Cisco Cisco MGX-FRSM-HS2 B Serial Frame Service Module 数据表

Data Sheet

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Cisco MGX Service Resource Module: Enhanced

The Cisco

MGX

Service Resource Module-Enhanced Model B (SRME/B) is designed for use

with the Cisco MGX 8230, MGX 8250, MGX 8830/B, MGX 8850/B, and MGX 8880 platforms. The

Cisco MGX SRME/B provides three major functions for service modules: bulk distribution of T1

and E1 traffic, bit error rate testing (BERT) of T1 and E1 lines and ports, and 1:N redundancy.

The Cisco MGX SRME/B is an enhanced version of the existing Cisco MGX SRM, operating at line

speeds of OC-3 or T3. The Cisco MGX SRME/B provides the existing functions of the Cisco MGX

SRM 3T3/C, such as bulk distribution, 1:N redundancy, and BERT. It supports either one SONET

or SDH interface using SMFIR-155 (optical) and SMB-155 (electrical) back cards or three T3

interfaces using legacy SMB back cards.

The Cisco MGX SRME/B has a similar architecture to the current SRM-3T3/C with the following

additional features:

●

Bulk distribution of T1 traffic to all 12 service-module slots using 1 SONET or SDH OC-

3/STM-1 interface

●

Bulk distribution of T1 traffic to all 12 service-module slots using up to 3 T3 interfaces

●

1:1 SRM hot-standby redundancy

●

Card-to-card linear (1+1) automatic-protection-switching (APS) support for optical

interfaces

●

Elimination of back-card requirement for Cisco MGX SRME/B operation when bulk

distribution is not required

Key Features

Bit Error Rate Testing

The Cisco MGX SRME/B provides the BERT service to narrowband service modules, such as the

Cisco MGX Frame Service Module, the Cisco MGX Circuit Emulation Service Module, the Cisco

MGX ATM UNI Service Module, and the Cisco MGX VISM-8T1/E1 Voice Interworking Service

Module. After a service-module line or port is put into loopback mode, the Cisco MGX SRME/B can

generate a test pattern over the looped line or port, read the received looped data, and report on

the error rate. This operation can be performed on a complete T1 or E1 line, on a fractional T1 or

E1 line, on a DS-0 bundle (N x DS-0), or on a single DS-0 channel. The Cisco MGX SRME/B can

support BERT on only one line or channel at a time. BERT can generate a variety of test patterns,

including all ones, all zeros, alternate one zero, double alternate one zero, 2

– 1, 2

– 1,

– 1, 2

– 1, 1 in 8, 1 in 24, digital data service 1 (DDS1), DDS2, DDS3, DDS4, and DDS5.

Bulk Mode Distribution

In the bulk mode distribution, the Cisco MGX SRME/B uses its back card to receive a signal from

its OC-3/STS3 or STM-1 interface. The SONET or SDH signal is broken down into its T1

components and then distributed through the distribution bus to the appropriate service module. In

this mode, service modules do not require any back cards and only the Cisco MGX SRME/B needs

to have its back card. Hence, it greatly reduces cable clutter behind the shelf.