OptiX Metro 500 System Description

8/11/2019 OptiX Metro 500 System Description

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HUAWEI

OptiX Metro 500 Ultra

Compact STM-1 Multi-Service Transmission Platform

System Description

V100R001


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OptiX Metro 500 Ultra Compact STM-1 Multi-Service TransmissionPlatform

System Description

Manual Version T2-040000-20021031-C-1.10

Product Version V100R001

Huawei Technologies Co., Ltd. provides customers with comprehensive technical support

and service. Please feel free to contact our local office, customer care center or company

headquarters.

Huawei Technologies Co., Ltd.

Address: Huawei Customer Service Building, Kefa Road,

Science-based Industrial Park, Shenzhen, P. R. China

Postal Code: 518057

Website: http://www.huawei.com

Phone: +86-755-26540036

Fax: +86-755-26540035

Email: [email protected]


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2002 Huawei Technologies Co., Ltd.

All Rights Reserved

No part of this document may be reproduced or transmitted in any form or by any

means without prior written consent of Huawei Technologies Co., Ltd.

Trademarks

, HUAWEI, C&C08, EAST8000, HONET, ViewPoint, INtess, ETS, DMC, SBS,

TELLIN, InfoLink, Netkey, Quidway, SYNLOCK, Radium, , M900/M1800,

TELESIGHT, Quidview, NETENGINE, Musa, OptiX, Airbridge, Tellwin, Inmedia,

VRP, DOPRA, iTELLIN, C&C08 iNET, iBill and infox are trademarks of Huawei

Technologies Co., Ltd.

Notice

The information in this document is subject to change without notice. Every effort

has been made in the preparation of this document to ensure accuracy of the

contents, but all statements, information, and recommendations in this document

don't constitute the warranty of any kind, express or implied.


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About This ManualOptiX Metro 500 Compact STM-1

Multi-Service Transmission PlatformSystem Description

Networking Application

From the angel of network plan, this part in detail deals with the networking applicationof the OptiX Metro 500.

System Architecture

It introduces the composition of the functional modules of the OptiX Metro 500.Meanwhile, this part deals with the hardware and software structure of this product.

Reliability Design

It introduces the equipment-level protection mode and network-level serviceprotection mode of the OptiX Metro 500.

Operation, Administration and Maintenance

This part is about the major technical features of the OptiX Metro 500 s in suchaspects as running, maintenance, and centralized management.

Technical Specifications

This chapter summarizes various technical parameters and specifications of theOptiX Metro 500.

Appendix Abbreviations

The appendix lists all abbreviations used in the system description together with theirfull names to facilitate the comprehension.


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OptiX Metro 500 Compact STM-1Multi-Service Transmission Platform

System Description

i

Contents

1 Brief Introduction

1 Overview 1

2 Application 3

2 Characteristics of OptiX Metro 500

1 Characteristics 5

2 Functions 7

3 Networking Application

4 System Architecture

1 Functional Modules 11

1.1 Line Unit 12

1.2 Tributary Unit 12

1.3 Cross-Connect Unit 13

1.4 SCC Unit 13

1.5 Clock Unit 13

1.6 Orderwire Unit 13

2 Hardware Structure 14

2.1 Equipment Box 15

2.2 Board 16

3 Software Structure 17

3.1 Host Software 17

3.2 NM System 18


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System Description

iii

Contents

2.4 Jitter Performance Specifications 39

2.5 Electromagnetic Compatibility (EMC) Test

Specifications 41

A Terms and Abbreviations


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System Description

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3 Introduction

1 Overview

The OptiX Metro 500 is designed to improve the bandwidth utilization and

management efficiency of the optical transmission network. It can transport andmanage the STM-1 and E1 services. The OptiX Metro 500 features high integration,easy installation and multiple power supply access modes. These features make itvery suitable to transport terminal accessed services, thus reducing telecomoperation cost.The appearance of the OptiX Metro 500 is shown in Figure 1.

1


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Introduction


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Figure 1Appearance of the OptiX Metro 500

As one of the OptiX Metro series products of Huawei, the OptiX Metro 500 is mainlyused for the service access and transmission at the access layer of the digitalcommunication network. Also, it can be used to construct a communication networkvia the E1 interface together with access network equipment, GSM base station,

CDMA base station ,ETS base station, switch, router, etc.The OptiX iManager T2000 network management system for transmission network(abbreviated as OptiX iManager T2000 hereinafter) can be used to manage the OptiXMetro 500. On the NMS terminal, you can configure, maintain, and monitor the OptiXMetro 500 and the network constructed by it. At any of the NEs or at the remote NMScenter of this transmission network, the authorized user can maintain the entirenetwork via the OptiX iManager T2000.


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Introduction

OptiX Metro 50UltralCompact STM-1Multi-Service Transmission Platform

System Description

3

2 Application

The OptiX Metro 500, together with other SDH transmission equipment, such as theOptiX 155/622H(Metro1000), OptiX 155/622, OptiX Metro 1100, OptiX 2500+(Metro3000), andOptiX 10G, can be used to construct the transmission network. The OptiX series ofoptical transmission products of Huawei are shown in Table 1.

