User's Manual

PA D S e r v i c e s
Remote PAD Printer Support (x29printd)
Chapter 6144
Figure 6-5 Remote Printer Support
When x29printd begins execution, it examines the /etc/x25/x29hosts
file for all PAD devices configured with a PAD type printer. For each of
these configured devices, x29printd monitors all print requests sent to
the spooling system (see Appendix B, X.25 Configuration Files and
Examples, for an example of the x29hosts file).
When x29printd detects a print request, it establishes an SVC with the
remote PAD printer specified in the remote X.121 address. x29printd
then transmits the print data to the remote PAD printer, closes the SVC,
and waits for another print request.
System Requirements
Because each printing device requires system resources, HP recommends
that the kernel parameters be set to following values (or greater):
• MAX_PAD_PR – is the number of PAD printers to be configured.
• NPTY – is 60 + MAX_PAD_PR
• MAXURPC – is 50 + (3 x MAX_PAD_PR)
• NPROC – is 20 + ((8 x MAXUSERS) + NGCSP + (6 x MAX_PAD_PR))
PAD
HP 9000
Packet-Switching
Network
X.25
Level III
Pseudo-
terminal
drivers
(PTYs)
Kernel
User Level
BSD Sockets
x29printd
LP Spooler
or other
Spooler
Printer