Lucent Technologies DDM-2000 OC-3 User Manual

363-206-285
Circuit Pack Descriptions
7-124 Issue 3 June 2001
Power Circuitry 7
Power for the 22G-U/22G2-U/22G3-U/22G4-U OLIU circuit pack is provided by
two DC-to-DC converters located on the 22G-U/22G2-U/22G3-U
/22G4-U OLIU
circuit pack. The converters supply +5 volts. Both A and B −48 volt backplane
busses supply power to the converters through diode ORed circuit pack-mounted
power select circuits and a circuit pack-mounted fuse. Failure of the fuse or
converters causes the red FAULT LED to light.
22G-U/22G2-U/22G3-U/22G4-U OLIU Quick
Reference Summary 7
Transmit Functions 7
Major transmit functions of the 22G-U/22G2-U/22G3-U/22G4-U OLIU circuit pack
are as follows:
■ Selects STS-1 inputs from MXRVO, DS3, 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
■ Byte-interleaves and scrambles the three selected STS-1 signals to
produce an STS-3 signal
■ Uses a laser transmitter to produce a SONET standard OC-3 optical signal
from an STS-3 electrical signal.
Receive Functions 7
The following are major receive functions of the 22G-U/22G2-U/22G3-U/22G4-U
OLIU circuit pack:
■ Receives a SONET standard OC-3 optical signal and converts it to an
electrical STS-3 signal
■ Extracts STS-3 clock and retimes the received data
■ Demultiplexes the STS-3 signal into three STS-1 signals
■ Extracts transport overhead and, if VT1.5 cross-connected, extracts path
overhead
■ 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

Lucent Technologies DDM-2000 OC-3 Specifications

General

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