Table 1 OptiX series transmission products

Product type Product name

OptiX Metro 500 Compact STM-1 Multi-Service Transmission Platform.

OptiX 155S STM-1 optical transmission system

OptiX 155/622H(Metro1000) Integrated STM-1/STM-4 MSTP compatible opticaltransmission system

OptiX 155/622 STM-1/STM-4 compatible optical transmission system

OptiX 2500+(Metro3000) STM-16 MADM optical transmission system

OptiX Metro 1100 Integrated STM-16 multi-service transmission system

OptiX 10G STM-64 MADM optical transmission system

OptiX Metro 6100 DWDM multi-service transmission system

OptiX BWS 320G 16/32-path DWDM optical transmission system

OptiX BWS1600G Backbone DWDM optical transmission system

OptiX iManager T2000 Subnet-level integrated network management system fortransmission network

The OptiX Metro 500 is a piece of compact end network transmission equipment. Itcan be used to construct basic networks, such as point-to-point, chain network, ringnetwork, etc. The application of the OptiX Metro 500 in the whole transmissionnetwork is illustrated in Figure 2.


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Introduction


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OptiX BWS 320G

OptiX BWS 320G

OptiX BWS 320G OptiX BWS 320G

OptiX BWS 320G

32 32

32

32

32

Backbonenetwork

OptiX 10G

OptiX 10G

OptiX 2500+

OptiX 155/622

OptiX 155/622H

OptiX 155/622

OptiX 155/622H

Local area network

End access network

OptiX 2500+

OptiX 2500+

OptiX 2500+

OptiX 2500+

OptiX 10GOptiX 10G

OptiX 10G

OptiX 10G

Regional network

OptiX 10G

OptiX 2500+

OptiX 2500+

OptiX 2500+

OptiX Metro 500

OptiX Metro 500

Figure 2 Position of the OptiX Metro 500 in the entire network solution


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System Description

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4 Features and Functions

1 Features

The OptiX Metro 500 is a STM-1 optical transmission equipment designed by Huawei

accrording to the demand of the low-end transmission market. It adopts 19-inchstandard structure and has the following features.

Small dimensions, low cost, and easy installation and maintenance. Thefollowing installation methods are supported:Installation in the OptiX C seriescompact cabinets, installation in 19-inch standard cabinet, installation in the300mm-deep ETSI cabinet, installation in the 600mm-deep ETSI cabinet,wall-mounting installation, and installation on desktop .

Provides five power supplies, i.e. 220V AC, 110V AC, -48V DC, -60V and +24VDC. 220V AC power board is compatible with 110V AC. -48V DC power boardis compatible with -60V DC.

Has the capability of processing two ECCs.

Provides one clock inpout /output of 120(not available in the first versionV100R001, but in the second version V100R002).

Provides three Boolean input and one output (not available in the first versionV100R001, but in the second version V100R002).

Supports multiple optical transmission distances, such as 30km/50km/90km.

Enjoys good compatibility, which is beneficial to extending the function later.

2


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Features and Functions


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The second version V100R002 of the OptiX Metro 500 will support the transparent

transmission of Ethernet service.

Outstanding interface jitter performance

The E1 interface mapping jitter, combination jitter of the OptiX Metro 500 are superiorto ITU-T recommendations, which enables the system to reliably transmit services,such as GSM, NO.7 signaling, data communication, etc.

Outstanding clock synchronization performance

The timing system can work in the modes such as locked, holdover, or free-run mode.When the timing system works in the locked mode, you can select a line clock ortributary clock as the clock reference. By setting the priorities of the clock sources, thereliability of the system can be guaranteed.


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Features and Functions


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2 Functions

1. Service cross-connect capability

The OptiX Metro 500 can support 66VC-4 full cross-connect.

2. SDH/PDH service proceesing capability

The OptiX Metro 500 provides one or two STM-1 optical interfaces to receive one ortwo STM-1 optical signals. Meanwhile, it provides 8/16/24/32 E1 electrical interfaces.

3. Flexible networking capability

The OptiX Metro 500 supports multiple network topologies, including point-to-point,line and ring.

4. Protection mechanism

The OptiX Metro 500 supports unidirectional/bidirectional path protection ring.

5. Network Management System (NMS)

The OptiX iManager T2000 performs unified Operation, Administration andManagement (OAM) on the OptiX Metro 500, and achieves the configuration andgrooming of circuits for a secure network operation.

6. Power monitoring function

When the -48V DC power supply is adopted, the OptiX Metro 500 provides two -48Vinput ports working in mutual backup. Besides, it can monitor abnormal status of thevoltage, such as undervoltage and overvoltage, and can generate correspondingalarms.

When the +24V DC power supply is provided, the OptiX Metro 500 can provide two+24V input ports working in mutual backup. Besides, it can monitor abnormal status

of the voltage such as undervoltage and overvoltage, and can generatecorresponding alarms.


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System Description

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5 Networking Application

The OptiX Metro 500 can be deployed in two types of network topologies as followed.

Chain network

Figure 3shows an ordinary chain network. When it is adopted, the service is generallytransmitted bidirectionally.

