read-write Point-to-point

(1)Point-to-

MultiPoint (2)

This variable is used to define the HDSL loopprovision. When P-P is selected, the unit is

connected to another HDSL unit. When P-MPis selected, the unit is connected to more than

one HDSL units or data grooming.Number of

LoopsEnabled

Integer Read-write One Loop (1)Two Loops (2)

Used to define the HDSL loop configuration. Ican be set for one to two loops.

Front Panel Integer Read-write Inhibit (1)Enable (2)

Enables or inhibits the front panel operation.

3-18 GDC GT 1030 / GT 2030 073R500-000 Issue 01


Table 3-8 Maintenance Table (Cont.)


Data Type Integer Read-write Data (2)Voice (1)

Defines the HDSL data type, either data or voice.

Loop Provision Integer Read-write Point-to-point (1)Point-to-MultiPoint

(2)

This variable is used to define the HDSL loop provision. When P-P is selected, the unit is

connected to another HDSL unit. When P-MP is selected, the unit is connected to more than one

HDSL units or data grooming.

Number of Loops Enabled

Integer Read-write One Loop (1)Two Loops (2)

Used to define the HDSL loop configuration. It can be set for one to two loops.

Front Panel Integer Read-write Inhibit (1)Enable (2)

Enables or inhibits the front panel operation.

Private Storage 1

Display String Read-write (Size (16)) This variable is used for general purpose storage.

Private Storage 2


Private Storage 3


LED Status Octet String Read-only Octet 1 Bit 7 - not usedBit 6 - EIA RDBit 5 - EIA COBit 4 - EIA RS

Bit 3 - NORM E1Bit 2 - ES E1

Bit 1 - ALBit 0 - TM

Octet 2 Bit 7 - not usedBit 6 - EIA SDBit 5 - not usedBit 4 - not used

Bit 3 - NORM L2Bit 2 - ES L2

Bit 1 - NORM L1Bit 0 - ES L1

Octet 3 Bit 7 - not usedBit 6 - not used

Bit 5 - STBit 4 - RLBit 3 - LL

Bit 2 - not usedBit 1 - not usedBit 0 - not used

Returns a bitwise snapshot of the front panel LED status.

073R500-000 GDC GT 1030 / GT 2030 3-19Issue 01


Table 3-10 DTE Configuration Table

Table 3-11 HDSL Diagnostic Table


DTE Config Index

SC instance Read-only The index value that uniquely identifies the interface to which this entry is

applicable. SC instance defines the slot, line, drop.

DTE CTS Mode Integer Read-write Forced ON (1)ON With RTS (2)

Controls the function of CTS.

DTE Data Rate Integer Read-write (1..32) This variable represents the DTE data rate in 64 K increments.

DTE TX Clock Source

Integer Read-write External Timing (1)Internal Timing (2)

Loop Timing (3)

External timing indicates that recovered receive clock from another interface is

used as the transmit clock.Internal indicates that a local clock

source is used.Loop Timing indicates that the recovered

receive clock is used as the transmit clock.


Diagnostic Index SC instance Read-only The index value that uniquely identifies the interface to which this entry is

applicable. SC instance defines the slot, line, drop. and sub-identifier, which is in

this case, a network interface.

Loopback Integer Read-write No Loopback (1)Line Loop (2)Local Loop (3)

Line and Local Loop (4)

Supports the action of a diagnostic loop at the point indicated.

BER Test Integer Read-write Inhibit (1)Enable (2)

Supports the action of bit error rate test. When set to inhibit, no BERT test is in progress. When set to enable, BERT is

in progress.

3-20 GDC GT 1030 / GT 2030 073R500-000 Issue 01


Table 3-12 HDSL Diagnostic Results Table


Diagnostic Results Index

SC instance Read-only The index value that uniquely identifies the interface to which this entry is applicable. SC instance defines the slot, line, drop. and sub-

identifier, which is in this case, a network interface.

Test Execution Status

Integer Read-only In Sync (1)Not In Sync (2)

The current execution status of the diagnostic test. When set to In Sync, BERT test is in sync

and BER rate is valid. When set in NOT IN Sync, BERT test is not in sync, and BER rate

is not valid.

