home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: comp.dcom.isdn
- Path: sparky!uunet!usc!sdd.hp.com!caen!deccrl!news.crl.dec.com!news!nntpd.lkg.dec.com!carafe.enet.dec.com!goldstein
- From: goldstein@carafe.enet.dec.com (Fred R. Goldstein)
- Subject: Re: bri lengths
- Message-ID: <1992Nov22.055122.19365@nntpd.lkg.dec.com>
- Sender: usenet@nntpd.lkg.dec.com (USENET News System)
- Organization: Digital Equipment Corp., Littleton MA USA
- Distribution: comp
- Date: Sun, 22 Nov 1992 05:49:28 GMT
- Lines: 28
-
-
- 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? Just for fun, let's say my local telco
- >wants to supply ISDN to all who ask for it. If I want a BRI
- >to my house, and the CO is 10 kilometers away, how does it
- >happen? Is there another interface that's good for longer
- >distances, or does the telco have to plant repeaters all
- >over the place?
-
- A ha, a fellow New Englander! We seem to be plagued by long loops.
-
- ISDN was designed for the worldwide market, where 18 kf (about
- 6 km) seemed adequate, as it picked up over 90% of loops. But
- not necessarily in New England. In many areas, including many
- parts of the USA, the telephone company normally runs T-carrier
- to the neighborhood, and then ha a pedestal-mounted mux. AT&T's
- SLC-96 is a common version. These can be upgraded to ISDN.
-
- But if you're in an area served by long loops (say, almost all
- of Lincoln, MA, for instance, among other places), then you're
- stuck. Either the phone company puts in a repeater (over $1k
- apiece, so don't hold your breath) or you don't get BRI. Sorry.
- ---
- Fred R. Goldstein goldstein@carafe.tay2.dec.com
- k1io or goldstein@delni.enet.dec.com voice:+1 508 952 3274
- Standard Disclaimer: Opinions are mine alone; sharing requires permission.
-