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SEC-CDR (SEC-CDR Link Maintenance)
Issue 4 May 2002 10-1483 555-233-123
SEC-CDR (SEC-CDR Link
Maintenance)
The SEC-CDR (SEC-CDR Link) maintenance strategy is covered in the
PRI-CDR/SEC-CDR (PRI-CDR Link) Maintenance documentation.
SHDW-CIR (Common Shadow
Circuit)
The Common Shadow Circuit is that portion of the Duplication Interface circuit
pack that is responsible for memory shadowing in a High or Critical Reliability
system. All memory writes on the active SPE are detected by the Common
Shadow Circuit on the active Duplication Interface circuit pack through the
Memory Bus (M-BUS—bus used by control complex circuit packs to write/read
memory and to communicate with one another). The write information is then
passed to the Common Shadow Circuit on the Standby Duplication Interface
circuit pack via the ICC which then executes the write to memory. In this way, the
Standby SPE is kept up-to-date with the Active SPE and, as a result, is always
ready to take over for the Active SPE.
Refer to DUPINT (Duplication Interface Circuit Pack) Maintenance documentation
for a detailed description of SPE-to-SPE connectivity and STBY-SPE (Standby
SPE) Maintenance documentation for a description of how the Standby SPE is
maintained.
MO Name (in
Alarm Log)
Alarm
Level Initial Command to Run
Full Name
of MO
PRI-CDR/SEC-CDR MINOR test cdr-link primary/secondary l CDR Link
PRI-CDR/SEC-CDR WARNING test cdr-link primary/secondary CDR Link
MO Name (in
Alarm Log)
Alarm
Level Initial Command to Run Full Name of MO
SHDW-CIR
1
1 Determine the carrier to test via the Port field from the Alarm or Error Log.
MAJOR test duplication 1C sh Common Shadow Circuit