SHDW-CIR (Common Shadow Circuit)
Issue 4 May 2002
10-1491555-233-123
FAIL The tested Common Shadow Circuit is experiencing
time-outs while trying to write to the Memory circuit pack
over the M-BUS.
1. Verify that there are the same number of PI (Processor
Interface) circuit packs in each carrier.
2. Verify that there are the same number of NETPKT
(Network Control/Packet Interface) circuit packs in each
carrier.
3. Resolve all other DUPINT (Duplication Interface Circuit
Pack), SHDW-CIR (Common Shadow Circuit), and
PR-MAINT (Maintenance/Tape Processor) alarms
before addressing this problem.
4. Rerun the test. If the test still fails, then the Memory
circuit pack on the tested carrier is defective or the
M-BUS is defective on the Standby carrier. Refer to the
“Repair Procedures for High and Critical Reliability”
section in Chapter 6, ‘‘Reliability Systems: A
Maintenance Aid’’ and replace the Memory circuit pack.
5. Rerun the test.
6. Test the Standby SPE with the test spe-standby short
command, and address all Duplication Interface circuit
pack, Common Shadow Circuit, and Maintenance/Tape
Processor tests that do not pass.
NO
BOARD
The Duplication Interface circuit pack has failed to
handshake with either the active Maintenance/Tape
Processor (in the case of Duplication Interface circuit pack
A) or the Duplication Interface circuit pack A (in the case of
Duplication Interface circuit pack B).
1. Refer to NO BOARD for a description of the Duplication
Interface Circuit Pack Status Query Test (#315) in
DUPINT Maintenance documentation.
PASS Part of the Common Shadow Circuit is operating properly.
However, Tests #283 and #284 must pass before the
Common Shadow Circuit on this Duplication Interface circuit
pack is considered sane.
Table 10-569. TEST #285 Common Shadow Circuit M-BUS Time-Out Query Test
— Continued
Error Code
Tes t
Result Description/Recommendation
Continued on next page
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