This networking mode needs few optical fibers, so it is very applicable to the networkalong the railway not ring network.

STM-1 opticalsignal

STM-1 opticalsignal

E1 electricalsignal

TM TMADM

E1 electricalsignal

E1 electricalsignal

Figure 3 Chain network

Ring network

Figure 4 shows a basic ring network. The OptiX Metro 500 itself can construct the ringnetwork with the rate of STM-1. Besides, it can realize the following ring networkself-healing protection modes (recommended in ITU-T): two-fiber unidirectional pathprotection ring, and two-fiber bidirectional path protection ring.

3


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System Description

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6 System Architecture

1 Functional Modules

The OptiX Metro 500 is designed in compliance with ITU-T recommendations. Figure5 shows the functional structure of the system.

STM-1 optical signalE1 electrical signal

VC-4

6 6

VC-4 VC-4

Cross-connect

matrix

TULU

Orderwire

unit

Clock

unit

SCC

unit

Figure 5 Functional modu les of the OptiX Metro 500

4


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System Architecture


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1.1 Line Unit

The line unit of the OptiX Metro 500 offers one or two STM-1 optical interfaces toreceive and transmit the STM-1 optical signals. These interfaces mainly performoptical/electrical conversion of the STM-1 signal, extraction/insertion of the overheadbytes and generation of alarm signals on the line. It supports inloop and outloop testsof the line so that you can locate the fault as soon as possible.The line unit of theOptiX Metro 500 has the following features:

Optical interface characteristics: can configure three optical modules, i.e. S-1.1,L-1.1, and L-1.2 and provides multiple optical transmission distances, e.g.30km/50km/90km.

Has the Automatic Laser Shutdown (ALS) function.

Capable to detect and report various alarm signals and performance events onthe lines.

Has inloop and outloop functions.

With the cooperation of the cross-connect unit, it can construct ring and chainnetworks.

1.2 Tributary Unit

The tributary unit of the OptiX Metro 500 maps accessed E1 signals (75/120) into

VC-4 (then to the cross-connect unit). Conversely, it demaps VC-4 from the cross-connect unit into E1 signals. At the same time, it reports performance and alarm dataof each path to the SCC unit. The tributary unit of the OptiX Metro 500 has thefollowing features: The tributary unit of the OptiX Metro 500 maps accessed E1

signals (75/120) into VC-4, and then to the cross-connect unit. Conversely, itdemaps VC-4 from the cross-connect unit into E1 signals. At the same time, it reportsperformance and alarm data of each path to the SCC unit.The tributary unit of theOptiX Metro 500 has the following features:

Provides unbalanced impedance interface of 75and balanced impedance

interface of 120. 2mmHM connectors are used for both 75and 120interfaces to connect coaxial cables and twisted-pair cables respectively.Interfaces meet the specifications stipulated in ITU-T Recommendation G.703.

Processes VC-12 path overhead, performs configuration, alarm andperformance monitoring for each service path and establishes thecommunication between each service path and the SCC unit.

The process of asynchronously mapping and multiplexing E1 signals into VC-4, complies with ITU-T Recommendation G.707.

Has the function of inloop and outloop tests, which helps effective fault location.


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Has the APS function. By setting the path protection switching function via the

NM system, whether the path protection is to be triggered is determined by thedeterioration of corresponding path signals on active/standby rings with thedual-fed, signal selection function.

1.3 Cross-Connect Unit

The cross-connect unit is the core of the service grooming and serves as the cross-connect of line and tributary signals in the OptiX Metro 500 equipment. It can flexiblyrealize the free grooming of E1 services and support path protection. Also, it supportsmultiple configuration of the equipment and various networking modes, such aspoint-to-point, chain and ring.

1.4 SCC Unit

The SCC unit, as an important module, fulfills Synchronous Equipment ManagementFunction (SEMF) and Message Communication Function (MCF). The SCC unit hasthe Ethernet network management interface, through which, the control and settingdata of all the units can be received on a PC or workstation. Meanwhile, The SCC unitprovides the DCC communication function to communicate with the remote NE.Inaddition, the SCC unit communicates with the line and tributary units, and monitoralarms on them. Also, it collects the performance data and delivers them to the NMSregularly.

1.5 Clock Unit

The clock unit mainly fulfils synchronization. It provides the synchronous clock for lineand tributary units of the system, and also locks the line and tributary clock sources toachieve system synchronization.At the same time, it offers one clock output of 120(not available until the second version V100R002).

1.6 Orderwire Unit

This orderwire unit mainly realizes part of OHA function and DCC processing functionof the MCF.

It provides one transparent data interface, three Boolean inputs and one Boolean

output. The interface is of RJ-45.Here, the function of three Boolean inputs and oneBoolean output will not be offered until the second version V100R002.


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System Architecture


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2 Hardware Structure

The OptiX Metro 500 adopts a box-shaped structure. The dimensions are: 436mm

(width) 293mm (depth) 42mm (height). Figure 6 and Figure 7 show its

appearance and backplane.

