> > > >---- Original Message ---- >From: b...@iguanasuicide.net >To: debian-user@lists.debian.org >Subject: Re: Testing cat-5 cables with Debian as opposed to cable >tester? >Date: Wed, 22 Apr 2009 10:42:38 -0500 > >>In <880dece00904220507j38722eccq5b39b1d57b000...@mail.gmail.com>, >Dotan >>Cohen wrote: >>>There are cable testing equipment available, for measuring >parameters >>>such as attenuation, crosstalk and others. Can two Debian (or >>>Debian-derived distros) be used to test cables in lieu or expensive >>>testing equipment? >> >>Not normally. Your standard NIC does not have sensors for measuring >such >>things and doesn't expose that information to the OS. >> >>>I have several cat5 cables that have been twisted, >>>bent, stepped on, dragged, rolled over, and worse over the years. >I'd >>>like to know which cables are in need of replacement. >> >>You might be able to estimate the quality of a network cable by >transferring >>random data across it from one Debian host to another and measuring >the >>speed. (Or, probably better, the ratio of (packets dropped because >of >>checksum failure) / (total packets sent)). >>-- >>Boyd Stephen Smith Jr. ,= ,-_-. =. >>b...@iguanasuicide.net ((_/)o o(\_)) >>ICQ: 514984 YM/AIM: DaTwinkDaddy `-'(. .)`-' >>http://iguanasuicide.net/ \_/ >> The problem with trying to determine the quality of the cable based on error measurements is that many if not most of the errors are due to factors (e.g. external induced noise) that do not depend on the cable quality. IMO cable quality is best measured with instruments designed for that purpose. Larry >>
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