Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!purdue!tut.cis.ohio-state.edu!ucbvax!proteon.com!tvm
From: tvm@proteon.com (Tom Miceli)
Newsgroups: comp.sys.proteon
Subject: COM-4 Boards
Message-ID: <8905171206.AA11760@monk.proteon.com>
Date: 17 May 89 12:06:10 GMT
References: <8905152110.AA17135@devvax.TN.CORNELL.EDU>
Sender: daemon@ucbvax.BERKELEY.EDU
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All the p4200 expects of the PBX is to receive two clocks (transmit
and receive), and that data be passed unaltered.

Be sure that the PBX is not trying to understand, compress,
re-packetize, or interpret the data.  Sure, the framing is HDLC/SLDC
(only difference is that SLDC requires length to be a multiple of 8
bits), but the contents are not.  If there is a configuration option,
you should be very suspicious that the PBX is trying to be a packet
switch, rather than a pipe.  (The advantage of the packet switch
approach is that bandwidth is not used constantly on the PBX trunk
circuits.)  Of course, it is free to use the capacity while the p4200
is just sending idles between packets.