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From: sterba@inria.inria.fr (Milan Sterba)
Newsgroups: comp.dcom.sys.cisco
Subject: Re: cisco/isdn
Keywords: isdn
Message-ID: <1903@inria.inria.fr>
Date: 7 Dec 90 17:45:59 GMT
Organization: INRIA, Rocquencourt, France.
Lines: 55



We (INRIA Rocquencourt, the CEDIA Passerelles project group, lead by
Yves Devillers) cooperate with cisco on some ISDN - cisco attachment
solution. For that purpose we use the MATRA Terminal adaptators S0/V24.

This adaptators have one S0 port and two V24 ports. One of the V24 ports
is used as auxiliary for configuration and dial-up purposes. The second
one can be used in various configurable fashions. To attach a cisco box
to it we configure it as a synchronous 64 K port. The aim is to utilize
the full capacity of a ISDN/B channel for cisco-to-cisco communication.


                                         ------------------
         --------                       |                  |
        |        | V/24 ---(aux-port)---|cisco aux-port    |
  +- S0 |Matra TA|                      |                  |
  |     |        | V/24 -{"B-channel"}--|cisco serial port |
  |      --------                       |                  |
  |                                      ------------------
 ISDN network
  |                                      ------------------
  |      --------                       |                  |
  |     |        | V/24 ---(aux-port)---|cisco aux-port    |
  +- S0 |Matra TA|                      |                  |
        |        | V/24 -{"B-channel"}--|cisco serial port |
         --------                       |                  |
                                         ------------------



This solution makes it possible to interconnect two cisco boxes using
the ISDN B-channel (64 kbit) using either hdlc, lapb or x25 encapsulation.

The dialing can be made in two fashions.  The first consists in using
the auxiliary port (b-port) of the cisco box connected to the auxiliary
port of the Matra adaptator to dial using Hayes or V25bis mode (both
supported by the Matra box). You can access the b-port by telnet-ing
the port 2001 of the cisco.

The second solution uses the 108/2 mode for dialing. In this latter
case the Matra box dials-up a preconfigured ISDN number when the DTR
signal goes up on the main V24 (64 kbit/s) interface. The control of
the DTR is possible using the "[no] shutdown" command in the cisco
configuration mode.

-----------------

We even have experimented with the ISDN board supplied by Sony for
their NEWS work stations (we have got one from Sony for beta-tests).
The Sony ISDN equipment can be IP-interconnected with the above cisco
ISDN solution using lapb-dce encapsulation.
-- 
--Milan Sterba-- (INRIA Rocquencourt)
sterba@inria.fr