Lucent Technologies DDM-2000 OC-3 User Manual

363-206-285
Circuit Pack Descriptions
7-148 Issue 3 June 2001
27G-U/27G2-U OLIU Quick Reference Summary 7
Transmit Functions 7
Major transmit functions of the 27G-U/27G2-U OLIU circuit pack are as follows:
■ Selects STS-1 inputs from MXRVO, STS1E, or other OLIU circuit packs
■ Provides VT1.5/STS-1 signal cross-connections
■ Adds SONET transport overhead and, if VT1.5 cross-connected, adds
STS-1 path overhead
■ Scrambles the two selected STS-1 signals to prepare for optical conversion
■ Uses a laser transmitter to produce a SONET compatible OC-1 optical
signal from each STS-1 electrical signal.
Receive Functions 7
The following are major receive functions of the 27G-U/27G2-U OLIU circuit pack:
■ Receives two SONET compatible OC-1 optical signals and converts each
to an electrical STS-1 signals
■ Extracts STS-1 rate clock and retimes the received data
■ Extracts transport overhead and, if VT1.5 cross-connected, extracts STS-1
path overhead from each STS-1
■ Processes the STS-1 pointer and frame-synchronizes the STS-1 signals
■ Processes the VT1.5 pointers and frame-synchronizes the VT1.5 signal, if
VT1.5 cross-connected
■ Provides VT1.5/STS-1 signal cross-connections
■ Processes the received clock and provides a reference clock to the TG
circuit packs
■ Provides express processing for VT AIS.

Lucent Technologies DDM-2000 OC-3 Specifications

General

Brand	Lucent Technologies
Model	DDM-2000 OC-3
Category	Multiplexer
Language	English