beautypg.com

Optical interface module (oim) – ZyXEL Communications Multi-service Access Platform MSAP2000 User Manual

Page 144

background image

7. Product Specification

MSAP2000 Technical Manual V3.0

7-37

7.14.

Optical Interface Module (OIM)

Overview

The Optical Interface Module (OIM) provides standard SDH STM-1
optical trunking, to connect to different Network nodes. Apart from
data transmission between different nodes, this Module also provides
SDH performance monitoring and fault reporting.

Features
And
Benefits

„ Panel LEDS indicate status, faults, alarms, and network connection
„ STM-1 optical Interface complies with ITU-T G.957 standards
„ Timing Recovery circuit, with ultra-low jitter
„ Insertion and monitoring of STM-1 Overhead Byte
„ Provides 1+1 protection switching
„ Protection switch mechanisms can be setup based on the

performance threshold value of the optical interface. Its switch
threshold (such as BER) can be either selected by the User, or
setup internally. In the event of protection switch failure, an alarm
warning will be shown.

„ Alarm and fault monitoring and reporting
„ Provides Digital cross-connect functions for all STM-1 time slots
„ Synchronous clock timing for Main Power Modules
„ Use of non-volatile memory devices to store performance data

Function
Diagram

Application

OIM is used for trunk interface and is similar to the functions provided

by SM1, except the optical transceiver is fasten and not replaceable in

the field.