BG-20

BroadGate™ BG-20

General Description

V 1.0

426006-2010-013-A00

BG-20 General Description

Catalog No: X33986

September 2005

1st Edition

© Copyright by ECI Telecom, 2005 All rights reserved worldwide.

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Contents 1 Introduction.............................................................................. 1-1

Overview .......................................................................................................... 1-1 BroadGate™ BG-20 - Miniature MSPP for Metro-Access Networks................ 1-3 Features and Benefits ...................................................................................... 1-4

2 Applications ............................................................................. 2-1 Overview .......................................................................................................... 2-1 Data Applications ............................................................................................. 2-1 Metro-Access Applications ............................................................................... 2-3 Cellular Applications......................................................................................... 2-4 Private Network Applications............................................................................ 2-5

3 System Architecture................................................................ 3-1 Overview .......................................................................................................... 3-1 TDM Configuration Options.............................................................................. 3-2 Data Services ................................................................................................... 3-3 Traffic I/O Interfaces......................................................................................... 3-5

4 System Design......................................................................... 4-1 Overview .......................................................................................................... 4-1 Common Process Functions ............................................................................ 4-2

5 Protection................................................................................. 5-1 Overview .......................................................................................................... 5-1 SDH Path/Circuit Protection Schemes ............................................................. 5-1 Ethernet Service Protection.............................................................................. 5-3 Summary of Protection Schemes..................................................................... 5-4

6 Management............................................................................. 6-1 Layered Architecture ........................................................................................ 6-2 Client/Server Architecture ................................................................................ 6-3 Integration with Other Products........................................................................ 6-3 LightSoft Network Manager.............................................................................. 6-3 EMS-BG-40 ...................................................................................................... 6-9 LCT-BG-40 - Advanced Graphical Craft Terminal.......................................... 6-10

7 Physical Description ............................................................... 7-1 Overview .......................................................................................................... 7-1 Rack Installation ............................................................................................... 7-2 MXC20 ............................................................................................................. 7-2

Contents BG-20 General Description

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Traffic Interface Module.................................................................................... 7-3 Power Feed Unit............................................................................................... 7-3

8 Specifications .......................................................................... 8-1 Cross-Connect Specifications .......................................................................... 8-1 Traffic Protection .............................................................................................. 8-2 Redundancy ..................................................................................................... 8-2 Synchronization................................................................................................ 8-2 Jitter and Wander ............................................................................................. 8-2 I/O Interfaces.................................................................................................... 8-2 Management .................................................................................................... 8-4 SDH Interfaces ................................................................................................. 8-4 Ethernet Specifications..................................................................................... 8-6 Physical Specifications..................................................................................... 8-7

A Reference Documents............................................................ A-1

B Glossary .................................................................................. B-1

9 Index .......................................................................................... I-1

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Table of Figures Figure 1: BroadGate™ BG-20........................................................................................ 1-3 Figure 2: Typical Ethernet application............................................................................ 2-2 Figure 3: IP DSLAM aggregation application................................................................. 2-3 Figure 4: BG-20 in a metro-access application.............................................................. 2-4 Figure 5: BG-20 in a cellular application ........................................................................ 2-5 Figure 6: BG-20 in a private network application ........................................................... 2-6 Figure 7: BG-20 as a multi-ADM/TM.............................................................................. 3-3 Figure 8: Timing distribution block diagram ................................................................... 4-5 Figure 9: Ethernet functionality ...................................................................................... 4-7 Figure 10: Path protection switching in a bidirectional self-healing ring ....................... 5-2 Figure 11: ECI Telecom's layered architecture management concept .......................... 6-2 Figure 12: LightSoft main window.................................................................................. 6-5 Figure 13: Shelf view as displayed in the EMS-BG-40 .................................................. 6-9 Figure 14: Shelf view as displayed in the LCT-BG-40 ................................................. 6-10 Figure 15: BG-20 front view ........................................................................................... 7-1

Table of Figures BG-20 General Description

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List of Tables Table 3-1: BG-20 interfaces capacity............................................................................. 3-5 Table 5-1: Traffic protection schemes............................................................................ 5-4 Table 7-1: List of cards................................................................................................... 7-2

List of Tables BG-20 General Description

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In This Chapter Overview .................................................................................... 1-1 BroadGate™ BG-20 - Miniature MSPP for Metro-Access Networks..................................................................................... 1-3 Features and Benefits.................................................................. 1-4

Overview The new information era has brought about remarkable growth in telecommunication services, the most dominant being the Internet. In this frantic environment, DWDM has proved extremely efficient in handling the enormous capacity required by the WAN, SDH provides the most reliable transport, and new developments in the access layers are bringing a greater number of services to end-0users. As a result, the MAN has become a bottleneck of high traffic demand, diverse technologies, and a multitude of clients requesting more and varied services at less cost.

The need for data connectivity across the WAN/MAN is ever growing. Enterprises with geographically distributed offices want to expand their Ethernet-based LANs to connect remote branches to their headquarters and their business to the Internet. Internet Service Providers (ISPs) and other Application Service Providers (ASPs), such as Storage Service Providers (SSPs), require data connectivity to connect their Points of Presence (PoPs) and reach their customers. Moreover, mobile operators' demand for Ethernet connectivity is on the rise, as they seek to exploit their massive presence in metro areas to provide new services.

1 1 Introduction

Introduction BG-20 General Description

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With the proliferation of LAN-based applications, carriers and service providers are seeking to meet the demand for more bandwidth, security, and Service Level Agreements (SLAs). It is estimated that some two million Ethernet ports in metro networks will be deployed by the year 2007. Solutions for these networks must therefore handle a great variety of service offerings (IP, ATM, Ethernet, among others), provide protection mechanisms and Quality of Service (QoS), and be flexible enough to cope with the constant changes that are taking place in this environment.

Both enterprise users and mobile operators rely heavily on TDM trunks to carry most of their traffic. SDH and DWDM are widely accepted as the most suitable technologies for reliable high-capacity transmission. Thus, transmission systems that support multiservice access, namely TDM and Ethernet, are ideal for these needs.

As bandwidth-hungry data applications continue to increase, the metro network requires equipment that is flexible, scalable, transparent, and which can provide flexible allocation of network bandwidth.

BG-20 General Description Introduction


BroadGate™ BG-20 - Miniature MSPP for Metro-Access Networks

Today's cellular and access networks demand add-on service capabilities for a vast array of systems, such as 2G, 2.5G, and 3G base station traffic, SDH optical rings, chains, point-to-point connections, and radio links. At the same time, operators and service providers are expected to provide broadband services to their enterprise customers over the same infrastructure while reducing power consumption, space requirements, and overall cost. In addition, when constructing their private networks, power, military, communications, and government institutions hope that a single network will be able to provide high-efficiency access and transmission of all services while considerably reducing building and maintenance costs. ECI Telecom's BG-20 miniature MultiService Provisioning Platform (MSPP) is the answer to all of these requirements - and more.

Figure 1-1: BroadGate™ BG-20

MSPPs have begun to play a critical role in the journey from legacy to next-generation networks. The BG-20 enables carriers to leverage their SDH installed base while offering an increasing mix of services to their customers. Moreover, thanks to its powerful networking and protection capability and high scalability, it can improve the cost-effectiveness of the metro-access layer and private networks that integrate service access and transmission functions. It can also give timely responses to network evolution requirements.

Introduction BG-20 General Description


Features and Benefits ECI Telecom's BG-20 delivers a cost-effective and affordable mix of Ethernet, SDH, PDH, and PCM services that result in new revenue-generating opportunities. It offers a wide variety of features and benefits, including:

Gradual capacity expansion based on service provisioning needs. More STM-1 interfaces can be added and STM-1s can be upgraded to STM-4s very conveniently. This highly adaptable and flexible architecture translates into significant savings in both operational and capital expenditure (OPEX and CAPEX).

Sublambda grooming for high utilization of existing fiber and top efficiency in transmission of different types of services.

PCM service interfaces and 1/0 digital cross-connect functions to facilitate the construction and maintenance of various private networks.

Multi-ADM and cross-connect functionality, ideal for deployment in flexible network topologies like ring, mesh, and star.

Compactness and resiliency, perfectly suited for both indoor and outdoor enclosures, and for harsh environmental conditions.


In This Chapter Overview .................................................................................... 2-1 Data Applications ....................................................................... 2-1 Metro-Access Applications ........................................................ 2-3 Cellular Applications.................................................................. 2-4 Private Network Applications .................................................... 2-5

Overview BroadGate BG-20 is a flexible MSPP that can be deployed in various applications. Its powerful networking and protection capabilities, and high expandability, combined with its small footprint and economical cost, make it ideal for metro-access and cellular networks. The BG-20 boosts service provisioning, aggregation, and transport, making it an essential element in today's networks.

Data Applications Ethernet services have been the driving force in the telecommunications industry in recent years, providing a new approach to data service provisioning and connectivity. This has brought about exceptional growth in the demand for more bandwidth at reduced cost.

