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- Newsgroups: comp.dcom.isdn
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!darwin.sura.net!cos!cos!bob1
- From: bob1@cos.com (Bob Blackshaw)
- Subject: Re: The ISDN network
- Message-ID: <bob1.724343892@cos>
- Organization: Corporation for Open Systems
- References: <5ce56aee.1bc5b@pisa.citi.umich.edu> <724096126snx@crynwr.com>
- Date: Mon, 14 Dec 1992 14:38:12 GMT
- Lines: 33
-
- In <724096126snx@crynwr.com> nelson@crynwr.com (Russell Nelson) writes:
-
- >In article <5ce56aee.1bc5b@pisa.citi.umich.edu> Jim.Rees@umich.edu writes:
-
- > In article <1992Dec10.235056.27621@spectrum.CMC.COM>, lars@spectrum.CMC.COM (Lars Poulsen) writes:
-
- > If the straight digital asynch TA is $600 and a V.32bis modem is $400,
- > a combined modem/TA should cost $800. When the digital TA is $100
- > and the V32bis modem is $200, the combined modem/TA might still cost
- > $250.
-
- > Given equal production volumes, the digital modem should be cheaper than the
- > analog one, since it doesn't have to deal with nasty analog phone line
- > issues like ring voltage and electrical isolation, and it doesn't need a
- > hybrid or a codec.
-
- >Ha! What do you think your NT-1 is doing? Those local loops are
- >pretty nasty. Yes, you're paying for the functionality, you just get
- >to use it for both B channels at once.
-
- Well, actually, your NT1 is decoding the 2B1Q line code and providing
- some maintenance functions. The telco is under no requirement to send
- CO battery or ringing current to the NT1. Since ISDN may some day be
- running over fiber, they eliminated the requirement for office battery.
- (Something to do with the difficulty of pushing 48V DC down a bit of
- glass, I think).
-
- >-russ <nelson@crynwr.com> What canst *thou* say?
- >Crynwr Software Crynwr Software sells packet driver support.
- >11 Grant St. 315-268-1925 Voice | LPF member - ask me about
- >Potsdam, NY 13676 315-268-9201 FAX | the harm software patents do.
-
- Bob.
-