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TCT 6B

TEJAS STM EQUIPMENTS

By

V SRINATH ITX2

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INTRODUCTION to TEJAS NETWORKS

• Tejas Networks is an India-based optical and data networking products company. Tejas has developed & delivered a range of high-quality Optical Transmission and Carrier Ethernet equipment. Next-Gen SDH/SONET equipment are available in line rates ranging from STM-1/OC-3 to STM-64/OC-192, with a very rich set of service interfaces and optics options.

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TEJAS STM-1 EQUIPMENT (TJ100MC-1)

•Tejas STM-1 systems are classified as

TJ100MC-1TJ100CPTJ100LT

•Depending on the capacity requirement they are used. All are STM-1 capacity.IR

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Modular arrangement in TJ100MC-1 Equipment

➢2 slots for Power Supply Units (PSU)

➢1 slot for Lite Tributary Card

➢ 3 slots for tributary

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1.Power Supply Unit (PSU)2.Lite Tributary Card (LTC)3. E3 Tributary Card (TE31)4. E1 Tributary Cards (TET16, TET21, TET28)5. STM-1 Aggregate/Tributary Cards (A011)6. Ethernet Tributary Card (TP01)7. Ethernet Tributary Card (TP01FT)

MODULES USED

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•Fits in Slot1 and Slot2 of the TJ100MC-1The ideal DC voltage operation is at -48VThe range of voltage for safe operation is -39V to -60V

•If the input voltage is in the range -60V to -56V thenthe alarm input voltage high is reportedIf the input voltage is in the range -43.2V to -39Vthen the alarm input voltage low is reported

•If the voltages are in the range of -35V ± 4V or -65V+/- 4V then the node will automatically shutsdown

Power Supply Unit (PSU)

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•An out put voltage of +12V is derived from the input of -48V and used by the backplane

•Individual cards requiring 3.3V for operation takes +12V and steps down locally

•Cards like OAM modules uses +12V directly

•Output (derived) voltage high/low alarms are fixed setting ( +12V±5%) is not user configurable

•Reverse polarity voltage protection up to +75V (node will not work though)

Power Supply Unit

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•Redundancy single feed dual module (using D type connector)

•The PSU is protected against output short circuit,over voltage and under voltage•Input over voltage and under voltage protectionis provided.•Output over voltage protection is latched and theunit will not restart until power to the unit isremoved and reconnected.

Power Supply Unit

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•The system card (LTC) is the heart of the TJ100MC-1. •It plugs into Slot3 and provides the aggregate interfaces, clocks, processing and monitoring capability to the system.

LITE TRIBUTARY CARD (LTC)

•Power Supply RequirementsSupply Voltages: 12V ± 20%, supplied via two 12-pin power connector.Power Consumption: 16W typical

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•Processor bus for control path communication to the other cards in the sub rack (to the backplane)•Two Telecom buses for the data path interface to the tributary cards•System clocks and timing signal (to the backplane)•Two STM-1 optical interfaces, SC-PC type•Flash Disc•Diagnostic port (Diag.)•NMS(10/100BaseT Ethernet interface (RJ45) for communication with the network management system via a LAN•RS232C port for local craft terminal•Serial port•Engineering Order-wire (EOW) interface for 2-wire communication•BITS clock and data inputs and outputs on 9 pin D connector•External alarm inputs and alarm outputs on 15 pin D connector

LITE TRIBUTARY CARD (LTC) interfaces

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•The LTC has two SC-PC, STM-1 optical I/F on the front panel. •The STM-1 transceivers are shipped with S1.1, L1.1 or L1.2 specifications.

