Lucent Technologies DDM-2000 OC-3, User & Service Manual

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363-206-285
Circuit Pack Descriptions
Issue 3 June 2001 7-103
22F/22F-U/22F2-U OLIU Circuit Pack Description 7
Purpose of Circuit 7
The 22F/22F-U/22F2-U OLIU circuit pack performs the optical/electrical
conversion between the OC-3 and STS-3 signals, multiplexing between STS-3
and three STS-1 signals and SONET transport overhead access. This circuit pack
also provides routing of the STS-1s and VT1.5s between the OC-3 interface and
other main and function unit slots in the shelf and DS1/DS3 add/drop and ring
capability. When used to perform DS1/DS3 add/drop or VT1.5 routing, STS-1 path
overhead access is also provided.
The 22F-U provides a universal optical connector capable of interfacing with
STS-1. The 22F2-U provides additional VT1.5/STS-1 path signal monitoring to
support VT1.5/STS-1 path protection switching. All three circuit packs have the
same optical interface specifications.
22F/22F-U/22F2-U OLIU Faceplate Indicators 7
The 22F/22F-U/22F2-U OLIU circuit pack faceplate indicators are shown in
Figure 7-39.
The red FAULT LED lights on detection of circuit pack hardware failure. In the
event of an incoming signal failure, this LED will flash on and off.
The green ACTIVE LED lights when the circuit pack is active (carrying service).