DWDM System

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ZXWMZXWM-32 (v1.10)ZTE Corporation

System Structure Of ZXWM-32 ZXWM-

System DimensionsThree types of standard racks: 2000mm(H)800mm(W) 650mm(D) 2,200mm(H) 800mm(W) 650mm(D) 2,600mm(H) 800mm(W) 650mm(D)

Mechanical Specifications

Standard Size and Advanced Technology

Standard 19 rack: 600mm Width v 300 mm Depth v 2200 mm Height Sub-rack: 500 mm Width v 250 mm Depth v 525 mm Height

Single Board size: 300v210mm2 Enclosed structure, with excellent electromagnetic shielding performance and heat elimination measures. Advanced SMT (Surface Mounting Technology) and multilayer PCB technology

Overall structure of ZXWM-32(V1.10) ZXWM-

OTM

OLA

OADM

OTM

ZXWMZXWM-32 (v1.10) comprises of OTM OADM OLA Optical terminal rack Optical add and drop multiplexer rack. Optical line amplifier rack

System compositionOTM equipment OLA equipment OADM multiplex equipment OTM equipment

The overall architecture of ZXWM-32 (v1.10) optical transmission system comprises the optical terminal rack (OTM), the optical line amplifier (OLA) rack and the optical add/drop multiplex (OADM) rack. Here, the optical terminal rack is composed of the optical transponder unit (OTU) sub-rack, optical amplifier (OA) sub-rack, ODF sub-rack; the optical line amplifier rack is composed of the optical amplifier (OA) sub-rack and dispersion compensation unit; and the optical add/drop multiplex (OADM) rack is composed of the optical transponder unit (OTU) sub-rack, optical amplifier (OA) sub-rack and dispersion compensation unit.

System configuration of ZXWM-32 ZXWMG.692 OTU OTU OTU

P1 P2Multiplexer EDFA OBA EDFA OLA EDFA OPA Demultiplexer

P1 P2 P3 Pn P1 P2 P3 PnMultiplexer Demultiplexer

OTU OTU OTU

P3

...OTU OTU OTU OTU

...OTU OTU OTU OTU

Pn P1 P2 P3

...OTU

...OTU

Pn

System configuration of ZXWM-32 with OSC ZXWM-

2.5GSDHOTU

2.5GSDH O OA M U O D U OA O M UOTU

2.5GSDH OTU

M U

O D U

OA

O D U OTU

2.5GSDH

OSC 2.5GSDHOTU

OSC

OSCOTU

2.5GSDH

O 2.5GSDH OTU

O O D U O M U O D U O M U M OA UOTU

D U OA

2.5GSDH

OA

Technical Specifications

Principle diagram of the ZXWM-32 (V1.10) DWDM optical transmission system ZXWMWDM terminal S1 S2 P P OMUOTUn-1 Sn-1 PR

WDM optical line amplification EDFA FA OMU S' ODU PA MPI-R OMC

WDM terminal SD1 R R

OTU 1 OTU 2

EDFA PA BA OMU MPI-S OMC OSC RX/TX G.652 optical fiber R' ODU

EDFA LA LA

SD2 ODU

SDn-1 Rn-1 SDn OSC RX/TX Rn

OTU n R

Sn

PR

OSC RX/TX optical monitoring channel EDFA LA

G.652 optical fiber

R R

SD1 SD2 ODU EDFA FA PA ODU MPI-R S'

P EDFA PA OMU MPI-S BA OMU P

S1 S2

OTU 1 OTU 2

LA OMU ODU R'

Rn-1 Rn

SDn-1 SDn

PR Sn-1 OTUn-1

PR

Sn OTU n R

Structure of the optical transponder unit (OTU) subrackFan box O T U 1 O T U 2 O T U 3 O T U 4 O T U 5 O T U 6 O T U 7 O T U 8 O T U 9 O T U 10 11 12 O M / D U 13 14

O pt cal fi i ber w i ng area ri

Structure of the optical amplifier (OA) sub-rackPublic interface area N C P 8 Fans Optical fiber connection area

