oms850 product description

OMS850STM-1 Multi Service Transmission Platform (MSTP)

Product Description

Document code: 1AFA60681AAU

Product Description OMS850

Date of issue:Draft Issue:Comments:

7-05-20051.0b

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Table of Content

of 36 Copyright – Refer to Page 2

OMS850 Product Description

1 Introduction.................................................................................................................7

1.1 General.......................................................................................................................71.2 Overview.....................................................................................................................71.3 Features and Benefits.................................................................................................81.4 Main Features.............................................................................................................9

2 Network Applications................................................................................................12

2.1 SDH Service Application...........................................................................................122.2 Application in Mobile Network...................................................................................132.3 Ethernet Service Application.....................................................................................142.3.1 Point-to-Point Transparent Transmission..................................................................142.3.2 VLAN Convergence..................................................................................................152.3.3 Layer 2 Switching......................................................................................................162.4 DDN Service Application...........................................................................................172.4.1 Point-to-point Transmission of the N × 64 kbit/s Service..........................................172.4.2 Point-to-point Transmission of the Framed E1 Service............................................182.4.3 Transmission of the N × 64 kbit/s Service and the Framed E1 Service....................182.4.4 Integration of the N × 64 kbit/s Service.....................................................................19

3 Equipment Implementation.......................................................................................20

3.1 Equipment Structure.................................................................................................203.1.1 OMS850 Type I.........................................................................................................203.1.2 OMS850 Type II........................................................................................................223.1.3 Integrated System Unit (ISU) & Extended Slot.........................................................233.1.4 16 × E1 interfaces Board..........................................................................................263.1.5 2-Port 10M/100M Ethernet Interface board..............................................................263.1.6 N×64kbit/s Interface Board.......................................................................................273.1.7 EFT Board.................................................................................................................28

4 Protection Mechanisms............................................................................................30

4.1 Uni/Bi-directional Path Protection.............................................................................304.2 Linear MSP...............................................................................................................30

5 Network Management...............................................................................................31

5.1 Overview...................................................................................................................315.2 Element Management (SDH and Data Domains).....................................................31

6 Data Summary..........................................................................................................32

6.1 Interface Types.........................................................................................................326.1.1 Electrical Interfaces...................................................................................................326.1.2 Optical Line interfaces...............................................................................................336.1.3 Ethernet Interfaces....................................................................................................336.1.4 Clock Interfaces........................................................................................................336.1.5 Timing and Synchronisation Interface.......................................................................336.2 Application and Cross Connection............................................................................346.3 Power Supply............................................................................................................346.4 Environment..............................................................................................................346.5 Electromagnetic and Electrostatic Compatibility.......................................................35

Draft Issue 1.0 Copyright – Refer to Page 2 of 36


List of Figures

Figure 1: OMS850.............................................................................................................7Figure 2: Outer view of the OMS850................................................................................8Figure 3: Network Application of OMS850......................................................................13Figure 4: SDH Multiplexing Structure..............................................................................14Figure 5: Application of GSM..........................................................................................14Figure 6: Point-to-Point Transparent Transmission of Ethernet Services (Chain Network)15Figure 7: Point-to-Point Transparent Transmission of Ethernet Services (Ring Network)16Figure 8: VLAN Convergence of Ethernet Services (Chain Network).............................16Figure 9: VLAN Convergence of Ethernet Services (Ring Network)...............................17Figure 10: Ethernet Service Layer 2 Switching.................................................................18Figure 11: Point-to-Point Transmission of the Nx64kbit/s Service....................................18Figure 12: Point-to-Point Transmission of the Framed E1 Service...................................19Figure 13: Point-to-Point Transmission of the Nx64kbit/s Service and the Framed E1 Service

………………………………………………………………………………………..19Figure 14: Integration of the Nx64kbit/s Service...............................................................20Figure 15: Outer view of the OMS850 Type I & II.............................................................21Figure 16: OMS850 Type I................................................................................................21Figure 17: Wiring area of the rear of OMS850 Type I & II................................................23Figure 18: Structure of OMS850.......................................................................................24Figure 19: Working Principle of the ISU............................................................................25Figure 20: OMS850 Management Principle ……………………………………………. . 32

List of TablesTable 1: Interfaces on the Front Panel of ISU...............................................................23



List of Abbreviations

ADM Add-Drop MultiplexerAIS Alarm Indication SignalAU Administrative UnitAUG Administrative Unit GroupAUI Adaptation Unit InterfaceAUX Auxiliary (Unit, Channels, Services)BIP Bit Interleave ParityC ContainerCRC Cyclic Redundancy CheckDC Direct CurrentDCC Data Communication ChannelDCN Data Communication NetworkDEG DegradationDXC Digital Cross–ConnectEMC Electromagnetic CompatibilityEOW Engineering Order WireEPL Ethernet Private LineETS European Telecommunications StandardETSI European Telecommunication Standardization InstituteGFP Generic Framing ProcedureISDN Integrated Services Digital NetworkISU Integrated System UnitITU-T International Telecommunication Union, Telecommunications SectorLAN Local Area NetworkLAPS Link Access Procedure – SDHLCAS Link Capacity Adjustment Scheme (for Virtual Concatenated signals)LCT Local Craft TerminalLOF Loss of FrameLOP Loss of PointerLOS Loss of SignalLTU Line Termination UnitMS-AIS Multiplex Section – Alarm Indication SignalMS Multiplex SectionMSP Multiplex Section ProtectionMV36 Marconi Communications Element Level Management SystemMV38 Marconi Communications Network Level Management SystemNE Network ElementNMS Network Management SystemOMS850 Customer Premises Add/Drop Multiplexer with Ethernet FunctionalityOSI Open System InterconnectionPDH Plesiochronous Digital HierarchyPOH Path OverheadPSU Power Supply UnitQoS Quality of ServiceRS Regeneration SectionSCC System Control and CommunicationSDH Synchronous Digital HierarchySETG Synchronous Equipment Timing GeneratorSFP-MSA Small Form factor Pluggable, Multi Source AgreementSIU Slide in Unit



