home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: comp.dcom.isdn
- Path: sparky!uunet!ukma!bogus.sura.net!darwin.sura.net!cos!cos!bob1
- From: bob1@cos.com (Bob Blackshaw)
- Subject: Re: 23B+D (PBX) & 2B+D (Home)
- Message-ID: <bob1.728231834@cos>
- Organization: Corporation for Open Systems
- References: <C0n63t.GBM@norstan.com> <1993Jan15.170510.12264@atlastele.com> <1993Jan15.234844.14874@atlastele.com>
- Distribution: world
- Date: Thu, 28 Jan 1993 14:37:14 GMT
- Lines: 36
-
- In <1993Jan15.234844.14874@atlastele.com> bcapps@atlastele.com (Brent Capps) writes:
-
- >In a previous article I wrote:
- >>You wouldn't want to make the T1 23B+D to do this -- too many muxing
- >>problems. Instead, you'd want to order the T1 to run ESF/B8ZS, DACS
- >>out the DS0s to _24_ residences as leased lines and drive each DS0
- >>as a BRI OPX on the PBX.
-
- >On second thought this won't work either, a full 2B+D BRI won't fit onto
- >a DS0. If you want your PBX to run the phone like an OPX as you suggest,
- >this becomes a much trickier problem than it appears. First, in your
- >original plan you were using 23B+D to drive 23 * 2B+D, which is a mismatch in
- >both the number of B channels supported and the bandwidth of the D
- >channels (23 * 16K = 368K BRI vs. 64K PRI). That would imply that the
- >CO was performing a switching function between the BRI and PRI channels,
- >so what you've got is not really an OPX.
-
- >Somebody please tell me if I've overlooked something, but the more I think
- >about this, the more it sounds like you would experience a lot of problems
- >letting the PBX provide your "dial tone", as it were. You really need the
- >CO to handle the switching, multiplexing, and concentration issues for you,
- >which is to say that you *can't* run these like OPXs off your PBX.
-
- As I understand the original poster, he wanted 'dialtone' from his
- PBX for regular access purposes, i.e., the homes would be extensions
- of his PBX, could do 4-digit dial to other extensions. etc. I would
- imagine that regular BRI from the CO and some form of numbering plan
- games at the switch would be simpler. Or did I misunderstand?
-
- >--
- >Brent Capps |
- >bcapps@agora.rain.com (gay stuff) | Quis corriget correctores ipsos?
- >bcapps@atlastele.com (telecom stuff) |
-
- Bob.
-
-