Integer Read-only (0..65535) The results of the last diagnostic test. This can be the current test running or the last

completed test.Note that the interpretation of these test

results may be affected by the value of the Test Execution Status object.

Diagnostic Result Interval

Integer Read-only (0..65535) This variable represents the BER test intervals. A time interval is defined as the time

required for transmission of a block of bits.

073R500-000 GDC GT 1030 / GT 2030 3-21Issue 01


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Table 3-13 HDSL Performance Tables

Currrent Performance Table


HDSL Current Index SC instance Read-only The index value that uniquely identifies the interface to which this entry is applicable. SC

instance defines the slot, line, drop. and interface, which is in this case, can be an E1 o

loop interface.HDSL Current ESs Gauge Read-only The number of errored seconds encountered

by an E1 or loop interface in the current 15 interval.

HDSL Current SESs Gauge Read-only The number of severely errored seconds encountered by a loop or E1 interface in the

current 15 minute interval.

HDSL Current UASs Gauge Read-only The number of degraded seconds encountered by a loop or E1 interface in the

current 15 minute interval.HDSL Current DMs Gauge Read-only The number of degraded minutes encountere

by a E1 interface in the current 15 minute interval.

HDSL Current FEBEs

Gauge Read-only The number of Far End Block Errors encountered by a loop interface in the curren

15 minute interval.

Internal Performance Table

HDSL Interval Index SC instance Read-only The index value that uniquely identifies the interface to which this entry is applicable. SC

instance defines the slot, line, drop. and interface, which is in this case, can be an E1 o

loop interface.HDSL Interval

NumberInteger Read-only (1..96) A number between 1 and 96, where 1 is the

most recently completed 15 minutes intervaand 96 is the least recently completed 15

minutes interval (assuming that all 96 intervalare valid).

HDSL Interval LESs Gauge Read-only The number of erred seconds encountered ba loop or E1 interface in one of the previous 9

individual 15 minute intervals.HDSL Interval SESs Gauge Read-only The number of severely errored seconds

encountered by a loop or E1 interface in one othe previous 96 individual 15 minute intervals

HDSL Interval UASs Gauge Read-only The number of unavailable seconds encountered by a E1 interface in one of theprevious 96 individual 15 minute intervals.

HDSL Interval DMs Gauge Read-only The number of degraded minutes encountereby a loop or E1 interface in one of the previou

96 individual 15 minute intervals.HDSL Interval

FEBEsGauge Read-only This variable represents the HDSL loops Fa

End Block Errors.

3-22 GDC GT 1030 / GT 2030 073R500-000 Issue 01


.

Table 3-12 HDSL Performance Tables (Cont.)

Table 3-14 Loop/E1 Performance Interval Maintenance Table

Total Performance Table


HDSL Total Index

SC instance Read-only The index value that uniquely identifies the interface to which this entry is applicable. SC

instance defines the slot, line, drop. and interface, which is in this case, can be an E1 or

loop interface.HDSL Total ESs Gauge Read-only The number of errored seconds encountered

by an E1 or loop interface in the previous 24hour interval.

HDSL Total SESs

Gauge Read-only The number of severely errored seconds encountered by a loop or E1 interface in the

previous 24 hour interval.

HDSL Total UASs

Gauge Read-only The number of unavailable seconds encountered by a loop or E1 interface in the

previous 24 hour interval.HDSL Total DMs Gauge Read-only The number of degraded minutes encountered

by a E1 interface in the previous 24 hour interval.

HDSL Total FEBEs

Gauge Read-only The number of Far End Block Errors encountered by a loop interface in the current

15 minute interval.


HDSL Interval Maintenance

Index


instance defines the slot, line, drop. and interface, which is in this case, can be an E1 or

loop interface.HDSL Reset

IntervalsInteger Read-write Normal (1)

Reset (2)This variable is used to reset loop/E1

performance intervals. When it is set to reset,the loop/E1 performance tables are set to zero

HDSL Number of Valid Intervals

Integer Read-only (1..96) This variable is used to read the number of intervals collected. Each interval is an

increment of 15 minutes.