SMA Synchronous Multiplexer Add/DropSNCP Sub-Network Connection ProtectionSOA Service On AccessSOH Section OverHeadSOO Service On OpticalSSMB Synchronous Status Message ByteSTM-N Synchronous Transport Module - NTCM Tandem Connection MonitoringTDM Time Division MultiplexTLS Transparent LAN ServiceTM Terminal MultiplexerTMN Telecommunication Management Network TU Tributary UnitTUG Tributary Unit GroupUK United KingdomVC Virtual ContainerVC 12 Virtual Container Level (12)VU Vertical UnitVPN Virtual Private Network

Foreword

The product information contained herein is independent by a product release an does not refer to a defined product release. The technical information provided in this document is offered, in good faith, as an indication of Marconi's intention to evolve its Optical Networks portfolio to meet the demands of the marketplace. Unless commercially agreed, the information contained herein should not to be taken as implying any commitment or obligation on the part of Marconi.



1 Introduction

1.1 General

The OMS850 is a new product in Marconi’s Next-Generation Lower Order SDH family. It is a cost-efficient, next-generation STM-1 multiplexer optimised to improve the bandwidth utilization and management efficiency of optical transmission networks, and to transmit and manage STM-1, E1/T1, E3/DS3, N x 64 kbit/s and Ethernet services. It supports Ethernet, synchronous digital hierarchy (SDH), and plesiochronous digital hierarchy (PDH), to transmit voice and data services on a single platform efficiently. It can operate at STM-1 in a ring or point-to-point configuration, with efficient use of space and in-service up-gradeability to cater for traffic growth.

This document is structured to provide an overview of the OMS850 product. The first section provides an introduction to this new product incorporating overview of the functions, main features and benefits, the second section details the network applications of the equipment. Implementation details are in section 3, Protection Mechanisms in section 4, Network Management in section 5, followed by Data Summary in section 6. Note: The information provided in this Product Description is subject to change.

1.2 Overview

The OMS850 is a compact ADM, which is optimised for the low cost delivery of a dedicated Ethernet Service as well as TDM service to small and medium business customers. The OMS850 differs from the existing units, as it does not require a host platform. The function is integrated within a full feature SDH ADM. It is targeted at those applications, which do not require high port densities but a mix of different tributary types/units. Two types of OMS850 are developed to meet different applications and requirements. The diagram below shows the outer view of the OMS850 - (i) Type I and (ii) Type II.


Figure 1: OMS850


1 2

The OMS850 is another new product developed to compliment the Marconi’s SDH portfolio to address the growing demand. It satisfies the growing end-customer needs for high-speed data transport in the WAN. The OMS850 provides cost effective solutions for the delivery and efficient transport of Ethernet Services from an SDH infrastructure.

It provides significant benefits for operators in delivering frame and packet based services such as Ethernet transport and IP access. It also enables the network operators to extend the monitoring of packet delivery to customer premises.

It also provides scaleable solutions, which can be equipped, in service, in line with customer demand. It allows transport over SDH of traffic presented as Ethernet frames. Inter-operable with the Marconi Release 2 range of products, uses GFP, VC and LCAS technologies.

This document covers the description of the OMS850 (flexible mapping product). It is intended to give the key customers early visibility of the product, in order to test the intended features and establish the validity of the product concept.

1.3 Features and Benefits

The OMS850 product provides efficient mapping of packets into SDH for transmission over the wide area. The OMS850 is a full feature STM-1 ADM. It can be deployed at STM-1 in ring and as well as for terminal applications. In addition to E1/T1, E3/DS3, n x 64 kbit/s interfaces it also presents Ethernet interfaces to the end user equipment as well as supporting Layer 2 application. These interfaces can be configured as 10BASE-T or 100BASE-TX. Packets received over the Ethernet interface are mapped into SDH VCs, or SDH VC groups created using virtual concatenation.

Full Feature STM-1 Add/Drop Multiplexer

STM-1 (155 Mbit/s) aggregate.


Figure 2: Outer view of the OMS850


Full configuration, fault, performance management and inventory features. Software download.

Presentation of Standard Ethernet Interfaces to Customer Equipment

10/100Mbit/s operation with autonegotiaion. Frame level monitoring of Ethernet at the point of delivery.

PDH Service Access Access PDH services of E1/T1 and E3/DS3 levels. It can access up to 16 E1 services,

16 T1 services or 3 E3/DS3 services.

DDN Service Access

The n x 64 board accesses the digital data network (DDN) service, provides two V.35/V.24/X.21/RS-499/EIA-530 interfaces and two Framed E1 interfaces and supports 64 kbit/s timeslot cross-connection for the services.

Provides two V.35/X.21/RS-449/EIA-530 interfaces and two Framed E1 interfaces, whose characteristics are compliant with related ITU-T Recommendations and EIA standards.

Supports the integration of various signals based on different physical interface protocols such as V.35/V.24/X.21/RS-449/EIA-530, thus saving the transmission bandwidth.

Supports the timeslot cross-connection of the board service at the 64kbit/s level.

Processes the path overhead, configures E1 or N × 64 kbit/s service paths, monitors alarm and performance for them, and keeps the communication between the service paths and the SCC unit.

