Chapter 5. Diagnostics
170
Table 5-3. LIU Front Panel
Legend Indication Classification
LOC Loss of T1 framing for more than
450 milliseconds
Major
YEL B2 = 0 for all received DS0s, or
yellow alarm in FDL
Major
CGA Trunk conditioning; activated 2.5
seconds after loss of frame
Informational
FRM Framing errors on incoming T1 Major
B7 Bit 7 stuffing active Informational
BPV BPVs above threshold shown on
ERT screen (refer to Chapter 4)
Minor
0-DEN More than 32 consecutive zeros
on incoming T1
Major
AIS Receiving Alarm Indication Signal
(unframed all ones)
Major
LP Codes Description Classification
RX Network loop code being received Informational
TX Network loop code being
transmitted
Informational
TX LP Description Classification
Push-button Commands for GND loopback N/A
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