Figure 6Appearance of the OptiX Metro 500

Figure 7 Backpanel of the OptiX Metro 500

The compact structure of the OptiX Metro 500 enables its flexible installation.According to the actual equipment room environment, you can select to install it in the


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System Architecture


System Description

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OptiX C series integrated cabinet, 300mm-deep ETSI cabinet, 600mm-deep ETSI

cabinet, or 19-inch standard cabinet. Also, you can adopt wall-mounting installation ordesktop installation.


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2.1 Equipment Box

Figure 8 shows the back of the OptiX Metro 500. For detailed description, see Table 2.

Figure 8 Wiring area of the back of the OptiX Metro 500

Table 2 Description of the interfaces of the OptiX Metro 500

Tag Silkscreen Description Remarks

1 Grounding terminal OptiX Metro 500 connects withPGND in equipment room bythis grounding terminal.

2 PW48 Power supply of -48V There are five kinds of power

supply: 220V AC, 110V AC,-48V DC,-60V,+24V DC.

220V AC power board iscompatible with 110V AC. -48VDC power board is compatiblewith -60V DC

3 ON/OFF Power switch

RUN Running indicator Dark : OptiX Metro 500 is notpowered

Flash per 0.5 second : waitingfor loading software

Quick Flash : loading software

Slow flash : running normaly4

CRT Serverly alarmindicator

Dark :no critical alarm

Light :critical alarm


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Tag Silkscreen Description Remarks

MAJ Major alarm indicator Dark : no major alarm

Light : major alarm

LOS Left Optical interfaceindicator

5

LOSRight Optical interfaceindicator

6 Optical Interface There are three types of opticalmodule :S-1.1/L-1.1/L-1.2

Transmissiondistance :30km/50km/90km

7 RST Reset Key Reset OptiX Metro 500

8 ETHERNET Network managementinterface

To connect the NM.

9 F2 Transparent datainterface

It is used to transmit supervsiondata and its electrical attributeis RS-232.

10 ALARM Alarm Boolean It is used to transmit alarm data.

11 CLK interface of the

120

clock

Input or output of 120clock.

(not available in V100R001,butsupported by the software ofthe second version V100R002

12 16 13 12 9 8 5 4 1 2mmHM connector To receive and transmit E1electrical signals

13 EXT Extended slot To which the SP2 board or theEthernet interface board can beadded to; can be used toadd/drop E1 signals.

14

ESD

Antistatic interface To which the antistatic wriststrap is inserted.

15 Fan

2.2 Board

The OptiX Metro 500 (first version) provides the ISU board, and its extended slot


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supports the SP2D board.

ISU provides one or two STM-1 optical interfaces, and eight or sixteen E1 electricalinterfaces.

The SP2D offers sixteen E1 electrical interfaces.

In the following versions, the extended slot will support such boards as the Ethernetboard, etc.


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3 Software Structure

The OptiX Metro 500 system adopts modular design for the software system.Basically, software system can be divided into NE software and NMS, which lie in the

ISU control unit and the NMS computer respectively to realize specific functions.

shows the software structure of the OptiX Metro 500 system.In this

figure, all the modules belong to the NE software except Network managementsystem. The following details the functions of these two modules and how thefunctions are implemented.

Network management system

Equipment management

module

Communication module

Real-

timemulti-taskoperatingsystem

Databasemanagementmodule

Figure 9 General structure of the OptiX Metro 500 system software

3.1 NE Software

Realtime multi-task operating system

The realtime multi-task operating system of the OptiX Metro 500 system NE softwareis responsible for managing public resources and supporting application programs. Itisolates the application programs from the processor and provides an applicationprogram execution environment, which is independent of the processor hardware.

Equipment management module

Equipment management module is the kernel of the NE software for implementingnetwork element management, and it includes Manager and Agent. Manager cansend network management operation commands and receive events. Agent canrespond the network management operation commands sent by Manager, operatethe managed object, and send events according to the change in the state of themanaged object.

Communication module


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The communication module exchanges management information between the NM

system and NE and among NEs. It consists of network communication module, serialcommunication module and ECC communication module.

Database management module

The database management module is an organic part of the NE software. It includestwo independent parts: data and program. The data are organized in the form of adatabase, consisting of network database, alarm database, performance databaseand equipment database. The program accesses and manages data in the database.

3.2 NM System

The OptiX iManager T2000 NMS exercises unified management on the opticaltransmission system and provides maintenance for all SDH, DWDM NEs on theentire network. In compliance with ITU-T Recommendations, it is a networkmanagement system integrating standard management information model andobject-oriented management technology. It exchanges information with the NEsoftware via the communication module to monitor and manage the equipment overthe network.


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7 Reliability Design

The OptiX Metro 500, with multiple up-to-date protection technique employed indesigning its hardware and software, provides various protection mechanisms for thenetwork, thus guaranteeing a high-quality transmission service.

1 Redundancy and Protection

1.1 1+1 Redundancy Hot Backup Protection for

Power Supply

The power supply systems of -48V and +24V are offered by two DC operatingpower supplies connected from the outside, which can provide backupprotection for each other. Thus, the equipment keeps running normally in caseeither of them is faulty.