Efficient Transport of Ethernet Frames Over SDH

GFP Mapping of the Ethernet frames into SDH. Virtual concatenation for Aggregation of the n x VC-n groups across the SDH network. LCAS (Link Capacity Adjustment Scheme), to allow in-service resizing of the transport links. Use of such techniques ensures full interoperability with all GFP and LCAS capable

products.

Inherent SDH Benefits Brings Ethernet transport into the SDH world of secure transport and fast acting network

protection (e.g. SDH protection acting in under 50 ms).

High level of reliability and performance is obtained through the use of proven SDH technology.

1.4 Main Features

The OMS850 can transmit and concentrate Ethernet services.

Access and process 10/100 Mbit/s Ethernet services.

Support the transparent transmission, convergence and Layer-2 switching of Ethernet



services.

Support link capacity adjustment scheme (LCAS) to improve the bandwidth efficiency.

Support L2 virtual private network (VPN) service, Ethernet private line (EPL), Ethernet virtual private line (EVPL), Ethernet private LAN EPLn/EPLAN and Ethernet virtual private LAN (EVPLn/EVPLAN) services.

The OMS850 product provides efficient mapping of packets into SDH for transmission over the wide area. The product present RJ45 Ethernet interfaces to the end user equipment. These interfaces can be configured as 10BASE-T or 100BASE-TX. Packets received over the Ethernet interface are mapped into SDH VCs, or SDH VC groups created using virtual concatenation.

Ethernet Ports Allows transport over SDH of traffic presented as Ethernet frames. The maximum number of ports available is four. Gives the option of transport over the SDH network to multiple different destinations – one

destination for each of the Ethernet ports presented.

Data Features The card does not add more than a few milliseconds of latency to a connection passing

through the card. This latency target is independent of any end-to-end delay caused by differential delay along different transmission paths through the SDH network.

The Ethernet layer is capable of receiving and processing Ethernet frames of MTU lengths including extended frames. For Cisco ISL, VTP and CDP, and for IEEE802.1Q (VLAN) frame lengths a maximum frame length of 1548 bytes should suffice. However, a 1600 byte maximum frame length is transported.

Interworking Fast Ethernet links at VC-12-nv, VC-3-nv and VC-4 are possible between the card and other

10/100M Ethernet Tributary cards and expansion modules (Flexible Mapping) on the SMA range (Series 4, Series 3, Series 1.2) and MSH including OMS range.

Standards Compliance (LCAS and GFP) This product addresses the increasing market requirement to supply products based on ITU-

T standard mappings (such as GFP – Generic Framing Procedure), and to offer support of the LCAS (Link Capacity Adjustment Scheme) feature.

Service Interface and Management Interface

Interface type

Description

SDH service interface

STM-1 optical interface: S-1.1, L-1.1, L-1.2

PDH service interface

E1/T1, E3/DS3

Ethernet service

10Base-T, 100Base-TX



interface

DDN service interface

N x 64kbit/s, Framed E1

Clock interface One 75 ohm/120 ohm external clock interface

Clock signal: 2048 kbit/s or 2048 kHz

Alarm interface

3-input and 1-output Boolean alarm interface

Management interface

One auxiliary data interface for transparent transmission of serial data

One Ethernet management interface

Service Access Capability

Service type Maximum access capabilitySTM-1 2

E1 service 16

T1 service 16

E3/DS3 service 3

Fast Ethernet (FE) service 4

N x 64 kbit/s service 2

Framed E1 2



2 Network Applications

SDH is a matured technology for the high-speed data transport within public networks, both for reasons of resilience of service, fast restoration on link failure and flexibility of service. Adding retains these benefits, and also enables more efficient allocation of the SDH transmission capacity.

2.1 SDH Service Application

The OMS 850 can be configured as Terminal Multiplexer, Add/Drop Multiplexer and supports TM, ADM and DXC functionality.

Topology Network1 Chain

network

2 Ring network

Legend:


Figure 3: Network Application of OMS850


The implementation of SDH multiplexing structure is according to ITU-T G707 recommendation as described in the following figure.

2.2 Application in Mobile Network

The OMS850 can be used to transmit signals of mobile Base Transceiver Station (BTS), as shown in Figure. Two STM-1 rings receive E1 signal from BTS and transmit E1 signal to BSC. Then the STM-4 ring receive E1 signal from BSC and transmit E1 signal to MSC. The network management message of the two STM-1 rings is transmitted to STM-4 ring through ECC. Thus the Network Management System is able to manage the two STM-1 rings.


Figure 4: SDH Multiplexing Structure


2.3 Ethernet Service Application

The OMS850 integrates Ethernet service access on the SDH platform, allowing the transmission of data services at the same time of voice services. It supports Ethernet service convergence and Layer 2 switching, as well as virtual local area network (VLAN) and L2 VPN service defined by the IEEE.

2.3.1 Point-to-Point Transparent Transmission1. Chain NetworksThe Figure 6 below shows the topology of a typical point-to-point transparent transmission mode. Service A is transparently transmitted from Ethernet Port 1 of NE1 to Port 1 of NE3 over VC-Trunk A. Service B is transparently transmitted from Port 2 of NE1 to Port 1 of NE2 over VC-Trunk B.

VC-Trunk A

VC-Trunk B

Port 1

Port 2

Port 1

Port 1

NE1 NE3NE2


Figure 5: Application of GSM

Figure 6: Point-to-point transparent transmission of Ethernet services (Chain Network)

E1

STM-1 Ring

STM-1 Ring

STM-4 Ring

MSC

BTS

BTS

BTSBTS

BTS

BTS BTS BTS

BSC

E1

E1 E1

E1

BSC

Ecc E1

E1BSC

Ecc

E1

E1

E1

BTS Base Transceiver StationBSC Base Station ControllerMSC Mobile Switching Centre

STM-1 Ring

STM-4 Ring


2. Ring Networks

The ring networks provide SDH self-healing protection for the services to improve the reliability of data transmission. As shown in Figure 7, the Ethernet service from an NE is transmitted to the destination over an independent VC-Trunk for secure and reliable data transmission.

