Jack PC Hardware User Manual - Training Department

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6.2LAN wiring color coding

In general wire colors are not critical for proper operation as long as wires are connected correctly. There are two wiring codes commonly in use - TIA-568Aand TIA-568B. They only differs by the wires color coding as shown in the figure bellow.

It is important to note that A and B cables are identical, the only difference between them is how their wires were connected at the ends.

Pin Numbering

TIA/EIA 568A

TIA/EIA 568B

(tab down)

Figure 6.2 - TIA-568A and B wiring color coding

Typically site cabling is done according to one of these two conventions although other options are possible (see next paragraph for non-standard cabling).

Some wiring tips:

∙The text printed on the cable may be very confusing. Avoid referring it at all.

∙If you are doing a new installation and you want to confirm which color convention used for a particular cable, the best option is to look at the far end of that cable. At the far end you will either have an RJ-45 plug or IDC wiring to the patch panel. Luckily the RJ-45 jacks are transparent and you will be able to see the wires' colors. Holding the RJ-45 plug with its tab facing away from you and contacts facing up according to Figure 6.2 – check wire color from left (pin 1) to right. If you see the combination on the left side then you have 568A if you see the combination on the right side – then it is 568B. If you see something different – you have a non standard wiring – go to the next paragraph for non- standard cabling.

∙If the cable far end connected to a patch panel – check the colors and compare them with the markings. Typically patch panels provides the two options (A and B) with color markings.

∙In any case do not trust the marking on the cables as same colors may be assembled differently and therefore you should not rely on cable markings. Check wiring before assembly. Color coding may also vary between cable to cable in one site.

∙If you cut / remove existing LAN jack – check the wiring before you cut and mark it on the cable (A / B).

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Chip PC CDC01927 manual LAN wiring color coding, TIA/EIA 568A TIA/EIA 568B
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CDC01927 specifications

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