Brian Henning wrote:
Okay, you're wrong. :) 10MBit Ethernet and 100MBit Ethernet both only use 4 conductors (2 pair) for signaling. Gigabit Ethernet, on the other hand, does use all 8 conductors (4 pair) to do signaling. It's truly a different beast from 10/100 Ethernet, although all Gig-E controllers that I'm aware of also have the ability to signal via the older 10/100 method on only the 4 conductors.One thing I can tell you is that the non-working cable has only 4conductors
crimped. For long cables, should all 8 be crimped?
As I understand it, 10-base-T needs 4 conductors (two signal, two ground) and 100-base-T requires all 8 (four signal, four ground).
Someone correct me if I'm wrong!
Cheers, ~Brian
I'm going to toss in a bit more of a rant about 568B color code and punching down all of the conductors here that I somehow neglected to include in my other post to this thread a moment ago. The two big reasons for punching down all of the wires are future compatibility with later standards like Gig-E, and the fact that those other pairs (because they are also twisted with the signal-carrying pairs) can be grounded and serve as "shielding" (note shielding is in quotes because it doesn't work like traditional shielding, but it has a similar net effect). Granted, most cheap equipment these days doesn't actually ground the extra pins on the connectors, but (in my opinion) it's best to ensure that you're cabling isn't the limiting factor in something not working right.
Aaron S. Joyner -- TriLUG mailing list : http://www.trilug.org/mailman/listinfo/trilug TriLUG Organizational FAQ : http://trilug.org/faq/ TriLUG Member Services FAQ : http://members.trilug.org/services_faq/ TriLUG PGP Keyring : http://trilug.org/~chrish/trilug.asc
