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- Newsgroups: comp.dcom.isdn
- Path: sparky!uunet!spool.mu.edu!sol.ctr.columbia.edu!zaphod.mps.ohio-state.edu!uwm.edu!linac!att!cbnewsm!cbnewsl!att-out!cbfsb!cbnewsf.cb.att.com!deej
- From: deej@cbnewsf.cb.att.com (david.g.lewis)
- Subject: Re: bri lengths
- Message-ID: <1992Nov23.141315.3880@cbfsb.cb.att.com>
- Sender: news@cbfsb.cb.att.com
- Organization: AT&T
- References: <1992Nov22.055122.19365@nntpd.lkg.dec.com>
- Date: Mon, 23 Nov 1992 14:13:15 GMT
- Lines: 18
-
- In article <1992Nov22.055122.19365@nntpd.lkg.dec.com> goldstein@carafe.enet.dec.com (Fred R. Goldstein) writes:
- >
- >In article <1992Nov21.2070.618@channel1>, "chris strawser" <chris.strawser@channel1.com> writes...
- >>I understand that the maximum distance an ISDN U-interface can
- >>be run is 6 kilometers. If this is so, how do you run a BRI
- >>over longer distances?
- >
- >ISDN was designed for the worldwide market, where 18 kf (about
- >6 km) seemed adequate, as it picked up over 90% of loops.
-
- Minor correction; the U-interface is a design twist unique to the US market
- (although it can be adopted elsewhere, e.g. Canada, it's only specified in
- American National Standards). The "90% of loops with 18kfeet" is in the US,
- and I would suspect in the RBOCs (since it was a pre-divestiture Bell Labs
- study that suggested the number).
-
- David G Lewis AT&T Bell Laboratories
- david.g.lewis@att.com or !att!goofy!deej Switching & ISDN Implementation
-