Path: utzoo!censor!geac!torsqnt!news-server.csri.toronto.edu!cs.utexas.edu!uunet!munnari.oz.au!csc.anu.oz.au!jatz.aarnet.edu.au!pte900
From: pte900@jatz.aarnet.edu.au (Peter Elford)
Newsgroups: comp.dcom.sys.cisco
Subject: Re: cisco/isdn
Keywords: ISDN cisco
Message-ID: <1990Dec3.111803.3666@csc.anu.oz.au>
Date: 3 Dec 90 00:18:02 GMT
References: <2241@ecrc.de> <1990Nov29.141455.48@cnedcu51.bitnet> <1990Nov29.093347.18579@hellgate.utah.edu>
Reply-To: pte900@jatz.aarnet.edu.au (Peter Elford)
Organization: AARNet
Lines: 33
Nntp-Posting-Host: jatz.aarnet.edu.au

|> In article <2241@ecrc.de>, dave@ecrc.de (Dave Morton) writes:
|> Do Cisco have any plans to provide an ISDN interface for their routers ?

AARNet is about to upgrade the backbone links in our network to ISDN primary
rate services. These links will look like this:

       V.35              G.703                PRA
cisco ------  Nx64K Mux ------- ISDN Adapter ----- ISDN Network --- etc.

The Nx64K Mux is made by Summit Technologies (an Australian company) and
provides a single bitstream out of multiple 64K B channels. For a link of
N 64K streams you need one additional B to do the synchronising (so
128K requires 3 64K circuits). The ISDN adapter is from Jtec (another
Australian company). Within about 3-6 months the Summit box will have
a PRA interface, and Jtec will be offering Nx64K out of their equipment,
so we will only need an interface box from one vendor.

In addition, we are planing to migrate our 48K tail links to ISDN BRA links
(2B+D) and are looking at terminal adpaters that will provide V.35 interfaces
to this service (there are at least two vendors of such equipment in Australia:
Telecom Australia resell the Phillips box, and Datacraft sell the Newbridge).

Down the track a bit we would like to consider dynamic ISDN links (placed by
the router and/or Summit/Jtec box) to bridge link failures or to add
additional capacity (ie. link bandwidth) on demand. This would require some
support from both cisco and Summit/Jtec ...
 
Peter Elford,                           	e-mail: P.Elford@aarnet.edu.au
Network Co-ordinator,	 			phone: +61 6 249 3542
Australian Academic Research Network,		fax: +61 6 247 3425
c/o, Computer Services Centre,			post: PO Box 4
Australian National University			      Canberra 2601
Canberra, AUSTRALIA