[X4U] Network Cables and Speed

[Doug McNutt]

At 18:09 -0700 4/8/08, Daly Jessup wrote:
>BUT... To enable 1000BASE-T to actually happen, the cable must be wired for all 4 pairs.

>How do you know if the cable you are buying is wired for all four?

Start by looking at it.  There are eight possible wires and the connector is transparent plastic with color-coded wires. A pocket magnifier helps..

Connections to pins 1,2,3 and 6 implies a four wire cable - NG for gigabit.

Connections to pins 1,2,3,4,5,6,7,8  implies an eight wire cable - Probably OK but 3 and 6 need to be a twisted pair.

Connections to 3,4,5,6 or just 4 and 5 implies a telephone cable that simply won't work for anything in the ether.

Connections of pins 1,2 to 3,6 and 3,6 to 1,2 implies a crossover cable for 10 base T or perhaps 100 baseT.

And. . . If anyone knows absolute documented truth about what a 100 base T or 1000 base T crossover cable looks like I'd like a link to the reference.

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