Circuit Pack Descriptions
Issue 8.0 July 2002
7-93
later releases, the OC48 TRMTR circuit pack may switch to (select) the standby
51.84 Mb/s signal (STS-1 tributary) from the secondary node. This completes the
circuit from the secondary node to the termination node in the ring.
Fault Detection Circuitry 7
Monitoring and Testing. 7The board controller circuit monitors all the activities on
the circuit pack. The OC48 RCVR A/D circuit pack has an in-service and
out-of-service built-in test capability. An out-of-service test is performed whenever
the OC48 RCVR A/D circuit pack resets or is commanded to reset by the LNCTL
circuit pack through the board controller local area network (BCLAN). When the
OC48 RCVR A/D is inserted in a slot, an out-of-service test is also performed.
In-service testing is continuous. The board controller circuit reports errors when
they occur to the LNCTL circuit pack via the BCLAN.
Performance Monitoring. 7The OC48 RCVR A/D circuit pack provides
performance-monitoring circuitry for the following performance-monitoring
parameters:
â– Received optical power
â– Loss of signal
â– Loss of frame
â– Bit error rate thresholds.
When an incoming line AIS, high speed defect, or internal fault is detected, the
OC48 RCVR A/D circuit pack performs the following:
â– Generates an STS-1 path AIS (if possible, since clock may not be
available) toward the low speed interface circuit pack
â– Signals the OC48 TRMTR circuit pack to insert a remote defect
indicator-line (RDI-L) signal.
The OC48 RCVR A/D circuit pack passes through any remote defect
indicator-path (RDI-P) signals and embedded DS3 AIS to the DS3 circuit packs.
The OC48 RCVR A/D circuit pack also passes through any embedded STS-1
path AIS to the low speed interface circuit packs. The OC48 RCVR A/D also
detects any incoming RDI-L signals.
Power Circuitry 7
The OC48 RCVR A/D circuit pack receives two sources of −48 volts that are diode
OR'd, fused, and filtered. Modular DC-to-DC power converters produce +5 and
−5.2 volts used on the circuit pack.
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