Double backup for the 220V inner power module

1.2 Protection in Abnormal Conditions

Maintenance alarm for abnormal system

An alarm will be generated to notify the network monitoring terminal once anyabnormality is detected in the system by the hardware or software.

Power supply protection

5


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Meanwhile, board hardware is designed in such a way that CPU will be reset in case

of undervoltage and the software will reinitialize the chip.

Protection on board power failure and software reset

The application program and its data file are stored both in SDRAM and in FLASH.Meanwhile, FLASH provides the backup protection for the data saved in SDRAM.Incase of board power failure or software reset, the software can automatically recoverthe correct program and data from FLASH before the power failure or software reset.

Power failure protection and break-point resending protection

The BIOS of the board is write-protected. The program and data files of applicationsoftware, which can be loaded on-line, are configured with check function to avoidincorrect data transmission. After the software loading is interrupted, the BIOS waits

for continuous loading at the breakpoint instead of restarting to load the wholeprogram or data files.

Software upgrading protection

Two copies of NE software are stored in the SCC unit so that a new version of thesoftware can be loaded without affecting the current software running. The oldsoftware will be replaced by the new version once new one is confirmed as correct.This replacement does not affect the configuration information already set or NEequipment service. And the software of the old version will continue to work if softwareupgrading fails.

1.3 Software Fault-Tolerance

The CMM specifications are initiated for controlling the development process,with the idea of software engineering highlighted. Extensive software qualityassurance activities are carried out, and the top-down program design andobject-oriented design are followed. With up-to-date software development,management and design technique, the quality and reliability of software areguaranteed.

The software features IC and simple modular interface, and realizes highcohesion and low coupling.

It has powerful CPU load equalization and overload processing capability byadopting information driving and grooming.

It provides multi-level protection on software program and data, and has self-check and self-recovery functions.

The board software provides mirror protection on important registers, thusprotecting the hardware against the influence of any abnormalities like voltagefluctuation.

All the inter-board communication adopts check and retransmissionmechanism to avoid any error on the link transmission of the hardware.


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The board software provides mirror protection on important registers, thus

protecting the hardware against the influence of any abnormalities like voltagefluctuation.

Software is made more reliable with software platform technique, code sharingand multiplexing, and extensive multiplexing of available mature softwaremodules.

1.4 Data Security

The security is improved by adopting database module to perform unifiedmanagement on the data.

Both the database and its files have their own data check function. The database files are provided with hierarchical protection according to the

importance of the data, so that the error in the lower-level database will notaffect the higher-level database.

In FLASH two backups for the database are available, which serve as thebackup for each other


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2 Network Protection

The OptiX Metro 500 has good network self-healing protection capability, andprovides path protection stated in ITU-T Recommendations. In case of fiber cut, lineboard damage or node failure, it will initiate protection for the service with theswitching time less than 50ms.

Below the path protection provided by the OptiX Metro 500 is discussed.

2.1 Two-fiber Unidirectional Path Protection

Ring

The protection switching principle of two-fiber unidirectional path protection ring isbridging at head-end and switching at tail-end. The two-fiber unidirectional pathprotection ring utilizes one optical fiber, called fiber S or working fiber, to transmitservice signals and another one, called fiber P or protection fiber, to transmit the samesignals for protection. When all the nodes in the ring work run normally, they transmitsignals in the same direction as they receive signals. That is, if a node transmitssignals in clockwise direction it will receive signals in clockwise direction. But the routeis diverse. For example, the route of traffic signals transmitted from station A to station

C is A B C while the route of traffic signals transmitted from station C to station A is

C D A. The intermediate stations passed by are different, as shown in Figure 10.


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A

B

C

D

S

S

P

P

CA AC

ACCA

A

B

C

D

S

S

P

P

CA AC

ACCA

(a)

(b)Switching

Figure 10 Two-fiber unidir ectional path protection ring

In normal status the signal flow is shown in Figure 10 (a). Traffic signal AC is added tothe ring at node A with node C as destination, and then is transmitted over fibers S

and P at the same time. And fiber S sends the traffic signal to node C through node Bclockwise, while fiber P sends the same signal to C through D as a protection signal.Node C selects to drop the traffic signal with better quality from two directions.Normally it receives traffic signal sent over fiber S). Likewise, the traffic signals thatenter the ring at node C with node A as destination are sent to node A in the sameway.

Once the fiber between nodes B and C is broken, as shown in Figure 10 (b).At node C,since AC signal received from fiber S is lost, the switching switch will switch to receiveAC signal transmitted from node A via fiber P, thus services between node A and


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node C are protected.After the fault is removed, the switching switch will replace to its

original position generally after continuous detection lasting for 10 minutes.Theservice from node C to node A needs no switching.

2.2 Two-fiber Bidirectional Path Protection

Ring

The protection switching principle of two-fiber bidirectional path protection ring issimilar to that of unidirectional path protection ring except that the routes for signalreceiving and transmission in bidirectional protection ring are identical, as shown inFigure 11.


