363-206-285
Circuit Pack Descriptions
Issue 3 June 2001
7-111
22D-U OLIU Circuit Pack Description 7
Purpose of Circuit 7
The 22D-U OLIU circuit pack is used to interconnect colocated DDM-2000 OC-3
and OC-12 shelves or
SLC
â
-2000 at the OC-3 rate. The 22D-U OLIU circuit pack
performs the optical/electrical conversion between the optical interconnect signal
level 3 (IS-3) and STS-3 signals. The 22D-U OLIU circuit pack also does MUX/
DEMUXing between STS-3 and three STS-1 signals and SONET transport
overhead access. It also provides routing of the STS-1s between the IS-3
interface and other main and function unit slots in the shelf.
22D-U OLIU Faceplate Indicators 7
The 22D-U OLIU circuit pack faceplate indicators are shown in Figure 7-41. 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).
Figure 7-41. 22D-U OLIU Circuit Pack
OLIU
x
x
x
x
x
Universal
Optical
Connectors
AT& T
AT& T
22D-U
AT & T
FAU LT
ACTIVE
S1:1
IN
OUT
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