Path: utzoo!attcan!uunet!lll-winken!lll-tis!ames!pacbell!att!lzaz!lznv!jlw
From: jlw@lznv.ATT.COM (J.L.WOOD)
Newsgroups: comp.dcom.lans
Subject: Re: Ethernet bridges above 56Kb
Summary: Try ATT ISN
Message-ID: <1413@lznv.ATT.COM>
Date: 21 Jul 88 14:10:23 GMT
References: <9392@dartvax.Dartmouth.EDU>
Organization: AT&T ISL Lincroft NJ USA
Lines: 24

In article <9392@dartvax.Dartmouth.EDU>, finn@eleazar.dartmouth.edu.UUCP writes:
> We will soon have a T1 circuit between two of our sites, but expect to
> be using less than half of its bandwidth.  We would like to bridge
> together two Ethernet networks at these sites.
> 
> All the bridges that I have seen either use an entire T1 circuit, or
> use only 56Kb of it.  Does anyone know of one which can be configured
> for data rates between these limits?
> 
I would recommend that you investigate using ATT's ISN for this purpose.
One if ISN's features is a MAC-layer bridge called Ethernet Bridge.
This can be combined with an ISN packet controller at your base location
and a remote concentrator at your remote location.  In addition you need
to add a device called the Channel Division Multiplexor.  This device will
split up the T1 channel into N voice channels where 1 <= N <= 20 and the
remainder is a single bit synchronous data channel with a V.35 I/F.
This is ideal for the wire trunk card on the ISN which adapts to the
external bit rate and can vary from 9.6Kbps to 2.048Mbps depending
on traffic needs.  As an added bonus you also get STARLAN, synchronous,
asynchronous, Host-Host (UNIX SV or DEC VMS), and 3270 switching
capability at both locations with shared bandwidth with the Ethernet Bridge.
Contact your local ATT Business Office.

Joe Wood
lznv!jlw