SDH self-healingprotection

1

3

45

2

VC Trunkn

NE 4

NE 1

NE 2

NE 3

2.3.2 VLAN Convergence

The OMS850 supports the VLAN function defined by IEEE802.1q to provide private network service for users.

1. Chain Networks

Figure 8 illustrates VLAN convergence of Ethernet services. The function can isolate users from each other for higher security. VLAN1 and VLAN2 of company A and VLAN2 of company B share the VC-Trunk 1, and VLAN1 of company B is transmitted over VC-Trunk 2.

VLAN 2

VLAN 1

VLAN 1 VLAN 2

VLAN 2

NE1 NE2 NE3Port 1Port 2

Port 1

VLAN 1 VLAN 2

VLAN 1

Port 1

Port 2

Port 3

VC-Trunk 1

VC-Trunk 2

A

B

LANSwitch

LANSwitch


Figure 7: Point-to-point transparent transmission of Ethernet services (Ring Network)

Figure 8: VLAN Convergence of Ethernet Services (Chain Network)


2. Ring NetworksAs shown in the Figure 9, services are classified by the port and the VLAN ID to part the VLAN of company A from that of company B. The VLAN1 of company A and VLAN1 of company B share a VC-Trunk; VLAN2 of company A and VLAN2 of company B share a VC-Trunk; and VLAN3 of company A and VLAN3 of company B share a VC-Trunk.

All services of company A are concentrated at NE1, to be output through an FE interface to the LAN switch for processing.

VLAN 1

VLAN 2

VLAN 3

VLAN 1

VLAN 2VLAN 3

Branch

VLAN 2

VLAN 3

VLAN 1 VLAN 2

VLAN 3

Headquarters ofCompany A

VLAN 1

1 3

2

VC Trunkn

SHR

NE 1

NE 2

NE 3

NE 4

Headquarters ofCompany B

Branch

Branch

2.3.3 Layer 2 Switching

The OMS850 supports Layer 2 switching of Ethernet services. The accessed data is transmitted according to the media access control (MAC) address.

As shown in the Figure 10, company A and company B have Ethernet services at the four NEs. The services among NEs are not fixed, for example, the user of company A in NE3 needs to communicate with other users of company A in other three NEs. The Layer 2 switching function of the equipment can meet the requirement. Make related setting in NE3, and then the system will set up an MAC address table, which is updated periodically through the self-learning function. Therefore, the data that company A and company B access from NE3 may select different VCTRUNK according respective MAC address table, or share a VCTRUNK.

In this way, the system configuration is simplified, the bandwidth utilization is improved, and


Figure 9: VLAN Convergence of Ethernet Services (Ring Network)


the equipment is easier to be maintained and managed.A

B

NE1

A

B

AB

A

B

MAC Address VC-TrunkMAC 1 NE1 ①MAC 2 NE4 ②MAC 3 NE2 ③

… … …

NE2

NE3

NE41

23

SHR

nVC Trunk

NE3

2.4 DDN Service Application

The N 64 board is a multi-protocol board supporting ITU-T-compliant N × 64 kbit/s services. With this board, the Framed E1 service and the multi-protocol interface service such as V.35/V.24/X.21/RS-449/EIA-530 signals can be accessed to the transmission networks.

2.4.1 Point-to-point Transmission of the N × 64 kbit/s ServiceIn this case, the DDN users and DDN nodes can be interconnected through the interface V.35/V.24/X.21/RS-449/EIA-530. It is possible to configure the service type and amount on Network Management system as needed, as shown in the Figure 11.

Transport network(SDH or WDM)

Nx64kbit/s

DDNUser

Nx64kbit/s

DDN

:OptiX Metro 500

:Service connection

:DDN node:DDN Mutiplexer

NE1

NE2


Figure 10: Ethernet Service Layer 2 switching

: OMS850


2.4.2 Point-to-point Transmission of the Framed E1 ServiceAs shown in the Figure 12 below, the terminal office exchanges one-channel Framed E1 service with the remote central office through the OMS850.

Transport network(SDH or WDM)

Framed E1

:OptiX Metro 500

:Service connection

Framed E1

Centraloffice

NE1

NE2

2.4.3 Transmission of the N × 64 kbit/s Service and the Framed E1 Service

As shown in Figure 13, Router A exchanges the Framed E1 service with Router C, and Router B exchanges the N × 64 kbit/s service with Router D. NE A is an OMS850 which is connected with Router A and Router B through an N64 board. NE B is an OMS850, which is connected with Router C and Router D through an N64 board.

Transport network

Framed E1

Nx64k

:OptiX Metro 500

:Service connection

Nx64k

Framed E1

Router C

Router DRouter B

Router A

NE1 NE2

The N64 board of NE A converts the N × 64 kbit/s service coming from Router B into the Framed E1 service, then maps it together with the Framed E1 service from Router A into the VC-4. After cross-connection, the services are sent to the optical interface board, and then transmitted to NE B through SDH transmission networks. In NE B, the Framed E1 signals are separated from the SDH service dropped from the network. Then the N64 board converts these signals into N x 64 kbit/s service and Framed E1 service, and sends them to Router D and Router C respectively. The service in the opposite direction is just the inverse.


