Tell me more ×
Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.
up vote 3 down vote favorite

Nowadays, I usually make EIA/TIA-568A crossover cables for Fast Ethernet(10/100 Mbps) networks. On these cables, just 2 of the 4 wire pairs are used to comunications(the 2 remaining could be used for PoE or just for nothing), so I just needed to cross 2 color pairs(1-2 and 3-6 wires). However, on Gigabit Ethernet all the 4 wire pairs are used to increase the network bandwidth. So, to do a crossover on a Gigabit Ethernet I would need to cross all the 4 pairs. Is this feasible and reliable? I mean, how to make that and what is the correct color order of both ends of a Gigabit Ethernet crossover cable?

share|improve this question
3  
nowadays there is no need for such cables. You can use standard cable which supports 1Gbit (5E and upper) – bakytn Apr 9 '12 at 19:18
Just to be sure, you are running 1000BASE-T ? That's about 98% of hardware, but if you happen to be linking 1000BASE-TX the cross-over is the same as 100BASE-TX. – OCDtech Jan 14 at 23:03

3 Answers

up vote 10 down vote accepted

Wikipedia has pinouts for a gigabit crossover cable.

Note that while Auto-MDIX is an optional feature of the gigabit ethernet specification (IEEE 802.3-2008: "Implementation of an automatic MDI/MDI-X configuration is optional for 1000BASE-T devices"), most gigabit ethernet interfaces do implement it, so in most cases you will not need a special crossover cable.

share|improve this answer
same as 100BASE-T – OCDtech Jan 14 at 23:04
up vote 5 down vote

You don't: Auto MDI-X is built into the Gigabit Ethernet spec. The endpoints will auto-negotiate and take care of those communication issues.

share|improve this answer
So the endpoints will always take care of it by default? – Diogo Apr 9 '12 at 18:44
up vote 0 down vote

One Side will be White,orange-Orange White,green-Blue White,blue-Green White,brown-Brown

Other side will be White,Green-Green White,Orange-Blue White,Blue-Orange White,brown-Brown

(Here White,Orange mean-white with orange stripe)

share|improve this answer
This is a regular crossover cable, and does not apply for gigabit. – Brad Feb 7 at 2:31

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.