Optical Interface Specification

STM – 1 Optical Interface

Specifications S1.1 L1.1 L1.2

Output Power -15 dBm -5dBm -5dBm

Output Power (Max.) -8 dBm 0 dBm 0 dBmReceiver Sensitivity -28 dBm -34 dBm -34 dBm

Receiver Overload -8 dBm -10dBm -10dBm

Optical Path Penalty 1 dB 1 dB 1 dB

Section Loss 0 to 12 dB 10 to 28 dB 10 to 28 dBWavelength (nominal) 1310 nm 1310 nm 1550 nm

Spectral Range 1261-1360 nm 1263-1360 nm 1480-1580 nm

Connector Type SC-PC SC-PC SC-PCFiber Type Single mode Single mode Single mode

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•A non-volatile memory used as a flash disk to store all details which are subjected to modifications like Ethernet IP, Router ID, cross connections, Performance monitoring parameters, alarms etc.,•STM1 and STM4 use flash disk capacity of 128MB•STM16 uses flash disk capacity of 256MB•An On-board memory is also used to store all details which are not subjected to modifications

Flash disk

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•Diag is the Diagnostic port•Diag interface on the Network Element can be either a USB, RJ 45 or a DB-9 interface• DIAG interface is provided with the flash disk for logging on to it and retrieving the configuration details• With Diag, it is possible to retrieve Ethernet IP of the Network Element by connecting the Diaginterface to the serial port of the PC and is accessed through HyperTerminal in Windows PC or Minicomin Linux PC.

Diagnostic port

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•NMS port is a RJ 45 interface CSMA/CD based LAN trans-receiver of an Ethernet link provided in all products• NMS port is useful in commissioning of a NE by connecting the NMS port of the node to the LAN port of the PC using Straight or Cross cable, and GUI of NE can be opened with default IP of the NE ensuring PC and NE are on the same IP subnet.• By connecting the NMS ports of two Network Elements with a Cross Cable, Ethernet management can be achieved, ensuring both NE are on the same IP subnet

NMS (Network Management System) port

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•This is an RS232C connector.

•The default baud rate setting is 9600

bauds, 1 stop bit, no parity and no

hardware/software flow control.

Craft Interface

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•Serial Port is used to establish serial communication between two Network Elements• Serial port can be configured for Craft application using UDC (User Data Channel) protocol using F1 byte (in RSOH), F2 byte (in HOPOH) of the STM frame•F1 and F2 bytes can also be tunneled from STM port to another•The baud rate of serial port applicable are either 57600 or 9600 – other parameters can be set to default

Serial Port

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EOW(Engineering Order Wire) port

•EOW port is a RJ45 interface on the NE which provides 64Kbps channel for voice communication•EOW can be configured using E1 byte (in RSOH) or E2 byte (in MSOH) of the STM frame.• Each NE is connected to a hand set.(It is ensured that RJ11 connector can be jacked in this RJ45 interface with matching pins)•Based on Network Topology, the NE s are allocated a segment no. and hand sets are allocated an order wire no.

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EOW(Engineering Order Wire) port

EOW EOW

3-1 (E1) 3-2

NE1 NE2

•Segment no. can vary from 00 to 99 and order wire no. can vary from 000 to 249. No.250 is used for unidirectional broadcast•Order wire can be protected by a different path•E1 and E2 bytes can also be tunnelled from one STM port to another

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BITS Data/Clock

•BITS stands for Building Integrated Timing System▪It is either a RJ45 or DB9 interface▪An external hardware (clock source or data source) can be connected to BITS port for clock synchronization purpose eg., GPS synchronized clock▪ BITS OUT port in one node is used to connect to the BITS IN port of another node which are co-located▪BITS interface can have 1 clock in (2 MHz) and/or 1 clock out (2MHz) and /or 1 data in (2Mbps) and /or 1 data out (2Mbps)▪ All Tejas products have a common BITS IN/OUT port with separate pins for CLK in/out (BITS1) and Data in/out (BITS2)

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BITS Data/Clock continued

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▪Indicates the severity of the alarms being reported on a network element and are part of OAM module▪Alarm LEDs can indicate the following severity levels•CRITICAL•MAJOR•MINOR•DEFERRED(an alarm of severity level deferred gets reported on the node with some delay or the alarm reporting is acknowledged)▪The alarms indicate only the severity not the no. of alarms reported

Alarm LEDs

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•Alarm IN interface▪It can be either RJ45 or DB15 interface is used to report an external alarm (ambient temperature high, access door open, AC shut down etc.,) on network element▪ Alarm IN interface can report a maximum of 2 or 5 or 7 external depending on the product▪Alarm IN can be potential free or potential contacts(3.3V)

