Zte Unitrans ZXMP M600 Technical Instructions

ZXMP M600 (V1.0)

Metro CWDM Equipment

Technical Manual

ZTE CORPORATION

ZXMP M600 (V1.0)

Technical Manual

Manual Version 20050425-R1.0
Product Version V1.0

Copyright © ZTE Corporation

All rights reserved.

No part of this documentation may be excerpted, reproduced, translated, annotated or

duplicated, in any form or by any means without the prior written permission of ZTE

Corporation.

ZTE CORPORATION

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Website: http://www.zte.com.cn

Postcode: 518057

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Preface

About This Manual

This manual is applicable to Unitrans ZXMP M600 (V1.0) Metro CWDM Equipment

(ZXMP M600 for short).

The ZXMP M600 is a wavelength division equipment belonging to the metropolitan

area optical network product series developed by ZTE. This equipment is capable of

transparently transmitting signals at various rates and services. It features high optical

transmission capacity and fully satisfies users’ requirements on networking and

management. Therefore, this equipment is applicable to various layers in

small-/medium-sized Metropolitan Area Network (MAN), the convergence layer and

access layer of a large-sized MAN.

The equipment has four accompanying manual, including:

Unitrans ZXMP M600 (V1.0) Metro CWDM Equipment Technical Manual

Unitrans ZXMP M600 (V1.0) Metro CWDM Equipment Hardware Manual

Unitrans ZXMP M600 (V1.0) Metro CWDM Equipment Installation Manual

Unitrans ZXMP M600 (V1.0) Metro CWDM Equipment Maintenance Manual

How to Use This Manual

Unitrans ZXMP M600 (V1.0) Metro CWDM Equipment Technical Manual deals

with the architecture, technical indices, system functions, configuration and networking

of the ZXMP M600. It enables users to get a comprehensive understanding of the

ZXMP M600 and serves as a basis for the users to read other relevant documents.

Chapter 1 System Overview briefs the background, applicable standards, system

structure and features of the ZXMP M600.

Chapter 2 Technical Indices describes various technical indices of the ZXMP-M600

in detail.

Conventions

Chapter 3 System Functions deals with the functions of the ZXMP M600 and their

implementation, including the transmission function, Service multiplexing function and

protection function.

Chapter 4 System Configurations and Networking Modes introduces the

networking modes supported by the ZXMP M600, the system configuration

requirements and networking examples. It enables the users to understand the

networking capability and service providing capability of the equipment.

Appendix A Explanation of Terms provides a brief explanation to some terms

adopted to facilitate understanding the manual.

Appendix B Abbreviations summarizes the English abbreviations and terms in the

manual for readers’ reference.

1. Notational convention

Angular brackets “<and>” identify names of keys and buttons, and the

information typed by an operator from a terminal

Square brackets “[and]” indicate a man-machine interface, menu item, data list

or field name. The symbol “→” separates a multi-level menu, e.g., [File→

New→ Folder] indicates the [Folder] menu item under the [New] submenu of

the menu [File].

2. Keyboard Operation Convention

Format Description

Characters within

angular brackets

<Key 1+Key 2> Press Key 1 and Key 2 at the same time.

<Key 1, Key 2> Press Key1 first. Then release Key 1 and press Key 2

Indicate a key or button name, e.g., <Enter>, <Tab>, <Backspace>, and

<a>

3. Mouse Operation Convention

Format Description

Click

Double-click

Right-click

Drag Refers to pressing and holding a mouse button and move the mouse

Refers to clicking the primary mouse button (usually the left mouse

button) once

Refers to quickly clicking the primary mouse button (usually the left

mouse button) twice

Refers to clicking the secondary mouse button (usually the right mouse

button) once.

4. Danger, Warning, Caution and Note Statements

Danger, Warning, Caution and Note statements are

used throughout this manual to emphasize important and critical information. You must

read these statements to help ensure safety and to prevent product damage. The

statements are defined below.

Danger:

Indicates an imminently hazardous situation which, if not avoided, will result in death

or serious injury. This signal word is to be limited to the most extreme situations.

Warning:

Indicates a potentially hazardous situation that, if not avoided, could result in death or

serious injury.

Caution:

Indicates a potentially hazardous situation that, if not avoided, could result in minor or

moderate injury. It may also be used to alert against unsafe practices.

Note:

A Note statement is used to notify people of installation, operation, or maintenance

information that is important, but not hazard-related.



 Tips:



Indicates a suggestion or hint to make things easier or more productive for the reader

Statement: The actual product may differ from what is described in this

manual due to frequent update of ZTE products and fast development of

technologies. Please contact the local ZTE office for the latest updating

information of the product.

Contents

1 System Overview.....................................................................................................................................1-1

1.1 System Background .......................................................................................................................1-1

1.1.1 MAN ...................................................................................................................................1-1

1.1.2 Wavelength Division Multiplexing Technique....................................................................1-4

1.2 System Structure ............................................................................................................................ 1-6

1.2.1 Structure of Hardware System ............................................................................................1-6

1.2.2 Structure of Network Management Software System......................................................... 1-9

1.3 System Features ...........................................................................................................................1-12

1.4 Applicable Standards/Recommendations.....................................................................................1-14

2 Technical Indices .....................................................................................................................................2-1

2.1 System Indices ...............................................................................................................................2-1

2.2 Structure Indices.............................................................................................................................2-2

2.3 Power Indices................................................................................................................................. 2-3

2.3.1 Voltage Requirements .........................................................................................................2-3

2.3.2 Power Consumption Requirements.....................................................................................2-3

2.4 Environment Requirements............................................................................................................ 2-4

2.4.1 Grounding Requirements.................................................................................................... 2-4

2.4.2 Temperature and Humidity Requirements...........................................................................2-4

2.4.3 Cleanness Requirements .....................................................................................................2-5

2.4.4 Dustproof and Anti-corrosion Requirements ......................................................................2-5

2.5 Working Wavelengths ....................................................................................................................2-5

2.6 Reliability.......................................................................................................................................2-6

-i-

2.7 Optical safety and electrical safety ................................................................................................ 2-6

2.8 Indices of System Component Parts .............................................................................................. 2-7

2.8.1 Performance Indices of OMD............................................................................................. 2-7

2.8.2 Performance Indices of OAD Units.................................................................................... 2-8

2.8.3 OTU Interface Indices ...................................................................................................... 2-10

2.8.4 Performance Indices of Optical Supervisor Channel........................................................ 2-13

2.8.5 SRM42 Interface Indices .................................................................................................. 2-13

3 System Function...................................................................................................................................... 3-1

3.1 Line Transmission Function .......................................................................................................... 3-1

3.2 Service Functions........................................................................................................................... 3-2

3.2.1 Service Access Function..................................................................................................... 3-2

3.2.2 Service Convergence Function ........................................................................................... 3-2

3.3 Communication and Monitoring Functions................................................................................... 3-3

3.3.1 Communication between EMS and Access Point............................................................... 3-3

3.3.2 Communication between Nodes ......................................................................................... 3-5

3.3.3 Intra-node Communication and Monitoring ....................................................................... 3-6

3.4 Power Input and Output Functions ................................................................................................ 3-7

3.5 Grounding Function....................................................................................................................... 3-7

3.6 Alarm Output Function.................................................................................................................. 3-7

3.7 Protection Function........................................................................................................................ 3-8

3.7.1 Ring Network Protection .................................................................................................... 3-8

4 System Configurations and Networking Modes................................................................................... 4-1

4.1 System Configuration.................................................................................................................... 4-1

4.1.1 Board Slot Resources.......................................................................................................... 4-1

4.1.2 Metro Optical Terminal Equipment (OTM)........................................................................ 4-2

-ii-

4.1.3 Metro OADM Equipment (OADM) ...................................................................................4-2

4.2 Networking Mode .......................................................................................................................... 4-2

4.2.1 Point-to-point Networking ..................................................................................................4-2

4.2.2 Chain Networking...............................................................................................................4-2

4.2.3 Ring Networking.................................................................................................................4-2

4.2.4 Ring-to-chain Networking ..................................................................................................4-2

4.3 Configuration Example..................................................................................................................4-2

4.3.1 Configuration Implementation ............................................................................................ 4-2

4.3.2 Application Features............................................................................................................4-2

Appendix A Term Description..................................................................................................................A-2

Appendix B Abbreviations ....................................................................................................................... B-2

-iii-

List of Figures

Fig. 1.1-1 Basic Structure of MAN...................................................................................................1-3

Fig. 1.2-1 Functional Structure of the ZXMP M600 Equipment ......................................................1-6

Fig. 1.2-2 Functional Structure of OTM Equipment.........................................................................1-8

Fig. 1.2-3 Functional Structure of OADM Equipment .....................................................................1-8

Fig. 1.2-4 Structure of the Network Management Software System.................................................1-9

Fig. 2.8-1 Optical Interfaces of OMD Units .....................................................................................2-7

Fig. 2.8-2 Optical Interfaces of OAD Units......................................................................................2-8

Fig. 3.3-1 Connection between the Access Point and the EMS (through an Ethernet interface)...... 3-3

Fig. 3.3-2 Connection with the EMS Through SDH Equipment ......................................................3-4

Fig. 3.3-3 Connection with the EMS through RS232 .......................................................................3-5

Fig. 3.3-4 Intra-node Communication and Monitoring Channel.......................................................3-6

Fig. 3.7-1 1+1 Protection of Optical Channel on a Ring Network.................................................... 3-8

Fig. 4.1-1 Slot Distribution in the CWU Shelf..................................................................................4-1

Fig. 4.1-2 Slot Distribution in the SMU Shelf ..................................................................................4-2

Fig. 4.1-3 Board Configuration of OTM Equipment (which adds/drops 8 wavelengths).................4-2

Fig. 4.1-4 Fiber Connection of OTM Equipment (1310nm monitoring channel)............................. 4-2

Fig. 4.1-5 Board Configuration of OADM Equipment (which adds/drops 3 wavelengths)..............4-2

Fig. 4.1-6 Fiber Connections of OADM (which adds/drops 3 wavelengths)....................................4-2

Fig. 4.2-1 Application of Point-to-point Networking........................................................................4-2

Fig. 4.2-2 Application of Chain Networking ....................................................................................4-2

Fig. 4.2-3 Application of Ring Networking ...................................................................................... 4-2

Fig. 4.2-4 Application of Ring-to-chain Networking........................................................................4-2

-i-

Fig. 4.3-1 Networking in a Typical Configuration Example ............................................................ 4-2

Fig. 4.3-2 Service Requirements....................................................................................................... 4-2

Fig. A.9-1 Optical Transmission Over Interface Made of Uneven Media....................................... A-2

Fig. A.9-2 Optical Dispersion Over a Fiber..................................................................................... A-2

-ii-

List of Tables

Table 2.2-1 Outline Dimensions and Weight Indices of the ZXMP M600 Component Parts...........2-2

Table 2.3-1 Power Consumption Indices of the ZXMP M600 Boards/Units....................................2-3

Table 2.4-1 Temperature and Humidity Requirements .....................................................................2-5

Table 2.5-1 Wavelength Distribution of the ZXMP M600 Equipment (with ordinary fibers adopted)

.............................................................................................................................................................2-6

Table 2.8-1 Performance Indices of OMD........................................................................................ 2-8

Table 2.8-2 Performance Indices of OAD Units ............................................................................... 2-9

Table 2.8-3 Indices of the Line End Optical Transmitting Port ......................................................2-10

Table 2.8-4 Indices of the Line End Optical Receiving Port...........................................................2-11

Table 2.8-5 Indices of Client Optical Transceiving Module ...........................................................2-12

Table 2.8-6 Major Performance Indices of Optical Monitoring Channel........................................2-13

Table 2.8-7 Indices of Client Optical Transceiving Module ...........................................................2-14

Table 4.1-1 Relation between the Boards and Slots in the CWU Shelf ............................................4-1

Table 4.1-2 Relation between the Boards and Slots in the SMU Shelf.............................................4-2

Table 4.3-1 Equipment Configuration...............................................................................................4-2

-i-

1 System Overview

This chapter introduces the background, architecture, system features and applicable

standards/recommendations. It aims at laying a basis for readers to understand the

equipment.