073R500-000 GDC GT 1030 / GT 2030 3-23Issue 01


l

Table 3-15 HDSL Status Table


HDSL Loop Status Line

Index

SC instance Read-only This object identifies status parameters associated with the managed object.

HDSL Loop Startup

Integer Read-write Normal (1)Start (2)

Cancel (3)

Supports the action of initializing HDSL loop startup sequence. When set to start, HDSL unit reinitialize the startup sequence. Set to

cancel, the unit aborts the startup sequence.Normal, the unit operates normally.

HDSL Loop Tip and Ring

Reversal Mode

Integer Read-only Normal (1)Reversed (2)

Signals the loop Tip and Ring status. When normal, the loop operates normally. When

reversed, loop Tip and Ring have been reversed.

HDSL Loop Signal to Noise

Margin

Integer Read-only (0..127) Represents the loop signal to noise margin indB units.

HDSL Loop SN Frac

Integer Read-only (0..5) Used with the HDSL loops signal to noise margin variable in the following manner:1. Only the values 0 and 5 are allowed.

2. The value of zero means HDSL loops signato noise margin is a whole number.

3. The value of five means HDSL loop signal tonoise margin is a real number and that 0.5

must be added to it.HDSL Loop SN

Atten SenseInteger Read-only Positive (1)

Negative (2)Identifies the sense of the HDSL loop signal to

noise margin variable.HDSL Loop

PulseAtten

Integer Read-only (0..100) Represents twice the HDSL loop pulse attenuation level in dB units.

HDSL Loop Pulse Atten Frac

Integer Read-only (0..5) This variable is used with the HDSL loop pulse attenuation variable under the following

conditions:1. Only the values 0 and 5 are allowed.

2. The value of zero means HDSL loop pulseatten is a whole number.

3. The value of five means HDSL loop pulse atten is a real number and that 0.5 must be

added to it.

HDSL Loop Gain Integer Read-only Low (1)High (2)OK (3)

Represents the HDSL loop gain setting.

3-24 GDC GT 1030 / GT 2030 073R500-000 Issue 01


Table 3-16 DTE Status Table (DTE Interface Only)

Table 3-17 HDSL Alarm Object Identifier Definitions


DTE Status Index


instance defines the slot, line, drop.DTE DTR Status Integer Read-only Off (1)

On (2)`DTR EIA status indicator.

DTE DCD Status Integer Read-only Off (1)On (2)

DCD EIA status indicator.

DTE RTS Status Integer Read-only Off (1)On (2)

RTS EIA indicator.

Alarm Name Maskable ? Applies To

HDSL No Response Alarm No UnitHDSL Diagnostic Rx Error Alarm No Unit

HDSL Power Up Alarm No Unit

HDSL Unit Failure No UnitHDSL Check Sum Corrupt No Unit

HDSL Loss of Signal Yes L1, L2

HDSL Unavailable Second Yes L1, L2HDSL Errored Second Yes L1, L2

HDSL Loss of Sync Word Yes L1, L2

073R500-000 GDC GT 1030 / GT 2030 3-25Issue 01


3-26 GDC GT 1030 / GT 2030 073R500-000 Issue 01

y also ides a ter nable

H/S

ignal and

en the .

Chapter 4: Tests

OverviewThis chapter is divided into the following main paragraphs: Loopback testing hard and soft,troubleshooting procedures, and the Maintenance Menu screens and descriptions.

The unit displays the status of these tests through the indicators on the front panel. You mause the optional terminal connected to the CONTROL port on the back panel. Doing so provcomprehensive set of features for testing operation and identifying trouble areas. This chapprovides instructions for managing the system by means of a terminal, and tells you how to eand disable various loopbacks.

Troubleshooting Procedures

LEDs are OFF:

1. If all the LEDs are OFF, verify that there is power to the unit.

2. If the terminal is working, check the status of voltage 1, voltage 2 on the terminal's ViewConfig screen. If there is a problem send for repair.

Start Up Continuously Fails:

1. If an HDSL red ES LED is continuously ON during start-up, the card is not receiving a sfrom the far end of its channel. Check the loop connections between the two cards (LTUNTU).