2 2 Applications

Applications BG-20 General Description


The BG-20's Layer 1 and Layer 2 Ethernet capabilities offer carriers a clear migration path from pure TDM-based legacy services to new value-added data services. With the BG-20, carriers can now provide services such as Ethernet Private Lines (EPL), replacing traditional TDM leased line services, Ethernet Virtual Private Lines (EVPL) using shared bandwidth, and Ethernet Private LAN/Ethernet Virtual Private LAN (EVPLAN), extending corporate LANs over the WAN. All services can be offered with QoS and SLA assurances, controlled and managed by ECI Telecom Optical Networks Division's multidimensional LightSoft® Network Management System (NMS).

Figure 2-1: Typical Ethernet application

BG-20 General Description Applications


Figure 2-2: IP DSLAM aggregation application

The BG-20 polices and queues traffic to ensure QoS, and manages bandwidth resources at the packet level. As many customers insist on fully guaranteed QoS, it facilitates the provision of a range of QoS levels for different customers, as well as several service levels for the same customer, if required.

Metro-Access Applications Metro-access networks are characterized by an increasing demand from residential and business customers for higher bandwidth to support voice, data, and video services.



Although the BG-20 is very small, it offers scalable STM-1/4 aggregation of access traffic in multiring and point-to-point topologies. The platform adds/drops PDH, SDH, and Fast Ethernet services at local POPs.

Figure 2-3: BG-20 in a metro-access application

Cellular Applications As the cellular market continues to boom, it is essential for operators to deal with constant increases in traffic, changes in connectivity demands affecting network topologies, and migration to new technologies (GSM to GPRS to 3G). All of these changes require scalable and flexible optical infrastructure expansions down to the Remote Access Network (RAN).

The BG-20 is very suitable for building RAN transmission networks:

It is compact and resilient, making it perfectly suited for both indoor and outdoor enclosures and harsh environmental conditions

It consolidates data traffic with TDM traffic for a shared infrastructure

It supports point-to-point, ring, and mesh topologies, and can easily be upgraded from STM-1 to STM-4

It is highly flexible and low cost, improving the network's cost-effectiveness

BG-20 General Description Applications


It efficiently handles advanced data services (WLAN and IP migration) provided by cellular operators

Figure 2-4: BG-20 in a cellular application

Private Network Applications In general, power, military, communications, and government institutions tend to build their own private communication networks. This is due to network security considerations or the fact that the services provided by current telecom carriers cannot satisfy their requirements. To reduce infrastructure and maintenance costs, private network users expect a single network to meet all their communication service access and transmission requirements.



Many types of services and interfaces are supported. While the quantity of service interfaces needed by most sites is generally low, the requirements for network reliability are very demanding.

Figure 2-5: BG-20 in a private network application

The BG-20 is designed to meet today's growing network needs, such as the cost-reduction requirements of metropolitan and cellular applications. Optimized to meet the demands of today and tomorrow, the BG-20 is the key building block for achieving highly competitive solutions, so enabling operators to cater to unpredictable growth while avoiding the need to restructure their network.


In This Chapter Overview .................................................................................... 3-1 TDM Configuration Options ...................................................... 3-2 Data Services .............................................................................. 3-3 Traffic I/O Interfaces .................................................................. 3-5

Overview As a powerful MSPP for access networks, the BroadGate BG-20 can deliver a variety of services. Designed for installation in Customer Premises Equipment/Customer Located Equipment (CPE/CLE), Central Offices (COs), and street-side and basement cabinets, the BG-20 integrates Ethernet with SDH and PDH capabilities into a 1RU-high (44 mm) unit.

The BG-20 eliminates the boundaries between data and voice communication environments, and paves the way for service provisioning without sacrificing equipment reliability, robustness, and QoS. Thus, both operators and service providers benefit from the best of both worlds: the cost-effectiveness and universality of Ethernet and QoS, and the scalability and survivability of SDH.

Used in many subnetwork topologies, the BG-20 can handle a mixture of point-to-point, hubbed, and meshed traffic patterns. This combined functionality means operators benefit from improved network efficiency and significant savings in terms of cost and footprint. The BG-20:

Increases the number of STM-1 interfaces, or upgrades from STM-1 to STM-4 easily and smoothly

Aggregates traffic arriving over Ethernet, E1, E3, DS-3, and STM-1 directly over STM-1/4

3 3 System Architecture

System Architecture BG-20 General Description


Can be configured as a Terminal Multiplexer (TM) with a single port for line aggregates, as an ADM with two aggregate ports, or as a multi-ADM and cross-connect

Is suitable for indoor or outdoor installations

Supports an extended operating temperature range up to 55 °C

TDM Configuration Options The BG-20 has 16 VC-4 x 16 VC-4 high/low order full cross-connect matrixes that support service aggregation from 2048 kbps to 622 Mbps, and flexible cross-connect at each level, such as VC-12, VC-3, and VC-4. This translates into unique advantages in service distribution and network expansion. In addition, users can adopt initial network solutions at minimal cost and upgrade their networks according to service development.

The BG-20 supports mesh, ring, star, and linear topologies. All system configurations are controlled by a single network management system with end-to-end service provisioning. It can be configured to operate as a single ADM/TM and as a multi-ADM/TM.

Single ADM/TM Mode

In the ADM/TM mode, the BG-20 provides classic SDH multiplexing functionality. It operates at the STM-1 and STM-4 line bitrates.

To operate the unit as a TM, a single aggregate is required. To operate it as an ADM, two aggregates are used. In all modes, the BG-20 matrix provides full nonblocking connectivity, allowing high flexibility to traffic changes, efficient aggregation and network utilization, and simplified network operation.

Although powerful in its initial configuration, a simple BG-20 ADM/TM is future-proof, with a variety of expansion options:

When traffic demand grows, the ADM or TM can be upgraded from STM-1 to STM-4 on the same shelf

When new rings need to be deployed, the same element can be upgraded to a multi-ADM, closing several rings

When new bandwidth-hungry and data-oriented services are added, the simple addition of extension units supporting additional cards and bandwidth is available

BG-20 General Description System Architecture


Multi-ADM and Multi-TM Modes

A multi-ADM approach assures more granular and scalable bandwidth at much lower cost than traditional TDM services. The ability to deliver this over an existing SDH network means carriers can minimize their investment in new infrastructure as they deliver carrier-class reliability, scalability, and manageability. The multi-ADM configuration is ideal for hub sites that close several rings.

When configured as a multi-TM, the BG-20 replaces several TMs, terminating the SDH line and delivering lower-rate services to end-users. This configuration is suitable for multipoint hubbing applications.

Figure 3-1: BG-20 as a multi-ADM/TM

Data Services Technology infrastructures capable of handling data traffic often require rebuilding or replacement to deal with today's data volumes. This can be expensive and time-consuming. Therefore, telecom operators require a highly available and scalable broadband infrastructure to deliver increasing amounts of data to their customers seamlessly and transparently.

The BG-20 consolidates the Ethernet and transport layers over SDH. It accomplishes this without sacrificing equipment reliability and robustness, or operators' QoS demands.

In addition, it can provide Ethernet services with varying functions and costs by selecting a mode that provides an optimal network price:performance ratio in actual network applications. All these solutions support the latest standards, such as VCAT, GFP, and LCAS, and interoperability with MSPP equipment from other manufacturers.

The BG-20 can be ordered with 6 low-cost Ethernet services supporting either Ethernet transport services (Layer 1) or switched Ethernet services (Layer 2). Utilizing Layer 1 Ethernet capabilities, the BG-20 supports high-performance EPL services at minimum cost.



When utilized in its Layer 2 configuration, the BG-20 supports a variety of switched Ethernet service types such as EPL, EVPL, EPLAN, and EVPLAN. QoS is guaranteed for all these services. VLAN stacking (Q-in-Q) and Multispanning Tree Protocol (MSTP) functions are also supported.

Benefits and Features

When delivering data services, the BG-20 provides the following benefits:

Enhanced CAPEX savings (less equipment) and bandwidth utilization

Reduced OPEX due to the cost-effective integration of Ethernet with SDH in one platform with a single management system

Multiple Ethernet services provided on one physical port, including:

LAN to LAN, pure point-to-point and multipoint connectivity

Bandwidth granularity and shared or dedicated bandwidth

Statistical multiplexing and ISP connectivity

Layer 2 data application features:

Multipoint-to-multipoint transparent LAN services

Shared capacity for multiple users, ensuring cost-effective statistical multiplexing

Ethernet over SDH advantages:

Ethernet with carrier-class reliability, operation, and management

A wide variety of protection schemes

Ethernet traffic carried over existing SDH infrastructures, exploiting resources, footprint, and operational efforts

Low-cost EPL services provided in a node at the edge of a network

MAN Ethernet solutions with powerful functions

BG-20 General Description System Architecture


Traffic I/O Interfaces The capability to support and aggregate a wide range of services over a variety of technologies and media enables operators to deploy the BG-20 in different infrastructures. This provides a smooth integration with existing and future networks. The BG-20 supports a wide range of I/O interfaces and Layer 2 Ethernet services, enabling its deployment in transmission networks, as follows:

SDH: electrical STM-1 interface; optical STM-1 and STM-4 interfaces

PDH: E1, E3, and DS-3

Data: 10/100BaseT and 1000BaseSX/LX (future version)

All electrical and optical I/O interfaces are fully compatible with applicable ITU-T and ETSI standards.

The BG-20 enables flexible I/O assignment. Any combination of daughterboards and extension cards is allowed, provided the total matrix capacity is not exceeded.