O

O

O

O

O

O

O

O

M /D U 1 2 3 4

T U 5

W

S C

S C 9

T U 10 11

B A 12 12

P A 14

6

7

Introduction to boards

Boards we have in ZXWM_32 (V1.10)Optical transponder unit (OTU) Optical multiplex unit (OMU) Optical demultiplexer unit (ODU) Optical amplifier (OA) Optical supervision channel board (OSC) Order-wire phone (OW) Net control processor (NCP)

Mechanical Specifications

Terminal Rack

Mechanical Specifications

OLA Rack

Power Supply Alarm Box Fan Box O T U T 11 2

Population Diagram for TerminalO T U T 713 14

Powe r Supply Alarm Box Fan Box O T U R 11 2

O T U T 23 4

O T U T 35 6

O T U T 47 8

O T U T 59

O T U T 610 11 12

O T U R 23 4

O T U R 35 6

O T U R 47 8

O T U R 59

O T U R 6

O T U R 7

10 11 12 13 14

O ptical Fibe r Wiring Area Public Inte rface O O N T O S OBA OPA U C W C T P T 91 2 3 4 5 6 7 8 9

O ptical Fibe r Wiring Are a Public Interface O T U R 81 2 3 4 5 6 7

O T U T 9

O M U

N C P

O T U R 99

O D U

10 11 12

13 14

8

10 11 12 13 14

Fan Box O ptical Fibe r Wiring Area Fan Box O T U T 1 01 2

Fan Box O ptical Fibe r Wiring Are a Fan Box O T U R 1 0 O T U R 1 12 3 4

O T U T 1 13 4

O T U T 1 25 6 7 8 9 10 11 12 13 14

O T U 1 25 6 7 8 9 10 11 12 13 14

1

O ptical Fibe r Wiring Area O DF Subrack

O ptical Fibe r Wiring Are a O DF Subrack

Optical transponder unit (OTU)

Optical receiving (O/E)

Specific-wavelength Optical transmitting (E/O)

G.692

B1/J0 check

Check control circuit

Schematic diagram of OTU

Functions:* Transform the electrical signals into the required optical signals meeting the G.692 requirements. * Employ the optical/electrical/optical conversion mode to realize wavelength conversion. * Reports the related supervision information of the transmitting and receiving modules, and B1 and J0 bytes of the SDH signals to the NMS, which will control the OTU output wavelength, power and J0 byte.

Optical transponder unit with the FEC function OTUF

Optical receiving (O/E)

Specific-wavelength Optical transmitting (E/O)

G.692

FEC coding/decoding B1/J0 check

Check control circuit

Functions:* To employ the optical/electrical/optical conversion mode to realize wavelength conversion, meeting the G.692 requirements. * Reports the related supervision information of the transmitting and receiving modules, and B1 and J0 bytes of the SDH signals to the NMS, which will control the OTUF output wavelength, power and J0 byte. * B1 and J0 byte check circuit and monitoring circuit. * Follows REED SOLOMON Coding method for Forward error Correction (FEC)

System Components and Specifications System ComponentsOMU (Optical Multiplexing Unit)

The indicators of the OMU front panel are 1. ALM (red): 2. NOM (green):

the alarm indicator. the normal work indicator.

Dimensions of the OMU board are 300mm210mm120mm. The interfaces of the OMU front panel are: 1. CHn: 2. OUT: 3. MON:

32 optical input interfaces (SC/PC connector); optical output interface (SC/PC connector); local optical monitoring interface

Optical multiplex unit (OMU)

Optical channel input 1 Optical channel input 2

P1 P2M ultiplex optical output interface M ultip lexer

Optical channel input 40

P 40

Optical power monitoring

Online monitoring interface

Check and control circuit

Functions:* Combine optical signals with different wavelengths to one fiber: * Monitor the total output optical power and report it to the NMS. * Multiplexes 8-waves, 16-waves, 32-waves and 40-waves.

System Components and Specifications System ComponentsODU (Optical Demultiplexing Unit)

The indicators of the ODU front panel are 1. ALM (red): 2. NOM (green):

the alarm indicator. the normal work indicator.