Figure 11: Point-to-Point Transmission of the N × 64 kbit/s Service

Figure 12: Point-to-Point Transmission of the Framed E1 Service

: OMS850

Figure 13: Transmission of the N × 64 kbit/s Service and the Framed E1 Service

:OMS850


If the service between Router B and Router D is NM service or monitoring service, featuring low traffic, N × 64 kbit/s rate and V.35 interface, and the service from Router A is Framed E1 service, NE A converts the N × 64kbit/s service sent from Router B to the Framed E1 service using the N64, and then performs timeslot cross-connection with the Framed E1 service coming from Router A. In this way the N × 64 kbit/s service is integrated with the Framed E1 service. The Framed E1 signal is mapped into VC-4, then sent to optical interface board after cross-connection, and then sent to NE B through the SDH transmission networks. In NE B, the Framed E1 signals are separated from the SDH service dropped from the network. Then the N64 board converts these signals into N x 64 kbit/s service and Framed E1 service, and sends them to Router D and Router C respectively. The service in the opposite direction is just the inverse.

2.4.4 Integration of the N × 64 kbit/s Service

Transport networkNx64k

:OptiX Metro 500

:Service connection

Nx64k

Router C

Router DRouter B

Router A

NE1 NE2

Nx64k Nx64k

As shown in Figure 14, Router A exchanges one-channel N × 64 kbit/s service with Router C, and Router B exchanges one-channel N × 64kbit/s service with Router D. Both NE A and NE B are the OMS850 systems installed with one N64 board. The N64 board of NE A accesses one-channel N × 64kbit/s services from Router A and Router B receptively, and converts them into the Framed E1 services. After the timeslot cross-connection, these two channels of signals are integrated into one-channel Framed E1 signal. Then the Framed E1 signal is mapped into VC-4, and after cross-connection, is sent to the optical interface board, and then sent to NE B through the SDH transmission networks. In NE B, the Framed E1 signals are separated from the SDH service dropped from the network. Then the N64 board converts these signals into two channels of N x 64 kbit/s services, and sends them to Router D and Router C respectively. The service in the opposite direction is just the inverse. The networking mode helps to save the transmission bandwidth.


Figure 14: Integration of the N × 64 kbit/s Service

: OMS850


3 Equipment Implementation

3.1 Equipment Structure

Two types of OMS850 have been developed to meet the requirements of customers.

1 2

3.1.1 OMS850 Type I

The OMS850 Type I is a case-shape system, consisting of chassis, power board, ISU board, extension slots and fan. The structure design complies with IEC297 standards. The dimensions of the chassis are 436 mm (W) x 293 mm (D) x 43 mm (H). All the boards are fixed in the chassis except those inserted in the extension slots. The tributary unit, line unit, cross-connect unit, clock unit and SCC unit are combined in the Integrated System Unit (ISU) board.

The Type I chassis has five mounting modes as follows:

On the wall.

In 19-inch cabinet.

In 300 mm deep ETSI cabinet.

In 600mm deep ETSI cabinet.

On the desktop.


Figure 15: Outer view of the OMS850 Type I & II


No.

silkscreen

Description Remarks

1 Grounding terminal The equipment connects with PGND of the equipment room through the terminal, indicating the equipment is grounded.

2 RUN Running indicator (green) Off: The equipment is not powered on.on for 0.5 second and off for 0.5 second: Waiting for loading programs.Quick flash: Loading program.Slow flash (on for 1 second and off for 1 second): Normal running.

CRT Critical alarm indicator (red) Off: No critical alarm.On: Critical alarm occurs.

MAJ Major alarm indicator (red) Off: No major alarm.On: Major alarm occurs.

ETN Network interfaced indicator Indicate the connection status of the network interface.

3 Two optical interfaces Three optical modules: S-1.1, L-1.1 and L-1.2; corresponding transmission distances: 30 km, 50 km and 90km.

4 RST Reset switch Reset the equipment.

5 SYNC Clock input/output interface One 120-ohm clock input/output.

6 ALARM Boolean value interface 3-input and 1-input interface.

7 ESD wrist strap jack

8 PW48 –48 V power board With +24 V power board and 220 V power board.

9 ON/OFF Power switch


Figure 16: OMS850 Type I


No.

silkscreen

Description Remarks

10 Indicator for the left optical interface

On: The receiving optical power is too low.

Off: Normal.

11 Indicator for the right optical interface

On: The receiving optical power is too low.

Off: Normal.

EHERNET NM interface

12 F2 Transparent data interface Used to transmit environment-monitoring data, RS-232 interface.

13 16 1 E1/T1 electrical interface Receive and transmit 16 E1/T1 signals.

14 16 1 Electrical interface of the extension slot

Transmit 16 E1 signal.

Hold board ET1D or N64

15 Fan

3.1.2 OMS850 Type IIThe Figure 17 shows the rear part of the OMS850 Type II. The dimensions of the equipment are 350 mm (W) x 300 mm (D) x 130 mm (H). The interface area of type II is the same as that of type I.

220V AC power board

Storage battery

interfaces

300mm

350mm

130mm


Table 1: Interfaces on the Front Panel of ISU

Figure 17: Wiring area at the rear of the OMS850 Type II


3.1.3 Integrated System Unit (ISU) & Extended Slot

The ISU integrates the SCC unit, line unit, tributary unit, clock unit, order wire unit and cross-connect unit. The extended slot can hold the E1, Ethernet Data and D64 boards.

The Integrate System Unit (ISU) accomplishes the functions of SCC unit, line unit,tributary unit, timing unit, order wire unit and cross-connect unit.

