> Justin Mason wrote:
> > Does anyone know which (if any) of the Irish ISPs support
> this? It's the
> > "always-on" support for ISDN which uses the D channel for
> > signalling, so you can bring up the ISDN line when an
> external user hits
> > your line.
>> Doeas that mean the D channel stays open at all times? If yes
> then it's
> more than unlikely as PRA's come with only 2 D channels (per 30 B
> channels) and they're needed for call setup.
D channel is always connected in both PRA and BRA.
Both PRA and BRA only have 1 D channel although
PRA has a BW of 64K as opposed to 16K for BRA.
The "always-on" feature makes use of the fact
that the D channel is always connected and
runs data services over it (in another virtual circuit).
This could be useful for sending/receiving email
Anyway special equipment is needed in the exchanges
to support this and therefore is not simple to
I don't know of anyone in Ireland that supports the
service and have only heard of it in America.
For details see PC mag june 1998 (I think).
Maintained by the ILUG website team. The aim of Linux.ie is to
support and help commercial and private users of Linux in Ireland. You can
display ILUG news in your own webpages, read backend
information to find out how. Networking services kindly provided by HEAnet, server kindly donated by
Dell. Linux is a trademark of Linus Torvalds,
used with permission. No penguins were harmed in the production or maintenance
of this highly praised website. Looking for the
Indian Linux Users' Group? Try here. If you've read all this and aren't a lawyer: you should be!