1.1 System Background

The ZXMP M600 is the metro CDWM system developed by ZTE. It features large

optical transmission capacity and can implement transparent transmission of various

services at multiple rates. It can be applied to the convergence and access layers of

large MANs as well as various layers of middle- and small-sized MANs.

In the following, the Metropolitan Area Network (MAN) and Wavelength Division

Multiplexing (WDM) will be introduced briefly.

1.1.1 MAN

1.1.1.1 Concept

As data services such as IP and Ethernet services develop rapidly in recent years, a data

network that can provide wide coverage, high-speed bandwidth and convenient

services is required for providing services such as Internet access, IP-based virtual

private network, IP phone, multimedia application and e-commerce. Meanwhile, as a

metropolis features prosperous economy, dense population, compact coverage area and

frequent information exchange, the information-oriented construction keeps developing

rapidly. Thus, the requirements on MAN also becomes higher and higher.

Generally a MAN is considered as a broadband network that has a unified protocol and

connects government departments, educational and scientific institutions, companies

and home users. It provides data services as well as integrated multimedia services

such as packet voice, graphic and video services, and covers local public networks in

metropolitan and suburb areas.

Based on the statistics and packet technology, the MAN boasts of a clear network

structure, perfect expandability and high reliability. The products and technologies

1-1

ZXMP M600 (V1.0) Technical Manual

adopted in it are widely used for commercial purposes, while the user and service

management is flexibly and convenient. The MAN features broadband capacity and

rate, efficient transmission of information and diversified access methods. It obtains the

contents locally, offers user-defined access, provides characteristic services and can

deploy new services quickly. In addition, its capacity can be expanded flexibly and its

upgrade and development can be predicted.

1.1.1.2 Basic Structure

The MAN can either be divided vertically or horizontally:

1. Vertical division

The MAN can be vertically divided into the access layer, convergence layer and

core layer.

The access layer accesses different types of subscribers such as routers and LAN.

The convergence layer converges sporadic access points, implements data

multiplexing, transmitting and switching, and provides traffic control and user

management functions. It includes Multi-Service Transmit Platform (MSTP) and

Metro OADM. The core layer implements high-speed information exchange on

the whole network as well as interconnection between backbone networks. It

generally consists of OADM equipment.

1-2

Chapter 1 System Overview

Fig. 1.1-1 shows the basic structure of a MAN.

Backbone layer

MOADMMOADM

Core layer

MOADM

Convergence

layer

MSTP

MSTP

Access layer

Router

MSTP: multi-service transmit platform OADM: metro OADM

Fig. 1.1-1 Basic Structure of MAN

LAN

MSTP

ATM

2. Horizontal division

A MAN can also be horizontally divided into the service layer and transmission

layer.

The service layer can implement multiple services such as narrowband voice

service, Internet service, remote calculation and transaction processing,

e-commerce, video conference, multimedia integrated information service,

remote communication and control through computer and leased line service. It

consists of various ATM and IP devices. The transmission layer indicates the

metro optical network that carries the services at the service layer. It provides an

efficient and a unified transmission platform that features large capacity and low

cost and consists of WDM and SDH devices.

Service and

management

center

1-3

ZXMP M600 (V1.0) Technical Manual

1.1.1.3 Features of Metro Optical Network

1. Large service access capacity

The rapid development of MAN service causes the acute increase in the demand

for bandwidth. This demand can only be met by large-capacity metro optical

network. Thus, the core layer of the metro optical network should have large

service access capacity and should be capable of continuous upgrading.

2. Multi-service convergence and transparent transmission

To make full use of the existing network resources, the core layer should be able

to converge various low-rate services and encapsulate services of different rates

and with different protocols into a single wavelength. This helps save the

wavelength resources and economize network construction. On the other hand,

to avoid extra overhead due to protocol conversion and frame format matching

and to make full use of the bandwidth resources, the core layer is also required

to transmit the carried services in the original mode.

3. High reliability and powerful network protection capability

The network security and reliability guarantee normal service transmission.

Thus, redundancy protection measures should be provided for the hardware on

the equipment. Besides, channel protection and multiplex section protection

should also be provided at various levels on the network.

4. Low networking cost

1.1.2 Wavelength Division Multiplexing Technique

As MAN services become increasingly abundant, the requirement on the MAN

capacity becomes higher and higher. As a result, the multi-service broadband MAN

gradually becomes a hotspot in the telecom and network construction. To use the

existent optical fiber resources to increase the bandwidth capacity, the Wavelength

Division Multiplexing (WDM) technique is adopted in the MAN.

WDM can be divided into Dense Wavelength Division Multiplexing (DWDM)

technique and Coarse Wavelength Division Multiplexing technique.

1.1.2.1 DWDM Technique

The DWDM technique adopts an Erbium Doped Fiber Amplifier (EDFA), a high

wavelength stability laser and dense wavelength division multiplexing/ demultiplexing

1-4

Chapter 1 System Overview

equipment to transmit optical signal service and implement balanced management of

optical power on the whole line. In the DWDM system, the selection of wavelength

and the frequency intervals should conform to ITU-T Recommendation G.692.

The working wavelength range of the DWDM system is 1528.77nm~1560.61nm and

the corresponding working frequency range is 196.1THz~192.1THz.

The channel interval of the system is a multiple of 100GHz (about 0.8nm). The smaller

the channel interval is, the higher the resolution of the optical demultiplexer should be.

The channel interval commonly used at present is either 200GHz (about 1.6nm) or

100GHz (about 0.8nm).

While saving the cost of the electrical relay, EDFA technique adopted in the DWDM

equipment presents much higher requirements on the wavelength stability, dispersion

tolerance and chirp performance of the laser.

Therefore, if the DWDM equipment that suitable for long distance transmission is used

in a MAN that features short transmission distance and diversified service interfaces,

the network construction cost will greatly increase.

1.1.2.2 CWDM Technique

The CWDM technique is developed to improve the utility of optical fibers on the MAN,

to provide multiple service interfaces and to cut the network construction cost at the

same time.

The working principle of CWDM is similar to that of DWDM. At the transmitting end

of the link, an optical multiplexer is used to multiplex the wavelengths transmitted in

different fibers into one fiber for transmission, while at the receiving end, a

demultiplexer is used to recover the original wavelengths from the combined

wavelength.

The wavelength selection and channel interval of the CWDM conforms to ITU-T

Recommendation G694.2. The wavelength interval is 20 nm, while the working

wavelength range is determined by the adopted fiber type. If an ordinary fiber type

G.652 A&B is adopted, then the working wavelength range is 1470nm~1610 nm; if

full-wave fibers, that is, G.652 C&D fibers are adopted, then the working wavelength

range is 1270 nm~1610 nm.

1-5

ZXMP M600 (V1.0) Technical Manual

The CWDM system adopts uncooled laser and multiplexer/demultiplexer. Compared to

DWDM, it boasts shorter transmission distance and lower cost and is suitable for the

construction of MAN.

1.2 System Structure

The structure of the ZXMP M600 equipment is shown in Fig. 1.2-1.

Fig. 1.2-1 Functional Structure of the ZXMP M600 Equipment

The ZXMP M600 equipment can be divided into the hardware system and network

management software system. The two systems are independent of each other but will

also work together.

1.2.1 Structure of Hardware System

1.2.1.1 Platform Functions

The hardware system of the ZXMP M600 includes an optical transfer platform, service

convergence system, multiplexing/demultiplexing platform, monitor platform and

power supply platform.

1. Optical transfer platform

It adopts the optical/ electrical/ optical conversion mode to implement

wavelength conversion of service signals and line signals.

The service signals include multi-service signals with a rate lower than 2.5Gbit/s

and with the maximum rate being 2.5Gbit/s.

1-6

Chapter 1 System Overview

The line signals meet the requirements specified in ITU-T recommendation

G.694.2.

2. Service convergence platform

It converges multiple channels of low rate signals into one wavelength for

transmission and implements the reserve process.

The low rate signals include standard STM-1, STM-4 signals with the maximum

rate being 2.5Gbit/s on the line.

3. Multiplexing/demultiplexing platform

It includes a multiplexing part and a demultiplexing part.

1) Multiplexing part: It couples multiple channels of optical signals with different

wavelengths from the optical transfer platform and service convergence platform

to a piece of optical fiber for transmission.

2) Demultiplexing part: It divides the multiplexing optical signals from the line

side according to their different wavelengths and sends them to different optical

transfer platform and service convergence platform.

4. Monitor platform

1) Collecting, processing and reporting the configuration, alarm and performance

information of the various platforms

2) Receiving the command from the EMS and transferring it to the destination

board

3) Using a specified monitoring optical channel to transparently transmit the

network management information. The wavelength of the monitoring channel

can be either 1310nm or 1510nm.

5. Power supply platform

It converts in DC input into +5V or -48V DC power to provide power for

various platforms.

Options –48V, +24V and –60V are available for DC power supply, and 1+1

warm backup are practicable.

1-7

ZXMP M600 (V1.0) Technical Manual

1.2.1.2 System Configuration

The ZXMP M600 can either be configured as OTM equipment or OADM equipment.

