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Maintenance Description
9-14 Issue 3 June 2001
Non-Ring Interfaces 9
Figure 9-4 through Figure 9-6 are examples of the maintenance signals used by
the DDM-2000 OC-3 Multiplexer. In these figures, the labels on the arrows
pointing into the DDM-2000 OC-3 Multiplexer indicate the maintenance signals
and failure conditions recognized by the DDM-2000 OC-3 Multiplexer. The labels
on the arrows pointing out of the DDM-2000 OC-3 Multiplexer indicate the signals
generated by the DDM-2000 OC-3 Multiplexer in response to the indicated
incoming signals or failure conditions. The Xs indicate points of failure, either
within the DDM-2000 OC-3 Multiplexer or in upstream equipment. Unlabeled
arrows indicate normal transmission except for OC-3 line AIS; maintenance
signaling is in response to unprotected failures. The DS1, DS3, EC-1, STS, and
VT interfaces in Figure 9-4 though Figure 9-6 are cross-connected to function unit
slots.
The DS1, DS3, EC-1, STS, and VT interfaces in ring applications, Figure 9-7
through Figure 9-9, are cross-connected to main OLIUs.
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