Supports up to 2 STM-1 optical interfaces. Supports three kinds of optical modules: S-1.1, L-1.1 and L-1.2. Supports up to 16 E1 interfaces. Supports up to 16 T1 interfaces. Supports two kinds of interface impedance, 75 and 120 . Supports one synchronous serial Interface Supports one external clock interface. Supports 3 Boolean inputs and 1 Boolean output. Supports SSM (Synchronization Status Message)

3.1.3.1 Functionality of the ISUThe ISU accomplishes the following functions:

Provides system control to the OMS850. Implements service configuration. Provides interfaces for NE communication and network management. Provides the extended slots with clocks. Controls one channel of 19.2kbit/s transparent data. Provides 8 or 16 2Mbit/s electrical interfaces with 75/120-ohm impedance. The

connector is DB78 type. Provides one or two STM-1 optical interfaces complying with G.707 Recommendation. There are three types of optical interfaces available, including S-1.1 (30km), L-1.1

(50km), L-1.2 (90km). SC/PC type connectors are used. The user can select the optical interface as per the requirements.

The working principle of the ISU is shown in Figure 19. It integrates the SCC, clock, order wire, tributary and cross-connect functions. The tributary unit receives/transmits the E1 electrical signals. Line unit receives/transmits the STM-1 optical signals. Cross-connect unit cross connects the VC-4 and VC-12 signals between the tributary and the line units. The timing unitsynchronizes the system and provides the clocks to the tributary, line and cross-connect units. The SCC unit controls the whole system and is responsible for the continuous system running. The order wire unit partially processes K byte and DCC, and transparently transmits the data and alarm information. Besides, the ISU also manages and controls the extended board.


Figure 18: Structure of OMS850


3.1.3.2 Tributary UnitThe ISU tributary unit maps accessed E1 (75 and 120 ) signals into the VC-4 and sends it to the cross-connect unit. Similarly it demaps the VC-4 coming from the cross-connect unit into the E1 signals. At the same time, the tributary unit reports performance and alarm data of each path to the SCC unit.

The tributary unit supports the following functions. Support up to 16 × E1. Support up to 16 ×T1. Support automatic protection switching function. Support inward loop and outward loop. Process VC-12 path overhead and monitor each service path

3.1.3.3 Line UnitThe ISU line unit performs the optical/electrical conversion of the STM-1 signal, extracts/inserts overhead bytes and generates the alarm signals on the line. It also supports inward loop and outward loop functions for fast and effective troubleshooting.

The line unit of the OMS850 receives/transmits the optical signal, and it accomplishes the following functions:

Supports up to 2 STM-1 optical interfaces. Automatic laser shutdown (ALS) function. Detects and reports various kinds of alarm signals and performance events on the lines. Provides the inward /outward loop function for fast and effective troubleshooting.


Figure 19: Working Principle of the ISU


3.1.3.4 Cross Connect UnitThe cross-connect unit can realize the service cross-connection at the VC-4 and VC-12 levels. It can cross-connect 6 x6 VC-4 at most. With the above-mentioned two cross-connection modes, the line and tributary services can be dispatched. Also, the configuration of equipment type, networking mode and protection mode can be achieved.

Following functionality is supported: Cross-connects line signals, line and tributary signals, and tributary signals. Add/drop the E1 tributary signals and freely allocate the VC-4s. Supports path protection and equipment protection. Supports multiple equipment configurations as well as multiple networking topologies

such as point-to-point, chain, and ring.

3.1.3.5 SCC Unit and Order Wire UnitFollowing functionality is supported:

Process and store the performance data and hardware alarms of the line, tributary, clock and order wire units.

Send the control and management information to the upstream or downstream NEs. Realize the real-time monitoring, maintenance, and management of the equipment. Assist NM system to manage the boards. Support DCC function. Access asynchronous serial data

3.1.3.6 Timing UnitTiming unit traces the external clock source or interface clock source and provides timing source to the board and system. Meanwhile, through system timing allocation, it provides each node of the data flow in the system with clock signals of proper frequency and phase, which enables the apparatus in each node to meet the requirements of the system-timing signal. It also provides the system with frame indication signals used to indicate the positions of the frame headers in the data.

Following functionality is supported: Provide synchronous clock for the line unit and the tributary unit of the system. Phase-locks and traces one-channel external timing signal and outputs one-channel

timing signal. Provide 5 timing source.

3.1.3.7 ISU SpecificationItem SpecificationsDimensions 208mm × 230mm × 2mmPower consumption 25WLine Side Bit rate 155Mbit/s

Pattern: scrambled NRZOptical modules: S-1.1,L-1.1,L-1.2Optical interface type: SC/PCOptical transmission distances: 30km, 50km and 90kmFollowed specifications: ITU-T

Tributary Side Bit rate: 2.048kbit/sPattern: HDB3Impedance: 75 or 120



Connector: DB78 connector

3.1.4 16 × E1 interfaces BoardIt can be plugged in the extend slot, and add/drop 16×E1 signals in the OMS850. According to the board interface impedance, it can be divided into two types: One is 75 unbalanced E1 service interface board, and the other is 120 balanced E1 service interface board.It maps accessed E1 (75 / 120 ) signals into a VC-4 to be sent to the cross-connect unit. Similarly it demaps VC-4 coming from the cross-connect unit into E1 signals. Moreover, it also reports the performance and the alarm data of each path to the SCC unit.

The E1 Interface board performs the following functions. Providing 75 unbalanced interface board and 120 balanced interface board. Signals are accessed from the front panel. A DB78 connector is used for both 75 and

120 interfaces for connection of coaxial cables and twisted-pair cables respectively. Features of interfaces meet the requirements specification in ITU-T Recommendation G.703.

Processing VC-12 path overhead, performing configuration, alarm and performance monitoring for each service path as well as communication between each service path and the SCC unit.

The process of asynchronously mapping and multiplexing 2.048Mbit/s signals into VC-4 complies with ITU-T Recommendation G.707.