1. OTM

The OTM can add/drop all services and implement functions of a line terminal

node. When the ZXMP M600 is configured as OTM equipment, the relation

among the platforms is shown in Fig. 1.2-2.

Service signal

Service signal

Optical transfer

platform

Service

con vergence

pl atform

Monitor platform

Multiplexing

Demultiplexing

Multiplexing/

demultiplexing pl atform

Optical line

Fig. 1.2-2 Functional Structure of OTM Equipment

2. OADM

The OADM equipment can add/drop services with specified wavelengths and

directly connect other services. When the ZXMP M600 is configured as OADM

equipment, the relation among the platforms is shown in Fig. 1.2-3.

Multiplexing/ demultiplexing

platform

Optical line

(B side)

Optical line

(A side)

demultiplexing platform

Multiplexing/

Motor

platform

Crossover cable

Optical transfer

platform

Service signal

Service convergence

platform

Service signal

Fig. 1.2-3 Functional Structure of OADM Equipment

1-8

Chapter 1 System Overview

1.2.2 Structure of Network Management Software System

The ZXMP M600 adopts Unitrans ZXONM E300 element management system

Unix/Windows (hereafter called ZXONM E300 for short) to implement software

management. The ZXONM E300 supports such functions as fault management,

performance management, security management, configuration management,

maintenance management and system management.

It consists of four layers, including an equipment layer, a Network Element (NE) layer,

NE management layer and subnet management layer and can provide Corba interface

to the network management layer.

Fig. 1.2-4 shows the structure of the ZXONM E300 system.

Network

management layer

Subnet

management layer

Network

element

management

layer

ECC

NE/Agent

ECC

Network

management layer

Equipment layer

MCU MCU

GUI(Cient)

F

Network element/ subnet

management system

Manager 1

Q

x

GNE/Agent

NE/Agent

……

ECC

NE/Agent

ECC

SS

GUI(Cient)

management system

LMT

f

NE/Agent

ECC

Network

management syst em

Corba

F

Subnet

Manager 3

F

F

Network element/ subnet

management system

Manager 2

Q

x

GNE/Agent

ECC

NE/Agent

NE/Agent

SS

M CU MCU MCUMCU

……

Network

management syst em

Corba

GUI(Cient)

……

ECC

ECC

NE/Agent GNE/Agent

F

Network element/ subnet

ECC

GUI(Cient)

FF

management system

Manager n

Q

x

S S

……

Fig. 1.2-4 Structure of the Network Management Software System

1-9

ZXMP M600 (V1.0) Technical Manual

1. Layer description

1) Equipment layer (MCU)

The equipment layer supports the following functions:

 Monitoring the alarm and performance of the boards

 Receiving commands from the network management system

 Controlling a board to implement specific operations.

2) NE layer, the Agent in the EMS

The NE layer supports the following functions:

 Managing a single NE

 Configuring the boards during the power-on and initialization of the NE

 Monitoring the alarm and performance of the whole NE in the normal running

status

 Receiving monitor commands from the NE management layer (Manager)

through the Gateway Network Element (GNE) and processing accordingly

3) NE management layer (Manager): to control and coordinate a series of NEs,

including the Manager, Graphical Interfaces (GUIs) and Local Maintenance

Terminal (LMT).

The NE management layer supports the following functions:

 The core of the NE management layer is the Manager (or Server). It can manage

multiple subnets at the same time, control and coordinate NE devices.

 The GUI provides graphical user interfaces to convert the users’ management

commands into the commands in the internal mode and send them to the

Manager.

 The LMT controls the user authority and software function part to implement

the simple functions of both GUI and Manager. It provides simplified NE

management function for the deployment and maintenance of the local NE.

4) Subnet management layer: Its structure is similar to that of the NE management

layer. Through the EMS of the NE management layer, the commands for

configuring and maintaining the NEs can be implemented indirectly.

1-10

Chapter 1 System Overview

The subnet management system sends the commands to the NE management

system, which then send them to the NE. After the commands are executed, the

NE sends responses to the subnet management system through the NE

management system. Besides, the NE management layer can provide Corba

interfaces to the network management layer.

2. Interface Description

1) QX interface:

In Fig. 1.2-4, it is the interface between the Agent and Manager, that is, the

interface between the NCP board and the computer where the Manager program

exists. It conforms to the TCP/IP protocol.

2) F interface:

In Fig. 1.2-4, it is the interface between the GUI and Manager, that is, the

interface between the GUI and the computer where the Manager program exists.

It conforms to the TCP/IP protocol.

3) f interface:

In Fig. 1.2-4, it is the interface between the Agent and LMT, that is, between the

NCP board and the maintenance terminal that is configured with the

corresponding network management software. The interface conforms to the

TCP/IP protocol.

4) S interface:

In Fig. 1.2-4, it is the interface between the Agent and the MCU, that is, the

communication interface between the NCP and other boards. The S interface

adopts HDLC-based point-to-point communication.

5) ECC interface

As shown in Fig. 1.2-4, it is the interface between two Agents, that is, the

communication interface between NEs. It adopts DCC to implement

communication and can support both user-defined communication protocol and

standard protocol. It implements the bridge function on the Agent.

For the detailed description of the network management software, please refer to

relevant network management manuals.

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ZXMP M600 (V1.0) Technical Manual

1.3 System Features

1. CWDM technique adopted to implement large-capacity transmission

Through an ordinary G.652 fiber, the ZXMP M600 equipment can provide 8+1

channels and the rate of each channel can reach 2.5Gbit/s. Here, “+1” indicates

the channel with a wavelength of 1310nm.

2. Open multi-service access mode

The ZXMP M600 equipment adopts an open design. It uses the optical/

electrical/ optical wavelength conversion technique to convert the accessed

optical signals into wavelength signals that conform to ITU-T Recommendation

G.694.2.

It can transparently transmit STM-N (N=1, 4, 16), POS, GbE, ATM optical

signals and can also directly access wavelength signals that conform to ITU-T

Recommendation G.694.2.

3. Service convergence capability

The ZXMP M600 can converge 4 channels of STM-1/STM-4 services to a

2.5Gbit/s channel.

4. Flexible filter design

the ZXMP M600 adopts a modular structure, supports flexible add/drop of

1~8+1 wavelengths and supports smooth upgrade.

5. Supporting multiple networking modes

The ZXMP M600 supports chain, ring and tangent networks

6. Providing multiple power access modes

The ZXMP M600 equipment can access -48V DC, +24V DC or -60V DC power

supplies.

Each subrack can adopt two power boards to implement 1+1 power hot backup

to guarantee the reliable power supply of the system.

7. Supporting the mixed plugging and hot plugging/unplugging of the boards

In the corresponding CWU and SMU shelves of the ZXMP M600 equipment, all

boards except the power board and the NCP board can be plugged in a mixed

1-12

Chapter 1 System Overview

way and can be plugged/unplugged in a hot way. This makes the configuration

flexible and the maintenance convenient.

8. Providing a powerful and unique EMS

The ZXONM E300 network management system adopted by the ZXMP M600

provides friendly and convenient user interfaces and supports the management

of the NE layer, NE management layer and network management layer. It can

implement such functions as fault management, performance management,

security management, configuration management, maintenance management and

system management. Besides, it shows the following features:

1) Adopting object-oriented technique during the design and development and

implementing 3-layered C/S structure where the interface, service and data

layers are separated one another. Thus, the system features perfect expandability

and adaptability.

2) Adopting the standard L2 Ethernet switching technique, which greatly facilitates

the construction of complicated networks

3) Implementing real-time synchronization and automatic changeover between the

data of active/standby nodes, thus greatly improving the reliability and

availability of the EMS

4) Implementing online upgrade of the foreground and background NM software as

well as the embedded software of the boards without interrupting the service

5) Managing the CWDM, DWDM and SDH equipment in a unified way.

1-13

ZXMP M600 (V1.0) Technical Manual

1.4 Applicable Standards/Recommendations

The design of the ZXMP M600 system conforms to the following recommendations

and standards:

ITU-T G.652-2003-3 Characteristics of a single-mode optical fibre cable

ITU-T G.653-2003-12 Characteristics of a dispersion-shifted single-mode optical

fibre cable

ITU-T G.655-2003-3 Characterizations of a non-zero dispersion single-mode

optical fibre cable

ITU-T G.694.2-2003-12 Spectral grids for WDM applications: CWDM wavelength

grid

ITU-T G.695-2004-2 Optical interfaces for Coarse Wavelength Division

Multiplexing applications

ITU-T G .703-2001-11 Physical/electrical characteristics of hierarchical digital

interfaces

ITU-T G.783-2000-10 Characteristics of synchronous digital hierarchy (SDH)

equipment functional blocks

ITU-T G.798-2002-06 Characteristics of optical transport network equipment

functional blocks

ITU-TG.825-2002-06 The control of jitter and wander within digital networks which

are based on the synchronous digital hierarchy (SDH)

ITU-T G.959.1 Optical transport network physical layer interfaces

ITU-T G.871 Framework for optical transport network recommendations

ITU-T G.872 Architecture of optical transport networks

ITU-T G.873 Optical Transport Networks Requirements

ITU-T G.874 Management Aspects of Optical Transport Network Element

ITU-T G.875 Optical Transport Network Management Information Model for The

Network Element View

1-14

Chapter 1 System Overview

ITU-T .957-1999-6 Optical interfaces for equipment and systems relating to the

synchronous digital hierarchy

ESCON phy layer OS390/LIBRARY

IEC 60825-1-2000 Safety of Laser Product

ISO/IEC-9314-3 Information processing systems-Fibre distributed Data Interface

(FDDI)-Part 3: physical Layer Medium Dependent (PMD)

Bellcore GR253-1999 Synchronous Optical Network (SONET) Transport Systems:

Common Generic Criteria

1-15

2 Technical Indices

This chapter introduces the technical indices of the ZXMP M600, including the

structure indices, power indices and board performance indices.

2.1 System Indices

8+1 wavelength system compliance to S-C8L1-1D2/3/5 application code of G.695

4+1 wavelength system can upgrade to 8+1 system

20Gb/s Maximum capacity (8x2.5G)

OTM and OADM nodes support P2P and ring topology

18dB link budget for 8+1 system w/o reg

20dB link budget for 4+1 system w/o reg

Fiber type G.652, G.653, G.655

Wavelengths is compliance to G.694.2

2-1

ZXMP M600 (V1.0) Technical Manual

2.2 Structure Indices

The outline dimensions and weight indices of the component parts of the ZXMP M600

are shown in Table 2.2-1.

