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Circuit Pack Descriptions
7-82
Issue 3 June 2000
28G-U/28G2-U OLIU Circuit Pack Description
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Purpose of Circuit
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The 28G-U/28G2-U OLIU circuit pack interfaces with a 1310 nm optical line in the
transmit and receive directions. It provides an interface between the OC-3 optical
line and the electrical STS-1 and VT-G signals. The fiber is accessed via a pair of
universal optical connectors on the 28G-U/28G2-U faceplate that supports ST,
SC, and FC type optical connectors. Both single mode and multi mode facilities
are supported.
The 28G-U/28G2-U OLIU circuit pack also has the following functions:
■
Active VT timeslot interchanging in the function slot
■
Access to low speed slots and main slots from the function slot
The 28G-U/28G2-U OLIU must be used in the main slots of the DDM-2000
FiberReach wideband shelf.
28G-U/28G2-U OLIU Faceplate Indicators
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The 28G-U/28G2-U circuit pack faceplate indicators are shown in Figure 7-32.
The red FAULT LED lights on detection of circuit pack hardware failure. In the
event of an incoming OC-3 signal failure, this LED will flash on and off. The green
ACTIVE LED lights when the circuit pack is active (carrying service).
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