IBM 6H0, Service Manual

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Recovery Strategy
The recovery strategy consists of making two calls to establish a remote session. This
solution is the easiest 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, 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 in “Transfer of a Modem Session” on page 509 are conducted
with the remote terminal selected as the primary console to manifest the modem’s
response to DTR transitions.
v
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.
v 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.
v If you choose to use the unused serial port as the primary console, some initialization
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.
510
Service Guide