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Circuit Pack Descriptions
Issue 1 December 1997 7-51
21D/21D-U OLIU Circuit Pack Description 7
Purpose of Circuit 7
The 21D/21D-U OLIU circuit pack is used to interconnect colocated OC-3 and
OC-12 shelves at the OC-3 rate. It performs the optical/electrical conversion
between the optical interconnect signal level 3 (IS-3) and STS-3 signals. It also
does the multiplexing between STS-3 and three STS-1 signals and provides
SONET transport overhead access.
21D and 21D-U OLIU Faceplate Indicators 7
The 21D/21D-U OLIU circuit pack faceplate indicators are shown in Figure 7-21.
The red FAULT LED lights on detection of circuit pack hardware failure or by loss
of circuit pack +5 V DC. 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 7-21. 21D and 21D-U OLIU Circuit Packs
FAU LT
ATIVCE
Lucent
S1:1
21D
OLIU
x
x
x
x
x
FAU LT
ATIVCE
Lucent
S1:1
OLIU
x
x
x
x
x
Lucent
Lucent
IN
OUT
21D-U
Universal
Optical
Connectors
IN
OUT
R
ST Connectors
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