On Thu, 5 Feb 2004, Les Mikesell wrote:
> On Thu, 2004-02-05 at 15:01, Julius Szelagiewicz wrote:
> > Dear Folks,
> > I have been experiencing a noticable ( > 3 seconds) delay when I
> > print a job to a printers connected to terminals. The queues are defined
> > as jetdirect and the spooler uses same mechanism for terminal connected
> > and network connected printers. Network connected printers get data right
> > away, terminal connected get it after more than 3 seconds passes. What
> > gives, how can I change it? I like the immediacy of good systems, this
> > just doesn't feel right, and the users are grumbling too. julius
> >
> > p.s. i tested it with a printer connected to a terminal - delay, same
> > printer connected to external hp jetdirect box - no delay.
>
> Just guessing, I'd say that the terminal is collecting the entire job
> into a file in a queue, then sending out the oldest job in the queue.
> That would be a good thing if you had twenty jobs coming at once. The
> Jetdirect box probably only accepts one connection at a time and
> passes it through as received.
>
Les,
you are right, JetDirect *effectively* accepts just one connection
at a time. The standard is published and the way jobs are accepted is a
part of it. JetDirect listens on the selected port (default 9100) and when
the connection gets established, it refuses any connections from other IPs
until there was at least 1 second of idle time. This interval is
considered to signify the end of a job. The acceptance of the first job
does not require any idle time.
julius
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