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Circuit Pack Descriptions
7-134 Issue 3 June 2001
26G2-U Circuit Pack Description 7
Purpose of Circuit 7
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 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). The fiber is accessed via a pair of universal optical connectors on the
26G2-U faceplate that supports
ST
â
, SC, and FC type optical connectors. Both
single mode and multi mode facilities are supported.
26G2-U OLIU Faceplate Indicators 7
The 26G2-U OLIU circuit pack faceplate indicators are shown in Figure 7-47. 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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