Circuit Pack Descriptions
Issue 8.0 July 2002
7-51
Maintenance Signal Functions 7
The STS1E circuit pack performs the following maintenance signal functions:
a. Detects incoming (from the cross-connect panel) EC-1 loss of signal
(LOS), loss of frame (LOF), loss of pointer (LOP), signal degrade (SD)
based on the B2 error rate, and EC-1 line AIS
b. Inserts STS-1 path AIS in each STS-1 tributary of the 155.52 Mb/s signal
transmitted toward the OC48 TRMTR circuit pack when incoming (from the
cross-connect panel) EC-1 LOS, LOF, LOP, or EC-1 line AIS is detected
c. Detects loss of pointer (LOP) in the 155.52 Mb/s signal from the OC48
RCVR circuit pack and inserts STS-1 path AIS in the EC-1 signals
transmitted toward the cross-connect panel
d. Inserts STS-1 path AIS in each STS-1 tributary of the 155.52 Mb/s signal
transmitted toward the OC48 TRMTR circuit pack and in the EC-1 signals
transmitted toward the cross-connect panel when an internal fault is
detected.
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