2. Verify that one card is configured as LTU and the other as NTU.

3. Check the status of the card in the View H/S Config screen.

Maintenance MenuThe Maintenance Menu is used to perform maintenance and troubleshooting activities. To opMaintenance Menu, select item 3 on the Main Menu. Figure 4-1 illustrates the Maintenance Menu

Important The activation of any loopback disrupts the flow of user data traffic.

073R500-000 GDC GT 1030 / GT 2030 4-1Issue 01

Tests Maintenance Menu

Figure 4-1 Maintenance Menu

The functions available from the maintenance menu are as follows:

• Loopbacks

• BER Test

• Reset Statistics

• Board Reset

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4-2 GDC GT 1030 / GT 2030 073R500-000 Issue 01

Tests Loopback Testing

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.

Loopback TestingThis function is used to enable/disable loopbacks on the user's equipment interface and on HDSL loops for maintenance purposes. The HDSL systems offered by GDC provide three tytest loopbacks. Figure 4-2 shows the simplified signal paths when the loopbacks are connecte

Figure 4-2 Loopbacks Signal Paths

Figure 4-3 shows a typical loopback setting screen for a HDSL system using a DTE interface

Line loopback [ 1 ]

HDSL loopback [ 2 ]

Remote local loopback [ 3]

V54 Remote local [ 3 ]

HDSL Loop 1Interface




UserInterface

UserInterface

ProcessingProcessing

2

21

HDSLLoop

2

HDSLLoop

1

Local HDSL System Remote HDSL System

3

073R500-000 GDC GT 1030 / GT 2030 4-3Issue 01


ON

. The

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Figure 4-3 Loopback Screen

Operation

To access the Loopbacks function, select item 1 on the Maintenance Menu.

To change the state of a loopback, use the following procedure:

1. Type the number of the line of the desired loopback. This toggles the selected loopbackand OFF.

2. Highlight the desired option, and press Enter to send the command to the HDSL systemoption menu closes, and the new selection appears in the corresponding line.

3. To exit and return to the Maintenance Menu, press the Esc.

Loopback Testing (Hard)

The GT 1030 and GT 2030 support two types of loopbacks at the front panel:

LL - Line Loopback loops the data back towards the user's equipment interface. The umust be configured for external timing for this loopback to be functional.

RL - Remote Loopback signals the remote unit to loopback the data at it's user's equipinterface. There are two types of remote loopbacks depending on the front panel RL curation (see Configuration screen). One is EOC remote local loopback which sends loback information over the EOC channel. The other is V.54 remote local loopback whicsends an inband V.54 loopback code signaling the remote circuit into loopback.

The forward signal for both of these loopbacks is transparent.

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4-4 GDC GT 1030 / GT 2030 073R500-000 Issue 01


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Loopback Testing (Soft)

You may also use the optional terminal connected to the CONTROL port on the back panel provides a comprehensive set of features for testing operation and identifying trouble areasmay use loopbacks to enable/disable loopbacks on the user's equipment interface and on thloops, for maintenance purposes.

The HDSL systems offered by GDC provide three types of test loopbacks available from theoptional terminal. Figure 4-2 shows the simplified signal paths when the loopbacks are conne

Line Loopback

The line loopback is generally used to test the connections between the local user's equipmthe HDSL system module.

When the local line loopback is connected (ON) (loopback [ 1 ] ), the data signal received from thelocal user via the transmit line of the user's equipment interface is returned by the HDSL sysmodule on the receive line of that interface. Therefore, during normal operation the local usequipment should receive it own signal without errors.

The local user transmit signal is transparent and therefore is sent to the remote HDSL systehowever the signal received from the remote HDSL system is lost.

HDSL Line Loopback

The HDSL loopback is generally used to test the proper operation of the HDSL system, andtherefore should be used after normal operation is obtained.

When the HDSL loopback is connected (ON) (loopback [ 2 ]), the transmit signal of each HDSL loop is returned by the HDSL loop interface (s) of this HDSL system module on the receive pthe same loop. Therefore during normal operation the local user's equipment should receive signal without errors.

The local user transmit signal is transparent and therefore sent to the remote HDSL system, hthe signal received from the remote HDSL system is lost.

