Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!dali.cs.montana.edu!ogicse!hsdndev!bbn.com!drilex!wrglex!j_prigot
From: j_prigot@wrglex.uucp
Newsgroups: comp.sys.dec
Subject: Re: Which Modems for DEC-Hardware ??
Message-ID: <148.2812de7d@wrglex.uucp>
Date: 22 Apr 91 18:00:45 GMT
References: <2275@netmbx.UUCP>
Organization: W.R. Grace & Co., Lexington, MA
Lines: 46

In article <2275@netmbx.UUCP>, weis@netmbx.UUCP (Dietmar Weis) writes:
> Is there anyone out there, who is experienced with modems connected to
> VAXen under VMS and Ultrix and RISC stations ?
> ( I really hope so, 'cos in Germany there ain't nobody ... ;-)
> 
> I need brand names and recommendations.
> 
> I 've **peinfully** fumbled for a long time now and have discovered, that
> you can't use any modem. But why ?? Nobody could tell me, even no one
> at DEC here in Germany.
> 
> What I've found out, is, in short, that DEC handles the RS232 interface
> in a very specific way, namely DSR:
> 
> With DSR present it waits 30 seconds for CD **and** CTS; if not detected, it
> disconnects. (Security, or what ???)
> 
> So now, I need modem types which can be configured to assert DSR when a ring
> is detected.
> 
> NOBODY in Germany knows of DEC modems, such as df02, df03 etc., even DEC
> doesn't know, but several manuals mention them.
> 
> Which modems are known to work ? I'm interested in V32 and V22bis with MNP5.
> 
> Thank your very much.
> 
> Dietmar
> -- 
> weis@netmbx.UUCP         | Dietmar Weis         DONOP CONSULT GmbH
> Voice: 030/884 28 54-0   |                      Uhlandstrasse 179/180
> Fax:   030/882 55 29     |                      D - 1000 Berlin 12

Based upon what I have seen, just about any modem should be configurable to
your needs. The modem should be set to hangup when DTR is not asserted,
present DSR when "off-hook", and CTS and CARRIER when it receives the carrier
from the other modem. 

Note: this is based upon a VAX 3400/VMS platform. The modem control sequence
may be different on a RISC/Ultrix platform.

Our plant in Maintal currently uses a Telebit T1000 modem from the Bundespost.
I know that they had previously used a "non-approved" V.22bis modem.

-- 
Jonathan M. Prigot      j_prigot@wrglex or ...!{drilex|think}!wrglex!j_prigot