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PSF/2 AFP Printing Using TCP/IP
Xerox 4500 PS ETH, Inst. & Operator's Guide
141
8. Select Port Number
If the output device is attached to PARALLEL 1 of the print server,
then select TCP/IP port number 5001. The value 5002 may also be
used. The value chosen must match the value defined for the session
in the PrintServer (IPDS)
9. Select OK
10. Select Create
The device created can be used with PSF/2 direct and with PSF/2 DPF
printing methods.
17.2 KEEPALIVE support for OS/2
The TCP/IP components in OS/2 offer network attachment for printers.
However, these TCP/IP components do not always detect connection
failures if a point-to-point session between the OS/2 machine and the
device has failed (e.g. in connection with a printer being abruptly
powered off). This may result in serious problems for IPDS printers in
sessions with PSF/2.
Now, support for the TCP KEEPALIVE facility has been added to the
TCP/IP components of OS/2 to detect all communication failures.
PSF/2 directs TCP to send a KEEPALIVE transmission on a TCP
connection remaining inactive for an extended period. If the
KEEPALIVE transmission is not acknowledged, the TCP assumes that
the connection partner has been lost and subsequently reports a failure
to PSF/2.
The frequency of these transmissions depends on the configuration of
the OS/2 TCP/IP environment. The default for OS/2 is two hours or
more. This, however, can be adjusted. These values apply to all TCP
applications that request KEEPALIVE transmissions.
In the following, you are provided with instructions for using the
KEEPALIVE support facility added to the TCP/IP components for OS/2.