Alarm interfaces

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•Alarm OUT Interface▪It can be either RJ45 or DB15 interface▪It is used to take the contact which makes the Critical, Major, Minor LEDs glow, to a distant location (security room, control desk)▪An audible alarm called Hooter Alarm is present in some products and corresponding alarm reset button is present to mute the hooter▪Can be used to report a maximum no.of 3 or 4 alarm severities (Critical, Major, Minor ,hooter)

Alarm interfaces continued

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A push –to-reset button is provided on the frontpanel of the LTC. The reset button is recessed toprevent accidental operation. Use a pointed object(such as the tip of a ballpoint pen or a pencil) tooperate the switch.This switch causes a processor reset and will force areload of the operating system and the applicationsoftware. This reset is service non-affecting. Thisreset is to be used in the case of a NE ‘hang’. A‘hang’ will get resolved within 1024 Seconds whenthe hardware timer expires and a service non-disruptive reset is triggered.

Network Element Reset

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“Hang” is defined as a condition where the node does not respond to user commands, but provisioned traffic continues to work.

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Interface Cards

Tributary Card E1- TET16/TET21/TET28

•16/21/28 E1 ports

• Power is on and the card is recognized –Status LED glows GREEN

• The card is fully up - Active LED glows GREEN

•Power Supply RequirementsSupply Voltages: +12V ± 10%,

Power Consumption: 8W.

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STM-1 Tributary Card - A011•1 port STM1, optical interface• Power is on and the card is recognized –Status LED glows GREEN • The card is fully up - Active LED glows GREEN •Receiver Sensitivity

S1.1 –28 dBmL1.1 –34 dBmL1.2 –34 dBm

Power Supply RequirementsInput Voltage: 12V± 10%, Power Consumption: 12W (Max.)

Interface Cards

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Ethernet Interface Card TP01

•Has 8, 10/100Mbps Ethernet ports•Power is on and the card is recognized – Status LED glows GREEN •The card is fully up - Active LED glows GREEN• Power Supply RequirementsInput Supply Voltages: 12V ± 10%Power Consumption: 8W(Max.)

Interface Cards

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Ethernet Interface CardTP01FT

•supports four 10-Base T/100 base

T Ethernet ports and four 100BASE-FX Ethernet ports.

•Power is on and the card is recognized – Status LED glows GREEN •The card is fully up - Active LED glows GREEN •Power Supply RequirementsInput Supply Voltages: 12V ± 10%Power Consumption: 10W(Max.)

Interface Cards

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•The TJ100MC-4L is a carrier class, cost effective and modular bandwidth provisioning equipment designed to manage and derive services from the optical core to the access. •It can be configured as a Terminal Multiplexer (TMUX), Add-Drop Multiplexer (ADM), Regenerator, In-Line Amplifier or as a standalone Cross-connect. •A variety of service interfaces such as E1, E3, E4, STM-1e/o and 10/100 Mbps Ethernet tributary interfaces and trunk interfaces at STM-1/4 rates are supported.• It features non-blocking cross-connect at VC-3, VC-4 and VC-12 granularity and supports drop and continue functionality.

TEJAS STM-4 EQUIPMENT (TJ100MC-4L)

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Multi Function Card (MFC) Slot No.18

TP 01AO11 STM I

AO41 STM 4 XCC XCC SCU SCU

AO41 STM 4 TET

281 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Power Supply unit (PSU)Slot No.16

Power Supply unit (PSU) Slot No.17

(TJ100MC-4L)Architecture Node View

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•Power supply unit (PSU)•Multifunction Card (MFC1)•Ethernet Tributary Card (TP01)•STM-1 Aggregate Card (A012)•STM-4 Aggregate card (A041)•Cross-connect Card (XCC16L)•System Control Unit (SCU4)•E1 Tributary Card (TET28)

The MC-4L system of Tejas networks consists ofthe following units

EQUIPMENT DESCRIPTION

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•The MFC1 is used to implement miscellaneousinterfaces.• This card is plugged into the slot 18 of the TJ100MC-4Lchassis.•This card supports the following interfaces along withthe visual alarm indicators.•Order- wire interface•10/100 NMS Ethernet interface•Two serial interfaces for modern and craft interfaces•Alarm input and output interfaces.•MFC1 consumes a maximum power of 4 W, at 12 V DC.

