IBM H SERIES RS/6000, Installation And Service Manual

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Recovery Strategy
The recovery strategy consists of making two calls to establish a remote session.
This is the easiest solution to implement, and allows more freedom for configuring
your server's serial ports.
To set up a remote terminal session, dial into the Service Processor and start the
system. After the operating system is loaded and initialized, the connection will be
dropped. At this point, you call the server back and the operating system will answer
and offer you the login prompt.
Prevention Strategy
The disconnect is caused by the operating system when it initializes the Primary
Console. The tests listed above are conducted with the remote terminal selected as
the primary console to manifest the modem's response to DTR transitions.
If a local ASCII terminal or a graphics console is to be a permanent part of your
server, then make one of them the primary console. Your remote terminal will no
longer experience the connection loss.
If a local console is not a permanent part of your server, you can still assign either
the unused graphics console or the unused serial port as the primary console. This
gives you the desired seamless connection at your remote terminal.
If you choose to use the unused serial port as the primary console, some initializa-
tion traffic will be sent to any serial device attached to that port. As a result, that
serial device's connection and function could be affected. These impacts may make
that port unattractive for devices other than a temporary local ASCII terminal.
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RS/6000 Enterprise Server Model H Series Installation and Service Guide