Table 2.2-1 Outline Dimensions and Weight Indices of the ZXMP M600 Component Parts

Component Parts Outline Dimensions Weight (kg)

ZXMP M600 CWU shelf 43.6mm (H) ×441mm (W) ×241mm (D)

ZXMP M600 SMU shelf 43.6mm (H) ×441mm (W) ×241mm (D)

Fan Box 41.2mm (H) × 30.6mm (W) × 222mm (D) ——

-48V DC Power Board (PCWAS)

+24V DC Power Board (PCWBS)

-60V DC Power Board (PCWCS)

Sub-Rate Multiplexing (SRM42)

Gigabit Ethernet Multplexing Unit

(GEM2)

Net Control Processor (NCP)

Optical Transponder Unit (OTU)

Optical Dmux/Mux Unit (OMD)

Optical Add/Drop Unit (OAD)

20.4mm (H) ×110.6mm (W) ×210mm (D) ——

41.2mm (H) ×325.5mm (W) ×210mm (D) ——

20.4mm (H) ×162.6mm (W) ×210mm (D) ——

3 (empty)

7 (in full configuration)

3 (empty)

7 (in full configuration)

Note:

1. When ZXMP M600 is to be installed in a cabinet, mounting lugs should be installed on both sides of the shelf to fix the shelf to the cabinet. The

sizes of the shelf with mounting lugs are 43.6mm (H) ×482.6mm (W) ×241mm (D).

2. The “H” and “W” in the outline dimensions of the boards indicate the size of the board panel, while “D” indicates a dimension of the PCB board.

3. For the detailed description of the component parts, please see Unitrans ZXMP M600 (V1.0) Metro CWDM Equipment Hardware Manual

2-2

Chapter 2 Technical Indices

2.3 Power Indices

2.3.1 Voltage Requirements

The ZXMP M600 supports DC power supplies. Compliance to ETSI EN 300 132-2

V2.1.2 (2003-09)

1. DC power

 Rated input voltage: -48V

Fluctuation allowance: -57V~-40V

 Rated input voltage: +24V

Fluctuation allowance: +20V~+30V

 Rated input voltage: -60V

Fluctuation allowance: -75V~-45V

2.3.2 Power Consumption Requirements

The power consumption indices of ZXMP M600 boards are shown in Table 2.3-1.

Table 2.3-1 Power Consumption Indices of the ZXMP M600 Boards/Units

Board/ Unit Name Abbreviation Power Consumption (W)

Net Control Processor NCP 6.0

Power Board PCWCS/PCWAS 5.0

Optical Transponder Unit OTU 8.0

Optical Dmux/Mux Unit OMD 1.0

Optical Add/Drop Unit OAD 1.0

Sub-Rate Multiplexing SRM42 22.0

Gigabit Ethernet Multiplexing GEM2 20.0

CWDM Unit CWU 35.0 (in full configuration)

Subrate Multiplexer Unit SMU 32.0 (in full configuration)

Note: The full configuration of CWU indicates 3×OTU+1×OMD+2×PCW, while that of SMU is 1×SRM42+2×PCW.

The power consumption indices in the above table are values under normal temperature.

In practice, a certain power redundancy should be provided to ensure the reliable

2-3

ZXMP M600 (V1.0) Technical Manual

operation of the equipment. Therefore, the practical power consumption should be

1.5~1.8 times of that under normal temperature.

2.4 Environment Requirements

2.4.1 Grounding Requirements

1. Equipment internal grounding requirements

1) The board should be in reliable contact with the shell of the equipment through

the captive screw on the panel.

2) The protection ground should be isolated from the power ground.

3) If the ZXMP M600 equipment is placed in a cabinet, the mounting lugs of the

shelf should be reliably connected to the cabinet. Besides, to be grounded, the

shelf should be connected with the grounding copper bar of the equipment room

through the cabinet grounding point. If the equipment is installed on a desktop,

it should be grounded through the connection between the wiring terminal of the

shelf and the grounding copper bar of the equipment room.

2. Grounding requirements of DC power

1) The Protection Ground (PGND) should be grounded through the shelf shell.

2) The work ground (-48V GND, +24V GND or -60V GND) should be isolated

from the protection ground.

3) If independent grounding is adopted in the equipment room, the grounding

resistance of the working ground should be 4Ω and that of the protection ground

should also be 4Ω.

4) If joint grounding is adopted in the equipment room, then the grounding

resistance should be 1Ω.

2.4.2 Temperature and Humidity Requirements

The requirements of ZXMP M600 equipment for environment temperature and relative

humidity are shown in Table 2.4-1.

2-4

Chapter 2 Technical Indices

Item Requirements

Environment temperature 0°C~+45°C

Transportation and storage temperature -20°C~ +60°C

Relative humidity 10%~90% (35°C)

2.4.3 Cleanness Requirements

The cleanness requirements involve dust and corrosive gas in the air. The equipment

should work in an equipment room that meets the following cleanness requirements:

1. There should be no explosive, conductive, magnetic-conductive or corrosive

dust in the transmission equipment room.

2. The density of the dusts with a diameter greater than 5µm should be less or

equal to 3×104 particle/m3.

3. There should be no such gas as SO2 or NH3 that will corrode metal or damage

the insulator.

Table 2.4-1 Temperature and Humidity Requirements

4. The equipment should be kept clean. Besides, the door and the windows should

be sealed.

2.4.4 Dustproof and Anti-corrosion Requirements

According to the application range of GB4798 and the ZXMP M600, the dustproof and

anti-corrosion requirements are as follows:

1. Storage environment: 1K5/1Z1/1B2/1C2/1S3/1M3; with the continuous storage

time being 180 days

2. Transportation environment: 2K4P/2B2/2C2/2S3/2M3; the continuous

transportation time being 30 days

3. Operation environment: 3K5/3Z2/3Z7/3B2/3C2/3S2/3M3; the continuous

operation time being 20 years.

2.5 Working Wavelengths

The working wavelengths of the ZXMP M600 equipment are in strict compliance with

ITU-T Recommendation G.694.2. Specific central wavelengths and central frequencies

used in a multi-channel system are adopted.

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ZXMP M600 (V1.0) Technical Manual

1. When ordinary fibers are adopted, the common working wavelengths of the

ZXMP M600 are 8+1 wavelengths, and the wavelength interval is 20nm. “+1”

indicates to add a channel for the 1310nm window. The distribution of the

wavelengths is shown in Table 2.5-1.

Table 2.5-1 Wavelength Distribution of the ZXMP M600 Equipment (with ordinary fibers adopted)

Wavelength No. Central Wavelength/Frequency (nm)

0 1260nm~1360nm O-Band

1 1471

2 1491

3 1511

4 1531

5 1551

6 1571

7 1591

8 1611

Note: 0 standards for the 1310nm wavelength.

2.6 Reliability

MTBF/ch ≥ 50000 hours (The Mean Time Between Failures of a single channel of

equipment at each node will be about 6 years.)

2.7 Optical safety and electrical safety

1. When installing and making input and output connections for the equipment,

the relevant safety standards e.g.IEC60950/VDE0805/EN60950/UL60950 must

be compiled.

2. The equipment is intended to be installed by SERVICE PERSONNEL and has

been provided with protective earthing connection.

3. For short circuit and overcurrent protection, the equipment is protected by DC

supply.

4. Maximum ambient temperature around the equipment should not exceed 55°C.

5. The operating wavelength of the system is 1260nm to 1620nm.

2-6

Chapter 2 Technical Indices

6. All the laser modules in the equipment comply with the requirements of IEC

60825-1:1994+A2:2001 and IEC 60825-2:2000.

7. Reproduction of all warning labels.

2.8 Indices of System Component Parts

2.8.1 Performance Indices of OMD

OMDs used in the ZXMP M600 equipments include OMD5-1, OMD4-1 and OMD4-5.

The figures before “-” respectively indicate the number of the channels on the board,

while the figures after “-” respectively indicate the serial number of the starting

wavelength.

The optical interfaces of each board are shown in Fig. 2.8-1.

UPG: Upgrade interface; Ln: line interface; CH0: 1310 window; /I: input; /O: output

Different OMD units can be combined to implement the multiplexing/demultiplexing

of different wavelengths.

1. OMD5-1: multiplexing/ demultiplexing 4+1 wavelengths. “+1” indicates the

Fig. 2.8-1 Optical Interfaces of OMD Units

1310 channel.

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ZXMP M600 (V1.0) Technical Manual

2. OMD5-1+OMD4-5: multiplexing/ demultiplexing 8+1 wavelengths. “+1”

indicates the 1310 channel.

Take common 4+1 and 8+1 wavelengths for example. The major performance indices

of the ZXMP M600 OMD units are as shown in Table 2.8-1.

Table 2.8-1 Performance Indices of OMD

Parameter Unit 4+1 Wavelengths 8+1 Wavelengths

Bandwidth of CWDM channel @ 0.5dB nm λC ±6.5 λC ±6.5

Insertion loss

(including the

connector)

Isolation

Return loss dB ≥40 ≥40

Line- CWDM dB ≤2.3 (note 1) ≤3.5(note 1)

Line -UPG dB ≤2.3 ——

Line - 1310nm dB ≤1.2 ≤1.2

Wavelengths adjacent to the 8

wavelengths of the CWDM

channel

dB

DEMUX: ≥30

MUX: NA

DEMUX: ≥30

MUX: NA

Note 1: Please note that 2.3dB loss is intended for system requirement. The actual product performance is much better

than the requirement, up to 0.5dB can be reduced in OMD loss when calculating budget. Configuration can use typical

value of 2.0dB (4+1 Wavelengths) and 3.0dB (8+1 Wavelengths).

2.8.2 Performance Indices of OAD Units

The OAD units used in the ZXMP M600 system include OAD1, OAD2 and OAD3.

The figure in each unit indicates the number of add/drop channels.

The optical interfaces of the OAD units are shown in Fig. 2.8-2.

ABLine/I

ABLine/O

Fig. 2.8-2 Optical Interfaces of OAD Units

Add/drop multiplexer

ABChi

i＝1, 2, 3

BALine/O

BALine/I

BAChi

Here, A Line and A_ADi interfaces indicate the line optical interface and channel

optical interface at the A side respectively; B Line and B_ADi respectively indicate the

2-8

Chapter 2 Technical Indices

1 (Downlink and uplink channels of 1310

1 (Downlink and uplink channels of 1310

line optical interface and the channel optical interface at the B side; /I indicates input

while /O indicates output. For example, “A Line/O” indicates the output line optical

interface at the A side.

The major performance indices of the OAD units are shown in Table 2.8-2.

