By Ola Ormset, bigboy[at]kose[dot]no
To utilize these color codes correctly you should hold your RJ45 connector with the locking thingy away from yourself, and with the little metal contacts facing towards you.
Most CAT5 cable comes with 4 pairs (otherwise, would it be a CAT5 cable?). On the standard, el-cheapo CAT5 from Biltema those pairs have certain color codes. I use them as an example here.
| Pair number | Color | |
|---|---|---|
| 1 | ||
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| 2 | ||
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| 3 | ||
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| 4 | ||
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This is the most common cable, often referred to as a "patch cable". One end goes into your RJ45 compatible network interface, and the other one fits smugly into your switch, HUB or a broadband router.
| Pin number | Color | |
|---|---|---|
| 1 | ||
| 2 |
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| 3 | ||
| 4 | ||
| 5 |
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| 6 |
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| 7 | ||
| 8 |
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Yes, this is indeed possible. Just remember that the plug utilizing pairs 3 and 4 should be plugged into the computer which transfers the least data of the two.
This setup is most commonly used between a hub and a dual connector walljack.
| Plug/walljack number | Pin number | Color | |
|---|---|---|---|
| 1 | 1 | ||
| 2 |
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| 3 | |||
| 4 | |||
| 5 | |||
| 6 |
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| 7 | |||
| 8 | |||
| 2 | 1 | ||
| 2 |
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| 3 | |||
| 4 | |||
| 5 | |||
| 6 |
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| 7 | |||
| 8 | |||