Table 3-1: BG-20 interfaces capacity

Traffic type Max. ports per shelf

2 Mbps 21 (built-in)

34 Mbps 3

45 Mbps 3 STM-1e 6 STM-1o 6 STM-4 3 10/100BaseT - Layer 1 6




In This Chapter Overview .................................................................................... 4-1 Common Process Functions ....................................................... 4-2

Overview The BG-20 processes voice and Ethernet data services over SDH. Its modular architecture enables network operators to start small and then simply and cost-effectively expand their systems as demands increase.

This chapter describes the following BG-20 components and functions:

Common process functions, including:

Control and communication

Timing and synchronization

Traffic and cross-connect

Overhead processing

I/O and traffic components, including:

SDH interfaces

PDH interfaces

Ethernet interfaces and switching

Power feed

4 4 System Design

System Design BG-20 General Description


Common Process Functions The Main Control and Cross-Connect (MXC20) card performs all BG-20 control and communication, timing, service cross-connect, and overhead processing functions:

Control and communication - the communication module supports six full Digital Communication Channels (RS+MS DCCs) and Embedded Overhead Channels (EOCs, DCC over VC-12). The unit can send network management information through third-party SDH or PDH networks via timeslots in the E1 channel. It supports transparent packet conversion from the network interface/DCC channel to the serial port. A large capacity Flash stores equipment configuration data and software versions (up to two). Both online and remote software upgrades are supported.

Timing - in compliance with applicable ITU-T recommendations for functionality and performance. This module supports six T1 external references, five T2 external references, and two T3 external references (2.048 Mbps and 2.048 MHz). It also supports two T4 output functions (2.048 Mbps and 2.048 MHz).

Cross-connect matrix - the MXC20 supports nonblocking 16 VC-4 x 16 VC-4 high/low order cross-connects and implements hardware-based subnet connection protection on all interfaces. Switch to protection time is lower than 50 ms. The matrix is fed by a matrix of 32x32 VC-4 switch allowing for dynamic usage of the HO/LO cross-connect matrix.

Overhead processing module - this module provides flexible cross-connects for all STM-n interface section overhead bytes at the 64 kbps level. It supports transmission of RS-DCC, E1, F1, and E2 signals carried in multiple section DCC bytes. Furthermore, it provides one V.11 and one V.24 overhead interface, and one orderwire interface. The orderwire interface connects to an external box which supports the telephone device and point-to-point communication or conference calls in any network topology.

The MXC20 supports onboard Layer 1 or Layer 2 Ethernet interfaces and services. It also accommodates one service traffic slot for flexible configuration of virtually any type of PDH, SDH, or Ethernet interfaces. This integrated flexible design ensures a very compact equipment structure and reduces costs, making the BG-20 an ideal MSPP for the access layer.

All MXC20 functional modules provide powerful processing capabilities and fully comply with applicable standards.

BG-20 General Description System Design


Control and Communication

The BG-20 control and communication functions include:

Internal control and processing

Communication with external equipment and management

Network Element (NE) software and configuration backup

Internal control and processing

The MXC20 provides central control, alarm, maintenance, and communication functions for BG-20 network elements. If required, it can also communicate with control processors of cards in the BG-20E, an extension unit for various service cards, using a master-slave control hierarchy.

Communication with external equipment and management

The MXC20 is also responsible for communicating with other network elements and management stations.

The MXC20 communicates with the remote EMS-BG-40/LCT-BG-40 and other SDH NEs via the DCC or EOC (3 x 64 kbps in E1) channel. It communicates with the local EMS-BG-40 and LCT-BG-40 via the Ethernet interface. The communication between SDH NEs, or between SDH NEs and the EMS, can also be via the DCN. The MXC20 can connect to the DCN via Ethernet or V.11.

In addition, the MXC20 can connect to external equipment via Ethernet or RS-232, using DCC channels of the SDH network to build a narrow bandwidth DCN for the external equipment.

Software and configuration backup

The MXC20 contains a large-capacity onboard Nonvolatile Memory (NVM) that stores a complete backup of both the system's software and node configuration. This ensures superior management and control availability.

The MXC20 enables easy software upgrade using a remote software procedure operated from the EMS-BG-40 management station or LCT-BG-40 craft terminal. The card can store two different software versions at the same time, and enables a quick switchover between the different versions when required.



Timing and Synchronization

The MXC20 provides high-quality system timing and synchronization to all traffic modules and functions in compliance with applicable ITU-T recommendations. The BG-20 also provides T4 capability and supports the Synchronization Status Market (SSM) in full compliance with applicable ITU-T recommendations. In addition, its clock performance exceeds that required in the standards.

To support reliable timing, the BG-20 provides multiple synchronization reference options. Up to 18 of the following timing references can be monitored simultaneously:

Recovered clocks from up to six STM-n interfaces (T1)

Recovered clocks from two E1s in the MXC20B and six from the BG-20E extension unit (T2)

One configurable 2 MHz and 2 Mbps external timing source (T3)

Local internal clock

Holdover mode

Any timing signal can be selected as a reference source. The timing and synchronization unit in the MXC20 provides direct control over the source selection (received from the system software) and the frequency control loop. The definition of the synchronization source depends on the source quality and synchronization mode of the network timing topology (set by the EMS-BG-40 or LCT-BG-40).

Synchronization references are classified at any given time according to a predefined priority and prevailing signal quality. The BG-20 synchronization subsystem synchronizes to the best available timing source using the SSM protocol. In the MXC20, an Oven Controlled Crystal Oscillator (OCXO) is frequency-locked to this source, providing internal system and SDH line transmission timing. The shelf is synchronized to this central timing source.

The BG-20 provides an output for synchronization of external equipment within the exchange. The synchronization output is 2 MHz and 2 Mbps (software configurable). This output can be used to synchronize any peripheral equipment or switch.

The operator can remotely manage network synchronization using the EMS-BG-40, and can select and determine the priority of each BG-20 timing source reference. These sources can include any external reference clock, PDH line signal, SDH line signal, or internal clock. In addition, LightSoft® can be used to define overall network synchronization, network synchronization maps, and alternative synchronization maps for different contingency events.



The BG-20 supplies a 0.1 ppm stable holdover mode when all alternative synchronization sources are temporarily unavailable. The platform's default clock accuracy complies with applicable ITU-T and Telcordia standards at the network level. Optional synchronization quality can be provided using additional external units.

Figure 4-1: Timing distribution block diagram

Traffic and Cross-Connect Functionality

The heart of the BG-20 is a nonblocking 4/3/1 high/low-order cross-connect matrix located in the MXC20. It supports 16 VC-4 nonblocking high/low order cross-connects (4/3/1). The main functions of the MXC20 matrix are:

High- and low-order SDH 4/3/1 nonblocking cross-connects.

Protection termination. Subnet Connection Protection (SNCP) switching is executed in the matrix. The SNCP implementation is hardware-based, thus the system can support capacity-unrestricted subnet connection protection with a switch to protection time lower than 10 ms.

Overhead Processing

The overhead processing unit is located in the MXC20, whose core is a full DS0 cross-connect matrix. This matrix connects the section overhead bytes of all STM-n interfaces, the DCC processing module in the control and communication unit, the orderwire interface and processing module (located in the optional OW-20 unit), the overhead interface module, one channel of a framed E1 signal, and another channel which can be selected as framed or unframed E1 (used to provide clear channels) so that all overhead bytes can be flexibly cross-connected.



The DS0 cross-connect matrix enables the BG-20 to support numerous functions, such as flexible cross-connect of section overhead bytes, transparent DCC transmission, and extension of the regeneration section DCC bytes and E1/E2/F1 bytes through the E1 or multiplex section DCC bytes. The BG-20 ensures smooth transmission of network management and orderwire information in an environment with SDH networks from different manufacturers.

The overhead processing unit provides one V.24 interface, one V.11 (DCE mode) overhead interface, and one orderwire interface which connects to an external OW-20 unit.

The OW_4X daughterboard provides the orderwire telephone function. It supports the point-to-point and conference call functions under any network topology, as well as the Dual Tone Multi-Frequency (DTMF) call function.

SDH Interface Unit

The BG-20 supports two onboard SDH interfaces, each supporting optical STM-1,STM-4, or electrical STM-1 SFPs. A traffic-extractable card installed in the BG-20B traffic slot can add other SDH interfaces. The following SDH traffic is supported:

SMQ1: provides four SFP-based STM-1 interfaces, optical ones like S1.1, L1.1, L1.2, or electrical STM-1

SMD1: provides two SFP-based STM-1 interfaces, optical ones like S1.1, L1.1, L1.2, or electrical STM-1

OMS4B: provides one STM-4 optical interface (such as S4.1, L4.1, and L4.2)

PDH Interface Unit

The BG-20 supports various PDH interfaces, such as E1, E3, and DS-3. By flexibly configuring various PDH interface cards in its extension slots, the unit provides different types and quantities of interfaces, including:

Built-in E1 interfaces: provides 21 E1 interfaces and supports output retiming (optional between 75 Ω and 120 Ω)

M345_3 card: an extractable module installed in the traffic card of the MXC20 providing three E3 and DS-3 interfaces, each of which can be independently set as E3 or DS-3 via the software



When used at the network edge, the BG-20 needs only a small number of E1 interfaces. In this case, the interfaces can be provided directly through the built-in E1 interface unit of the MXC20. Additional E1 interfaces can be provided by E1 cards in the BG-20E extension unit.

