Lucent Technologies DDM-2000 OC-3 User Manual

363-206-285
Circuit Pack Descriptions
7-116 Issue 3 June 2001
Power Circuitry 7
Power for the 22D-U OLIU circuit pack is provided by a DC-to-DC converter
located on the circuit pack. The converter supplies +5 volts and −5.2 volts. Both A
and B −48 volt backplane busses supply power to the converter through diode
ORed circuit pack-mounted power select circuits and a circuit pack-mounted fuse.
Failure of the fuse or converter causes the red FAULT LED to light.
22D-U OLIU Quick Reference Summary 7
Transmit Functions 7
The following are the major transmit functions of the 22D-U OLIU circuit pack:
■ 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
■ Converts the STS-3 electrical signal to an IS-3 optical signal and transmits
it over the fiber.
Receive Functions 7
The following are major receive functions of the 22D-U OLIU circuit pack:
■ Receives an IS-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 STS-1/VT1.5 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