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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:
001c01-L1> select
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 time-out condition results: