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<h1 class="SECT1"><a name="SECNETWORK">11.5. Network Print
Server Boxes</a></h1>
<p>A <i class="EMPHASIS">network print server</i> is usually
a box (external model) or card in a printer (internal model)
which has a network connection to a TCP network and software
to implement a LPD print server. If it is an external model,
The parallel or serial port of the printer is connected to
the box, and the print server may support multiple printers.
If it is an internal model, the server is usually nothing
more than a Network Interface Controller and a ROM containing
software that the microprocessor in the printer uses.</p>
<p>The print server may support multiple printing protocols,
such as <a href="rfc1179.htm">RFC1179</a> (TCP/IP printing
using the LPD print protocol), Novell Printer Protocols, SMB
print protocols, and AppleTalk protocols. One of the observed
problems with Network Print servers is that while they can
usually support one protocol and one user at a time quite
well, when you try to use multiple protocols and/or multiple
users try to transfer print jobs to the printer, the printer
may behave in a very odd manner. Usually this results in a
printer failing to finish a job currently being printed, and
unable to accept new jobs.</p>
<p>Several of the newer models of print servers have Simple
Network Management Protocol (SNMP) agents built into them,
and can provide detailed information about their internal
functions. By using a SNMP manager such as SunNetmanage or
HP-Openview, you can monitor your network printers
activities.</p>
<p>I recommend that you use only a single protocol to send
jobs to the printer. If you can, I also recommend that you
use a print spooler and have only a single host system send a
job to the printer.</p>
<p>My best advice on connecting to network printers is not to
use the the built-in LPD server, but to use the direct TCP/IP
connection to the print engine. Usually this is done to
particular TCP/IP port on the printer. For the HP JetDirect
and other HP products, this is usually TCP port 9100.</p>
<p>Once you have the direct connection, you can now use
various filters to preprocess the print job, insert PJL and
PCL commands, or convert text to PostScript or PCL for better
print quality.</p>
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