Nortel DMS-100 Series Maintenance Manual page 129

To prevent conflicts, all concurrent REX tests of XPMs and LCMs are planned
by the SREX controller, as seen in the following figure SREX system
dependencies. The LCM SREX subsystem registers the LCM_REX_TEST
class and identifies dependencies with other REX_TEST types during initial
program load (IPL). As LCM nodes are added to the SREX database, the
controller automatically datafills entries with defaults in table REXSCHED.
Figure 4-3 SREX system dependencies
IPL
Register
LCM
SREX database
LCM objects
The converter voltage and ring test sections of LCM_REX_TEST require wait
states and distinct test resources that cause delays that are not acceptable in
SREX main task execution. LCMCOV_REX_TEST, running at a lower
priority, implements these tests separately from the LCM_REX_TEST.
LCMCOV_REX_TEST requires logical test unit (LTU) connections in the
maintenance line card. An LCM unit can access the single LTU when the other
unit is out of service. This resource limitation prevents concurrent
LCMCOV_REX_TEST execution. The datafill of the PARALLEL execution
Star Remote System automatic maintenance 4-29
LCM REX
LCM
SREX
Aspect
Gates
SREX controller
Table OFCVAR
NODEREXCONTROL
DMS-100 Family NA100 Star Remote System XPM15 and up
LCM TC
LCM
Objects
Table REXSCHED
LCM_REX_TEST
LCMMTC
LCM CI
Manual
TST REX