System Rex Controller - Nortel DMS-100 Series Maintenance Manual

a manual REX test, or an automated REX test to return the XPM to service
from ISTb condition.
A REX test maintenance record is stored for each XPM. The record contains
the following information:
• REX test scheduler, if the XPM is in the system
• date, time, and result (passed or failed) of the last REX test
• failure reason, diagnostics failures, and a list of cards with faults, if
applicable, if the last REX test failed
• date and time of earlier failed REX test
• date and time of first passed REX test following the earlier failure
The following restrictions apply to REX tests:
• The system REX test controller runs a REX test on one XPM at a time if
the office uses the NT-40 processor. However, SuperNode supports
concurrent REX testing for up to ten XPMs with the same REX test class.
• Up to four LCM_REX_TESTs can be run at the same time if the HOST
XPM they connect to is not being REX tested.
• The LCM_REXCOV test for converter and ringing voltages in LCM are
planned separately by the system routine exercise (SREX) scheduler.
• 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
output because the restart deallocates the temporary data store used to
build the PM600 log.

System REX controller

The SREX controller provides the SuperNode switch with a SREX controller
that coordinates all system REX tests under a common REX test scheduler.
This feature allows LCM REX tests to be planned while other REX tests are
in progress. The SREX test controller makes it easier to perform a REX test
on the whole switch, including all peripherals such as the Star Hub in less time.
REX tests are performed to provide early indication of faults that can impact
service and to allow operating company personnel to take corrective measures.
Star Remote System automatic maintenance 4-27
DMS-100 Family NA100 Star Remote System XPM15 and up