Line Interface Units - Coastcom D/I Mux III System User Manual

Line Interface Units

The Line Interface Units (LIUs) give the D/I Mux III Channel Bank, Drop-and-Insert, and Dual
Channel Bank (DCB) capabilities when used in conjunction with the CCU/AMCU. The LIUs
select T1 line coding, framing, and alarm options. Select the options through software whenever
possible. Use the LIU switches when a control terminal is not available.
See Tables 3-7 and 3-8 for lists of LIU front panel LED indicators and DIP switches.
Front LED Color
Panel
Label
LOC
YEL
CGA
FRM
B7
BPV
0-DEN
AIS
RX
TX
Chapter 3. Installation
Table 3-7. LIU LED Indicators
P/N 30309-104A and 30309-114A
Red Local alarm, T1 framing or input signal lost
Yellow Remote alarm, T1 remote alarm received
Yellow Carrier Group Alarm, carrier taken off-line
Red Receiving framing errors
Green Bit 7 stuffing selected
Yellow Receiving excessive Bipolar Violations
Red Receiving more than 32 consecutive zeros
Red Receiving unframed all ones
Red Network loop code Received
Yellow Network loop code Transmitted
Description
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