Recovery Strategy; Prevention Strategy - IBM pSeries 630 6C4 Service Manual

If No, try another &Dn setting for your server's modem. See your modem manual for this information.
The &Dn command appears in three places each in three of the sample modem configuration files, as
follows:
2. Will the server's modem disconnect when the power drops? You can make this observation at the
remote terminal by commanding your server to shut down and power off. (Use the AIX command
shutdown -F.) Watch for the message NO CARRIER on your remote terminal.
If Yes, this is the correct response. The modem is set up correctly.
If No, try another &Dn setting for your server's modem. See your model manual for this information.
The &Dn command appears in three places each in three of the sample modem configuration files.
Only the following sample modem configuration files contain the &Dn command (in three places each):
v modem_f.cfg
v modem_f0.cfg
v modem_f1.cfg
If you are using modem_z.cfg or modem_z0.cfg, you cannot control DTR response. If your remote
terminal does not disconnect after logging off, you must command the remote terminal emulator to
hang up. This then breaks the connection.

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 601 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.
602 Eserver pSeries 630 Model 6C4 and Model 6E4 Service Guide