Nortel DMS-100 Series Maintenance Manual page 98

1-82 Maintenance overview
The following message appears when you enter the TST COVREX NOW
command.
Line concentrating module and ESA-independent REX test
The scheduler initiates REX tests on an LCM. When the tests complete, the
scheduler initiates the ESA REX test. A manually implemented LCM REX
test does not implement an ESA REX test. As a result of a REX test that is
not successful, the LCM is set ISTb if INSV diagnostics fail. The LCM is
set SysB if OOS diagnostics fail.
Fault indicators
A REX test that is not successful sets the LCM unit to ISTb or SysB with a
reason of REX failed. Audits on LCMs are performed every 10 min and run
INSV tests. The ISTb flag remains with a REX failed reason. If the audit is
not successful and the audit detects additional failure conditions, the audit
contributes to the ISTb list. If the LCM is SysB and a successful system
RTS is performed, the unit is returned to ISTb. The system is not returned
INSV with the REX failed reason. To remove the ISTb state, the LCM must
complete a successful manual or scheduled REX test.
The system generates the node assessment graph log (NAG400) every hour.
The system also generates this log in response to the NAG command, to list
nodes that are not INSV. The REX_INFO field of log NAG400 displays the
results of the latest REX test. For LCMs, the LCM_REX_TEST result
appears in the list first. A colon separates this result from the
LCMCOV_REX_TEST result. For additional information about NAG400
logs, refer to the RLCM Related Logs section of this document.
The CI level NAG command allows operating company personnel to display
every OOS node. The MAP response to the NAG command is like the
response presented in the NAG400 log report. The command and log report
are part of the node assessment graph (NAG) feature. This feature provides
a snapshot of nodes in the system that are OOS or have a REX issue.
Operating company personnel can include the offline nodes in the output
through the entry of the command string NAG ALL. You can turn on and
off the log report function, which runs every hour when you enter the
command string NAG ON or NAG OFF.
297–8351–550 Standard 04.01 August 1999
Example of a MAP response:
LCM REM1 00 0 will be put into takeover mode during the
COV REX
Do you want to continue with the COV REX test
Please confirm ("YES", "Y", "NO", or "N")