The inward and outward loop testing function enables fast and effective troubleshooting. Providing two reference clock sources. Providing the re-timing function. The external system clock can be taken as the

reference clock to output E1 signals. Automatic protection switching. Path protection switching function can be set via NM

system. Whether path protection is initiated is determined by testing the deterioration of path signal on the active/standby rings using its dual-fed, signal selection function.

3.1.4.1 E 1 Interface Board Specification

Item SpecificationsDimensions 89.0mm (W) ×218.5mm(D) ×2.0mm(H).Power consumption

5.4W

Weight 0.25kgBit rate: 2048bit/sCode: HDB3Independence: 70 ohm or 120 ohmConnector: DB78

3.1.5 2-Port 10M/100M Ethernet Interface board.The 2-Port 10M/100M Ethernet Interface board can be inserted in the extended slot of the OMS850 to access 10M/100M Ethernet service. The 2 Port 10M/100M Ethernet Interface board performs the following functions:



Providing 2 × 10M/100M auto-negotiation Ethernet electrical interfaces. Ethernet signals are accessed via RJ-45 interfaces on the front panel.

The electrical features (such as flow control) of Ethernet interface follow IEEE 802.3x protocol.

1~2 10M/100M Ethernet frames can be mapped into 1~16 VC-12s. If Ni E1 signals can be mapped in each port, Ni is no more than 16. The total number of E1 signals mapped by the 2 Port 10M/100M Ethernet Interface board is 16 Ni, where i is the number of Ethernet interfaces on the 2 Port 10M/100M Ethernet Interface board, i=1~2.

Ethernet service accessed by the ET1D can be protected by the lower layer (e.g. SDH or optical) protection and achieves good QoS since Ethernet service is mapped into VC-12 for transmission.

Providing bandwidth sharing and statistical multiplexing based on the VLAN and port to improve bandwidth utilization ratio.

Providing Ethernet Layer 2 routing function. That is, get source MAC address and corresponding port information in the MAC frame from the input port and store in the board MAC address table to realize Layer 2 routing, and also support manually adding MAC address and corresponding port information to the MAC address table. The MAC address table capacity is 8k.

Providing security isolation among different users, and security isolation among different VLANs in the same user.

Supporting multicast and broadcast functions. The 2 Port 10M/100M Ethernet Interface board forwards broadcast packets to all ports of the same VLAN of the same user. The 2 Port 10M/100M Ethernet Interface board forwards multicast packets among multicast groups by setting up multicast address routing information through the IGMP SNOOPING function to prevent broadcast storm.

Supporting IEEE 802.1D Spanning Tree Protocol (STP) function to avoid failure in forwarding MAC frames, broadcast storm, error in MAC frame receiving sequence, and so on in the network topology with loops.

Supporting multiple inward loop and outward loop modes for troubleshooting. Providing the functions of flow statistics, report, alarm, etc.

3.1.5.1 2 Port 10M/100M Ethernet Interface Board Specification

Item SpecificationsDimensions 89.0mm (H) 218.5mm (W) 2.0mm (D)Power consumption

12.0W

Weight 0.26kg

3.1.6 N×64kbit/s Interface Board The N×64kbit/s Interface Board can be inserted in the extended slot. It can access 2× Framed E1 and 2 ×N×64kbit/s signals. The N ×64kbit/s interfaces support four interface protocols: V.35, V.24, X.21, RS-449 and EIA-530. The E1 signals are then mapped into the VC-4 to be sent to the cross-connect unit. In the reverse direction, the N64 board can demap the VC-4 signal coming from the cross-connect unit into 2 × V.35/V.24/X.21/RS-449/EIA-530 signals and 2 × Framed E1 signals. Meanwhile, the Nx64kbit/s Interface board can implement the integration of the E1 service and N × 64kbit/s service and timeslot extraction, and report its alarm and performance information to the System Control Unit.



The Nx64kbit/s Interface board performs the following functions:

Provides two V.35/V.24/X.21/RS-449/EIA-530 interfaces and two Framed E1 interfaces, whose characteristics conform to the specifications stipulated in the ITU-T Recommendations and EIA standards.

The N64 implements the cross-connect and scheduling of 2*Frame E1 and N*64kbit/s on the access side.

Supports the board configuration via the NM system. Supports the timeslot cross-connection of the board service at the 64kbit/s level. Processes the path overhead, configures 2Mbit/s or N × 64kbit/s service path and

monitors alarm and performance on the basis of per path, and keeps communications with the SCC unit.

Provides the inward loop and outward loop testing function, which enables fast and effective troubleshooting.

Supports automatic protection switching.

3.1.6.1 Nx64kbit/s Interface Board Specification

Item SpecificationsDimensions 89.0mm (H) 218.5mm (W) 2.0mm (D)Power consumption

4.0W

Weight 0.22kg

3.1.7 EFT BoardThe EFT board is a 10M/100M Ethernet transparent transmission board. It accesses4-channel 10M/100M Ethernet services, supports point-to-point transparent transmission and Ethernet over SDH (EOS).

The Ethernet Interface Unit (EFT) supports following functionalities:

Provides four 10 M/100 M Ethernet electrical interfaces and support access of 10BASE-T and 100BASE-TX.

Ethernet interface comply with IEEE 802.3x protocol. 1–4 10 M/100 M Ethernet services can be mapped into 1–63 VC-12s or 6 VC-3s. The maximum uplink bandwidth is 2 VC4s at the SDH side. Provides up to four VCTRUNKs. Supports link capacity adjustment scheme (LCAS). Supports transparent transmission of fast Ethernet services. Supports encapsulation protocols, including generic framing procedure (GFP), link

access protocol-SDH (LAPS), and high-level data link control (HDLC). Supports to receive and transmit test frames. Supports in-circuit test of recognition and transparent transmission of packet frame. Supports multiple inward loop and outward loop modes for troubleshooting

3.1.7.1 EFT Board Specification

Item SpecificationsDimensions 89.0mm (H) 218.5mm (W) 2.0mm (D)



Power consumption

8.0W



4 Protection MechanismsThe OMS850 supports uni/bi-directional path protection and linear multiplex section protection (MSP). In addition, it supports SNCP for the EFT only.

