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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?

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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 '13 at 23:03

3 Answers 3

up vote 11 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.

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same as 100BASE-T – OCDtech Jan 14 '13 at 23:04

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.

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So the endpoints will always take care of it by default? – Diogo Apr 9 '12 at 18:44

For gigabit this is the pin layout you want to follow

PIN 1 - PIN 3 PIN 2 - PIN 6 PIN 3 - PIN 1 PIN 6 - PIN 2

So far this is a regular crossover cable. for gigabit use

PIN 4 - PIN 7 PIN 5 - PIN 8 PIN 7 - PIN 4 PIN 8 - PIN 5

For a color graphic guide follow the link below, is basically


enter image description here

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