From owner-freebsd-isp Mon Aug 26 12:15:43 1996 Return-Path: owner-isp Received: (from root@localhost) by freefall.freebsd.org (8.7.5/8.7.3) id MAA07181 for isp-outgoing; Mon, 26 Aug 1996 12:15:43 -0700 (PDT) Received: from ns2.harborcom.net (ns2.harborcom.net [206.158.4.4]) by freefall.freebsd.org (8.7.5/8.7.3) with ESMTP id MAA07145 for ; Mon, 26 Aug 1996 12:15:20 -0700 (PDT) Received: from swoosh.dunn.org (swoosh.dunn.org [206.158.7.243]) by ns2.harborcom.net (8.7.4/8.6.12) with ESMTP id PAA21209; Mon, 26 Aug 1996 15:12:38 -0400 (EDT) Message-Id: <199608261912.PAA21209@ns2.harborcom.net> From: "Bradley Dunn" To: "Matthew N. Dodd" Cc: Subject: Re: 128k ISDN vs. T1 Date: Mon, 26 Aug 1996 15:04:11 -0400 X-MSMail-Priority: Normal X-Priority: 3 X-Mailer: Microsoft Internet Mail 4.70.1155 MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: owner-isp@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk 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 > To: Robert Shady > 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.