Dascom TallyCom III IBM AS400/iSeries Host Print Set-up Guide - Manual (Page 24)

5 PSF/AIX IPDS Printing Using TCP/IP
This chapter provides details on:
Adding a TCP/IP attached printer
Set up of the KEEPALIVE TCP/IP feature
The basic TCP/IP installation of the PrintServer (IPDS) must be completed before
direct AFP / IPDS from PSF/AIX will be possible.
5.1 Adding TCP/IP attached printer
The port number is defined in the PSF/AIX SMIT Add a TCP/IP-Attached Printer
panel.
1. Enter Printer name
PSF/AIX uses the printer name you specify. Enter a name of up to 8
characters.
2. Enter Internet address
The address in the TCP/IP network where the PrintServer is installed.
Enter a 32-bit dotted decimal notation (e.g. 192.0.2.1).
3. Enter Port number (5001)
The value chosen must match the value defined for the session in the
PrintServer (IPDS). 5001 is the default port number of the first IPDS port
no. in the PrintServer (IPDS).
5.2 KEEPALIVE support for AIX
The TCP/IP components in AIX offer network attachment for printers. However,
these TCP/IP components do not always detect connection failures if a point-to-
point session between the AIX 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/AIX
Now, support for the TCP KEEPALIVE facility has been added to the TCP/IP
components of AIX to detect all communication failures. PSF/AIX 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/AIX
The frequency of these transmissions depends upon the configuration of AIX
TCP/IP environment. The default for AIX is two hours or more. This, however, can
be adjusted. These values apply to all TCP applications that request KEEPALIVE
transmissions.
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