Ethernet Interface and Switching Unit

Two configuration modes enable the BG-20 to provide Ethernet service interfaces directly from the MXC20:

BG-20B-L1: A BG-20 unit supporting six Fast Ethernet LAN interfaces with Layer 1 functionality. Each LAN interface is connected to an EOS internal interface supporting VCAT/GFP/LCAS standards at VC-12 or VC-3 granularity. The total supported capacity of the six L1 services is 622 Mbps (252 x VC-12).

BG-20B-L2: A BG-20 unit supporting six Fast Ethernet LAN interfaces with Layer 2 functionality. The Layer 2 functions include ingress policing, standard double tagging, MAC learning and switching, and so on. The Layer 2 switch is connected to the SDH aggregates through eight EOS interfaces with total capacity of 622 Mbps. Each EOS can support up to 100 Mbps.

BG-20B-L1 is ideal for EPL services. The bandwidth of each Ethernet service channel can be flexibly set to VC-12 granularity. It can also be adjusted and protected via LCAS.

The BG-20B-L2, with its Layer 2 switch and multiple EOS links, is ideal for EVPL, EPLAN, and EVPLAN services, as well as aggregation unit in Point-to-Multipoint solutions.

Figure 4-2: Ethernet functionality



Power Feed

The BG-20 power feed can be from a +48 V DC to -60 V DC or 220 V AC source. The INF-20 is a power filter function for DC power feed, and the AC_CONV-20 is an AC/DC conversion unit for AC power feed. The INF-20 supports dual power feeding. Both INF-20 and AC_CONV-20 modules are field-extractable.

The BG-20 adopts distributed power feeding. The MXC20 and the module in the traffic slot generate their own local voltage using high-quality DC to DC converters. This distributed power concept ensures efficient heat distribution as well as maximum reliability of the power feed interface.


In This Chapter Overview .................................................................................... 5-1 SDH Path/Circuit Protection Schemes ....................................... 5-1 Ethernet Service Protection ........................................................ 5-3 Summary of Protection Schemes................................................ 5-4

Overview In today's mission-critical broadband networks, a cut fiber optic cable means upheaval. The fiber is essentially the lifeline to the network. Data loss due to cable failure, node failure, port failure, disastrous switch failure, and even equipment failure, results in millions of dollars of lost revenue, as well as some very frustrated users.

The BroadGate BG-20 supports various high-reliability traffic protection mechanisms, including SDH Path/Circuit Protection Schemes, LCAS-based protection, and Spanning Tree Protocol (STP) protection for Ethernet traffic.

SDH Path/Circuit Protection Schemes The BG-20 features path and circuit protection over ring and mesh topologies, as follows:

Dual route path protection

SNCP - enhanced Dual route path protection over mesh topologies

5 5 Protection

Protection BG-20 General Description


Dual Route Path Protection

The BG-20 supports highly efficient advanced rings over meshes that provide inherent protection in the event of a traffic-affecting circuitry or link failure. In this mode, the protection paradigm is a self-healing path-protection scheme.

Any level VC (VC-4, VC-3, VC-12) trail protection may be selected from any two STM-n interfaces. Since the BG-20 functions as a multi-ADM and DXC in mesh environments, any interface, port, and/or card can be selected as working or protection. This flexibility enables the BG-20 to integrate with other network nodes and provides end-to-end network path protection regardless of network topology. This integrated path protection capability enables operators to smoothly integrate the BG-20 into existing networks.

The path protection switching operates automatically via the cross-connect matrix in the MXC20, and does not require operator intervention or path recalculation. The result is an exceptionally fast switch to protection lower than 30ms.

Figure 5-1: Path protection switching in a bidirectional self-healing ring

BG-20 General Description Protection


The dual route path protection scheme is topology-independent. It can be used in any complex network topology such as multi-ring or mesh. Protection is performed at service endpoints. This ensures service protection regardless of network topology or intermediate equipment. Route diversity protection ensures seamless protection integration and interoperability of the BG-20 systems with any other SDH equipment.

SNCP

SNCP provides independent trail protection for individual subnetworks connected to the BG-20. Combined with the system's drop-and-continue capability, SNCP is a powerful defense against multifailure conditions in a mesh topology. By integrating SNCP into the BG-20, operators achieve superior traffic availability figures. Therefore, SNCP is extremely important for leased lines or other traffic requiring superior SLA availability.

The BG-20 enables automatic SNCP switching without operator intervention or path redefinition. The result is exceptionally fast protection switching in less than 30 ms, with typical switching taking only a few milliseconds. Protection switching is performed via the cross-connect matrix in the MXC20. The BG-20 supports SNCP at all VC levels (VC-4, VC-3, VC-12).

Ethernet Service Protection Ethernet service is protected at the SDH level, but can also be protected by following two protection mechanisms:

LCAS-based EOS channel protection. When a VC Group (VCG) is used to carry Ethernet services, members of a VCG can be divided into several subgroups, each using a different physical path. Thanks to LCAS and the Ethernet card's powerful differential delay compensation capability, when some paths fail, invalid members can be removed through LCAS while the remaining members continue to transmit services. When the invalid members return to normal, bandwidth can be increased hitlessly. LCAS-based protection supports service transmission via the operation and protection channels simultaneously, thus increasing the bandwidth utilization ratio.

STP-based protection. The FE_L12 card supports STP in compliance with IEEE 802.1d and IEEE 802.1s, which can be used to protect Ethernet services. Spanning Tree Protocol (STP) eliminates loops in the Ethernet network while simultaneously providing shared Ethernet traffic restoration. When multipoint-to-multipoint Ethernet services are provided, STP-based protection yields higher bandwidth efficiency than protection at the SDH level or LCAS-based protection.

Protection BG-20 General Description


Summary of Protection Schemes The following table lists the protection schemes supported by the BG-20 and their main benefits.

Table 5-1: Traffic protection schemes

Protection scheme

Network topology/ configuration Main benefits

Dual route path protection

Mesh, ring, point-to-point

Dedicated performance monitoring-based protection for any VC-12/VC-3/VC-4 and concatenated traffic. Better service reliability.

SNCP (single and dual node interconnections)

Mesh, ring, point-to-point

Better reliability and network resilience as the BG-20 handles multiple failures over mesh.


In This Chapter Layered Architecture .................................................................. 6-2 Client/Server Architecture .......................................................... 6-3 Integration with Other Products ................................................. 6-3 LightSoft Network Manager....................................................... 6-3 EMS-BG-40................................................................................ 6-9 LCT-BG-40 - Advanced Graphical Craft Terminal ................. 6-10

6 6 Management

Management BG-20 General Description


Layered Architecture ECI Telecom's management concept is designed using a layered architecture in accordance with applicable standards. Separate management layers make up the management structure. The lowest level, the Network Element Layer (NEL), constitutes the embedded agent software of the network elements. The second layer, the Element Management Layer (EML), controls many individual network elements, while the third layer, the Network Management Layer (NML), controls the main network management functions.

Figure 6-1: ECI Telecom's layered architecture management concept

In this scheme, LightSoft, ECI Telecom's powerful network management system, functions at the NML, while the EMS-BG-40 functions at the EML. A northbound interface can connect either the EMS-BG-40 or LightSoft to your Operations Support System (OSS).

In addition, the BG-20 features a craft terminal application. LCT-BG-40 Craft terminal applications provide fast easy connectivity and access to installation, configuration, and management functions. For more information refer to LCT-BG-40 - Advanced Graphical Craft Terminal (on page 6-10).

BG-20 General Description Management


Client/Server Architecture LightSoft implements an advanced client/server software architecture that supports a large number of processes. The LightSoft server can be run on either single or multiple workstations. This distributed architecture enables you to divide large complex networks among multiple operators. The multiconfigurator feature of LightSoft gives each operator the means to initiate sessions and manage the network simultaneously, either in whole or in part.

Integration with Other Products The BG-20 has been designed to smoothly integrate with networks that are not based on ECI Telecom's products. This enables you to build real-world multivendor networks that ensure the free flow of management information between SDH and other complimentary access, radio, and switching products.

LightSoft Network Manager LightSoft is a multidimensional network management system managing the complete family of element management systems (EMSs) offered by ECI Telecom. LightSoft enables you to assume full control of all equipment in your network, including:

XDM transport platform

BroadGate™ family of multiservice products for access applications

Entire SYNCOM multiplexer family at the STM-1, STM-4, and STM-16 layers

Other third-party equipment

LightSoft is a unified NMS that provisions, monitors, and controls all network layers, enabling you to manage multiple technology layers (SDH, data, and optical) independently of the physical layer. This offers on-demand service provisioning, pinpoint bandwidth allocation, and dramatic reductions in the equipment and operating costs that multiple management systems often require. It does this by providing all facets of network management, netwide, from a single platform. Management features include configuration, fault detection, performance management, administrative procedures, maintenance operations, and security control. Within one integrated management system, LightSoft enables you to fully control all of your NEs regardless of their manufacturer, and view the complete network at a glance. With LightSoft, multiple operators can simultaneously configure the network while preventing any configuration conflicts.



