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:
■ Received optical power
■ Loss of signal
■ Loss of frame
■ 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:
■ Generates an STS-1 path AIS (if possible, since clock may not be
available) toward the low speed interface circuit pack
■ 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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