Dimensions of the ODU board are 300mm210mm120mm. The interfaces of the ODU front panel are: 1. CHn: 2. Input: 3. MON:

32 optical Output interfaces (SC/PC connector); optical input interface (SC/PC connector); local optical monitoring interface

Optical demultiplexing unit (ODU)P1 P2

1:40D em ult ip lex er

Optical channel output 1 Optical channel output 2

Multiplex optical input

P 40

Optical channel output 40 Online monitoring interface

Optical power monitoring

Check and control circuit

Functions:* Provides the demultiplex function, i.e. optical signals of different channels in a fiber are separated from each other through the demultiplexer and then sent to different optical receivers. * demultiplexes 8-wave, 16-wave, 32-wave and 40-wave.

Optical amplifier (OA)1550 1550 Line output

1510/1550 demultiplexer

EDFA gain block

1/99 decoupler

1510/1550 multiplexer

Line input

1510

1510 Local monitoring interface Check control circuit

*The OA board is equipped with the erbium-doped fiber amplifier (EDFA) which is mainly used to amplify optical signals. *It replaces the original electrical relay mode (via the optical-electric-optical conversion process) so as to save system costs and reduce the system complexity. *According to the differences of their functions and positions in the system, OA boards are of three types, OBA, OLA, and OPA.

Functions:* Gain adjustment, gain locking, and power suppression and control, etc., thus to realize power adjustment and channel balancing. * For security requirements, the OA board provides the function of automatic power shutdown (APSD) or automatic power reduction (APR) and the restart function. That is to say, it can reduce the output optical power of one amplifier at the up stream and all amplifiers within the regeneration section at the down stream. When the signals are recovered, the optical amplifier will recover its work. As a result, it can be ensured that both optical power and levels can stay within the security requirements even in the shutdown state.

1510/1550 OMU and ODU are also installed in the OA board (there is only OMU for OBA, while there is only ODU for OPA), thus to realize the A/D of optical signals of the supervision channel wavelength (1510nm). The OA board does not process 1510nm supervision signals.

OBA PanelGreen (normal working indicator) Red (alarm indicator) Line input interface

Line output interface

Local monitoring output interface

1510 input interface

OLA PanelGreen (normal working indicator) Red (alarm indicator) Line intput interface Line output interface Local monitoring output interface

1510 input interface 1510 output interface

OPA PanelGreen (normal working indicator) Red (alarm indicator) Line inp ut interface

Line output interface

Local monitoring output interface

1510 output interface

Optical supervision channel board (OSC)1510nm optical input Optoelectrical conversion Code pattern conversion

Control and communication circuit

Data processing

1510nm optical output

Optoelectrical conversion

Code pattern conversion

Functions:* Receives 1510nm optical supervision signals from the adjacent NE and sends them to the NCP, OHP after the opto electrical conversion, code pattern conversion and de-scrambling processing respectively; at the same time, receives electrical signals from the NCP, OHP and sends them to the adjacent NE after the generation of the 1510nm optical signals with supervision information through framing, scrambling, code pattern conversion and electrical-optical conversion.

Classification:* According to different requirements, there are 2 kinds of OSC boards, i.e., the terminal optical supervision channel board (OSCT) and the line optical supervision channel board (OSCL), which can be respectively employed to process unidirectional supervision signals or bi-directional supervision signals. By employing the dual-line optical supervision channel board (OSCL), supervision signals of 4 directions can be processed simultaneously.

Green (normal working indicator) Red (alarm indicator)

OSCT Panel

Optical input interface

Optical output interface

OSCL PanelGreen (normal working indicator) Red (alarm indicator)

Optical input interface 1

Optical output interface 1

Optical input interface 2

Optical output interface 2

Overhead processor (OW)DTMF

2-wire interface 1

SLIC

CODEC Signal tone generation CODEC

Space division switching

Data processing

2-wire interface 2

SLIC

DTMF

Traffic signaling generation module Group addressing call module

4 channels

Functions:* Implements order wire communications between sites. It has three calling modes 1.address calling mode 2.group calling mode 3.broadcasting calling mode

OW PanelGreen (normal working indicator) Red (alarm indicator)

NE Control Processor (NCP)

CPU

RAM

Test interface

External I/O

f interface

Qx interface

F interface

S interface

ECC interface

* NCP collects and processes alarm and performance information of the local NE. * Provides the ability to store the configuration data. * Provides F, Qx and f interfaces to the upper layer management system. * Provides ECC interfaces for communications with other NEs * Provides S interface for communications with MCUs.

