From owner-freebsd-isdn  Wed Jan 27 10:43:44 1999
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Message-ID: <36AFCEC4.C8B6E315@est.is>
Date: Wed, 27 Jan 1999 18:43:16 -0800
From: Thordur Ivarsson <totii@est.is>
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To: Archie Cobbs <archie@whistle.com>
CC: "H. Eckert" <ripley@nostromo.in-berlin.de>, freebsd-isdn@FreeBSD.ORG
Subject: Re: I4B support for US ISDN?
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Archie Cobbs wrote:
> 
> H. Eckert writes:
> > Quoting William McVey (wam@sa.fedex.com):
> > > I have Sportster ISDN card (an ISA card which apparently is a passive
> > > ISDN device) inside a FreeBSD 2.2.8 device.
> >
> > Please take a close look and cite the chips' labels.
> 
> Yeah... :-)
> 
> > > All I know is that I connect the ISDN card into the wall via a
> > > standard category 5 cable with RJ45 connectors.  The connection is at
> > > my house and is targetted for residential use.
> >
> > Sounds pretty muche like S0 to me (8pin RJ45 with 4wire cable)
> > but then I've never seen a US style U-interface so far.  What I
> > know of the U-side of things is a 2wire cable that sticks into
> > NTBA.
> 
> If you live in the US and you got an ISDN line from the phone
> company, and didn't purchase any thing else (like a little box
> called an NT1), then you have a U-interface.
> 
> Usually the telco (actually, whoever you hire to do your inside
> wiring) wires up an RJ-45 if it's a new line. But if
> they're reusing and existing twisted pair that already terminates
> at an RJ-11 jack, they might just use that.
> 
> -Archie

I heard rumor here in Iceland that some users connects with U interface
and others with S0 interface.

If you need very many basic rate lines and are willing to use U
interface, you can, then telco does not install NT boxes.

Þórður

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