Remote Local Loopback

The remote local loopback is generally used to test end-to-end the proper operation of the Hlink, and therefore should be initiated by the LTU only and used after normal operation is obt

When the EOC remote line loopback is connected (ON) (loopback [ 3 ]), the data received by the remote module from the local user is returned by the HDSL system module on the receive pwithin the remote user's equipment interface. Therefore, during normal operation the local uequipment should receive its own signal without errors.

The local user transmit signal is also passed to the remote user's equipment connected to thsystem, however the signal transmitted by the remote user is lost.

V.54 Remote Loopback

The V.54 remote loopback is generally used to test the proper operation of one remote to aYou should use it after normal operation is obtained. When the V.54 loopback is selected (loo5), the initiating unit sends V.54 inband code to the other remote unit. Upon receiving an acknowledgment the initiating unit turns it's TM LED ON indicating the far-end unit is in the loopback mode.

When the loopback is engaged, you will see error-free data returning. The other remote uniwill be blocked.

073R500-000 GDC GT 1030 / GT 2030 4-5Issue 01

Tests Considerations in the Use of Test Loopbacks

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In the case when the other unit doesn't acknowledge the V.54 inband loopback code, or errtransmit the acknowledgment, the initiating unit continues sending V.54 inband code and bldata until there is a correct acknowledgment, or the loopback command is terminated.

Considerations in the Use of Test Loopbacks

The test loopbacks are designed to allow systematic testing of the signal paths along the linstarting from one end of the link (the "local" HDSL module). In most situations, it is recommento initiate the loopbacks from the side serving as the LTU, because this would allow you to fthe signal path starting from the office and continue toward the end user in addition to maintasystem timing. All of the test loopbacks are transparent.

The recommended order of test activation is as follows:

1. Line loopback.

2. HDSL line loopback.

3. Remote local loopback

4. V54 remote local loopback.

This is also the order in which the loopbacks are listed on the LOOPBACKS screen.

BER Test

This screen is used to perform bit error measurements on an HDSL system module.

Testing Method

BER testing is performed by repeatedly transmitting a pseudo test sequence having a length-15-1 bits, and comparing by means of an error detector the received sequence. Any differenceassumed to be an error and is counted. To perform a meaningful comparison, the error couinhibited until the error detector becomes synchronized to the incoming sequence. During thsynchronization, it is possible to see a burst of 255 errors.

During this testing, your traffic is disconnected. BER tests may be performed in an end-to-endthat requires both LTU and NTU BER testers to be on. If testing is initiated at one end, a looalong the signal path needs to be connected. The loopback can be a physical connection msomewhere along the signal path or a test loopback activated at the desired location as descthe Loopbacks paragraphs of this manual. Alternatively, an external BERT may be connectedremote unit to facilitate testing.

The measurement is carried out over discrete intervals (an interval corresponds to the time refor a transmission block of 224 bits). The number of errors that are counted in each interval canup to 255. If the actual number of errors in a given interval is higher, this maximum count is considered in the calculation of the BER. The calculated BER is updated at the end of each i

The bit error rate test can be performed over individual HDSL loops or over the entire HDSLbandwidth. (Only one BERT test can be active at a time). For the point-to-point mode of operthe BER test can only be performed over all the loops. For point-to-multipoint, you can perforBERT test on individual loops.

BER testing can be performed through the GDC UAS Controller, supervisory terminal port orpanel switch. The front panel LED TM is on when the BER test is initiated. When the error deteis in sync and detects no errors, the TM LED is solid on. However, when the error detector issync or detects some errors, the TM LED blinks.

4-6 GDC GT 1030 / GT 2030 073R500-000 Issue 01

Tests BER Test

Test Configuration

Figure 4-4 BER Test Configrations and Notes

Master Remote

BERTest

Remote Self-Test:Enable BER test on remote unit. Be sure you have an external loopback or test equipment at the master unit to facilitate this test.

Master Remote

BERTest

Master Self-Test:Enable Master BER test. Be sure you have an external loopback or test equipment at the remote unit to facilitate this test.

Master Remote

BERTest

Master to Remote Self-Test:Enable BER test on both Master and Remote unit.

