6.5 Analyze and Clear Non-Diagnosable Switching Module Memory Errors
OVERVIEW
This procedure contains information for clearing an intermittent memory fault in the
Module Controller/Time Slot Interchange (MCTSI) in a switching module.
Typically, the fault causes either "REPT SM HWLVL MP PARITY-ERROR"
"CORRBITERR" or "MEMSYSTEM" interrupts when the affected side of the MCTSI is
active (ACT) or an attempt to restore that side of the MCTSI is failing with an "REPT
SM HASHSUM FAILURE" printout. However, the fault is so intermittently "soft" that
it cannot be detected by the normal MCTSI diagnostics.
The switching module may have degenerated to a very undesirable state where the
ACT side of the MCTSI is detecting memory errors, but it cannot be removed from
service because the standby side is out of service (OOS) and cannot be restored due to
the errors in the ACT side. Step 3 of the procedure addresses this special case.
PROCEDURE
1. Collect the associated "REPT SM HWLVL" interrupt or "REPT SM HASHSUM
FAILURE" printouts.
2. Using the printouts, determine which side of the MCTSI and which memory pack
(TN1661) is most likely causing the problem. To identify a switching module
memory board from an address, refer to the appropriate Figures and Tables in
235-600-750, Output Messages Manual, for the "REPT SM HWLVL" and the
"REPT SM HASHSUM" output messages.
3. Determine the status of the affected MCTSI side and its mate side. At an ASM
workstation, cut-through to the Control Display Page, then type and enter: 1190
(a) If the affected side is OOS and the mate side is ACT, proceed to Step 4.
(b) If the affected side is standby (STBY) and the mate side is ACT, using the
REMOVE poke (or RMV input message), remove the affected MCTSI side
from service and proceed to Step 4.
(c) If the affected side is ACT and the mate side is STBY, using the SWITCH
poke (or SW input message), switch the MCTSI, then remove the affected
(now STBY) side and proceed to Step 4.
(d) If the affected side is ACT and the mate side is OOS, take the following
action:
1. Diagnose the mate side and verify it is All Tests Passed (ATP).
2. Using the INH input message, temporarily inhibit hardware (HW) error
checks in the ACT side.
Note: Inhibiting hardware checks may degrade switching module capacity.
3. Using the RST:MCTSI input message with the unconditional (UCL) and
STBY options, request an unconditional restore of the mate (OOS) side
to STBY. Wait for the restore to complete.
4. Using the ALW input message, remove the HW check inhibits
previously activated.
5. Using the SWITCH poke (or SW:MCTSI input message), switch the
MCTSI.
235-200-150
January 2003
CORRECTIVE MAINTENANCE
Procedure 6.5
Issue 3.00 Page 6.5-1
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