Nortel DMS-100 Series Maintenance Manual page 75

LCMREX test flow
A REX test for an LCM includes the following procedure:
1 If both units of the LCM are in service, unit 0 is made SysB; a PM128
state change log is generated with the reason
LCM node status is made ISTb, and a minor alarm is generated.
2 In-service diagnostics are run on unit 1, which is in takeover; if any
diagnostics fail, the unit is placed ISTb and a PM181 log is generated.
3 Unit 0 is returned to service. Out-of-service and in-service diagnostics
are run. If out-of-service diagnostics fail, the unit is left SysB, a major
alarm is raised, and PM106 is generated. If the unit is returned to service
successfully and the in-service diagnostic fails, the unit is placed ISTb
and a PM181 log is generated.
4 If unit 0 is returned to service successfully, these steps are repeated for
unit 1.
If a REX test fails, a PM600 log is generated. The PM600 log initiates a
major alarm for the XPM that failed the REX test. The major alarm appears
at the MAP terminal under the PM banner at the top of the display. A
PM181 log is generated after a successful REX test.
If an InSv or OOS diagnostic test fails, the REX test failure reason includes
the mnemonic (an easy-to-remember abbreviation) of the diagnostic that
failed and the unit that failed (0 or 1).
The QUERYPM, QUERYPM FLT and TST REX QUERY, commands
contain information about the last REX test. Both manually and
system-initiated REX tests store and display a new date, time, and status
(passed or failed) in the REX test maintenance record. Passed means the
REX test completed with no errors. Failed means the REX test did not
complete because of an error. This information is available through the
QUERY PM and TST REX QUERY commands. If the REX test fails, the
user either performs a manual RTS, a manual REX test, or an automated
REX test to return the LCM to service from ISTb.
The following restrictions apply to REX tests:
Up to four LCM_REX_TESTs can be run concurrently if the HOST
XPM they subtend to is not being REX tested.
For a REX test to run, the node must be InSv or ISTb because of a REX
test failure.
If a restart occurs while a REX test is in progress, the PM600 log is not
generated because the restart deallocates the temporary data store used to
build the PM600 log.
Maintenance overview 1-63
REX in progress
DMS-100 Family Maintenance Manual ABSK007
, the