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A

B

C

D

S1

P2

S2

P1

CA AC

ACCA

A

B

C

D

S1

P2

S2

P1

CA AC

ACCA

(a)

(b)

Switching

Switching

Figure 11 Two-fiber bidirectional path protection ring

Figure 11(a) shows the signal direction in normal status. Traffic signal AC that enters

into the ring from node A with node C as destination is sent over fiber S1 and fiberP1simultaneously. Fiber S1 transmits the traffic signal to the destination node C vianode B in the clockwise direction, while fiber P1 transmits the same signal asprotection signal to the destination node C via node D in the counter-clockwisedirection.Node C drops the signals sent over fiber S1, which serve as working signal.Similarly, traffic signal CA that enter the ring at node C with node A as destination issimultaneously transmitted over both fiber S2 and fiber P2. Fiber S2 transmits thetraffic signal to the destination node A via node B in the counter-clockwise direction,while fiber P2 transmits the same signal as protection signal via node D to the


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destination node A in the clockwise direction. Node A receives the traffic signal sent

over fiber S2, which serve as working signal.

Note:

The difference between a bidirectional ring and a unidirectional ring is as follows: Innormal situation, the service signals from node A to node C on a bidirectional ring istransmitted in the clockwise direction, and the service signals transmitted from node Creach node A in the counter-clockwise direction. On a unidirectional ring, the servicesignals from node A are transmitted to node C in the clockwise direction, and theservice signals from node C to node A are also transmitted in the clockwise direction.

Suppose that the optical fiber between nodes B and C is cut off, as shown in Figure 1(b).At node C, since AC signal transmitted over fiber S1 is lost, the switching switch ofnode C will switch to fiber P1 to receive AC signal sent from node A over fiber P1, thusprotecting traffic signal between node A and node C. The switching switch will usuallyrestore to its original position when the fault has been eliminated.At node A, since CAsignal transmitted over fiber S2 is lost, the switching switch of node A will switch tofiber P2 to receive CA signal sent from node C over fiber P2, thus protecting trafficsignal between node C and node A. The switching switch will usually restore to itsoriginal position when the fault has been eliminated.


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2 OptiX iManager T2000

The OptiX Metro 500 product is managed by the OptiX iManager T2000 NMS. TheOptiX iManager T2000 has been designed, with strict process managementtechnique (such as RUP, CMM) and multiple advanced design and developmentmethods employed, to realize a new generation of iMAP network managementarchitecture. The OptiX iManager T2000 can:

(1) Respond more rapidly to the demands of the user and managementequipment.

(2) Provide more practical and powerful management function desired by theuser.

(3) Provide end-to-end trail management function.

According to relevant ITU-T Recommendations about TMN, the managementfunction of the telecommunication network has five layers, namely from down to top,Network Element Layer (NEL), Element Management Layer (EML), NetworkManagement Layer (NML), Service Management Layer (SML) and BusinessManagement Layer (BML).

The functions of respective layers are as follows:

(1) NEL, with the functions realized mainly in the network equipment, is capableof configuration management, fault management, performance management,etc. of a single NE. Meanwhile, it can respond to various events, e.g. pathrecovery for protection, by using the control management informationtransferred in the overhead of SDH. OptiX series host equipment achieves

whole NEL functions.(2) EML controls the equipment directly and provides such functions as

configuration management, fault management, performance managementand security management.

(3) NML, engaged in surveillance and control over the network equipment withinits management scope, shall have the main management functions requiredby TMN.

(4) SML, with the emphasis on contract and order management, is the basiccontact point with the users in providing and terminating service, accounting,service quality, fault report, etc.

(5) BML is mainly engaged in the overall planning and the agreementsconcluded with the operators.

According to actual users requirements, OptiX iManager T2000 also provides part ofnetwork-level management system function, such as end-to-end trail managementand resource management, while providing NE-level management system functions.Based on the excellent design, it offers a good performance/price ratio of the ElementManagement System/Sub-Network Management System (EMS/SNMS) in themarket of optical networks worldwide.

iManager T2000 has the following management functions of Sub-NetworkManagement Layer (SNML):


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Trail management

Network protection and network resource management

Service guarantee

DCN network management

Management of equipment physical position and topological connectionrelation

These SNML functions are implemented in the view. To realize simple and effectiveoperation and maintenance, the user only needs to adopt configuration andmanagement by point and click.


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1.2 Interface Type

Table 3 shows types of interfaces provided by the OptiX Metro 500.

Table 3 Types of interfaces

Interface type Interface rate and feature

Electrical interface 2048kbit/s

Optical interface 155520kbit/s

Auxiliary interface NM interface (10M Ethernet interface)

One RJ-45 transparent data interface

Three Boolean input interfaces and one Boolean outputinterface

One RJ-45 clock output interface

2. Electrical interface

Table 4 shows types of electrical interfaces provided by the OptiX Metro 500, whichcomply with ITU-T recommendation G.703.

Table 4 Types of electrical interfaces

Electricalinterface rate

Code type Transmission media

2048kbit/s HDB3 120Balanced line; 75 unbalanced line

3. Optical interface

Table 5 shows types of optical interfaces provided by the OptiX Metro 500, whichcomply with ITU-T recommendation G.957.

Table 5 Types of optical interfaces

Optical interface Interface type

STM-1 optical interface S-1.1/L-1.1/L-1.2

Laser security: It has laser shut-off function, complying with ITU-T recommendationG.958.