Table 2.8-2 Performance Indices of OAD Units

Parameter Unit CWDM Channel 1310nm Window

Bandwidth of CWDM channel

@ 0.5dB

1310/1550 window range nm ——

In-Out dB ≤1 (OAD1), ≤2 (OAD2), ≤3 (OAD3)

In-Drop dB

Insertion loss

(including the

connector)

Add-Out dB

CWDM Isolation dB

Return loss dB ≥45

nm λC±6.5 ——

1260 ~ 1360 (transmission port)

1461 ~ 1621 (reflection port)

≤

wavelength in OAD1, OAD2, OAD3)

≤1 (one of the 8 CWDM wavelengths of OAD1)

≤2 (one of the 8 CWDM wavelengths of OAD2)

≤3 (one of the 8 CWDM wavelengths of OAD3)

≤

wavelength in OAD1, OAD2, OAD3)

≤1 (one of the 8 CWDM wavelengths of OAD1)

≤2 (one of the 8 CWDM wavelengths of OAD2)

≤3 (one of the 8 CWDM wavelengths of OAD3)

DEMUX: ≥30

MUX: NA

——

2-9

ZXMP M600 (V1.0) Technical Manual

T

2.8.3 OTU Interface Indices

The OTU module used in the ZXMP M600 includes a line optical transmitting module,

line end optical receiving module and client optical transceiving module.

1. Indices of the line end optical transmitting port

The Indices of the line end optical transmitting port are shown in Table 2.8-3.

S point Parameters at the Optical Output End Unit Indices

Optical source type SLM

Optical signal rate (multiple rates) bit/s

Maximum -20dB bandwidth nm 1

Minimum side mode suppression ratio dB 30

Average transmitting optical power (with the

shell temperature between 0°C~70°C)

Minimum extinction ratio dB 8.2

Eye pattern diagram

Wavelength precision (the shell temperature

being 0°C~70°C)

Dispersion tolerance ps/nm 1600

Table 2.8-3 Indices of the Line End Optical Transmitting Port

155M/622M/2.5G

1.25G (GE signals)

dBm 0~5 (note 1)

STM-N signals conform to ITU-

Recommendation G.957

That of the GE signals conforms to

IEEE802.3z.

1471/1491/1511/1531/1551/1571/1591/161

nm

1±6.5

Or 1260~1360 (to 1310nm wavelength)

Note: actually output power is 0~1dBm.

2-10

Chapter 2 Technical Indices

When the SDH signals are being received,

the jitter performance conforms to the

T

2. Indices of the line end optical receiving port

The Indices of the line end optical receiving port are shown in Table 2.8-4.

Table 2.8-4 Indices of the Line End Optical Receiving Port

R Point Parameters at the Optical Input End Unit Indices

Optical signal rate (multiple rates) bit/s 155M/622M/2.5G/1.25G (GE signals)

Optical signal rate (continuous rate) bit/s 10M~2.5G

Receiving sensitivity: 2.5Gbit/s) dBm <-28 (APD)

Receiver reflection dB >27

Overload receiving power dBm >-9 (APD)

Wavelength range of input signals nm 1460~1620

Jitter performance

requirements for regenerator in ITU-

Recommendation G.958.

Note:

1. For receiving sensitivity at 1E-15, use 2 dB as the penalty.

2. If Receiving Power is greater than -9dBm, external attenuator is required to reduce the receiving power to below

-9dBm.

2-11

ZXMP M600 (V1.0) Technical Manual

3. Indices of client optical transceiving module

When STM-1/4/16 signals are transceived at the client, the optical indices

conform to ITU-T Recommendation G.957; when GE signals are transceived,

the optical indices conform to IEEE802.3, as shown in Table 2.8-5.

Table 2.8-5 Indices of Client Optical Transceiving Module

Unit STM-16I-16.1 1000BASE-LX 1000BASE-SX (50µm)

Optical source type MLM SLM MLM

Optical signal rate Mbit/s 2488.32 1250 1250

Maximum bandwidth (RMS) nm 4 4 0.85

Maximum -20dB bandwidth nm —— —— ——

Average transmitting power dB -10~-3 -11.5~-3 -9.5~-4

Minimum extinction ratio 8.2 9 9

Eye pattern diagram G0.957 IEEE802.3z IEEE802.3z

Wavelength range nm 1260~1360 1270~1355 770~860

Receiver type PIN PIN PIN

Minimum sensitivity dBm -18 -19 -17

Minimum overload dBm -3 -3 0

Maximum optical reflection dB -27 —— ——

Minimum optical return loss dB 24 12 12

Line attenuation range dB 0~7 8 7.5

Max transmission distance m 2000 5000 500

Optical Fiber type SMF SMF MMF

2-12

Chapter 2 Technical Indices

2.8.4 Performance Indices of Optical Supervisor Channel

The optical monitoring channel of the ZXMP M600 is implemented on the NCP board.

Its major performance indices are shown in Table 2.8-6.

Table 2.8-6 Major Performance Indices of Optical Monitoring Channel

Central Wavelength (nm) 1310±50 1511±6.5

Signal code pattern 4B5B 4B5B

Monitoring rate 100Mbit/s 100Mbit/s

Optical source type SLM LD SLM LD

Signal transmitting rate (dBm) -5~0 -5~0

Minimum receiving sensitivity (dBm) -34 -34

Minimum overload power (dBm) -10 -10

2.8.5 SRM42 Interface Indices

The OTU module used in the ZXMP M600 includes a line optical transmitting module,

line end optical receiving module and client optical transceiving module.

1. Indices of the line end optical transmitting port

The Indices of the line end optical transmitting port are the same as OTU shown

in Table 2.8-3.

2. Indices of the line end optical receiving port

The Indices of the line end optical receiving port are the same as OTU shown in

Table 2.8-4.

2-13

ZXMP M600 (V1.0) Technical Manual

3. Indices of client optical transceiving module

When STM-1/4 signals are transceived at the client, the optical indices conform

to ITU-T Recommendation G.957; as shown in Table 2.8-7

Table 2.8-7 Indices of Client Optical Transceiving Module

Unit STM-1 S-1.1 STM-4 S-4.1

Optical source type MLM MLM

Optical signal rate Mbit/s 155.520 622.080

Maximum bandwidth (RMS) nm 7.7 4

Maximum -20dB bandwidth nm —— ——

Average transmitting power dB -15~-8 -15~-8

Minimum extinction ratio 8.2 8.2

Eye pattern diagram G.957 G.957

Wavelength range nm 1261-1360

Receiver type PIN PIN

Minimum sensitivity dBm -28 -28

Minimum overload dBm -8 -8

Line attenuation range dB 0-12 0-12

Max transmission distance m 15000 15000

Optical Fiber type SMF SMF

1293-1334/

1274-1356

2-14

3 System Function

This chapter deals with the functions of the ZXMP M600 equipment, including the

transmission function, service access capability, communication monitoring function,

power input/output function, grounding function and protection function.

3.1 Line Transmission Function

1. The ZXMP M600 is suitable for large-capacity optical transmission.

When ordinary fibers are used, the maximum number of working wavelengths

of the system reaches 8+1 (“+1” indicates to add a 1310 channel);

The maximum transmission rate is 2.5Gbit/s. The wavelength selection and

wavelength interval are in strict compliance with ITU-T Recommendation

G.694.2.

3-1

Besides, the system supports multiple networking modes such as chain network,

ring network and tangent ring network.

2. As the node span of a MAN is flexible, the system supports various node spans.

ZXMP M600 (V1.0) Technical Manual

3.2 Service Functions

3.2.1 Service Access Function

The ZXMP M600 can access the following services:

 SDH service, including STM-1/4/16 service

 SONET service, including OC-3/12/48 service

 ATM service or POS service; the latter including VC4, VC4-4c and VC4-16c

 Ethernet service, including GbE

3.2.2 Service Convergence Function

The ZXMP M600 can multiplex (converge) and demultiplex low rate signals.

 Each SRM42 board can multiplex 4 channels of 155Mbit/s and 622Mbit/s SDH

signals or ATM signals.

 Each GEM2 board can multiplex channels of GbE signals.

3-2

Chapter 3 System Function

3.3 Communication and Monitoring Functions

3.3.1 Communication between EMS and Access Point

The communication between an access point and the EMS can be implemented either

through an Ethernet electrical interface or a DB9 socket.

Both interfaces are on the NCP board. The former is marked as ETH1 or ETH2, while

the latter marked as RS232.

1. Direct connection with the EMS through an Ethernet electrical interface

The electrical interface on the NCP board of the ZXMP M600 equipment can

implement the automatic cross-connection function supported by interface

cables. Thus, either cross-connect or straight-through network cable can be

connected to the EMS to implement the communication between the EMS and

the accessed network element.

Network

management system

CWDM n ode 2

CWDM n ode 3

Fig. 3.3-1 Connection between the Access Point and the EMS (through an Ethernet interface)

ET H1 or ET H2 interface

CWDM n ode 1

CWDM n ode 5

CWDM n ode 4

2. Connection with the EMS through bound SDH equipment of ZTE

An optical channel consists of CWDM nodes. Though the CWDM nodes, logic

connection is set up between the SDH nodes. If the CWDM equipment has not

adopted 1310 or 1510 wavelength to transmit the monitoring information, then

the DCC channel of the ZTE SDH equipment can be used for monitoring.

3-3

ZXMP M600 (V1.0) Technical Manual

The connection between the CWDM/ SDH nodes and the EMS is described

below:

1) For the CWDM equipment that does not serve as an element management access

node, its ETH1 or ETH2 interface on the NCP board of can be connected with

the Ethernet interface of the SDH equipment.

2) The Ethernet interface on the NCP board of the CWDM equipment that serves

as an access node for the EMS can be connected to the HUB.

3) The Ethernet interface of the SDH equipment that serves as an access node for

the EMS can be connected with the HUB.

4) The HUB is connected to the EMS.

Take a ring network as an example. The connection is shown in Fig. 3.3-2.

SDH no de 1

CWDM n ode 1

SDH no de 2

CWDM node 2

CWDM n ode 3

SDH no de 3

Network cable Physical optical line

Fig. 3.3-2 Connection with the EMS Through SDH Equipment

The SDH nodes and CWDM nodes share the same EMS, ECC route and DCC

route.

Each SDH node is equivalent to a router that adopts the OSPF protocol while

each CWDM node is equivalent to a L2 switch. The SDH and CWDM nodes

form a local Ethernet at last. The network management information between the

EMS and CWDM node is transmitted through the DCC and ECC channels of

the SDH equipment.