Management Interfaces

LightSoft supports an open CORBA-based interface both north- and southbound for managing or being managed by third-party applications. The EMS-BG-40 also supports the same interface, northbound. The interface, which supports alarms, configuration, and provisioning, complies with the Multi-Technology Network Management (MTNM) information model being developed by the TeleManagement Forum (TMF), a consortium of all major telecom equipment vendors. EMS-BG-40, which manages both BG-40 and BG-20 equipment, supports a number of conventional interfaces, such as export of current alarms via FTP.

User Interface

Both LightSoft and the EMS-BG-40 user interfaces provide a powerful yet easy-to-use tool for managing your network. A single user-friendly GUI combines configuration, maintenance, and performance management tools with fault handling, end-to-end trail definition, and fail-safe database backups for uninterrupted and reliable network operation.



The LightSoft user interface features an outstanding advance in topology map design - multilayer topology views. These views enable you to display the topology of each technology layer independently of the topology of the physical layer.

Figure 6-2: LightSoft main window

Topology Management

LightSoft enables network administrators commission and configure equipment in local and remote subnetworks across the deployment. Network elements can be deployed in a wide range of topologies, including single or multiple rings with appendages, or chains and composite topologies incorporating terminal multiplexers. Users move intuitively from an overall survey of the network landscape to detailed status and control views of any network element, transmission level, system card, or trail.

This application enables you to manage network elements at multiple levels. It distinguishes between the NEs (or managed elements [MEs]) that make up the network, and the logical elements (LEs) that these MEs represent. An ME designates a piece of equipment, like a shelf, whereas the LE is a technology-oriented representation of the various physical elements in the network. You can customize these elements by splitting them, for example, different icons on the map may represent different ports belonging to a single NE.



This unique distinction enables true multidimensional network management by allowing operators to:

Focus on MEs when creating and deleting NEs (physical layer)

Focus separately on the ports available at each technology level (for example, SDH, optical, or data) when managing trails (technology layer)

Whenever an ME is added to the network at the physical layer of LightSoft, an LE is automatically projected into the relevant technology layer, as shown in the topology view in the interface. If an ME contains ports that belong to multiple technologies, as is the case with BG-20 shelves, LEs are created at each technology layer containing only the ports relevant to that layer. Nested groups are supported and can be defined differently in the various layers.

Trail Configuration

LightSoft provides powerful trail configuration tools. A detailed definition of through and local cross-connects gives administrators precise control of the system structure, guaranteeing uninterrupted services and maximized use of bandwidth. In addition to manual trail routing, the patent-pending path-finding algorithm searches for and selects optimal end-to-end primary and protection paths across complex topologies. Optimization criteria are user-defined and may include such parameters as number of nodes, link cost, distance, shared risk (such as common ducts), and so on. A powerful trail synchronization function polls the entire network, keeping the LightSoft trail database up to date. LightSoft also provides numerous protection and traffic reconfiguration schemes in case of service disruption. The system provides full traffic restoration via contingency traffic plans.

The LightSoft advanced trail management functions allow you to create, delete, and modify SDH trails, and to acquire optical and data services from the network.

SDH trails management

For BG-20 NEs, LightSoft supports both virtual and contiguous concatenation for the transport and cross-connection of VC-4/VC-3 or STS-3c/STS-1 signals. This is used for high-bitrate data services that require transport of payloads exceeding a single VC-4/VC-3 or STS-3c/STS-1 capacity.

Highly sensitive data networks can rely on LightSoft’s link protection capabilities supporting a variety of schemes, including MSP1+1/APS1+1, MS-SPRing, and several advanced bridge protection options.



DWDM trails management

LightSoft enables you to upload, label, and display existing optical trails from the optical layer. This form of "bottom-up" provisioning is suited to optical equipment that does not support tunable lasers, and ensures that the application has all the required trail information that was provisioned at the fiber level.

LightSoft takes advantage of the BG-20 sublambda grooming capabilities for the efficient utilization of DWDM wavelengths. This capability provides a form of "top-down" optical trail provisioning by creating cross-connects between optical endpoints at the SDH level.

Ethernet trails management

LightSoft enables BG-20 NEs to provide data services via its Data I/O (DIO) and Ethernet Interface Switch (EIS) cards for Layer 1 and Layer 2 services. Both cards support bandwidth management allocation for each Gigabit Ethernet connection in VC-4/VC-3 or STS-3c/STS-1 increments, up to the full Gigabit Ethernet rate. Each interface is configured separately to provide maximum flexibility.

Fault Management

LightSoft simplifies realtime status monitoring of the network and its elements. The main window uses color-coded icons to show equipment status at a glance. Customizable alarm listings, alarm counters, and alarm audio indicators, which are updated in real time, are also displayed in the main window. Administrators can acknowledge alarms from the Current Alarms list, post "sticky note"-type messages (User Notes) to other network personnel, and customize their own alarm filters. They can click any element in the diagram to open status windows listing the alarms for each object, including NEs, cards, and physical ports.

The LightSoft fault management system is fully integrated and includes alarms for all managed NEs, regardless of the layer (physical, SDH, data, or optical) on view.

GUI Cut-through

LightSoft uses a process called GUI cut-through that enables you to invoke EMS functions without launching the EMS-BG-40. You can:

Set, change, and propagate NE attributes

Configure shelves and cards



Change alarm severities

Set NE timing sources

Activate performance management functions on NEs

Perform maintenance functions on NEs or their objects

Redundancy and Security

LightSoft and EMS-BG-40 provide a full range of support features to keep your network running smoothly, and protect it from unauthorized and malicious use.

Redundancy

LightSoft provides a fully field-proven redundancy mechanism called Remote Database Replication (RDR) that provides full network management backup capabilities. RDR ensures system continuity by maintaining a comprehensive and complete backup copy of the current network configuration. LightSoft uses duplicate management hardware, with one station serving as the active site (primary server) and the other as the standby site (backup server and mirror). One standby site can act as a backup for multiple stations (1:n) running LightSoft, and various EMSs.

All the databases in the active site (NMS and EMS) are periodically duplicated and transmitted over a direct link to the standby site. To make the backup process efficient, only changes made since the last replication are included.

Should a failure occur in the active site, the operator quickly switches over to the standby site and resumes management of the network within minutes. The EMS-BG-40 database signature feature intelligently updates the standby site with all NE configuration data that has changed since the last replication.

Security functions

LightSoft provides two main types of security functions:

User security

System security



User security controls the persons having access to the system (user groups), which operations these users can perform (capability profiles), and the elements of the network on which these operations can be performed (domains). In LightSoft all users are assigned to user groups, each of which is then paired with a capability profile and a defined number of domains. Users in a particular user group can perform only those functions provided for by their capability profile assigned to the group, and only on those domains assigned to the group.

LightSoft enables you to divide a network into many different VPNs, each one having its own capability profile. This method provides each client with the appropriate level of operational control, without infringing on the security needs of any other client.

Passwords, user action logs, and an optional keyboard lock feature are used to further ensure system security and integrity.

EMS-BG-40 EMS-BG-40 provides full-feature BG-40 and BG-20 support. It functions at the EML in the TMN scheme, and can operate directly under LightSoft. It is designed as an open system in compliance with the CORBA standard. EMS-BG-40 can control scores of BG-20 NEs at a time. It provides a wide range of management functions, including alarms, configuration, inventory, provisioning, and security management.

Figure 6-3: Shelf view as displayed in the EMS-BG-40



LCT-BG-40 - Advanced Graphical Craft Terminal

The LCT-BG-40 is a PC-based BG-40 and BG-20 installation, maintenance, commissioning, and configuration tool for field technicians. The GUI of LCT-BG-40 makes this product extremely easy to use. It provides rapid direct connection to deployed NEs using an Ethernet interface.

The LCT-BG-40 includes all the functionality required by a technician arriving at a site: full installation, NE commissioning (including slot assignment, IP routing, and DCC port configuration), and troubleshooting. It provides the user with a clear view and control of NE internals (cards, objects, status, configuration). Password protection ensures only authorized access from the craft to field-installed equipment.

Figure 6-4: Shelf view as displayed in the LCT-BG-40


In This Chapter Overview .................................................................................... 7-1 Rack Installation ......................................................................... 7-2 MXC20 ....................................................................................... 7-2 Traffic Interface Module ............................................................ 7-3 Power Feed Unit ......................................................................... 7-3

Overview The BG-20 shelf is housed in a 240 mm deep, 465 mm wide, and 44 mm high equipment cage. The shelf consists of the MXC20 card, a power feed module, one traffic daughter slot, and three adaptor slots on the rear.

Figure 7-1: BG-20 front view

The MXC20 houses one traffic daughterboard supporting different types of PDH or SDH interfaces.

Either 220 V AC or 48/60 V DC power feeds can be selected. The 48/60 V DC power feed supports a dual-channel power supply. The fan unit, used to cool the system, is located on the right side of the shelf. The fan control system is on the MXC20.

7 7 Physical Description

Physical Description BG-20 General Description


The following table lists the modules that can be configured in each slot

Table 7-1: List of cards

Name Description MS DS PS

MXC20 Cross-connect, timing control, 21xE1 and 2x STM-1/4 interfaces card

√

OMD1-B 2 × STM-1o/e module √

OMQ1-B 4 × STM-1o/e module √

OMS4-B 1 x STM-4 module √

M345_3-B 3 x DS-3/E3 module √

Ethernet L1* 6 x FE interfaces √

Ethernet L1** 6 x FE interfaces √

INF_20-DC Power filter unit (-48 V DC) √

AC_CONV-20 Power conversion unit (220 V AC) √

* Requires ordering BG-20B-L1 type of unit

** Requires ordering BG-20B-L2 type of unit

Rack Installation The BG-20 can be installed in 2,200 mm or 2,600 mm ETSI racks or in 19” or 23” racks.

