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- Path: sparky!uunet!biosci!agate!ames!sun-barr!decwrl!pa.dec.com!vixie
- From: vixie@pa.dec.com (Paul A Vixie)
- Newsgroups: ba.internet
- Subject: Re: ISDN Is Coming
- Message-ID: <VIXIE.93Jan24130132@cognition.pa.dec.com>
- Date: 24 Jan 93 21:01:32 GMT
- References: <1993Jan22.184217.8922@netcom.com>
- Followup-To: ba.internet
- Distribution: ba
- Organization: DEC Network Software Lab
- Lines: 36
- NNTP-Posting-Host: cognition.pa.dec.com
- In-reply-to: pascal@netcom.com's message of Fri, 22 Jan 1993 18:42:17 GMT
-
- >Interestingly enough, not a whole lot was said about ISDN at InterOp, at least
- >on the trade floor, and ethernet and FDDI were the big players. This, too, is
- >expected to change ...
-
- ISDN has been vaporware for so long now that folks who were waiting for it
- have mostly moved to other technology (56K ADN and other things that you can
- get "now"). It used to be that you could only get ISDN if you were near the
- Palo Alto South or Redwood City central offices, and that even if so connected,
- you could only make ISDN calls to other ISDN circuits at the same central
- office -- thus I could not call Palo Alto from Redwood City; I could only
- call Redwood City from Redwood City. Pac Bell was willing to sell me a T1
- circuit from Redwood City to Palo Alto if I wanted to make such ISDN calls,
- but they were not willing to pay for such a link themselves since their billing
- system and corporate politics just wouldn't support it.
-
- That's all changing. The Palo Alto/Hamilton Ave central office now has ISDN,
- and Pac Bell has installed their own inter-CO T1 lines to support inter-CO
- traffic. It is now possible to make a call between Redwood City, Palo Alto
- South, Palo Alto/Hamilton Avenue, Moutain View, and Sunnyvale. Their billing
- system seems to be able to handle ISDN lines now. Life may be getting better.
-
- Note, though, that ISDN is a technological nightmare. The specification for
- it is as big as that for ADA or X.400; it has most of X.25 built into it; there
- are chips for framing it but the protocol-level support takes most of a megabit
- ROM chip. In other words, this thing is a real turkey. It's better than 9600
- or even 14400 analog lines, as Richard points out; however, products that can
- deal with the complexity of this protocol are going to be: (1) expensive, (2)
- slow to market, and (3) buggy.
-
- If you are looking for a short-term medium-speed solution, get 56K ADN. ISDN
- is coming, but it's not here yet.
- --
- Paul Vixie, DEC Network Systems Lab
- Palo Alto, California, USA "Don't be a rebel, or a conformist;
- <vixie@pa.dec.com> decwrl!vixie they're the same thing, anyway. Find
- <paul@vix.com> vixie!paul your own path, and stay on it." -me
-