Re: [TCLUG:16725] Linux with ISDN

[Adam Maloney <adam@iexposure.com>]

The NT-1 goes onto the telco side of the modem and allows you to connect
to the ISDN network.  ISDN routers usually come with these but modems
usually don't.  If you have an ISDN BRI U interface then you have the
NT-1, but if you have a BRI S/T interface then you need an NT-1.

The external i-modem uses a regular serial port, so unless you get
something like a fancy high-speed serial port you won't be able to get
more than 115k from it (although ISDN will probably still operate at
128).  Not sure about the internals, never used em.  You can get
high-speed serial (like Rocketport, I think) that will do more than 115k
over a serial port interface.

Subba Rao wrote:
> 
> On  0, Adam Maloney <adam@iexposure.com> wrote:
> > If you get a Pipeline or 3com ISDN TA you won't need to really do
> > anything except setup the network.  If you get a Courier I-Modem
> > (drool!  Lots of blinkies, very pretty) you should just have to set it
> > up like a normal modem (you'll also need an NT-1).
> >
> > If you go with an ISDM modem, you need to setup PPP and all that jazz
> > like a dial-up account.  If you go with an ISDN router, you just plug it
> > into your network and it can masq your machines on it's own.
> >
> 
> Thanks for replying. What is NT-1? Does Courier I-Modem have Linux dirvers?
> 
> On the I-Modem web page, they tout very high speeds like 230Kbps and 512Kbps.
> Does this speed require another serial-card?
> 
> --
> 
> Subba Rao
> subb3@attglobal.net
> http://pws.prserv.net/truemax/
> 
>  => Time is relative. Here is a new way to look at time. <=
> http://www.smcinnovations.com
> 
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-- 
Adam Maloney
Systems Administrator
Internet Exposure, Inc.