SDH no de 4

CWDM node 4

Logic optical line

Hub

Network

management syst em

3-4

Chapter 3 System Function

In Fig. 3.3-2, the data between CWDM node 3 that serves as a non-access node

and the EMS is taken as an example to describe the data report flow. Here, the

report from CWDM node 3 is transferred to the aggregate overhead of the SDH

equipment through the Ethernet interface of SDH node 3. It is then sent to the

access node SDH node 4 and further to the EMS server through the HUB.



 Tips



This access mode requires the SDH equipment to support and run the OSPF protocol.

3. Communication with the EMS through RS232

The RS232 interface on the NCP board can either serve as an f interface or drive

the Modem.

1) When serving as an f interface, RS232 is used to connect the LMT. The

networking mode is shown in Fig. 1.2-4.

2) When used to drive the Modem, RS232 can be used to manage the equipment

through dialing up, as shown in Fig. 3.3-3.

CWDM

equipment

RS232

TALK / DATA

RS CS TR R D TD CD

TALK

Modem

Fig. 3.3-3 Connection with the EMS through RS232

3.3.2 Communication between Nodes

WDM equipment has no channel for transmitting network management information. It

must access the NM information to the transmitted user subscriber signals through a

specified interface to implement transparent transmission of the information.

On the other hand, the NM information of the ZXMP M600 is transmitted to the

subscriber signals through AOSC and BOSC interfaces on the NCP board. The

Telephone

switching network

Network

management system

TALK / DATA

RS CS TR RDTD CD

TALK

M odem

3-5

ZXMP M600 (V1.0) Technical Manual

monitoring channel is of the 100BASE-FX type and the wavelength can be either

1310nm or 1510nm.

3.3.3 Intra-node Communication and Monitoring

The ZXMP M600 equipment can add/drop and multiplex multiple wavelengths through

the combination of master CWU+ slave CWU or master CWU+slave CWU+ SMU.

In this case, the inter-node communication and monitoring information is implemented

through the NCP board on the master CWU shelf, while the communication and

monitoring information between different shelves in the same node is implemented

through the S interface on the power board of each shelf.

S interface is a 15-pin socket. Each PCW board provides one S interface and each shelf

can be configured with 2 PCWAS boards.

Take the EMS access point in full configuration for example. The connection of the

interfaces between the shelves is as shown in Fig. 3.3-4.

Master CWU

TALK / DATA

RS CS TR RD TD CD

TALK

Qx

Network

management system

CWU

TALK / DATA

RS CS TR RD TD CD

TALK

S int erf ace S interface S int erface

S int erface

TALK / DATA

RS CS TR RD TD CD

TALK

SMU SMU SMU

Fig. 3.3-4 Intra-node Communication and Monitoring Channel

CWU

TALK / DATA

RS CS TR RD TD CD

TALK

S int erf ace S interface

S int erf ace

TALK / DATA

TALK RS CS TR RD TD CD

S int erf ace

RS CS TR RD TD CD

CWU

TALK / DATA

TALK

S int erface

S int erf ace

TALK / DATA

TALK

RS CS TR RD TD CD

S int erface

S int erface

3-6

Chapter 3 System Function

3.4 Power Input and Output Functions

1. Power Input

The ZXMP M600 supports DC input. The voltage of DC power is –48V, +24V

or –60V.

Two DC power boards can be configured to implement 1+1 hot backup.

In addition, the ZXMP M600 supports input over-voltage and over-current

protection as well as the reverse connection protection of DC input.

2. Power output

The ZXMP M600 equipment outputs +5V/-48V DC with a power of 50W

through power board. Here, +5V is power voltage for the CWU board while

-48V is for the SMU board.

The transformed power is transmitted to the boards through power sockets on

the backplane. Power supplies of the boards are independent from one another.

3.5 Grounding Function

1. In the equipment, the DC work ground should be isolated from the protection

ground.

2. The protection ground of the power input should be connected to the shell of the

shelf.

3. The shielding ground of the board should be connected to the shell of the shelf

through the board panel.

4. A grounding hole is set at the back of the shelf. It is marked as and is

connected to the grounding copper bar of the equipment room through wiring

terminals.

3.6 Alarm Output Function

The ZXMP M600 supports alarm output function. It can output critical alarm, major

alarm and ring trip signals to the row-first cabinet in the equipment room.

The alarm output interface of the ZXMP M600 is situated on the NCP board of the

CWU shelf. It is a RJ11 socket and is marked as ALM.

3-7

ZXMP M600 (V1.0) Technical Manual

3.7 Protection Function

The protection function of the ZXMP M600 supports 1+1 channel protection based on

the ring network.

3.7.1 Ring Network Protection

Ring network protection in the ZXMP M600 indicates channel 1+1 protection. It is

implemented by an OTU with the protection function. The working principle of this

protection in a single node is shown in Fig. 3.7-1.

Fig. 3.7-1 1+1 Protection of Optical Channel on a Ring Network

OTUp+ board is an OTU with the protection function. It provides one interface at the

client and two at the line end.

The switch criteria are the LOS signal of receiving module.

The switch operation is achieved by electrical cross switch chip.

3-8

4 System Configurations and Networking
Modes

This chapter deals with the system configurations and networking modes of the ZXMP

M600 and illustrates the application of the ZXMP M600 through a configuration

example.

4.1 System Configuration

4.1.1 Board Slot Resources

The ZXMP M600 equipment includes a CWU shelf and SMU shelf. The board slot

resources of the two shelves are respectively described below. Each node configures 7

subracks of 1U height maximum. The configuration includes at least one CWU for

NCP, for example, 4 CWU and 3 SMU or 1 CWU and 6 SMU.

4.1.1.1 CWU Shelf

The distribution of the slots in the CWU shelf is shown in Fig. 4.1-1. The figures here

indicate the slot numbers.

Fig. 4.1-1 Slot Distribution in the CWU Shelf

The relation between the boards and the slots is shown in Table 4.1-1.

Table 4.1-1 Relation between the Boards and Slots in the CWU Shelf

Slot No. Boards that can be Inserted Remarks

1, 2 PCW Each PCWAS occupies one slot.

3 NCP Only configured in the master CWU shelf of each node and it occupies slot 3.

3, 4, 5, 6 OTU, OMD, OAD Each board can be inserted in any of the slots and it only occupies one slot.

Note: Slot 3 can be used when NCP is not present.

4-1

ZXMP M600 (V1.0) Technical Manual

4.1.1.2 SMU Shelf

The distribution of the slots in the SMU shelf is shown in Fig. 4.1-2. The figures here

indicate the slot numbers.

FAN

PCW ②

SRM42/GEM2 ③

PCW ①

Fig. 4.1-2 Slot Distribution in the SMU Shelf

The relation between the boards and the slots is shown in Table 4.1-2.

Table 4.1-2 Relation between the Boards and Slots in the SMU Shelf

Slot No. Boards that can be Inserted Remarks

1, 2 PCW Each PCWAS occupies one slot.

3 SRM42, GEM2 ——

4.1.2 Metro Optical Terminal Equipment (OTM)

OTM is used as a terminal node of a line to add/drop all services. Its functional

structure is shown in Fig. 1.2-2.

Take the OTM that adds/drops 8 wavelengths at the terminal for example. The board

configuration of the OTM is shown in Fig. 4.1-3, while the fiber connection is shown

in Fig. 4.1-4.

FAN

FAN

Fig. 4.1-3 Board Configuration of OTM Equipment (which adds/drops 8 wavelengths)

PCWAS

PCWAS

PCWAS

PCWAS

2

1

Slave CWU shelf

2

1

Master CWU shelf

4-2

OMD4-5 OTU

OMD5-1

NCP

4 6

3

4 6

3

OTU

OTU

OTU

5

5

Chapter 4 System Configurations and Networking Modes

Master CWU

OTU1

OTU2

CH1

CH2

CH3

CH4

LINE IN

OM D5-1

LINE OUT

NCP

CH0

UPG

OTU3

CH5

CH6

OM D4-5

OTU4

CH7

CH8

Slave CWU

CH1~CH8: opt ical interface of multiplexin g/ demultiplex ing channel on
OMD board, CH1=147 1nm, int erv al=20n m

CH0: 13 10 nm monit or channel int erf ace o n OMD5-1, which is
connect ed to t he OSC int erface of t he NCP board

UPG: upgrade int erface of OMD board

LINE IN/LINE OUT : op tical line input/ output inter face of OMD board

Fig. 4.1-4 Fiber Connection of OTM Equipment (1310nm monitoring channel)

Configuration description

1. In Fig. 4.1-3, PCWAS boards are adopted to provide -48V DC power input for

the system ddl.

2. In this configuration 2-channel bidirectional OTU boards are adopted. Other

types of OTU boards can also be used as required.

3. The monitoring channel is the 1310nm channel. Therefore, the CWU shelf is

4. If the ZXMP M600 needs to implement the multiplexing function, for a certain

configured with an OMD5-1 board to provide an interface for the 1310nm

channel. If the monitoring channel is 1510nm. The CH3 interface of the

OMD5-1 board should be connected with the OSC interface of the NCP board.

wavelength, a multiplexing board (SRM42 or GEM2) can be used without OTU.

In addition, an SMU shelf should be added for installing the multiplexing board.

4-3

ZXMP M600 (V1.0) Technical Manual

4.1.3 Metro OADM Equipment (OADM)

OADM is used as a node in the middle of the line to add/drop some services. Other

services are directly connected. The functional structure of OADM is shown in Fig.

1.2-3.

Take the OADM that adds/drops 3 wavelengths for example. The board configuration

of the OADM node is shown in Fig. 4.1-5, while the fiber connection is shown in Fig.

4.1-6.

PCWAS

FAN

PCWAS

Fig. 4.1-5 Board Configuration of OADM Equipment (which adds/drops 3 wavelengths)

2

1

ABLine BALine

ABch1 ABch3ABch2

ABLine, ABchn: AB line, channel interface

BALine, BAchn: BA line, channel interface

OAD3

NCP

OAD

BAch2

OTU1 OTU2

NCP

4 6

3

OTU

OTU

BAch3 BAch1

5

Fig. 4.1-6 Fiber Connections of OADM (which adds/drops 3 wavelengths)

Configuration description:

1. In Fig. 4.1-5, PCWAS boards are adopted to provide -48V DC power input for

the system.

2. This configuration is suitable for adding/dropping 3 wavelengths. A_AD1 and

B_AD1 are monitoring channels connecting to AOSC and BOSC on the NCP

board respectively. 1310nm or 1510nm can be chosen as their wavelength.

4-4

Chapter 4 System Configurations and Networking Modes

3. If the 1310nm monitoring channel is not used, as shown in Fig. 4.1-6, the 1310

nm channel can be used as a service add/drop channel.