MXC20 The MXC20 card is the main card of the BG-20. It integrates functions such as control and communication, cross connect, synchronization timing, overhead processing, and mapping of SDH and Ethernet interfaces. The front panel of the MXC20 has the following interfaces, indicators, and buttons:

Network management interface (10BaseT, RJ-45)

NE status indicator (Active), NE alarm severity indicator (Major, Minor), and network management interface status indicator (Link)

System reset button (Reset)

21 E1 interfaces (SCSI50)

BG-20 General Description Physical Description


One V.24 overhead interface (RJ-45)

One V.11 interface (DB-15)

One RS-232 interface (RJ-45)

One orderwire unit connection interface (RJ-45)

Alarm input/output interfaces (DB-15)

External clock interfaces (RJ-45)

Traffic Interface Module The MXC20 has one traffic daughterboard that can be configured to provide the following traffic cards:

OMD1-B - Dual port STM-1 module. The module can support optical or electrical STM-1 interfaces by installing the appropriate SFPs. Optical SFPs support LC connectors, while electrical SFPs support DIN connectors.

OMQ1-B - Quad STM-1 module with the same capabilities as OMD1-B.

OMS4-B - Single port STM-4 supporting SFP modules.

M345_3-B - Triple DS-3/E3 module. Each interface can be separately configured to E3 or DS-3, and connectivity is through unbalanced DIN connectors.

Power Feed Unit BG-20 has one slot that is used for configuring the power input module. Two types can be configured: INF_20-DC and AC_CONV-20.

INF_20-DC, used in -48 V/-60 V DC power feed, provides two D-type connectors for external power line connection, and supports dual power feed.

AC_CONV-20 is used in 220 V AC power feed to implement AC/DC conversion. It supports external power line connection through a special power connector.

Physical Description BG-20 General Description



In This Chapter Cross-Connect Specifications..................................................... 8-1 Traffic Protection........................................................................ 8-2 Redundancy ................................................................................ 8-2 Synchronization .......................................................................... 8-2 Jitter and Wander........................................................................ 8-2 I/O Interfaces .............................................................................. 8-2 Management ............................................................................... 8-4 SDH Interfaces ........................................................................... 8-4 Ethernet Specifications ............................................................... 8-6 Physical Specifications ............................................................... 8-7

Cross-Connect Specifications

Cross-Connect Levels Cross-connect levels....................................................................................VC-4,VC-3, VC-12

Cross-Connect Capacity Cross-connect Capacity..............................16 x STM-1 with cross-connect capability of 4/3/1

8 8 Specifications

Specifications BG-20 General Description


Traffic Protection Applicable specifications .......................................................................... ITU-T G.841, G.842

SNCP I/N HO.........................................................................................................within 30 ms

SNCP I/N LO .........................................................................................................within 10 ms

UPSR......................................................................................................................within 10 ms

Redundancy Power system .........................................................................................................Dual feeding

Synchronization There are four timing references available from SDH/PDH multiple timing sources:

From any 2 Mbps PDH tributary interface

From any SDH line

External 2 MHz/2 Mbps configurable timing inputs (1 per shelf)

G.813 internal clock

Synchronization Status Marker (SSM) support is provided.

Jitter and Wander Applicable specifications .......................................................................... ITU-T G.823, G.825

I/O Interfaces

2 Mbps (E1) Physical level .............................................................................................. G.703, Paragraph 6

Frame options............................................................................................................. Unframed

Line code..........................................................................................................................HDB3

Line impedance ................................................................................................ 120 W balanced

BG-20 General Description Specifications


34 Mbps (E3) Physical level .............................................................................................. G.703, Paragraph 8

Frame ............................................................................................................................... G.751

Line code..........................................................................................................................HDB3

Line impedance .............................................................................................. 75 W unbalanced

45 Mbps (DS-3) Physical level .............................................................................................. G.703, Paragraph 5

Frame ................................................................................................. Unframed, ANSI T1.107

Line code........................................................................................................................... B3ZS

Line impedance .............................................................................................. 75 W unbalanced

STM-1 Electrical Physical level ............................................................................................ G.703, Paragraph 12

Bitrate..................................................................................................... 155.52 Mbps ±20 ppm

Frame ............................................................................................................................... G.707

Line code.............................................................................................................................CMI

STM-1 Optical Physical level ..................................................................................................... G.957, Table 2

Wavelength .................................................................................................. 1310 nm, 1550 nm

Bitrate.................................................................................................... 155.52 Mbps ±4.6 ppm

Transmission range ................................................................................................... S3, L3, L5

STM-4 Optical Physical level ..................................................................................................... G.957, Table 3

Wavelength .................................................................................................. 1310 nm, 1550 nm

Bitrate......................................................................................................... 622 Mbps ±4.6 ppm

Transmission range ................................................................................................... S3, L3, L5



Management Applicable specifications .........................................................G.784, G.774, M.3010, M.3100

LightSoft (ECI Telecom Optical Networks Division's Network Manager) server and client for managing all ECI Telecom equipment ........................................... on SUN workstation(s)

EMS-BG-40 (element manager) ..................................................................................... on PC

LCT-BG-40 local craft terminal....................................................................................... on PC

Management and Alarm Interfaces

SNMP and CMIP over TCP/IP to EMS-BG-40; MTNM from EMS-BG-40 to LightSoft or other TMN; 10BaseT to LCT-BG-40; OverHead Access (OHA); Orderwire; Rack Alarm Panel.

Alarms and Performance Performance concept.............................................................................................G.821, G.826

Alarm concept .................................................................................................................. G.783

Alarm types ......................................................... LED indicators, dry contacts, audible alarms

.................................................................. (per subrack), external alarm inputs and outputs

Alarm classes ......................................................................... Critical, Major, Minor, Warning

SDH Interfaces

STM-1 (155.52 Mbps ±4.6 ppm) Application Code1 S-1.1 L-1.1 L-1.2

Operating wavelength (nm) 1261-1360 1263-1360 1480-1580 TRANSMITTER Source type MLM SLM SLM Max. RMS width (nm) 7.7 - - Min. side mode suppression ratio (dB) - 30 30 Min. mean launched power (dBm) -15 -5 -5 Max. mean launched power (dBm) -8 0 0

1 Application code is in reference to ITU-T Recommendation G.691.



Application Code1 S-1.1 L-1.1 L-1.2

Min. extinction ratio (dB) 8.2 10 10 RECEIVER Min. sensitivity (BER of 1*10-12) EOL (dBm) -28 -34 -34 Min. overload (dBm) -8 -10 -10 Max. receiver reflectance (dB) - - -25 OPTICAL PATH BETWEEN S & R Max. dispersion [ps/nm] 96 - - Min. optical return loss of cable (dB) - - -20 Max. discrete reflectance (dB) - - -25 Max. optical path penalty (dB) 1 1 1

STM-4 (622 Mbps ±4.6 ppm) Application Code2 S-4.1 L-4.1 L-4.2

Operating wavelength (nm) 1293-1334/ 1274-1356

1280-1335 1480-1580

TRANSMITTER Source type MLM SLM SLM Max. RMS width (nm) 4/2.5 - -

Max. -20 dB width (nm) - 1 <1 Min. side mode suppression ratio (dB) - 30 30 Min. mean launched power (dBm) -15 -3 -3 Max. mean launched power (dBm) -8 +2 +2 Min. extinction ratio (dB) 8.2 10 10 RECEIVER Min. sensitivity (BER of 1*10-12) EOL (dBm) -28 -28 -28 Min. overload (dBm) -8 -8 -8 Max. receiver reflectance (dB) - -14 -27 OPTICAL PATH BETWEEN S & R Max. dispersion [ps/nm] 46/74 - - Min. optical return loss of cable (dB) - 20 24 Max. discrete reflectance (dB) - -25 -27 Max. optical path penalty (dB) 1 1 1

2 Application code is in reference to ITU-T Recommendation G.691.



Ethernet Specifications

BG-20B-L2

Layer 1 part

Interface type...............................................................................................10BaseT/100BaseT

Number of interfaces................................................................................................................ 8

Encapsulate protocol .......................................................................................................... GFP

Supported concatenation mode ................... VC-12-XC/v (X=1, 2..63), VC-3-XC/v (X=1,2,3)

Total backplane interface bandwidth ...........................................................................1 x VC-4

Minimum frame length supported................................................................................ 64 Bytes

Maximum frame length supported .................................... configurable, maximum 9600 Bytes

Additional transport service support ..................................... LCAS, autosensing; auto-MDIX;

........................................................flow control (duplex mode) based on a PAUSE frame;

.................................................... flow control (semiduplex mode) based on back pressure;

................................................................. abnormal frame filtering; performance statistics;

.............................................................. Ethernet port transmit and receive frames counter;

................................................. multipath transport (maximum allowed different path time

.........................................................................................................................delay: 64 ms)

Layer 2 part

Interface type...............................................................................................10BaseT/100BaseT


Switch capacity .............................................................................................................16 Gpbs

MAC address table capacity............................................................................................... 8192


Maximum frame length supported ........................................................................... 9600 Bytes

Supported VLAN quantity .................................................................4096 as per IEEE 802.3Q

Additional Layer 2 Ethernet switching support ................................. abnormal frame filtering;

........................................................................................ port autonegotiation; auto-MDIX;

.................................................................................................. flow control (duplex mode)



.......................................................................... based on a PAUSE frame and flow control

.........................................................................(semiduplex mode) based on back pressure;

......................................................... GARP; GVRP; STP; MAC address dynamic learning

................................................and aging (configurable aging time); static configuration of

................................................MAC addresses; performance statistics; CoS based on port,

................................................... TAG and TOS, each output interface having two queues;

..................................................................................... strict priority and weighted priority.

