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Port Switching Printer Sharing
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NOTE: PSF/MVS supports two other methods of printer sharing, which
are not applicable to IBM 6400 printers. VTAM RELREQ is
available for printer sharing under SNA. Port switching is
available for SNA- and TCP/IP-attached printers when a printer
can support multiple active ports.
Port Switching Printer Sharing
To support printer sharing, IBM 6400 printers automatically switch among
all attached ports (serial port, the twinax or coax port, or the Ethernet
network port). Basically, the printer prints jobs for one port until no new
jobs appear and the port “times out”. The printer then switches to the next
port and does the same thing.
To change the default “time out” value for a port, update the TIMEOUT
value for the port on the appropriate menu (Serial Interface, Ethernet,
Twinax Interface, or Coax Interface).
Handling MVS Connectivity Problems
If you encounter problems when “
ping
”-ing a network printer from MVS,
here is how to resolve them.
Ping is Not Successful
If the “
ping
” is not successful, verify the following:
• The printer is powered on.
• The IP address is unique in the TCP/IP network.
If the IP address of the MVS system is not unique, see your network
administrator to resolve the IP address problem.
• The Maximum Transmission Unit (MTU) size of the IP packet for the
MVS system is equal to the MTU size of the printer. For information
about the values recommended for the MVS system, see “Modify the
TCP/IP Profile in MVS” on page 137.
To change the MTU size for the MVS system, change the GATEWAY
statement in the MVS TCP/IP profile, and restart TCP/IP to pick up
the changes.