Nortel Meridian 1 Replacement Manual page 75

Replacing the IOP and the CMDU with the IOP/CMDU in a
redundant system option
Note: In redundant system Options 61C and 81C, the normal procedure
is to replace the faulty IOP and CMDU on the inactive Core to allow
uninterrupted call processing by the active Core. The Core that is
processing calls is defined as active and the Core not processing calls is
defined as inactive.
1 Identify the faulty IOP or CMDU in the system and check if the faulty
unit is in the active or inactive Core by checking the status of both CPUs:
LD 135
STAT CPU
If CPU 0 is active and the faulty IOP or CMDU is associated with
inactive CPU 1, proceed with step 2. If CPU 0 is active and the faulty IOP
or CMDU is associated with CPU 0, perform switchover to make CPU1
the active CPU.
Perform switchover and check the CPU status:
SCPU
STAT CPU
****
Verify that the switchover to CPU1 was successful and that CPU 0 is now
inactive.
2 Verify that disk drives in two Cores are synchronized:
LD 137
STAT
If disk drives are synchronized, proceed with step 3. If they are not
synchronized, execute the SYNC command:
SYNC
****
Replacing equipment
to load the program
to check CPUs status
to perform switchover to CPU 1
to check CPUs status
to exit the program
to load the program
to get the status of the two disk drives
to synchronize the drives
to exit the program
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Hardware replacement