4. To add/drop 1 wavelength, use OAD1; to add/drop 2 wavelengths, use OAD2; to

add/drop 3 wavelengths, use OAD3 as shown in Fig. 4.1-6. To add/drop more

than 3 wavelengths, OAD and OMD boards can be cascaded to implement the

multiplexing/ demultiplexing function.

5. As shown in Fig. 4.1-6, OTU1 is an OTU with the protection function (that is,

OTUp). It implements 1+1 channel protection based on the ring network. Other

types of OTU boards can also be used as required.

6. If the ZXMP M600 needs to implement the multiplexing function, for a certain

wavelength as shown in Fig. 4.1-6, a multiplexing board (SRM42 or GEM2) can

be used to replace the OTU board. In addition, an SMU shelf should be added

for installing the multiplexing board.

4.2 Networking Mode

The ZXMP M600 can be configured as OTM equipment and OADM equipment to

implement multiple networking modes with various functions and to meet different

levels of networking demands. The networking modes will be briefly introduced in the

following.

4.2.1 Point-to-point Networking

The application of point-to-point networking is shown in Fig. 4.2-1.

OTM OTM

Fig. 4.2-1 Application of Point-to-point Networking

4-5

ZXMP M600 (V1.0) Technical Manual

4.2.2 Chain Networking

The application of chain networking is shown in Fig. 4.2-2.

OTM OADM OTM

4.2.3 Ring Networking

The application of ring networking is shown in Fig. 4.2-3.

OADM

Fig. 4.2-2 Application of Chain Networking

OADM

OADM

4.2.4 Ring-to-chain Networking

The application of ring-to-chain networking is shown in Fig. 4.2-4.

OADM

OADM

OADM

Fig. 4.2-4 Application of Ring-to-chain Networking

OADM

Fig. 4.2-3 Application of Ring Networking

OADM

OADM

OADM

OTM

4-6

Chapter 4 System Configurations and Networking Modes

4.3 Configuration Example

In the following, a typical configuration example will be introduced, in which the

OADM is used for networking. The network topology is a two-fiber bidirectional ring

network, as shown in Fig. 4.3-1.

A

15km

B

5km

C

18km

20km

E

2km

D

Fig. 4.3-1 Networking in a Typical Configuration Example

This network forms an 8+1 wavelength 5-node ring. The perimeter of the ring is 60km

and the interval between nodes is shown in Fig. 4.3-1. Multiplexing service distribution

is adopted here.

1. Multiplexing node: A; number of wavelengths: 8+1, where “+1” indicates the

1310nm channel.

2. Access nodes: B, C, D, E; number of wavelengths: 2+1, where “+1” indicates

the 1310nm channel.

3. Monitoring channel: 1310nm

4. Service requirements: The service requirements of the nodes in the ring network

are shown in Fig. 4.3-2.

4-7

ZXMP M600 (V1.0) Technical Manual

8+1 wave
Add/drop

Node: E

1311 window

1471(1)

1491(2)

1511(3)

1531(4)

1551(5)

1571(6)

1591(7)

1611(8)

Legend:

2xGE

4x622 M

2+1 wave
Add/drop

15km 18km 20km5km

BA C D

osc osc osc osc oscosc

Integrated access without OTU

Configure OTU

Configure OTUP (with p rotected OUT; dotted line indicat ing the protection route)

Op tical monitor

One board

Fig. 4.3-2 Service Requirements

2+1 wave
Add/drop

2+1 wave
Add/drop

4.3.1 Configuration Implementation

2km

2+1 wave
Add/drop

2xGE

4x622 M

4.3.1.1 Configuration Description

According to the service requirements in Fig. 4.3-2, the required boards are analyzed as

follows:

1. NCP board

One NCP board should be configured for each node and be installed in the

master CWU shelf.

As the ZXMP M600 is configured as OADM equipment in the global network

and the monitoring channel is 1310nm, NCP board of which the monitoring

channel type is line and the wavelength is 1310nm should be configured in each

node.

2. PCW board

Two same PCW boards will be configured for each shelf according to the type

of DC power supply equipped in the machine room.

4-8

Chapter 4 System Configurations and Networking Modes

3. OMD board

To add/drop 8+1 wavelengths at Node A, OMD5-1 and OMD4-5 boards should

be used together. Two OMD5-1 boards should be configured to implement

transceiving in two optical line directions.

4. OAD board

OAD3 boards should be configured to add/drop 2+1 wavelengths at Nodes B, C,

D and E, to directly connect 2 wavelengths at Nodes B, C and D, and to directly

connect 6 wavelengths at Node E. The wavelengths to be added/dropped on the

OAD3 boards should be determined according to the requirements as shown in

Fig. 4.3-2.

5. OTUq board

OTUq boards should be configured at Nodes B, C and E as each node need to

transfer two channels of services. The two channels of services in Nodes B and

C occupy the same wavelength though they are in different transmission

directions. The two channels of services in Node E occupy different

wavelengths.

Based on the transmission distance, the optical module of the OTUq boards

should be selected to transfer the wavelengths.

6. OTUp+ board

Nodes B and C each use a wavelength to implement 1+1 channel protection.

Therefore, OTUp+ boards should be configured.

Based on the transmission distance, the optical module of the OTUp+ boards

should be selected to transfer the wavelengths.

7. GEM2 and SRM42 boards

Node D uses two channels of wavelengths for two types of multiplexing services:

GEM2 board is used for GbE service while SRM42 board is used for 622Mbit/s

service.

8. Shelves

The number of shelves to be installed in each node should be determined

according to the types and quantity of the services to be implemented.

4-9

ZXMP M600 (V1.0) Technical Manual

channel bidirectional)

4.3.1.2 Equipment Configuration

Based on the service requirements as shown in Fig. 4.3-2, the configurations of the

nodes are shown in Table 4.3-1.

Table 4.3-1 Equipment Configuration

Configuration Type

CWU shelf 3 1 1 1 1

SMU shelf 2 —— —— 2 ——

NCP 1 1 1 1 1

PCWAS 10 2 2 6 2

OMD5-1 2 —— —— —— ——

OMD4-5 1 —— —— —— ——

OAD3 —— 1 1 1 1

OTUq (two-

OTUp+(single-channel

protection)

SRM42 1 —— —— 1 ——

GEM2 1 —— —— 1 ——

4.3.2 Application Features

1. When ordinary fibers are used, the ZXMP M600 can implement 8+1 wavelength

service in a single node. In this case, the 1310nm wavelength can transmit both

monitoring service and general services.

Configuration Quantity

A B C D E

3 1 1 —— 1

2 1 1 —— ——

2. The ZXMP M600 can access multiple services such as STM-N and ATM

services. It can also implement the multiplexing function from low rate to high

rate and improve the bandwidth.

3. When configured with an OTU board with the protection function (that is,

OTUp+), the ZXMP M600 can implement 1+1 channel protection to guarantee

network security.

4. As the ZXMP M600 does not support optical power amplification, its

requirement for optical parts such as laser is lower than that of DWDM

equipment. In addition, it features compact structure and flexible configuration

and is suitable for different spans of LAN and MAN.

4-10

Appendix A Term Description

A.1 G.652 Optical Fiber

G.652 single-mode optical fiber can be applied to 1300nm and 1550

wavelengths. When it is applied to 1300nm wavelength, the dispersion is about

zero. Therefore, it is the optimum single-mode optical fiber.

The nominal value of the mode field diameter of G652 single-mode fiber is

between 9 µm ~10 µm (the mode field diameter is a parameter unique to

single-mode fibers; it describes the distribution of the optical signals in the fiber

core). The cut-off wavelength λC of the fiber conforms to the 1100nm<λC<1280

nm requirement in the 1300nm wavelength window (it describes the optical

wavelengths that can be transmitted in the single-mode optical fibers). Moreover,

the outer diameter of the cladding area of the single-mode diameter is 125 µm

±3 µm, while the attenuation coefficient is less than 1.0dB/km (for 1300 nm

wavelength area) or less than 0.5dB/km (for 1550 nm wavelength area).

At present, G.652 single-mode optical fibers that can be used for the SDH

development include G.652 A, G.652 B and G.652 C&D.

1) G.652 A: It is applicable to a system lower than G.957, G.691 STM-16. It

supports the single-channel SDH transmission system at the 2.5Gbit/s or a lower

rate and has no special requirement for the PMD coefficient of the intra-cable

fiber.

2) G.652 B: It is applicable to a system higher than G.957 and G.691 STM-16 and it

supports 10Gbit/s and, in some cases, 40Gbit/s transmission systems. Generally

it is required that the PMD coefficient of intra-cable fiber should be less than

0.5ps/km1/2.

3) G.652 C&D: It is applicable to a system lower than G.957, G.691 and G.692

STM-16 and can be full-wave optical fiber. For the detailed description of this

type, please refer to “full-wave optical fiber”.

A-1

ZXMP M600 (V1.0) Technical Manual

G.652A and G.652 B single-mode optical fibers, that is, the ordinary fibers

mentioned above have a large dispersion at 1530nm~1565nm of Band C and

1565nm~1625nm of Band L, which is generally 17ps/nm·km~22ps/nm·km.

When the system rate is 2.5Gbit/s or higher, dispersion compensation is required.

G.652A and G.652 B fibers are widely applied in transmission networks at

present.

A.2 Full-wave Fiber

Full-wave fiber is numbered as G.652 C&D in ITU-T Recommendations. It is

one kind of G.652 fiber. Its full name is wavelength-expanded non-dispersion

single-mode shifted fiber.

The full-wave optical fiber eliminates OH- ions near the 1385nm wavelength and

thus also eliminates the appended peak attenuation caused by the OH- ions. Thus,

the fiber attenuation is only determined by the internal scattering loss of the

silicon glass.

The attenuation of the full-wave fiber becomes even at the band of

1310nm~1600nm. As internal OH- ions are already eliminated, no peak

attenuation will occur even when the fiber is exposed to hydrogen gas and the

long-term attenuation is reliable. Except that there is no peak attenuation,

full-wave fiber is the same as the ordinary standard G.652 clad optical fibers.

Full-wave optical fiber can provide a complete transmission band from 1280nm

to 1625nm. The available wavelength range is about 1.5 times of the wavelength

range of ordinary fibers.

A-2

................... Appendix A Term Description

A.3 Working Wavelength

The working principle of WDM is to multiplex multiple optical channel signals

into one fiber for transmission and implement the reverse process. Therefore, to

allocate channels efficiently in a limited wavelength area, improve the

bandwidth utility and reduce the non-linear effects between adjacent channels,

the working wavelengths of the multiplex optical channel signals should be

specified strictly.

1. DWDM system

As EDFA is used to amplify optical signals, the working wavelength range is

restricted by the amplification range of EDFA, which is 1530nm~1565nm.