Multi Function Card (MFC1)

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•The STM-1 aggregate cards, A011 and A012 aredesigned to function as one port STM-1 and twoport STM-1 aggregate cards respectively•This card can be plugged into any of the slotsfrom 1 to 5 and 10 to 15 of the TJ100MC-4Lchassis•Visual Indicators are provided on the front panelof the STM-1 aggregate card.The visual indicators include the Active and theStatus LEDs and an LED each for TX and RX for theSTM interfaces.

STM-1 Aggregate Card (A011, A012)

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•The STM-4 tributary card is designed to function as one port STM-4 aggregate card. The A041 card has one optical Transceiver operating at STM-4 rate for the aggregate interface•The optical Transceiver mounted on the card can be of L/S4.1/4.2 types•The maximum span can that be achieved with L4.2 Tran receiver is 24 dB (80 Km).

STM-4 Aggregate Card (A041)

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•The XCC16L is the cross-connect card that occupies slots 6 and 7 in the TJ100 MC4-L chassis. •The card consists of the cross-connect sub-system and the timing sub-system. The system provides for redundancy on the XCC16L card. •The cross connect subsystem consists of a non-blocking switch at VC-12 granularity. The timing subsystem has a stratum-3 timing module that generates the reference clocks for the entire equipment, including the SDH timing signals.

Cross-connect Card (XCC16L)

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• The master and slave card configuration of the redundant XCC16L cards can be forced using the hot swap switch.• When the hot swap switch is activated, the respective card renders the peer card as the master and takes over as a slave. •The switch is functional only on the card that is active provided another card is available in the standby configuration.

Hot Swap switch

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•The SCU4 card initiates the configuration and control of the other cards on the TJ100MC-4L system at boot-up. •The SCU4 card houses the processor subsystem (PSS) that handles the control path. •The system provides for redundancy on the SCU4 cards. •The SCU4 cards can be plugged into the slots 8 and 9 of the TJ100MC-4L chassis• The front panel supports a diagnostic interface through

an RJ-45 connector and two push button switches for soft

reset and redundancy control.

System Control Unit (SCU4)

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•The SCU4 consists of a 32 bit micro controller and an on board external memory to implement the required functions.• The software residing in this block controls the overall management of the system.•Provided with Hot Swap Switch•Reset switch: The reset switch, when

activated provides a non-service disruptive

reboot on the card.

System Control Unit (SCU4)

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CHAPTER - 3TEJAS STM

TJ1400 7-Slot Redundant

Chassis (TJ1400-7SR)IRIS

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TEJAS STM (TJ1400-7SR)

•TJ1400 (Type-7SR) is a 2 unit base chassis supporting redundant cross-connect fabric, timing/synchronization subsystem and control processor subsystem and east/west aggregate ports on separate circuit packs. •It also has redundant power supply modules enabling power supply redundancy.•This is a Multi Service Provisioning Platform equipment (MSPP).

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Cards Features

DPU(DC power supply unit) 8

Delivers 250 W power output and 12V output voltage Supports Redundancy

DPU18 Delivers 325 W power output and 12V output voltageSupports Redundancy

DPU20 Delivers 500 W power output and 11.8V ± 0.6V output voltageSupports Redundancy

XA14ET Provides 2 x STM-1 or 1 x STM-4 aggregate interfaceand 32E1 interface with LFH connectorsSupports an uplink capacity of 2.5G

Overview of the cards supported in TJ1400 (Type-7SR)

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XA10G Provides 1 x STM-16/OC-48 + 2 x STM-1 interfaceSupports uplink capacity of 10G

XA20G Provides 1xSTM-16 + 1xSTM-4 + 2xSTM-1 interface Supports uplink capacity of 16GSupports only SDH mode

XA60G Supports 1xSTM-64 and 2xSTM-4/16, and 2xSTM-1/4 interfacesSupports uplink capacity of 60G

ST63E1 Provides sixty three E1 interfaces

ST6E3 Provides six E3 interfacesSOT18 Provides 8xSTM-1, 2xSTM-4 and 1xSTM-16

line interfaces

Overview of the cards supported in TJ1400 (Type-7SR)

