Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!usc!snorkelwacker.mit.edu!ira.uka.de!smurf!urlichs From: urlichs@smurf.sub.org (Matthias Urlichs) Newsgroups: comp.dcom.modems Subject: Re: Noisy phone lines Message-ID: Date: 21 Nov 90 11:07:31 GMT References: <2983@hayes.uucp> <1546@westmark.WESTMARK.COM> <1990Nov20.131818.28875@hayes.ims.alaska.edu> Organization: University of Karlsruhe, FRG Lines: 19 In comp.dcom.modems, article <1990Nov20.131818.28875@hayes.ims.alaska.edu>, floyd@hayes.ims.alaska.edu (Floyd Davidson) writes: < In article <1546@westmark.WESTMARK.COM> dave@westmark.WESTMARK.COM (Dave Levenson) writes: < > < >[...] The big fat cable has individual twisted pairs < >which are all twisted in such as way as to cancel the crosstalk < >which would otherwise be created by induction between them. < < Each pair is twisted. Other than that the only placement or < arrangement done is to make it easy to identifiy which is which. < One other "arrangement" is usually done: each twisted pair has a different number of twists per length, to avoid two pairs being "twisted in sync" which may still allow crosstalk. (Or at least the cables I have are manufactured this way.) -- Matthias Urlichs -- urlichs@smurf.sub.org -- urlichs@smurf.ira.uka.de /(o\ Humboldtstrasse 7 - 7500 Karlsruhe 1 - FRG -- +49+721+621127(0700-2330) \o)/