Optical fiber connector: SC/PC.


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4. Auxiliary interface

Table 6 shows auxiliary interfaces provided by the OptiX Metro 500.

Table 6Auxiliary interfaces

Management interface Ethernet: RJ-45 interface (10M Ethernet interface)

Data interface One RJ-45 transparent data interface (with Max. rate of 19.2kbit/s)

Alarm Booleaninput/output interface

ALM IN/OUT: Three Boolean input interfaces and oneoutput interface (this will not available until the secondversion software is provided)

Clock output interface One 120clock output interface (this will not available untilthe second version software is provided)

1.3 Application Types

OptiX Metro 500 can be configured as ADM or TM.

1.4 Power Supply and Consumption

Power supply: Except the power interfaces of -48V DC and +24V DC, it offers theaccess of 220V AC, which widens its application scope.

Total power consumption: Less than 35W.

1.5 Mechanical Structure

The size of the OptiX Metro 500 is: 436mm (width) 293mm (depth) 42mm (height)

Table 7 shows the auxiliary cabinet.

Table 7 Mechanical structure of the auxiliary cabinet

600mm (width) 450mm (depth) 1,600mm (height)



Cabinet size(OptiX C seriescabinets)


1.6 Electromagnetic Compatibility (EMC)


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Electromagnetic compatibility of the OptiX Metro 500 complies with specifications of

ETS300386 and ETS300127. Table 8 shows the details.

Table 8 Electromagnetic compatibility of the OptiX Metro 500

Radiated emission Complying with the specifications of EN55022

Conducted emission Complying with the specifications of EN55022

Electrostatic discharge Complying with the specifications of EN61000-4-2

Inject current Immunity Complying with the specifications of ENV50141

Immunity to radiatedelectromagnetic fields

Complying with the specifications of ENV50140

1.7 Environment Requirements

Table 9 shows environment conditions required by the OptiX Metro 500 .

Table 9 Environment requirements

Environmentrequirements

ItemTemperature Humidity

Operating range of expectedperformance

0C ~ 45C 10 ~ 90%

Short-term work range -5C ~ 50C 5 ~ 95%

Transport and storage -40C ~ 70C 95%

*Short-term: Indicates the period of continuous operation is not more than 72 hours, and

the annual operation period is not more than 15 days.


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2 Major Indices

This section lists ITU-T specifications related to transmission systems, such as thosefor optical/electrical interfaces, clock synchronization, EMC and environment, alongwith actual test results of the OptiX Metro 500 system.

2.1 Optical Interface Specifications

1. Parameter specifications for optical interfaces

(1) Classification of optical interfaces

Different launched optical powers and receiver sensitivities may lead to differentpossible transmission distances. Table 10 shows the classification of opticalinterfaces supported by the OptiX Metro 500.

Table 10 Classification codes of optical interfaces

Inter-office communicationApplication

Short-haul Long-haul

Nominal wavelength (nm) 1310 1310 1550

Optical fiber type G.652 G.652 G.652

Type S-1.1 L-1.1 L-1.2

STM-1Transmissiondistance (km)

30 50 90

(2) Optical interface parameters

Table 11 shows the specifications for the parameters of optical interfaces provided bythe OptiX Metro 500.


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Table 11 Parameters spec ified for STM-1 optical interface

Item Unit Value

Nominal bit rate kbit/s STM-1 155520

Classification code - S-1.1 L-1.1 L-1.2

Operating wavelength range Nm 1261-1360 1280-1335 1480-1580

Source type - MLM MLM SLM

-Max. RMS spectrum width () Nm 7.7 3 -

Max. -20dB spectrum width Nm - - 1

-Min. side mode suppressionratio

dB - - 30

Max. mean launched power dBm -8 0 0

Min. mean launched power dBm -15 -5 -5

Characteristicsof transmitter atpoint S

Min. extinction ratio dB 8.2 10 10

Attenuation range dB 0-12 10-28 10-28

Max. dispersion ps/nm 96 246 NA

Min. optical return loss of cableat point S (including any

connectors)

dB NA NA 20Characteristicsof optical path at

point SR

Max. discrete reflectancebetween points S and R

dB NA NA -25

Min. sensitivity dBm -28 -34 -34

Min. overload point dBm -8 -10 -10

Max. optical path penalty dB 1 1 1

Characteristicsof receiver atpoint S

Max. reflection coefficient ofreceiver at point R

dB NA NA -25

2. Mean launched power

Table 12 shows indices for mean launched power of respective types of opticalinterfaces provided by the OptiX Metro 500.


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Table 12 Mean launched power

Optical interfacelevel

Optical interface typeStandard requirements(dBm)

S-1.1 -15 ~ -8

L-1.1 -5 ~ 0STM-1

L-1.2 -5 ~ 0

3. Extinction Ratio (EX)

Table 13 shows indices for extinction ratio of respective types of optical interfacesprovided by the OptiX Metro 500.