BG-20B-L1 Interface type...............................................................................................10BaseT/100BaseT


Encapsulate protocol ........................................................................................................... GFP

Supported concatenation mode ................... VC-12-XC/v (X=1, 2..63), VC-3-XC/v (X=1,2,3)

Total backplane interface bandwidth .......................................................................... 4 × VC-4


Maximum frame length supported .................................... configurable, maximum 9600 Bytes

Additional transport service support ..................................... LCAS, autosensing; auto-MDIX;

........................................................flow control (duplex mode) based on a PAUSE frame;

.................................................... flow control (semiduplex mode) based on back pressure;

...................................................abnormal frame filtering; performance statistics; Ethernet

............................................................ port transmit and receive frames counter; multipath

................................................................. transport (maximum allowed different path time

.........................................................................................................................delay: 64 ms)

Physical Specifications

Dimensions (H x W x D) MXC20............................................................................................44 mm x 465 mm x 24 mm

Traffic Daughter module ...............................................................44 mm x 80 mm x 190 mm

INF_20-DC/AC_CONV-20 ............................................................44 mm x 44 mm x 210 mm

BG-20..............................................................................................44 mm x 465 mm x 24 mm

Racks................................................................................2200/2600 mm x 600 mm x 600 mm



Weight BG-20 fully populated......................................................................................................... 5 kg

Power Applicable specification................................................................................... ETSI 300 132-2

Input voltage .........................................................................................-40 V DC to -72 V DC

Nominal power source ..........................................................................-48 V DC or -60 V DC

Power consumption ......................................................................................... Maximum 70 W

Environmental Conditions

Operation

Applicable specification.................................................................. ETS 300 019-1-3 Class 3.2

Temperature range ..............................................................................................-5 oC to +55 oC

Relative humidity ..................................................................................................... 5% to 90%

Storage (packed)

Applicable specification................................................................. ETS 300 019-1-1 Class 1.2

Temperature range ............................................................................................-25 oC to +55 oC

Relative humidity ................................................................................................. 10% to 100%

Handling and Transportation

Applicable specification................................................................. ETS 300 019-1-2 Class 2.3

Temperature range ........................................................................................... -40 oC to +70 oC

Relative humidity ...................................................................................................... up to 95%

EMC Applicable specifications ...............................................................................EN 300 386/2000

Applicable directive ....................................................................... EMC directive 89/336 EEC



Safety Applicable specifications ..................................................................................EN 60950/2000

Applicable CE directive ....................................................................LVD directive 73/23/EEC

Laser Safety Applicable specification.....................................................................................EN 60825-1&2

Reliability

Life

Expected lifetime of the BG-20 .................................................................................... 10 years

Availability

Availability of service for an end-to-end service trail passing through a protected SDH network ......................................... better than 99.999%



426006-2010-013-A00 ECI Telecom Ltd. Proprietary A-1

The primary reference documents for this General Description are:

1. BS ISO/IEC-3309 - Information Technology - Telecommunications and Information Exchange between Systems - High-Level Data Link Control (HDLC) Procedures - Frame Structure.

2. BS ISO/IEC-9595 - Information Technology - Open Systems Interconnection - Common Management Information Services.

3. ETSI EN 300 386-2 - Telecommunication Network Equipment EMC Requirements.

4. ETSI EN 300 132-2 - Power Supply Interface at the Input to Telecommunication Equipment, Operated by Direct Current.

5. ETSI ETR 114 - Functional Architecture of SDH Transport Networks.

6. ETSI ETS 300 119 - European Telecommunication Standard for Equipment Practice.

7. ETSI ETS 300 147 - Synchronous Digital Hierarchy Multiplexing Structure.

8. ETSI ETS 300 232 - Optical Interfaces for Equipment and Systems Relating to the Synchronous Digital Hierarchy.

9. ETSI ETS 300 417 - Generic Functional Requirements for Synchronous Digital Hierarchy Equipment.

10. ETSI ETS 300 462 (Parts 1, 2, 3, 4, 5) - Transmission and Multiplexing (TM) - Generic Requirements for Synchronization Networks; Synchronization Network Architecture; The Control of Jitter and Wander within Synchronization; Timing Characteristics of Slave Clocks Suitable for Operation in Synchronous Digital Hierarchy (SDH) Equipment.

A A Reference Documents

Reference Documents BG-20 General Description

A-2 ECI Telecom Ltd. Proprietary 426006-2010-013-A00

11. ETSI ETS 300 746 - Transmission and Multiplexing; Synchronous Digital Hierarchy; Network Protection Schemes; Automatic Protection Switch (APS) Operation.

12. IEC 917 - Modular Order for the Development of Mechanical Structures for Electronic Equipment Practices.

13. IEC/UL 60950 - Safety of Information Technology Equipment.

14. IEEE 802.3 - IEEE Standard for Information Technology - Telecommunications and Information Exchange Between Systems - Local and Metropolitan Area Networks - Specific Requirements - Part 3: Carrier Sense Multiple Access with Collision Detection (CSMA/CD) Access Method and Physical Layer Specifications.

15. ISO 9595, ISO 9596 - CMISE Specification.

16. ITU-T Recommendation G.650 - Definition and Test Methods for the Relevant Parameters of Single-mode Fibers.

17. ITU-T Recommendation G.651 - Characteristics of a 50/125 µm Multimode Graded Index Optical Fiber Cable.

18. ITU-T Recommendation G.652 - Characteristics of a Single-mode Optical Fiber Cable.

19. ITU-T Recommendation G.653 - Characteristics of a Dispersion-shifted Single-mode Optical Fiber Cable.

20. ITU-T Recommendation G.654 - Characteristics of a Cut-off Shifted Single Mode Optical Fiber Cable.

21. ITU-T Recommendation G.655 - Characteristics of a Non-zero Dispersion Shifted Single-mode Optical Fiber Cable.

22. ITU-T Recommendation G.664 - Optical Safety Procedures and Requirements for Optical Transport Systems.

23. ITU-T Recommendation G.703 - Physical/Electrical Characteristics of Hierarchical Digital Interfaces.

24. ITU-T Recommendation G.704 - Synchronous Frame Structures Used at 1544, 6312, 2048, 8448 and 44 736 kbit/s Hierarchical Levels.

25. ITU-T Recommendation G.707 - Network Node Interface for the Synchronous Digital Hierarchy.

26. ITU-T Recommendation G.708 - Sub-STM-0 Network Node Interface for the Synchronous Digital Hierarchy (SDH).

27. ITU-T Recommendation G.772 - Protected Monitoring Points provided on Digital Transmission Systems.

BG-20 General Description Reference Documents

426006-2010-013-A00 ECI Telecom Ltd. Proprietary A-3

28. ITU-T Recommendation G.774 & G.774.n - SDH Information Model.

29. ITU-T Recommendation G.783 - Characteristics of SDH Equipment Functional Blocks.

30. ITU-T Recommendation G.784 - Synchronous Digital Hierarchy (SDH) Management.

31. ITU-T Recommendation G.803 - Architectures of Transport Networks based on the Synchronous Digital Hierarchy.

32. ITU-T Recommendation G.805 - Generic Functional Architecture of Transport Networks.

33. ITU-T Recommendation G.811 - Timing Characteristics of Primary Reference Clocks.

34. ITU-T Recommendation G.812 - Timing Requirements of Slave Clocks Suitable for Use as Node Clocks in Synchronization Networks.

35. ITU-T Recommendation G.813 - Timing Characteristics of SDH Equipment Slave Clocks (SEC).

36. ITU-T Recommendation G.823 - The Control of Jitter and Wander within Digital Networks, which are based on the 2048 kbit/s Hierarchy.

37. ITU-T Recommendation G.825 - The Control of Jitter and Wander within Digital Networks, which are based on the SDH (Draft).

38. ITU-T Recommendation G.826 - Error Performance Parameters and Objectives for International, Constant Bit Rate Digital Paths at or above the Primary Rate.

39. ITU-T Recommendation G.841 - Types and Characteristics of SDH Network Protection Architectures.

40. ITU-T Recommendation G.842 - Interworking of SDH Protection Architectures.

41. ITU-T Recommendation G.957 - Optical Interfaces for Equipment and Systems relating to the Synchronous Digital Hierarchy.

42. ITU-T Recommendation G.958 - Digital Line Systems Based on the Synchronous Digital Hierarchy for Use on Optical Fiber Cables.