4.1 Uni/Bi-directional Path Protection

The OMS850 supports two-fiber unidirectional/bi directional path protection ring. It also improves the path protection on the software and hardware so that the typical switching time is less than 50ms recommended by ITU-T. The cut of time means great significance to the bit error sensitive services such as signaling, data and images.

4.2 Linear MSP

The linear MSP is applicable to chain networks. The OMS850 supports 1+1 and 1:N protection. In 1:1 protection mode, the protection system can bear extra services. In this case, the switching time is less than 50ms, specified in G.841 recommendations of ITU-T.



5 Network Management

5.1 Overview

The Network Management architecture for the OMS850 reflects the concept of integrating data capability into the existing SMA products; thus carrying data services over the SDH infrastructure. The management architecture exploits this integration whilst allowing the management of the data functions to be supported from a separate data management domain.

5.2 Element Management (SDH and Data Domains)

OMS850 is fully compatible to the SMA management concept. The management of the Data Domain uses the embedded domain management concept using the ‘Qx transparent messages’ transport (Qx tunnelling). The OMS850 represents a separate network element managed either by the service on optical or an LCT. The figure below shows the OMS850 management principle. The management protocol is Qx. Service On Access (SOA) as well as Service On Optical (SOO) manages the OMS850.


Figure 20: OMS850 Management Principle


6 Data Summary

6.1 Interface Types

Interface type Rate and characteristicEthernet interface 10BASE-T, 100BASE-TX

PDH/SDH electrical interface 1544 kbit/s, 2048 kbit/s, 34368 kbit/s, 44736kbit/s

SDH optical interface 155520 kbit/s

External clock interface 2048 kbit/s, 2048kHz

Alarm interface 3-input and 1-output alarm interface

Auxiliary interface Management interface, order wire interface, data interface

6.1.1 Electrical InterfacesElectrical interface types provided by the OMS850 system are listed in the following table, all of which are in compliance with ITU-T Recommendation G.703.

Electrical interface type

Code Bit rate at the output

Allowable attenuation at the input

Allowable frequency deviation at the input

Anti-interference capability at the input

1544 kbit/s B8ZS, AMI In compliance with G.703

2048 kbit/s HDB3 In compliance with G.703

34368 kbit/s HDB3 In compliance with G.703 -

44736 kbit/s B3ZS In compliance with G.703 -



6.1.2 Optical Line interfacesOptical interface types provided by the OMS850 system are listed in the table below, all of which are in compliance with ITU-T Recommendations.

Nominal bit rate 155520 kbit/sApplication code S-1.1 L-1.1 L-1.2

Working wavelength range (nm)

1261–1360 1280–1335 1480–1580

Source type MLM MLM SLM SLM

Transmitter at reference point S

In compliance with G.957

In Compliance with G.957



Optical Path between S and R

Receiver at reference point R

Laser security: In compliance with ITU-T Recommendation G.958.Optical fibre connectors: SC/PC and FC/PC.

6.1.3 Ethernet InterfacesInterface Type Interface Rate and FeatureRJ-45 electrical interface 10M/100M BASE-T auto sensing

6.1.4 Clock Interfaces

Clock type Feature descriptionExternal synchronization source

One output, 2048 kbit/s (G.703 §6) or 2048 kHz (G.703 §10), 120 ohm

Synchronous output One output, 2048 kbit/s (G.703 §6) or 2048 kHz (G.703 §10), 120 ohm



6.1.5 Timing and Synchronisation Interface

Output jitter Output frequency of internal oscillator under free-run mode

Long-term phase variation (locked)

In compliance with G.813 In compliance with G.813 In compliance with G.813

6.2 Application and Cross Connection

The OMS850 equipment can be configured as ADM as well as a TM. The system adopts 6 x 6 VC-4 full space division cross-connect matrix, thus able to realize adding/dropping any interface service and carrying the services between interfaces.

6.3 Power Supply

Three different types of power boards are available to support, -48V DC, +24V DC and 220V AC. The -48V DC power board is compatible with -60V DC input.

OMS850 Type IPower Input voltage range220 V AC 85 V –285 V

–48 V DC –36 V to –72V

+24 V DC 18 V–36 V

OMS850 Type II

220V AC with the voltage ranging from 85 V to 285 V

6.4 Environment

Environmental Requirements

ItemTemperature Humidity

Operating range of expected performance 00C-450C 10-90%

Short-term* working range -50C-500C 5-95%

Transportation and storage -400C-700C 95%



*Short-term: indicates the continuous working period is not more than 72 hours, and the annual accumulated working period is not more than 15 days.



6.5 Electromagnetic and Electrostatic Compatibility

The OMS850 is designed in compliance with ETSI ETS300 386 and ETS 300127 recommendation. The equipment has passed EMC-related tests.

Test item standards Test result

Conducted Emission EN55022 Class A Pass

Radiated Emission EN55022 Class A Pass

Electrostatic Discharge IEC (International Electrotechnical Commission) 1000-4-2 (Air Discharge:8 kV; Contact Discharge:6 kV)

Pass

Immunity To Radiated Electromagnetic Fields

IEC1000-4-3 (10 V/m) Pass

Electrical Transient/Burst Immunity IEC1000-4-4 (2 kV) Pass

Inject Current Immunity IEC1000-4-6 (3 V) Pass

End of Document


oms850 product description

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