Nortel DMS-100 Series Maintenance Manual page 52

1-36 Maintenance overview
The following paragraphs describe the functions of these system audits as
the functions affect LCC and DS-1 circuits.
Link control card maintenance
The OPAC monitors the status of the LCC of the OPAC. The OPAC
performs this action to make sure of the following:
The system rewrites control data at normal intervals.
DS-1 interface card maintenance
For each DS-1 interface card of the OPAC, the OPAC automatically
monitors the BpV counter. The OPAC notifies the CM when the count
exceeds the threshold of 1 BpV per 10
The OPAC monitors the loss of frame indicator for the DS-1 links. The
OPAC turns on an outgoing alarm for any frame loss of more than 2.5 s.
The system removes the outgoing alarm when frame restores for 10 s.
When the OPAC detects DS-1 slips, the OPAC increases a slip counter. The
OPAC provides a message-driven interface to allow the host office to query
the counter from the CARRIER MAP level. The system rewrites control
data to the DS-1 cards at normal intervals.
LCM drawer maintenance
A system audit runs each 10 min for each LCM and attempts to RTS any
drawers in the SysB state. If the system detects any faults, the system tests
and handles drawers in the ISTb state.
The following table notes LCM unit states and corresponding tests.
Full in-service tests
State
InSv
Bsy, Sane
Bsy, Insane
297-8211-550 Standard 05.01 August 1999
the system correctly transmits control data to the LCC
an inactive LCC clock runs fault free
In-service tests
In-service tests
In-service tests
Stand-alone in-service
tests
3
bits (10 kb).
Busy
Out-of-service tests
Full (all) tests
Stand-alone out-of-service
tests