43. ITU-T Recommendation G.959.1 - Optical Transport Network Physical Layer Interfaces.

44. ITU-T Recommendation G.7041 - Generic framing procedure (GFP)

45. ITU-T Recommendation G.7042 - Link capacity adjustment scheme (LCAS) for virtual concatenated signals

Reference Documents BG-20 General Description

A-4 ECI Telecom Ltd. Proprietary 426006-2010-013-A00

46. ITU-T Recommendation M.3010 - Principles for a Telecommunications Management Network.

47. ITU-T Recommendation M.3100 - Generic Network Information Model.

48. ITU-T Recommendation Q.821 - Alarm Surveillance.

49. ITU-T Recommendation Q.822 - Performance Monitoring.

50. ITU-T Recommendations X.217, X.227 - ACSE Specification.

51. ITU-T Recommendations X.219, X.229 - ROSE Specification.

52. RFC-1493 - Definition of Managed Objects for Bridges.

53. RFC-1757 - Remote Network Monitoring Management Information Base.

54. RFC-2108 - Definitions of Managed Objects for IEEE 802.3 Repeater Devices using SMIv2.

55. RFC-2737 - Entity MIB (Version 2).

426006-2010-013-A00 ECI Telecom Ltd. Proprietary B-1

3G Third-Generation Cell-Phone Technology ACO Alarm Cut Off ADM Add-and-Drop Multiplexer ANSI American National Standards Institute ASP Application Service Providers ATM Asynchronous Transfer Mode BBE Background Block Error BER Bit Error Rate BIT Built-In Test BTS Base Station Transceiver Subsystem CAPEX CAPital Expenditure CBS Committed Burst Size CD-VID Customer VLAN ID CID Channel ID CIR Committed Information Rate CLE Customer Located Equipment CO Central Office CORBA Common Object Request Broker Architecture CPE Customer Premises Equipment DCC Digital Communications Channel DCN Data Communication Network DIO Data Input/Output DS-3 Digital Signal Level 3 (44.736 Mbps) DTMF Dual Tone Multi-Frequency DWDM Dense Wavelength Division Multiplexing EIS Ethernet Interface Switch EMC Electromagnetic Compatibility EML Element Management Layer

B B Glossary

Glossary BG-20 General Description

B-2 ECI Telecom Ltd. Proprietary 426006-2010-013-A00

EMS Element Management System EMS-BG-40 BG-40's Element Management System EMS-XDM XDM Element Management System EOC Embedded Overhead Channel, Embedded Operations Channel EOS Ethernet Over SDH EOW Engineering Orderwire EPL Ethernet Private Line EPLan Ethernet Private Local area network ETSI European Telecommunication Standards Institute EVPLan Ethernet Virtual Private Local area network Fast Ethernet 100BaseT. Ethernet at 100 Mbps FCU Fan Control Unit FCS Frame Check Sum FDB Filtering Database FICON Fiber Connection FN Functional Node FTP File Transfer Protocol GbE Gigabit Ethernet GFP Generic Framing Procedure GPRS General Packet Radio Service GSM Global System for Mobile Communication GUI Graphical User Interface

GVRP Generic VLAN Registration Protocol (variation of Generic Attribute Resolution Protocol, GARP)

HO High Order HTML Hypertext Markup Language I/O Input/Output IP Internet Protocol ISDN Integrated Services Digital Network ISP Internet Service Provider ITU-T International Telecommunications Union-Telecommunication LAN Local Area Network LAN FE LAN Fast Ethernet port LAN GE LAN Gigabit Ethernet port LAPS Ethernet over Link Access Procedure LAPF Link Access Procedure for Frame-mode bearer services LCAS Link Capacity Adjustment Scheme LCT Local Craft Terminal LCT-BG-40 BG-40's Local Craft Terminal

BG-20 General Description Glossary

426006-2010-013-A00 ECI Telecom Ltd. Proprietary B-3

LightSoft ECI Telecom Ltd.'s Network Manager LOA Loss of Alignment LOFD Loss of Frame Delineation LOS Loss of Signal LVD Low Voltage Differential MAC Medium Access Control MAN Metropolitan Area Network MDIX Media Dependent Interface Crossover ME Managed Element MLM Meridian Link Module MOW Maintenance Orderwire MS Multiplex Section MSP Multiplex Section Protection MSP-L Linear Multiplex Section Protection MSPP MultiService Provisioning Platform MS-SPRing Multiplex Section Shared Protection Ring

MSTP Multi-Spanning Tree Protocol, Multiplexer Section Termination Point, MultiService Transport Platform

MTNM MultiTechnology Network Management MXC4X Cross-connect Timing and Control Card NE Network Element NEL Network Element Layer NML Network Management Layer NMS Network Management System NNI Network Network Interface NT Network Termination NVM Non-Volatile Memory OADM Optical Add/Drop Multiplexer OCXO Oven Controlled Crystal Oscillator OHA Overhead Access OPEX OPerational Expenditure OSC Optical Supervisory Channel OSNR Optical Signal-to-Noise Ratio OW Orderwire PDH Plesiochronous Digital Hierarchy PD-CoS Provider Domain Class of Service PD-VID Provider Domain VLAN ID PM Performance Monitor POP Point of Presence

Glossary BG-20 General Description

B-4 ECI Telecom Ltd. Proprietary 426006-2010-013-A00

QoS Quality of Service RAN Remote Access Network RDR Remote Database Replication RNC Radio Network Controller RSTP Rapid Spanning Tree Protocol SCSI Small Computer System Interface SDH Synchronous Digital Hierarchy SES Severely Errored Second SFP Small Form-factor Pluggable SIO SDH Input/Output SLA Service Level Agreement SNCP SubNetwork Connection Protection SQ auto sort Sequence number auto sort SQL Structured Query Language SSM Synchronization Status Marker SSP Storage Service Provider STM Synchronous Transfer Mode STM-1 Synchronous Transport Module 1, 155.52 Mbps STM-4 Synchronous Transport Module 4, 622.08 Mbps STP Spanning Tree Protocol, Section Termination Point TCSF GFP Tx Client Signal TDM Time Division Multiplexing TM Terminal Multiplexer TMF TeleManagement Forum TMN Telecommunications Management Network UAS Unavailable Seconds UNI User Network Interface UPSR Unidirectional Path Switched Ring VB Virtual Bridge VC Virtual Container VCG Virtual Concatenation Group VID VLAN ID VLAN Virtual Local Area Network VPN Virtual Private Network WAN Wide Area Network

426006-2010-013-A00 ECI Telecom Ltd. Proprietary I-1

A

Applications Cellular • 2-4 Data • 2-1 Metro-Access • 2-3 Private Network • 2-5

Architecture Data Services • 3-3 TDM Configuration Options • 3-2

Multi-ADM and Multi-TM • 3-3 Single ADM/TM • 3-2

Traffic I/O Interfaces • 3-5

B

BG-20 Applications • 2-1 Features and Benefits • 1-4 Management • 6-1 Physical Description • 7-1 Protection • 5-1 Specifications • 8-1 System Architecture • 3-1 System Design • 4-1

C

Components and Functions • 4-1 Control and Communication

Communication with External Equipment • 4-3

Ethernet Interface and Switching Unit • 4-7

Internal Control and Processing • 4-3 Overhead Processing • 4-5 PDH Interface Unit • 4-6 Power Feed • 4-8 SDH Interface Unit • 4-6 Software Configuration and Backup •

4-3 Timing and Synchronization • 4-4 Traffic and Cross-connect

Functionality • 4-5

E

EMS-BG-40 • 6-9

9 Index

Index BG-20 General Description

I-2 ECI Telecom Ltd. Proprietary 426006-2010-013-A00

L

LCT-BG-40 • 6-10 LightSoft Network Manager • 6-3

Fault Management • 6-7 GUI Cut-through • 6-7 Management Interfaces • 6-4 Redundancy and Security • 6-8 Topology Management • 6-5 Trail Configuration • 6-6 User Interface • 6-4

M

Management Architecture • 6-2 Client/Server Architecture • 6-3 EMS-BG-40 • 6-9 LCT-BG-40 • 6-10 LightSoft • 6-3

Fault Management • 6-7 GUI Cut-through • 6-7 Management Interfaces • 6-4 Redundancy and Security • 6-8 Topology Management • 6-5 Trail Configuration • 6-6 User Interface • 6-4

MXC20 • 4-2, 4-3, 4-4, 4-5, 4-7, 4-8, 7-1, 7-2, 7-3

P

Protection Ethernet Service Protection • 5-3 SDH Path/Circuit Protection Schemes

• 5-1 Dual Route Path Protection • 5-2 SNCP • 5-3

R

Rack Installation • 7-2

S

Specifications • 8-1 Cross connect • 8-1 Ethernet • 8-6 I/O Interfaces • 8-2 Jitter and Wander • 8-2 Management • 8-4 Physical • 8-7 Redundancy • 8-2 Synchronization • 8-2 Traffic • 8-2

System Design Control and Communication • 4-3 Ethernet Interface and Switching Unit

• 4-7 Overhead Processing • 4-5 PDH Interface Unit • 4-6 Power Feed • 4-8 SDH Interface Unit • 4-6 Timing and Syncronization • 4-4 Traffic and Cross-connect

Functionality • 4-5

T

Trails Configuration • 6-6 DWDM Management • 6-7 Ethernet Management • 6-7 SDH Management • 6-6

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