IBM RS6000 - 7026 - H70, Service Manual

Page: 322 / 358

Note: If you have already set up your serial ports, line speeds, authorizations and
telephone numbers from the Service Processor menus, specify your customized
modem configuration files from the service aid.
If you have not already set up your serial ports, line speeds, authorizations and
telephone numbers from the Service Processor menus, you may set them up with
the service aids while you specify your customized modem configuration files.
To disable Auto-Reliable Mode testing of the remote modem, use the sample modem
configuration file
/usr/share/modems/modem_f.cfg
as a model to modify.
1. Find the necessary command in your modem manual.
2. Copy
/usr/share/modems/modem_f.cfg
to make a new file with the name (for
example) modem_fx.cfg.
3. In modem_fx.cfg, change the line
Send "ATEðT\r"
to
Send "ATcccEðT\r"
where
ccc
is the added command found in your modem manual.
Make this change to the third line of each of the following stanzas:
Ÿ condout
Ÿ condin
Ÿ ripo
4. Save the changes.
Use this new modem configuration file as described at the top of this section.
Xon/Xoff Modems
Some modems of the mid-80's vintage assume software flow control (Xon/Xoff)
between the computer and the modem. Modems with this design send extra
characters during and after the transmitted data. The Service Processor cannot
tolerate these extra characters. If your configuration includes such a modem, your
functional results may be unpredictable.
The sample modem configuration files included in this package do not support these
modems, so custom configuration files would be necessary. Anchor Automation
2400E is an example of such a modem.
Most newer modems do not use this design. It is recommended you use modems of
newer vintage if you experience unexplainable performance problems that may be
due to Xon/Xoff characters.
D-4
Service Guide