Lcm Rextest - Nortel DMS-100 Series Maintenance Manual

1-62 Maintenance overview
Faults that occur on a BIC drawer affect call processing regardless of which
unit is in service and controlling that drawer. Since the full in-service tests
use the DCC, it must first be determined that the fault is not in the DCC,
where takeover is justified. If takeover occurs as a result of a reported
drawer fault, the DCC is at fault even though the LCM has failed the BIC
tests.
In the takeover mode, the inactive unit DCC cannot access any drawers for
call processing. However, the inactive unit DCC can access any drawer for
testing. The active LCM unit still has access to all drawers through its DCC.
Valid drawer faults do not take an LCM unit out-of-service. However, the
status of the unit is still ISTb. The ISTb reason is either Self Test or Diag
Fail, depending on which test failed and caused the ISTb condition.
Additional diagnostic information is available for LCM shelves equipped
with the NT6X51AB expanded memory board. After the CC has detected
an LCM unit has ISTb, the unit can still be made SysB by too many
unsolicited messages being received.

LCM REXTEST

The LCM routine exercise test (REXTEST) consists of running
out-of-service diagnostics for each LCM unit, as well as in-service
diagnostics for each unit in both normal and takeover modes. This test is
controlled by office parameter NODEREXCONTROL in table OFCVAR.
It may not be possible to test every LCM in the office during the REX
interval. In this case, when the next interval starts, REX will pick up where
it left off during the previous interval. It takes up to 15 min to perform a
REX test on an LCM.
297-8381-550 Standard 02.02 April 1999
checksum_inactive_bank
lcc_fault_code
comm_iuc_la_tst
bic_scan_test_all
bic_act_test_all
power_converter_test
test_lc
ring_mux_relays_test
cside_link_looparound_test
msg_test