However. According to ITU-T Recommendation G.692, the working wavelength

range of the DWDM system is 1528.77nm~1560.61nm and the corresponding

working frequency range is 196.1THz~192.1THz.

2. CWDM system

In the CWDM system, EDFA technique is not used as the transmission distance

is relatively short. The working wavelength range of the CWDM system is

determined by the fibers used. If ordinary fibers, that is, G.652 A&B fibers are

adopted, the working wavelength range is 1471nm~1611nm. If G.652 C&D

full-wave optical fibers are adopted, the working wavelength range is

1271nm~1611nm.

A-3

ZXMP M600 (V1.0) Technical Manual

A.4 Channel Interval

It refers to the nominal frequency difference (wavelength interval) between two

adjacent multiplex channels.

Channel intervals can be either even or uneven. Uneven channel intervals can be

used to suppress the Four Wave Mixing (FWM) effect of G.653 fiber. At present,

however, even channel intervals are used in most cases.

ITU-T Recommendation G.692 specifies that the channel interval of DWDM

system should be an integer multiple of 100GHz (about 0.8nm). At present,

generally two channel interval standards are used, that is, 200GHz (about 1.6nm)

and 100GHz (0.8nm).

IUT-T Recommendation G.694.2 specifies that the channel interval of the

CWDM system should be 20nm.

A.5 Central Wavelength or Central Frequency

It indicates the central wavelength or frequency to which each multiplex channel

in the WDM system corresponds.

The frequency criterion is used in the DWDM system. The working frequency

range of the system is 196.1THz~192.1THz. When the channel interval is

0.1THz, the corresponding central frequencies are 196.1THz, 196.2THz and so

on. When the channel interval is 0.2THz, the corresponding central frequencies

are 196.1THz, 196.3THz and so on.

Wavelength criterion is used for the CWDM system. If G.652 A or G.652 B

fibers are used, the central wavelengths are respectively 1471nm, 1491nm,

1511nm, 1531nm, 1551nm, 1571nm, 1591nm and 1611nm. If full-wave fibers

are used, the wavelength range is 1271nm~1611nm and the interval is 20nm,

then the central wavelengths are respectively 1271nm, 1291nm and so on.

A-4

................... Appendix A Term Description

A.6 Channel Bandwidth

It is a parameter of a demultiplexer. A demultiplexer includes two kinds of

bandwidth: channel bandwidth @-0.5dB and channel bandwidth @-20dB. They

respectively indicate the change value of the corresponding working wavelength

when the insertion loss of the demultiplexer decreases for 0.5dB and 20dB.

1. Bandwidth @-0.5dB: It describes the band pass performance of the

demultiplexer. A good band pass performance curve should be even and broad.

The greater the bandwidth is, the better the performance.

2. Bandwidth @-20dB: It describes the stopband performance of the demultiplexer.

The stopband performance curve should be steep. The greater the bandwidth is,

the better the performance.

The central wavelengths of CWDM filter in the case of channel bandwidth

@-0.5dB end in “1”. The channel interval is 20nm and the precision is ±6.5nm.

When ordinary optical fibers are used, the bandwidth of the wavelengths are

respectively 1471±6.5nm, 1491±6.5nm, 1511nm±6.5nm, 1531nm±6.5nm,

1551nm±6.5nm, 1571nm±6.5nm, 1591nm±6.5nm and 1611nm±6.5nm.

A.7 Insertion Loss

Insertion loss indicates the attenuation of the optical signals caused by the WDM

equipment. It directly affects the transmission distance of the WDM system.

It is the ratio between the optical power of the input port and that of the output

port in the equipment. The formula for calculating it is as below:

IL=-10

In the formula, Pi indicates the optical power transmitted to the input pot, while

Po indicates the optical power received from the output port.

log

(Pi/Po)

A-5

ZXMP M600 (V1.0) Technical Manual

A.8 Isolation

It is a parameter of the demultiplexer and indicates the separation of the

multiplex optical channel signals from the demultiplexer.

The higher the channel isolation is, the better the frequency selection

performance of the WDM equipment. Consequently, the crosstalk suppression

ratio becomes higher and the mutual interference between multiplex optical

channels becomes lower.

Channel isolation includes adjacent channel isolation and non-adjacent channel

isolation.

1. Adjacent channel isolation

It is the ratio between the output optical power of an optical channel and the leak

optical power on this channel from an adjacent optical channel signals that has

the same output power.

It indicates the isolation of the demultiplexer from the two adjacent multiplex

optical channel signals.

2. Non-adjacent channel isolation

It is the ratio between the output optical power of an optical channel and the leak

optical power on this channel from a non-adjacent optical channel.

It indicates the isolation of the demultiplexer from the non-adjacent multiplex

optical channel signals.

A-6

................... Appendix A Term Description

A.9 Reflection

1. Concept

When light is transmitted over an interface made of different media, it will be

reflected and refracted. If the interface is made of uneven media, the reflection

(dispersion) will be very complicated and may exist on different levels. In the

optical channel, it is in the form of reversely transmitted wave, that is, reflection,

which is shown in Fig. A.9-1.

Forward wave

n1

n2

Refracted wave

Reflected wave

Fig. A.9-1 Optical Transmission Over Interface Made of Uneven Media

As the optical fiber is not made of ideal even medium, the practical transmission

over the fiber is as shown in Fig. A.9-2.

Forward wave Reflected wave

Fig. A.9-2 Optical Dispersion Over a Fiber

2. Causes

The reflection may be attributed to the following causes: Rayleigh reflection

caused by Rayleigh dispersion, Stokes reflection caused by Brillouin dispersion,

optical coupling generated at the connection points of optical parts or optical

fibers and reflection caused by multiple interfaces due to optical fiber crackle.

A-7

ZXMP M600 (V1.0) Technical Manual

3. Influence on the system

A.10 Return Loss

The Rayleigh reflection exerts least influence, while Stokes reflection only

occurs at the excitation threshold.

Large reflection may seriously affect the transmission system and produce bit

error, delay and pulse expansion in the signals. If the reflection produces noise,

it will lower the signal-noise ratio and affect the normal operation of the system.

It describes the reflection restriction index of the interface that is used to restrict

the reflection strength in the optical interface on an optical channel.

Optical Return Loss (ORL) is defined as the ratio between the power of the

forward optical signals and the power of the reverse optical reflection at a

specific point.

It can be calculated through the following formula:

IL=10 lg (Ps/PR) (dB)

In the formula, Ps indicates the power of forward optical signals while P

indicates the power of the reverse optical reflection.

A.11 Side Mode Suppression Ratio

It is the ratio between the major mode optical power of the optical source in full

modulation (the peak value) and the maximum side mode optical power

(secondary peak value) under the worst reflection condition. It is only valid to a

laser that supports direct modulation.

A.12 Minimum Extinction Ratio

It indicates the ratio between the average high (on) optical power and the

average low (off) optical power in full modulation under the worst reflection

condition.

R

A-8

................... Appendix A Term Description

A.13 Maximum -20dB Bandwidth

Maximum -20dB bandwidth is a parameter of a Single Longitudinal Mode

(SLM) laser, the unit being nm. It indicates the optical bandwidth when the peak

wavelength decreases for 20dB

A.14 Dispersion Tolerance

Dispersion is a transmission property of optical fibers. As optical pulses with

different wavelengths are transmitted at different rates over an optical fiber, the

dispersion shows the expansion of the optical pulse when transmitted over

optical fibers.

Pulse expansion will cause overlapping of the pulse codes transmitted through

digital communication over optical fibers, that is, inter-code interference will

occur. This will result in bit errors. To avoid bit errors, the pulse interval must be

extended, which will lower the transmission rate and consequently reduce the

communication capacity. On the other hand, the pulse expansion will become

increasingly serious with the increase of the transmission distance.

As the optical parts of the WDM system will be greatly affected by the

dispersion, there is a maximum dispersion value that the WDM system can

tolerate. This is called dispersion tolerance. The system can implement normal

transmission only when the dispersion tolerance is not exceeded.

A-9

Appendix B Abbreviations

AFR Absolute Frequency Reference

AGENT

AIS Alarm Indication Signal

ASE Amplified Spontaneous Emission

BER Bit Error Ratio

CDR Clock and Data Recovery

CMI Code Mark Inversion

CPU Center Process Unit

CRC Cyclic Redundancy Check

CWDM Coarse Wavelength Division Multiplexing

CWU CWDM Unit

DBMS Database Management System

DCC Data Communications Channel

DCN Data Communications Network

DDI Double Defect Indication

DWDM Dense Wavelength Division Multiplexing

DXC Digital Cross-connect

EAM Electrical Absorption Modulation

ECC Embedded Control Channel

EDFA Erbium Doped Fiber Amplifier

ESCON Enterprise System Connection

EX Extinction Ratio

FC Fiber Channel

FDI Forward Defection Indication

FEC Forward Error Correction

FPDC Fiber Passive Dispersion Compensator

FWM Four Wave Mixing

GbE Gigabits Ethernet

GUI Graphical User Interfaces

IP Internet Protocol

LD Laser Diode

LOF Loss of Frame

LOS Loss of Signal

MCU Management and Control Unit

MQW Multiple Quantum Well

B-1

ZXMP M600 (V1.0) Technical Manual

MSP Multiplex Section Protection

MST Multiplex Section Termination

MSTP Multi-Service Transport Platform

MTBF Mean Time Between Failure

NCP Net Control Processor

NE Network Element

NNI Network Node Interface

NMCC Network Manage Control Center

NRZ Non Return to Zero

NT Network Termination

OAD Optical Add/Drop Unit

OADM Optical Add/Drop Multiplexer

OCh Optical Channel

OLT Optical Line Termination

OMD Optical Dmux/Mux Unit

OSC Optical Supervisory Channel

OSNR Optical Signal-Noise Ratio

OSPF Open Shortest Path First

OTM Optical Terminal

OTN Optical Transport Network

OTU Optical Transponder Unit

PCW Power for CWDM Unit

POS Packet Over SDH

PSTN Public Switched Telephone Network

SAN Storage Area Network

SDH Synchronous Digital Hierarchy

SEF Severely Errored Frame

SES Severely Errored Block Second

SFF Small Form Factor Transceiver

SFP Small Form Factor Pluggable

SMCC Sub-network Management Control Center

SMU Subrate Multiplexer Unit

SNMP Simple Network Management Protocol

SRM Sub-Rate Multiplexing

STM Synchronous Transfer Mode

STP Spanning Tree Protocol

TCP Transmission Control Protocol

TMN Telecommunications Management Network

WDM Wavelength Division Multiplexing

B-2