4: System Control
L1 Console Selection
If the system contains more than one IRU and a serial connection is utilized for the console, the serial cable must be connected to the IRU that is located in the lowest rack and slot position.
The select command shows the current console mode settings:
console input: 001c01 console0
console output: not filtered
The following are common subchannels associated with console communications:
•Subchannel 0A specifies Blade 0, CPU A.
•Subchannel 0C specifies Blade 0 CPU C.
•Subchannel 1A specifies Blade 1, CPU A.
•Subchannel 1C specifies Blade 1, CPU C.
•Subchannel 2A specifies Blade 2, CPU A.
•Subchannel 2C specifies Blade 2, CPU C.
•Subchannel 3A specifies Blade 3, CPU A.
•Subchannel 3C specifies Blade 3, CPU C.
•Subchannel console0 Blade 0 console subchannel.
•Subchannel console1 Blade 1 console subchannel.
The output from the select command:
“console input: 001c01 console0”
shows that the system controller will send input to IRU 001c01 blade 0 and the subchannel to be used is the console subchannel.
During the boot process, there is a window of time in which all processors may be producing output. This output can produce a somewhat jumbled output at the L1.
However, you can filter the console output so that the L1 shows output from only the processor chosen to receive console input. You can turn filtering on and off with the select filter command.
If you attempt to communicate with a IRU that is not responding, a
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