[ILUG] ISDN D channel.

[Brady, Padraig]

Depends on what your ISDN provider provides.
Some countries allow you to make a "D channel call"
where you can send any info you want @ 16Kbp/s,
and so would be ideal for checking email etc.
This can be free or charged at a specific rate.
I think some of the providers in the states do
this (and call it "always on" or something).
I don't know do Eircom provide for D channel
calls, though could find out from http://www.eircomlab.com/ISDN.htm
and the relevant www.etsi.org standards.
Note if they did then the ISP would have to support
what ever you were transfering (probably IP over PPP?),
and extracting from the D channel (their ISDN equipment
would have to support this).
Or of course you could get you own specialised ISDN
equipment of you had control over what happens at both sides
of the connection you want to make. There is loads of
this stuff around.
Note since this is all digital and because the switches
don't have to make any new connections, a D channel
call is VERY quick to initiate (usually < 1 second).

Padraig.

> -----Original Message-----
> From: John Ronan [mailto:j0n at tssg.wit.ie]
> Sent: 29 April 2000 02:49
> To: ilug at linux.ie
> Subject: [ILUG] ISDN D channel.
> 
> Just wondering, has anyone managed to transfer Data over the 
> ISDN "D" channel?  I'd be interested to hear any reports... 
> 
> John