ZyXEL Communications Multi-service Access Platform MSAP2000 - Manual (Page 144)

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.