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From: Robert M. Riches Jr. on 26 Sep 2007 20:51 On 2007-09-26, Unruh <unruh-spam(a)physics.ubc.ca> wrote: > > A crossover switches 1 and 2 and 3 and 6 from one end to the other. > They sell them in your local shop or if you wire up your own, just reverse > those connections. ( 4,5 7 8 are not used No idea why cat 6 is not 4 wire > rather than 8 wire, but...) 100mb ethernet uses all eight wires, doesn't it? -- Robert Riches spamtrap42(a)verizon.net (Yes, that is one of my email addresses.)
From: Dan C on 26 Sep 2007 21:36 On 2007-09-27, Robert M. Riches Jr. wrote: >> A crossover switches 1 and 2 and 3 and 6 from one end to the other. >> They sell them in your local shop or if you wire up your own, just reverse >> those connections. ( 4,5 7 8 are not used No idea why cat 6 is not 4 wire >> rather than 8 wire, but...) > 100mb ethernet uses all eight wires, doesn't it? Nope. Just 1/2 (Tx) and 3/6 (Rx), as stated above. Here's more info: http://www.incentre.net/incentre/frame/ethernet.html -- "Ubuntu" - an African word meaning "Slackware is too hard for me".
From: Unruh on 26 Sep 2007 23:38 "Robert M. Riches Jr." <spamtrap42(a)verizon.net> writes: >On 2007-09-26, Unruh <unruh-spam(a)physics.ubc.ca> wrote: >> >> A crossover switches 1 and 2 and 3 and 6 from one end to the other. >> They sell them in your local shop or if you wire up your own, just reverse >> those connections. ( 4,5 7 8 are not used No idea why cat 6 is not 4 wire >> rather than 8 wire, but...) >100mb ethernet uses all eight wires, doesn't it? AFAIK no, neither does Gigabit.
From: Christopher Hunter on 27 Sep 2007 01:41 Robert M. Riches Jr. wrote: > On 2007-09-26, Unruh <unruh-spam(a)physics.ubc.ca> wrote: >> >> A crossover switches 1 and 2 and 3 and 6 from one end to the other. >> They sell them in your local shop or if you wire up your own, just >> reverse those connections. ( 4,5 7 8 are not used No idea why cat 6 is >> not 4 wire rather than 8 wire, but...) > > 100mb ethernet uses all eight wires, doesn't it? No. Just 1 & 2 with 3 & 6. It always struck me as silly that people try to push fast digital signals down twisted pair cable - you can get /much/ more bandwidth, cause less interference and have better data integrity using coax. Admittedly it's more expensive, and requires some marginal skill to fit the connectors, but back when coax was the norm, I cabled /lots/ of office networks and /never/ had problems with them. Chris
From: Unruh on 27 Sep 2007 14:20
Christopher Hunter <chrisehunter(a)NOSPAMblueyonder.co.uk> writes: >Robert M. Riches Jr. wrote: >> On 2007-09-26, Unruh <unruh-spam(a)physics.ubc.ca> wrote: >>> >>> A crossover switches 1 and 2 and 3 and 6 from one end to the other. >>> They sell them in your local shop or if you wire up your own, just >>> reverse those connections. ( 4,5 7 8 are not used No idea why cat 6 is >>> not 4 wire rather than 8 wire, but...) >> >> 100mb ethernet uses all eight wires, doesn't it? >No. Just 1 & 2 with 3 & 6. >It always struck me as silly that people try to push fast digital signals >down twisted pair cable - you can get /much/ more bandwidth, cause less >interference and have better data integrity using coax. Admittedly it's >more expensive, and requires some marginal skill to fit the connectors, but >back when coax was the norm, I cabled /lots/ of office networks and /never/ >had problems with them. Actually I doubt that you could push Gigabit signals down a coax. I also find it astonishing that you can push Gigabit down a twisted pair, but it works. >Chris |