Table 13 Extinction Ratio (EX)


Optical interface type Standard requirements (dB)

S-1.1 > 8.2

L-1.1 > 10STM-1

L-1.2 > 10

4. Receiver sensitivity (BER=110-10)

Table 14 shows indices for receiver sensitivity of respective types of optical interfacesprovided by the OptiX Metro 500.

Table 14 Table 5 Receiver sensitivity

Opticalinterface level

Optical interface type Standard requirements (dBm)

S-1.1 < -28

L-1.1 < -34STM-1

L-1.2 < -34

5. Receiver overload optical power (BER=110-10)

Table 6 shows indices for receiver overload optical power of respective types ofoptical interfaces provided by the OptiX Metro 500.


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Table 15 Receiver overload power


Optical interface type Standard requirements (dBm)

S-1.1 > -8

L-1.1 > -10STM-1

L-1.2 > -10

6. Permitted frequency deviation of optical input interface

Table 16 shows indices for permitted frequency deviation of optical input interface ofrespective types of optical interfaces provided by the OptiX Metro 500.

Table 16 Permitted frequency deviation of optical input interface

Optical interface level Standard requirements (ppm)

STM-1 !20

7. AIS bit rate of optical output interface

Table 17 shows indices for AIS bit rate of optical output interface of respective types ofoptical interfaces provided by the OptiX Metro 500.

Table 17 Output AIS bit ra te

Optical interface level Standard requirements (ppm)

STM-1 !20

2.2 Electrical Interface Specifications

1. AIS bit rate of electrical output interface

Table 1 shows indices for AIS bit rate of electrical output interface of respective typesof electrical interfaces provided by the OptiX Metro 500.

Table 18 Table 1 AIS bit rate of electrical output interface

Electrical interface type Specification requirements (ppm)

2048kbit/s 50


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2.4 Jitter Performance Specifications

1. Output jitter of the SDH STM-1 synchronous interface

Table 22 shows output jitter indices of STM-1 interfaces provided by the OptiX Metro500.

Table 22 STM-1 output in terface jitter

Output jitter (Ulp-p)

B1 (f1~f4) B2 (f3~f4)Optical interfacelevel

Optical interfacetype Specification

requirements

Specification

requirementsS-1.1 0.50 0.10

L-1.1 0.50 0.10STM-1

L-1.2 0.50 0.10

2. Input jitter and wander tolerance of the SDH STM-1 interface

Table 23 and Table 24 show indices for the input jitter tolerance of STM-1 interfacesprovided by the OptiX Metro 500.

Table 23 Input jitter tolerance of the STM-1 interface

Jitter tolerance

Specification requirements (UI)STMlevel Jitter

frequencyf1

Jitterfrequencyf2

Jitterfrequency f3

Jitterfrequency f4

STM-1 G.958 G.958 G.958 G.958

Table 24 Frequency justifi cation column width of jitter measurement filter

STM level f1 (Hz) f2 (kHz) f3 (kHz) f4 (MHz)STM-1 500 6.5 65 1.3

3. Input jitter and wander tolerances of the PDH tributary interface

Table 25 and Table 26 show input indices for the jitter tolerance of PDH tributaryinterfaces provided by the OptiX Metro 500.


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Table 25 Input jitter tolerance of the PDH tributary interface

Jitter tolerance

Specification requirements (UI)Tributaryrate(kbit/s) Jitter

frequency f1Jitterfrequency f2

Jitterfrequency f3

Jitterfrequency f4

2048 G.958 template G.958 template G.958 template G.958 template

Table 26 Frequency of jit ter measurement filter

Tributaryrate (kbit/s)

f1 (Hz) f2 (kHz) f3 (kHz) f4 (kHz)

2048 20 2.4 18 100

4. Mapping jitter of the PDH tributary interface

Table 27 shows indices for the mapping jitter of the PDH tributary interfaces providedby the OptiX Metro 500.

Table 27 Mapping jitter of the PDH tributary interface

Mapping Jitter (UIp-p)

Specification requirementsElectrical interfacetype

B1 (f1~f4) B2 (f3~f4)

2048kbit/s Needs further study 0.075

5. Combined jitter of PDH tributary interface

Table 28 shows indices for the combined jitter of the PDH tributary interfaces providedby the OptiX Metro 500.

Table 28 Combined jitter of PDH tributary interface

Reverse polarity single

pointer (Uip-p)

Regular Pointers (Uip-p)Electrical

interface typeB1 B2 B1 B2

2048kbit/s 0.4 0.075 0.4 0.075


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Terms and Abbreviations


System Description

Abbreviations and

Acronyms Full name

HDB3 High Density Bipolar of order 3 code

IC Integrated Circuit

ITU-T Telecommunication Sector

MADM Multiple

MLM Multi Longitudinal Mode

MSTP Multi-service Transmission Platform

NE Network Element

OAM Operation, Administration and Maintenance

OAM&P Operation, Administration, Maintenance and Provisioning

ODF Optical Distribution Frame

PDH Plesiochronous Digital Hierarchy

RMS Root Mean Square

SDH Synchronous Digital Hierarchy

SLM Signle Longitudinal Mode

STM Synchronous Transport Module

TM Termination Multiplexer

TMN Telecommunication Management Network

VC Virtual Container

OptiX Metro 500 System Description

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