Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!ames!pasteur!ucbvax!NSIPO.NASA.GOV!medin
From: medin@NSIPO.NASA.GOV ("Milo S. Medin", NASA ARC NSI Project Office)
Newsgroups: comp.sys.proteon
Subject: Re: COM-4 Boards
Message-ID: <8905171754.AA00456@cincsac.arc.nasa.gov>
Date: 17 May 89 17:54:55 GMT
References: <8905171206.AA11760@monk.proteon.com>
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 14


Actually, the p4200 is very fussy about modem control signals (as it should
be!), and some PBX's may not support all of the signals it's looking
for.  There is an excellent description of what signals are used in 
the hardware reference manual...   Be sure and check your cable carries
the required signals.  

						thanks,
						   Milo

PS For what it's worth, we ran p4200's over a 19.2 Kb Northern Telecom
digital PBX sync. link, and it worked fine after the PBX was
strapped to deal with the modem control signals it SHOULD have been
producing...