From: dburr@sbphy.physics.ucsb.edu (Donald Burr)
Newsgroups: comp.dcom.modems,comp.unix.ultrix
Subject: Setting up a Zoom V.32 on DECstation 5000/200 using ULTRIX 4.2
Date: 13 Aug 92 01:49:52 GMT
Followup-To: comp.dcom.modems

Well, the site where I work, Santa Barbara City College, just got a nice
shiny new Zoom V.32 modem (Note this is NOT the V.32 Turbo; it does NOT
do 12,000 BPS using V.32bis, just straight 9600/V.32)  I am having an
interesting time, however, hooking it up to our DECstation 5000/200
running Ultrix.

First of all, how do you set up a modem as a dial-in port?  Right now
what I am doing is doing ATS0=1, and turning off command echo (ATQ1,
ATV0, I think) and letting the modem do the answering, and just running
a "dumb" getty on that port.  Is there a better way?  Perhaps one that
can send initialization strings to the modem, and wait for a "CONNECT
xxx" message so it can do auto-bauding?  if so, how can I do this, and
where is the source code (if it is a program)

Now, does the ULTRIX tty ports support Hardware Flow Control (HFC)?
This would be a definite advantage, because a lot of our users do file
transfering (both from them -> to the workstation, and to them <- from
the workstation) and blasting data at 19.2k baud (we have our port
locked at that speed) can tend to over-run modem and serial port
buffers.  If HFC is supported, how do I enable it?  (is it a
hardware-only fix, or is it involve both hardware and software)

Now my real reason for posting to comp.dcom.modems:  Our lines are on a
main switchboard.  Consequently, I believe they have a strange ringing
pattern (two short rings, close together, rather than one long ring)
However, I don't think the modem can recognize this.  The reason why is
that the modem does not answer!  Well, it does not answer most of the
time -- it just sits there for 5 or 6 rings, or even 8, before I finally
give up in disgust and disconnect.  On rare instances, however, I HAVE
been able to connect -- sometimes after the first ring, or sometimes
after 3-4 rings.  This is, IMHO, a problem with either the Zoom modem
specifically, or a problem with our phone line.  I am thinking it is a
problem with our phone line, because I have a Zoom V.32 Turbo here at
home, and it is on a residential (i.e. single) line, and it recognizes a
ring right away, and answers right away.  also, we used to have an older
modem (Practical Peripherals 2400 baud, dumb modem) running on this same
phone line, and it answered right away as well.

My thoughts are that either the double-ring is confusing the hell out of
the modem, or the ring signal is not "strong enough", and the modem is
not recognizing it unless it repeats several dozen times.

My question: Is there any way to fix/remedy this?  Like increasing the
modem's sensitivity?  Basically, anything short of getting a new phone
line/number.

Anyway, thanks so very much for all your help!  The Net is indeed a
useful resource.

Please send replies via E-MAIL to dburr@sbphy.physics.ucsb.edu.  I
regrettably don't read these groups very much, and if you replied by
posting, they would probably scroll off our local site before I had a
chance to read them. :-(

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