Master Remote

BERTest

Self-Test with Remote Loopback:From Master unit, assert Remote Loopback (RL) and enable BER test.

BERTest

Remote

BERTest

Remote Self-Test with V.54 RDL:Place far-end remote into Remote Loopback by sending V.54 code and turn on the self-test on that remote. This test can only be initiated from the front panel or supervisory terminal. Both remote units must be GT2030s.

Master RemoteMaster

073R500-000 GDC GT 1030 / GT 2030 4-7Issue 01

Tests BER Test

n, and

BER Screen Description

A typical screen for BER testing is shown in Figure 4-5.

Figure 4-5 BER Test Screen

The dialog box used to control BER testing has two areas:

• The top area is used to display BER results.

• The bottom area is used to select the desired HDSL loop you want to perform the test oto start/stop BER measurement.

The fields of the BER Test dialog box are described in Table 4-1.

Table 4-1 BER Test Screen Fields

Status Displays the current status of the error detector: Sync - The error detector is synchronized, and the BER measurement is possible. Out-of-Sync - The error detector is not synchronized, and BER measurement is inhibited.

Intervals Displays the number of measurement intervals up to this point.BER Displays the BER calculated up to this point.Loopback Displays the current state of the loopback activated for the purpose of the BER test: No

loopback has been activated. In this case, an external loopback, e.g., a physical loopback connection, must be connected before starting the BER test. Remote Local - Remote line loopback is activated for the BER test.

Execution Displays the next state of BER measurement: Press SPACEBAR to start - BER measurement disabled. Press SPACEBAR to stop - BER measurement enabled.

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4-8 GDC GT 1030 / GT 2030 073R500-000 Issue 01

Tests BER Test

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Operation

1. To display the BER TEST screen, select item 2 on the Maintenance Menu.

2. Select the HDSL loop you want to perform the test on by moving the selection block to tHDSL loop field. Press the spacebar to select the desired HDSL loop.

3. Make sure a loopback is activated. If the Loopback field displays None and no external loopback is currently connected, change the state of the loopback used for BER measurMove the selection block to the Loopback line and press the spacebar.

To enable/disable BER testing:

1. To start the BER measurement, move the selection block to the Execution field and presspace bar. The Execution field now shows Stop.

2. To stop the BER measurement, move the selection block to the Execution line and presspace bar. The Execution field now shows Press SPACEBAR to start.

To exit and return to the maintenance menu, make sure that BER testing has been disabledpress the ESC key.

Reset Statistics

The Reset Statistics option resets all the performance statistics entries of the unit.

Operation

To instruct the unit to reset all the performance statistics counters:

1. Select item 4 on the Maintenance Menu. You will see a dialog box with two options: Yes and No.

2. To reset the statistics, move the selection block to Yes, and press Enter.

3. To exit without resetting press Esc, or move the selection block to No, and press Enter.

Board Reset

This option is used to reset the unit.

To reset the unit, select item 6 on the Maintenance Menu. After a few seconds, the openingwill appear. The unit performs the start-up process, and displays the Main Menu screen.

Note You cannot exit the BER TEST screen while a BER test is running.When you start or stop the BER test on one of the HDSL loops, the other loop(s) see buerrors on its data.The BER test detector will synchronize and show error-free for all 1s and all 0s pattern.

073R500-000 GDC GT 1030 / GT 2030 4-9Issue 01

Tests BER Test

4-10 GDC GT 1030 / GT 2030 073R500-000 Issue 01

stem.

2030 DCE GT tween ble is

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Chapter 5: Application Guide

OverviewThis chapter includes timing notes and typical applications to assist you in configuring your sy

Timing Options

High Channel Data Rate Application

The length of the cable connecting the customer equipment (the DTE) to the GT 1030 or GTis an important factor when using DCE timing in a high channel data rate application. (With timing, the GT 1030 or GT 2030 provides timing to the DTE. The DCE timing options in the 1030 or GT 2030 include Looped Timing and Internal Timing.) The cable creates a delay bethe unit’s clock and data arriving from the DTE. When this delay is too great (because the catoo long or the rate is too high), it can cause errors.

