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From: qeds@mtuxo.UUCP (e.schulz)
Newsgroups: comp.dcom.modems
Subject: Re: Dedicated Line Modems?
Message-ID: <2721@mtuxo.UUCP>
Date: Thu, 30-Apr-87 12:37:11 EDT
Article-I.D.: mtuxo.2721
Posted: Thu Apr 30 12:37:11 1987
Date-Received: Sat, 2-May-87 11:24:09 EDT
References: <7380@mordor.s1.gov> <1733@kitty.UUCP>
Organization: AT&T Information Systems Labs, Middletown NJ
Lines: 34

Some corrections, clarifications, and additions to article <1733@kitty.UUCP>:

The AT&T DATAPHONE(r) II private-line modems are (currently) synchronous
only.  The 2096A has a built-in 4-port time-division multiplexer and
operates at an aggregate rate of 9600 b/s.  The 2096C is a single-port
(non-multiplexing) 9600 b/s modem primarily for multipoint fast-startup
applications.  The 2096T is a significantly less expensive version of the
2096C for the tributary (polled) locations on a multipoint circuit.  With
a 2096C at the control end and 2096T's at the tributaries, all the DATAPHONE
II diagnostic capabilities are still available remotely.

The 2144A has 6 TDM ports, and operates at 14.4 Kb/s.  Several thousand of
these have been shipped in the past year.

All the DATAPHONE II products (APL modems, DDD modems, DDS DSUs, Switched 56
Kb/s DSUs) can be controlled from their front panels (known as Level 1),
from a Diagnostic Console (Level 2), from a Network Controller (Level 3), or
a System Controller (Level 4).  The increasing levels make it easier to
monitor and control larger networks.

Please call or email me for more technical information.  For prices,
availability, ordering, etc. call your AT&T sales representative.  If in
doubt, try 1-800-247-7000 (smaller businesses) or 1-800-247-1212 (larger).

> from article <1733@kitty.UUCP>:
> 	These modems ain't cheap, but they're good for serious applications
> where reliability is important.

I believe they're cheaper than they used to be, especially the 2024T, 2048T,
and 2096T.  I don't have recent reliability data on hand, but I believe the
numbers would support Larry's statement.
-- 
Ed Schulz, AT&T, Middletown, NJ
(201)957-3899 {at&t}!solar!eds