Date: Mon, 26 Aug 1996 15:04:11 -0400 From: "Bradley Dunn" <dunn@harborcom.net> To: "Matthew N. Dodd" <winter@jurai.net> Cc: <freebsd-isp@FreeBSD.ORG> Subject: Re: 128k ISDN vs. T1 Message-ID: <199608261912.PAA21209@ns2.harborcom.net>
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Hmmm...Would one be able to bring PRI in over two T1s and use only one of the 48 channels as a D? Or would you still need a backup D on the second T1? What kind of termination equipment is necessary, would a Cisco AS5200 work? Bradley Dunn Harbor Communications ---------- > From: Matthew N. Dodd <winter@jurai.net> > To: Robert Shady <rls@mail.id.net> > Cc: freebsd-isp@FreeBSD.ORG > Subject: Re: 128k ISDN vs. T1 > Date: Monday, August 26, 1996 4:38 AM > > On Sun, 25 Aug 1996, Robert Shady wrote: > > ISDN Primary Rate Interface Service is 23 ISDN B channels, and a single > > ISDN D channel coming in over a single T1. The original post was meant to > > Actually you can do whatever you want to with a PRI. There are pre NI-2 > standards that allow you do do what NFAS does on the DMS and on 5ESS's > running older software. > > So you can have any arbitrary number of B channels delivered over any > number of T1 lines and have Primary and Backup D channels. > > For example, when I add a 3rd PRI, I'm not going to order it with a D > channel. I'll get 24 B's on that line, and I'll use the D channel on one > of my other lines. > > I'm aware of Meridian systems that have a primary and a backup D channel > and 3 to 4 hundred B channels, all delivered over T1s or T3s.
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