If errors occur with DCE timing, you can use External Timing for the GT 1030 or GT 2030 andtiming for the DTE. This permits operation at any data rate, regardless of cable length. (Notthe ITU-T V.35 recommendation limits cable length to about 30 m.) Refer to Figure 5-1 and the Chapter 3 - Operation for configuring timing options.

Figure 5-1 High Channel Data Rate Application

Note Select the appropriate timing option for the DTE: The DTE must loop timing from the CRcv Clk lead to the Chnl Ext Clk lead.

Loop 2

HDSL DTETXD

EXT CLK

RX CLK

Loop 1

External Timing Recovered or

RecoveredTimingHDSL

TimingTranslator

RXD

Looped Timing

073R500-000 GDC GT 1030 / GT 2030 5-1Issue 01

Application Guide Typical Applications

em.

Typical ApplicationsFigures 5-2 through 5-6 show typical applications and option settings for configuring your syst

Figure 5-2 Single Loop Point-To-Point Application

Figure 5-3 Two Loop Point-to-Point Application

Unit Type: LTU NTU

Enabled Loops: 1 1

Application: P2P P2P

FP Enable: Enabled Enabled

Tx Clock Mode: External Looped

CTS Mode: ON ON

Data Rate: 18x64Kbps 18x64Kbps

V.54 RX Mode: Disabled Disabled

FP RL Mode: EOC EOC

Unit Type: LTU NTU

Enabled Loops: 2 2

Application: P2P P2P

FP Enable: Enabled Enabled

Tx Clock Mode: External Looped

CTS Mode: ON ON

Data Rate: 32x64Kbps 32x64Kbps

V.54 RX Mode: Disabled Disabled

FP RL Mode: EOC EOC

5-2 GDC GT 1030 / GT 2030 073R500-000 Issue 01


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Figure 5-4 Point-to-Point MultiPoint Data Grooming Application

Figure 5-5 Fractional G.704 Service (2 Loop) Application

Remote 1 Remote 2 Remote 3it Type: LTU Unit Type: NTU NTU NTU

abled Loops: 3 Enabled Loops: 1 1 1

Enable: Enabled Application: P2MP P2MP P2MP

e Unit: TLU FP Enable: Enabled Enabled Enabled

e Code: HDB3 Tx Clock Mode: Looped Looped Looped

ame Mode: Framed CTS Mode: ON ON ON

16: Data Data Rate: 18x64Kbps 10x64Kbps 2x64Kbps

V.54 Rx Mode: Enabled Enabled Enabled

FP RL Mode: V.54 V.54 V.54

twork Configurationplication: P2MP

op 1 Start DS0: 1

op 1 Consecutive DS0: 18

op 2 Start DS0: 19


op 3 Start DS0: 29


Unit Type: LTU Unit Type: NTUEnabled Loops: 2 Enabled Loops: 2FP Enable Enable Application: P2PLine Unit: TLU FP Enable: EnabledLine Code: HDB3 Tx Clock Mode: LoopedFrame Mode: Framed CTS Mode: ONTS16 Data Data Rate: 24x64Kbps

V.54 Rx Mode: EnabledFP RL Mode: V.54

Network ConfigurationApplication: P2PLoop 1 Start DS0: Not ApplicableLoop 1 Consecutive DS0: Not ApplicableLoop 2 Start DS0: Not ApplicableLoop 2 Consecutive DS0: Not Applicable

073R500-000 GDC GT 1030 / GT 2030 5-3Issue 01


Fractional G.704 Service (1 Loop)

Figure 5-6 Fractional G.704 Service (1 Loop) Application

Unit Type: LTU Unit Type: NTU

Enabled Loops: 1 Enabled Loops: 1

FP Enable Enable Application: P2P

Line Unit: TLU FP Enable: Enabled

Line Code: HDB3 Tx Clock Mode: Looped

Frame Mode: Framed CTS Mode: ON

Data Rate: 4x64Kbps

V.54 Rx Mode: Enabled

FP RL Mode: V.54

Network ConfigurationApplication: P2P

Loop 1 Start DS0: 1

Loop 1 Consecutive DS0: 4

5-4 GDC GT 1030 / GT 2030 073R500-000 Issue 01

DataCommGeneral