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Circuit Pack Descriptions
Issue 3 June 2000
7-75
26G2-U OLIU Circuit Pack Description
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Purpose of Circuit
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The 26G2-U OLIU circuit pack interfaces with a 1310 nm optical line in the
transmit and receive directions. It provides an interface between the OC-1 optical
line and the electrical STS-1 and VT-G signals. The fiber is accessed via a pair of
universal optical connectors on the 26G2-U faceplate that supports ST, SC, and
FC type optical connectors. Both single mode and multi-mode facilities are
supported.
The 26G2-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 26G2-U OLIU may be used in the main slots of the DDM-2000 FiberReach
wideband shelf or the function unit slots of the DDM-2000 OC-3 shelf (Group 4 or
later).
26G2-U OLIU Faceplate Indicators
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The 26G2-U OLIU circuit pack faceplate indicators are shown in Figure 7-30. The
red FAULT LED lights on detection of circuit pack hardware failure. In the event of
an incoming OC-1 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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