Basic AIX Print Queue Questions

Morning, All

I've been doing some work on AIX print queues, troubleshooting some underlying issues we've been having. In the process of this I've uncovered some potential gaps in our knowledge. Our typical setup is remote impact printers (In this case OKIML5520s, with NICs) and local queues and devices set up like this (scripted setup so they're all essentially the same);

0020pa01:
device = @0020pa01
up = TRUE
host = 0020pa01
s_statfilter = /usr/lib/lpd/bsdshort
l_statfilter = /usr/lib/lpd/bsdlong
rq = lp
@0020pa01:
backend = /usr/lib/lpd/rembak -T7200

Our belief was that by passing the option '-T7200' to rembak this would mean the queue would stay UP for 5 days in the event of problems with the remote device. Reading the man page for rembak it seems this assumption may have been a little wide of the mark.... Further tests have proved this to be incorrect.

So, my question is, in this instance, what is causing the print queues to go down? Obviously this causes us lots of problems, generating help-desk calls etc.

Many thanks,

Alex