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Path: utzoo!henry
From: henry@utzoo.UUCP (Henry Spencer)
Newsgroups: net.dcom
Subject: Re: Vadic 3451 triple modem: how to choose between VA3400 and Bell212A
Message-ID: <6296@utzoo.UUCP>
Date: Fri, 17-Jan-86 13:11:53 EST
Article-I.D.: utzoo.6296
Posted: Fri Jan 17 13:11:53 1986
Date-Received: Fri, 17-Jan-86 13:11:53 EST
References: <1028@turtlevax.UUCP>
Organization: U of Toronto Zoology
Lines: 21

> Does anyone know how to get a Vadic 3451 to call another modem with
> Bell 212A versus VA3400?  They're both 1200 baud, so the baud rate
> can't be used as a switch.
> 
> It seems that it normally tries to connect with 3451; if the other
> modem is a 212A, it has problems starting up.

It alternates between the two until it sees something it understands.
This sounds a bit dubious but seems to work all right in practice.  For a
couple of years most of utzoo's links to the outside world worked that
way (3451PAs calling sites with 212-only modems).  (I speak in past tense
because we're running 2400PAs now.)  Are you sure you're allowing enough
time for the connection to complete?  The alternation can be a bit slow,
and I believe it tries VA3400 first, so a fast timeout could explain the
problem.  We once had trouble with this on Long Distance calls, where the
completion of the connection took a noticeable amount of time, until we
added a couple of 'k's on the end of the phone number to make the thing
a little more patient.
-- 
				Henry Spencer @ U of Toronto Zoology
				{allegra,ihnp4,linus,decvax}!utzoo!henry