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CEF-1Supports 4 FE Electrical (10/100Base-Tx) and 2 GE Optical (1000Base-X) portsSupports switching capacity of 5G Supports STM -4/16 uplink bandwidth

CEF-4

Supports 2x10GE(XFP) and 2xGE (Optical,1000Mbps) ports Supports switching capacity of 64GbpsSupports 2xSTM-16/OC-48 uplink capacity

CEL-1 Supports 2xGE (Optical, 1000Mbps) +1xGE (Electrical, 10/100/1000 Mbps) + 3xFE (Electrical, 10/100 Mbps) portsSupports STM -16 uplink bandwidth

Overview of the cards supported in TJ1400 (Type-7SR)

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CEL-5 Supports 2xGE(optical, 1000Mbps) + 2xGE (Electrical, 10/100/1000Mbps)

+ 4xFE (Electrical,

10/100Mbps) ports Supports

STM -16 uplink bandwidthFTU20+OAM FTU20 is included as a part of the

OAM card Supports six fansOAM FeaturesProvides 10/100 BaseT LAN interfaceProvides NMS, Alarm IN, Alarm Out, BITS clock, BITS Data/Clock and EOW interfaces

Overview of the cards supported in TJ1400 (Type-7SR)

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Telecom bus allocation details

•The system supports telecom bus with STM 16 capacity for the tributary card slots. •This portion describes the card population rule of the TJ1400 (Type-7SR) equipment.

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S1 S5S10S2 S6

S3 S7

S4 S8 S9

Slot Allotment

•Slots 8 and 9 for Power supply modules •Slots 1, 3, 5, 6 and 7 for Tributary cards• Slots 2 and 4 for Cross-connect cards •Slot 10 for Fan tray unit

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•The XA14ET is the cross-connect and aggregate card for the system. •The system supports redundancy on the XA14ET card.• The card provides 2xSTM-1 or 1xSTM-4 aggregate interface and 32E1 interface with LFH connectors. •The card supports an uplink capacity of 2.5G.Power SpecificationsInput Voltage 12 V± 5%

Power consumption 14 WNOTE: XA14ET card is supported as processor card only in PTN mode with CEF-1 operation mode.

Cross Connect Card - XA14ET

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Functional Description of XA14ET

•XA14ET houses two optical transceivers operating at STM -1 line rate.•XA14ET houses one (P1) optical transceiver operating at STM -4 line rate.Digital Diagnostics

All diagnostic features of SFP optics (Receive power measurement, back facet, laser bias, temperature) can be monitored.

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➢Supports 2xSTM-1 or 1xSTM-4 interfaces➢Supports reset of processor with a reset switch➢Supports diag-audio jack➢Supports craft (MI/F1) interface

Functional Description of XA14ET

➢Clocking SchemeClocks from master XA14ET card are selected for clocking ST63E1 card. Default option is to use the clock from the backplane. Clocks from master XA14ET card are selected. IR

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Card State Status LED Active LED

Card initialization: State before thecard initialize is complete on cardinsertion.

Amber(Steady)

Amber(Steady)

Card in service: Initializationcomplete and card in service.

Green(Steady)

Green(Steady)

Card mis-match: Network Elementhas already configured the slot withsome other card.

Amber Amber

Card failed during boot up. Red Amber

Card failed while in-service. Red Green

Hard Reset: All devices reset, FPGAscleared and reprogrammed. Goes toinitializing state next.

Amber Amber

LED status and their significance- XA14ET

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•supports 2xGE (Optical, 1000 Mbps) optical interfaces. The optical interface is supported through SFP modules•supports 1x10/100 Base-TX/1000Base-T + 3 x 10/100 Base-TX electrical interfaces. The electrical interface is supported through RJ-45 connectors.•The card supports STM16 bandwidth•Power supply specificationInput Voltage :12 V± 10%Power consumption :25 W Maximum

Ethernet Transport Card - CEL-1

Features

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•CEL-1 card maps and de-maps the Ethernet data into the virtual containers of lower and higher order of the SDH frame.•CEL-1 card supports following functional features:➢VCGs support both SDH and SONET Virtual concatenation for SDH /SONET Jumbo frames up to 9216 bytes➢Higher order and lower order virtual concatenation ➢Auto-negotiation and flow control

Functional Description OF CEL-1

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Card State Status LED

Card initialization: State before the card initialize is completeon card insertion

Amber(Steady)

Card in service: Initialization complete and card in service. Green (Steady)

Card mis-match: Network Element has already configuredthe slot with some other card.

