Line Drawer Faults; Link Failure - Nortel DMS-100 Series Maintenance Manual

2-30 Functional overview
addition to the lines of the in-service unit. This function, called takeover, is an
automatic maintenance feature of the LCM configuration. For more
infomation, refer to Takeover capability. When one of the following fails, the
LCA shelf goes into takeover:
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Line drawer faults

A BIC or line card with a fault causes a fault condition in a line drawer. This
fault is not serious enough to cause a takeover.

Link failure

Link failures include the following:
DS-1 link fault
Link failures are normally associated with the DS-1 interface cards in the host
controller, DS-1 link or DS-1 interface cards in the OPM. Monitoring is
performed through operational measurements (OM) that indicate when counts
exceed maintenance or out-of-service thresholds.
The host controller performs the following actions when faults occur on these
lines:
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The host controller assigns channels again when faults occur on these links.
Operating company personnel can obtain the bipolar violation (BpV) count at
the OPM with the following methods:
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The BpVs are not severe enough to raise an alarm. BpVs can signal failure of
a DS1 link.
The host controller or the OPM can detect faults, like BpVs, because the
signals on a DS-1 link travel in two directions. The OPM notifies the host
297-8361-550 Standard 04.02 December 2004
the mate processor
the digroup control card in the mate unit
the power converter in the mate unit
the ANI and coin voltages in the mate ringing generator
the mate LCC in the HIE shelf
maintains and tests the DS-1 links
generates alarms for link defects
reassigns channels
Post the host XPM with the REMOTE parameter at the carrier level of the
MAP display.
Post the host XPM and issue the DETAIL command with the REMOTE
parameter.