NetNews Usenet Archive 1992 #20/NN_1992_20.iso/spool/comp/dcom/modems/13403

Internet Message Format | 1992-09-14 | 1.7 KB

Path: sparky!uunet!gatech!purdue!yuma!csn!boulder!aurora.Colorado.EDU!cary
From: [e-mail] (John R. Cary)
Newsgroups: comp.dcom.modems
Subject: Modem failure to negotiate through campus switches
Message-ID: <[e-mail]>
Date: 15 Sep 92 05:12:08 GMT
Sender: [e-mail] (The Daily Planet)
Organization: University of Colorado, Boulder
Lines: 29

I have recently purchased two TwinCom 14400 (v.32bis, v.42bis) modems, one
to use on my Mac II at home through Versaterm and System 7, the other
attached to an IBM RS6000/220 running AIX3.2 at work.  Both system
are set to run rts/cts.

I have continually had problems making the connection.  Roughly 1/4 of the
time the two modems find the proper protocol (after the second tone) and
begin communicating at 14400 bps.  The rest of the time they beep
at each other until they give up and disconnect.

My home modem has no problem connecting to a US Robotics on another line.
When I am on campus (inside the phone switches) I have no problem makeing
the modem to modem connection with these same two modems.

So I am beginning to suspect the phone line onto the campus..  The response
of our wonderful Telecom Department was to call up the line, say "Can
you hear me?"  After hearing yes, he said, "All we guarantee is voice
communication."

My question: How can I check for data quality?  What other mysteries
of phone technology might be interfering with my modems?

Thanks...John Cary
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John R. Cary                                  [e-mail]
Department of Astrophysical, Planetary and Atmospheric Sciences
University of Colorado, Boulder, CO 80309-0391
ph. [phone]                                   fax [phone]