Amber

Card Admin down: Initialization complete and circuit pack inout-of-service state (and not failed).

Green

Card fails during boot up. Red

Card failed while in-service. Red

Hard Reset: All devices reset, FPGAs cleared andreprogrammed. Goes to initializing state next.

Amber

Card Admin down: circuit-pack out of service and failed RED

Soft Reset: Software is restarted, devices are re-initializedwith provisioning. Node goes to Initializing state next.

Amber

LED status and their significance-CEL-1

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•The DC Power Supply Unit (DPU8) is a part of thecommon unit of TJ1400 network element.•The DPU8 supports load sharing on redundancybasis i.e. if one PSU fails, other will be the activeload driver and provides a stable DC power to othercards in the system.•The DPU8 is also referred as PSU.•The PSU delivers 250 W power output, 12V outputvoltage.

Power Supply Unit- DPU8

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•The DPU8 consists of a single output DC-DC converter and all the cards including the base card have hot-swap controller and buck converters as required. •The output voltage is set to 12V.• The cards are required to derive the suitable voltages from the stable 12 V supplied by the DPU8.

Functional description of DPU8

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Operational specifications- DPU8

Specification Range

Input voltage Range -40 V to -72 V DC

Reverse polarityprotection Continuous

Input current 8.2A continuous, 10A Max. During normal operation

Operating temperature range

0°C to 50°C

Output voltage 12 V ± 0.6 V

Output current 21A

Ripple 120mVp-p

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Specification Range

Efficiency 85% @ >50% Load when input is 48V

Fuse 10 A Fast Acting Fuse

Under voltage protection Recovery: 38V ± 2VShutdown: Recovery - 4V

Over voltage protection Recovery: 72V ± 2VShutdown: Recovery + 4V

Hold-up time (Interruption) 2ms at 54V and above.

Power interface One no. of 3-pin Single level connector Phoenix 1827871

Operational specifications- DPU8

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Specification Range

Protections Over-temperature at 115°C ± 10°C and hysteresis of 15°C min (Auto-recovery)Output Short-Circuit (LatchedProtection)Output Over-Current (26A ± 2A, Latched Protection)Output Over-Voltage (13.6± 0.6V, Latched Protection)Input Reverse Polarity (Continuous)Input Under/Over voltage (Auto Retry Mode)

Operational specifications- DPU8

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FTU20 - Fan Tray Unit and OAM Functions

•FTU20 is included with the OAM card in the TJ1400 (Type-7SR).

Specification RangeInput Voltage 12 VPower consumption 54 W Maximum

•Power Specifications- FTU20IRIS

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•The OAM provides static user interfaces for configuration and visual indications. •OAM has the following functional features➢Provides NMS➢Alarm IN, Alarm Out➢ BITS clock, BITS data/clock➢ EOW interfaces Alarm LEDs (Critical, Major, Minor)➢User configurable alarm inputs➢Alarm outputs for Critical, Major, Minor and Deferred Temperature monitoring

Functional Description of FTU20

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•The following are the functional features of FAN➢Fuse on each fan power supply to isolate any failed fan from other fans➢Fan speed monitoring and control through software, based on the temperature sensed➢Temperature monitoring on the airflow path Field replaceable

Functional Description of FTU20

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Card State Status LED Active LED

Card initialization: State before the cardinitialize is complete on card insertion

Amber (Steady)

Amber (Steady)

Card in service: Initialization complete andcard in service.

Green (Steady)

Green (Steady)

Card mis-match: Network Element has alreadyconfigured the slot with some other card.

Amber Amber

Card failed during boot up. Red Amber

Card failed while in-service. Red Green

Hard Reset: All devices reset, FPGAs clearedand reprogrammed. Goes to initializing statenext.

