IBM 3720 Problem Determination Manual page 141

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On the control panel, set the Function Select switch
to Console Link Test.
Function Select
Remote CNSL Function
General Disconnect Start
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Activate the Function Start switch.
Read the progression and results of the Console Link Test on the
hexadecimal display of the control panel.
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Approximately one minute after you have activated
the Function Start switch, 44E is displayed.
If 4 4 E remains more than 20 seconds
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it indicates: TEST OK
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• Remove all wrap plugs from console sockets or
cables. Ignore the hexadecimal codes that may
be displayed when the wrap plugs are removed.
• Reconnect the console cables to the consoles.
• Set the Function Select switch to MOSS IML.
• Activate the Function Start switch.
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3720/3721 Communication Controller Problem Determination Guide