Green (normal working indicator) Red (alarm indicator)

NCP Panel

RS232 interface

Reset button

Connectors: 1. FC/PC connector:The FC Connectors are fiber optic connectors designed to minimize assembly time in the field and in production environments. The connectors feature pre-assembled, one-piece construction and offer the user the added feature of a key-adjustment mechanism. The bodies are machined in nickel-brass and include a single mode grade, zirconia ceramic, pre-dome ferrule with a concentricity of less than 1.0m.

These connectors have been utilized to interface external inputs from ODF. 2. SC/PC connector:

The SSC-PE Series SC/PC Connectors are fiber optic connectors designed to minimize assembly time in the field and in production environments. The connectors feature pre-assembled, one-piece construction with push-pull coupling and offer the user the added feature of a key-adjustment mechanism. The bodies consist of a lightweight, compact plastic housing and include a single mode grade, zirconia ceramic, predome ferrule with a concentricity of less than 1.0m. The new series accommodates 3mm, 2mm, and 0.9mm fiber types (Dimensions in mm).

These connectors have been utilized for internal wiring of the system

System Wiring

Optical Wiring Diagram for a 32 Channel System Trans Terminal Rack

System Wiring

Optical Wiring Diagram for a 32 Channel System Receive Terminal Rack

System Wiring

Optical Wiring Diagram for a 32 Channel System Optical Amplifier Rack

Electrical Specifications of the SystemPower supply and power consumption of equipmentPower Supply Requirement Input voltage: -48V(-40V~ -60V)DC, positive pole grounding. Equipment power consumptionFull Name Optical Transponder Unit with FEC Optical booster amplifier Optical preamplifier Optical line amplifier Optical Supervisory Channel Optical Multiplexing Unit: Optical De-multiplexing Unit(AWG): Optical De-multiplexing Unit: Optical add and Drop Multiplexer Optical protection board Optical performance monitoring board Order Wire Network Control Processor (NCP) Board Power supply and alarm board Fan unit Optical transponder unit (OTU) sub-rack Optical Amplifier (OA) sub-rack DWDM terminal rack (32 wavelength) DWDM optical line amplifier rack Abbr. OTUF OBA OPA OLA OSC OMU ODU ODU OAD OP OPM OW NCP WARN power consumption (W) 16 10 8 10 8 5 25 5 5 10 15 5 10 15 18 242 62 619 77

Board

Sub-rack

Rack

System Structure and Working Principle8 to 28 dbm 0 to 18 dbm

WDM terminal1 to 3 dbm

WDM optical line amplification EDFA EDFAOptical Line Amplifier

WDM terminal EDFAOptical pre_amplifer

OTUT 1FC-SC

S1 S2SC-SC

P P OMUSC-SC -5

SD1 R SD2 R 2 db

1 to 3 dbm

OTUR1 OTUR2

Optical Booster to Amplifier 8

OTUT2

+16 to +20

-2 to 8

16 to 20

-2 to 8

OMU OBA MPI-SSC-PCSn-1 PR

ODU R'

OLA

OMU S'

ODU MPI-R

12 db

OPA

ODU SDn-1 Rn-1 OTURn-1 OTURn

OTUT n-1 OTUT n R

OSC RX/TX

Sn

PR O S C

10 db

SDn Rn

OSC RX/TX

G.652 optical fiber

OTUR1 OTUR2

R R

SD1 SD2 ODU OPA ODU MPI-R EDFA SDnOptical pre_amplifer

OSC RX/TX Optical Supervisory Channel

G.652 optical fiber

O S C P P S1 OTUT 1 S2 OTUT2

OLA OMU S' EDFAOptical Line Amplifier

OTURn-1 OTURn

Rn-1 SDn-1 Rn

ODU R'

OMU MPI-S

OBA

OMUPR Sn-1

EDFAOptical Booster Amplifier

OTUT n-1 PR Sn OTUT n R

OMU O/P Power p = +2 16 +10 log n, n is that number of lamda loaded For n = 18, p = -1.44 ( -2 ) We get 5 db I/p of any amplifier should not be more than 2 db otherwise pad is to be used for bring it to the desired range I/P of any amplifier should be ideally 5 to have a flat gain