Amber Amber

LED status and their significance- OAM

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LED Color LED Status

Critical LED

Red Critical alarm detected by network element

Off Default State. No Critical alarm detected

Major LED Red Major alarm detected by network element

Off Default State. No Major alarm detected

Minor LEDAmber Minor alarm detected by network

elementOff Default State. No Minor alarm

detected

Alarm LED status and their significance-OAM

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•The BITS clock input is at 2.048 MHz and can benominated as a reference for node synchronization• Loss-of-Signal (LOS) is detected on the clock input andthis triggers to change over to the next synchronizationreference. The timing reference failed alarm is reportedon the user interface.•The BITS data input is at 2.048 Mbps. Both PCM30 andPCM31 (with/without CRC) framing can be used on theinput. This input can be nominated as a reference fornode synchronization.•LOS, LOF and AIS are detected on this input and thistriggers to change over to the next synchronizationreference. The timing reference failed alarm is reportedon the user interface.

BITS Interface

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•The OAM provides seven external alarm inputs and four external alarm outputs.➢Alarm-In: The alarm inputs connect external triggers for events (such as open door or a shelf high temperature) to the OAM. ➢When an event occurs, which activates the trigger connected to the external alarm input, the network element raises an environmental alarm. ➢The external inputs are either enabled or disabled from the Network Element (NE) user interface. ➢The severity, alarm text and the SNMP trap ID can be edited from the network element user interface. ➢The Alarm-In interface is through a RJ-45 connector.

External Alarms Interface

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➢Alarm-Out: The alarm outputs can be used to trigger the operation of external equipment, such as a generator, fan or audible alarm. ➢The alarm outputs are caused by alarms detected by the NE.➢ The alarm-out is classified as minor, major and critical. ➢The Alarm-Out interface is through a RJ-45 connector. •There are three LEDs on the faceplate of OAM for Alarm out displays•Critical Alarm•Major Alarm•Minor Alarm

External Alarms Interface

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Card Status NMS LED (Green) NMS LED (Amber)

Link speed 10 Mbps - -

Link speed 100 Mbps - On

NMS port up On -

Receiver Activity Blink on packet received -

•The MGN interface helps to connect the network element to a PCterminal with an Ethernet cable of RJ-45 connector type.•NMS InterfaceThe NMS Interface provides a CSMA/CD based LAN transceiver ofan Ethernet link. This is available through an RJ-45 connector.The NMS interface is associated with two LEDs: Green and Amber.•LED status and their significance- OAM (NMS)

MGN Interface

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•This is an operations communication channel that directly supports a two-wire analogue telephone. •The order wire interface provides a 64 kbps voice channel between two network elements. •Voice and signaling traffic is carried over E1 or E2 bytes of the SDH overhead. •Order wire interface is terminated using RJ-45 connectors.

EOW Interface

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TROUBLESHOOTING IN TEJAS STM EQUIPMENT

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Alarm Cause Impact Action

Loss of Signal (LOS) on STM port

1.The received optical signal level drops below threshold level becausea.TX/RX off or misconnectivityb.Fiber cut

1. Traffic affecting condition as data received is interpreted as 0.2. Management connectivity will be lost on interface3. Synchronization is lost if locked on that port. Traffic affecting on unprotected path

a.Make TX/RX onb.Rectify the fiber

Loss of Frame (LOF) on STM port

a. Excessive attenuation

b. Dirty optical fiberc. Dirty connectorsd. Excessive optical

power receivede. Frame mismatch

1. Traffic affecting condition as data received is interpreted as 0.2. Management connectivity will be lost on interface3. Synchronization is lost if locked on that port. Traffic affecting on unprotected path

Clean connectors and replace fiber cablesIR

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Alarm Cause Impact Action

Trace identifier Mismatch (TIM) on STM port

1.J0 does not match the expected string because a.Incorrect connection setupb.Faulty local NE

Traffic affecting on unprotected path when this alarm is configured in NE

Proper connections to be made

Signal degrade (SD) on STM port

BER 10-5 to 10-91.Faulty fiber/ dirty connector2. Faulty transmitter/NE

Traffic affecting on unprotected path if NE is configured with alarm threshold

Attend to them and rectify

Signal Fail (SF) on STM port

BER exeeds 10-3 – 10-51.Faulty fiber/ dirty connector2. Faulty transmitter/NE

Traffic affecting on unprotected path if NE is configured with alarm threshold

Attend to them and rectifyIR

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Thank you

Any ?????

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