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Ethernet cable I am trying to wire an ethernet twisted pair cable used with an 8PC modular plug to the back of an RJ45 flush mounted wall jack. The cable has brown, blue, orange and green wires, each with a white wire twisted around it. The back of the RJ45 has 8 connecting terminals with blue, orange, black, red, green, yellow, brown and white wires.. If the 8 wires in the cable matched the colors on the back of the wall mount I would connect color to color. Where do the twisted white wires go? Thanks, Jack

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568-B Wiring
Pair Wires RJ-45 pins
1-White/Blue White/Blue 5
Blue/White 4
2-Wht./Orange White/Orange 1
Orange White 2
3-White/Green White/Green 3
Green/White 6
4-White/Brown White/Brown 7
Brown/White 8
568-A Wiring
1-White/Blue White/Blue 5
Blue/White 4
2-White/Green White/Green 1
Green/White 2
3-White/Orange White/Orange 3
Orange/White 6
4-White/Brown White/Brown 7
Brown/White 8
RJ-45 Pins are with the spring tab down and read left to right. Do you have an RJ-45 Crimping tool?
Just use 568-B or 568-A on both ends of the same cable.

Posted on Aug 26, 2009

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Wiring on a RCA RJ-45 wall jack

the RJ45 wallplate is not meant for ethernet. It's an 8P8C connector for a phone. Will it work as a network jack? Maybe. I wouldn't use it, but if you really want to try, wire it thusly:

1 Blue --- Orange/White
2 Orange --- Orange
3 Black --- Green/White
4 Red --- Blue
5 Green --- Blue/White
6 Yellow --- Green
7 Brown --- Brown/White
8 White --- Brown

I'd still recommend a CAT5 wallplate with a CAT5 jack.

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if the jack looks weird, then you need some with the tool to punch down the jack.
and get a good cable between the modem and the jack.

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No. just buy a modem and a router in one that can do that kind of option without any hassle.

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Are you looking for cat5 straight through cable or crossover??

option 1 (straight through)
each pin correspond to the other end in the same spot.

If all the cables are colored the same then you need an ohm meter to identify them.

Option 2: (crossover)

Pin 1 correspond to pin 3
Pin 2 correpond to pin 6
Pin 3 to Pin 1
Pin 6 to Pin 2

or you can go to (for schematics):

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Yes you can but depending on the length of the cable, you may not be able to have a connection speed of more than 100 mbps because of the 48V phone line running along the Ethernet link. You have to understand that this is completely outside the structured networks guidelines... but it may be quite useful if you have a lack of cables. So, do that only if you really cannot add another wire without having to destroy you walls or ceilings.

Use the blue and brown pairs for the phone and green and orange pairs for the Internet. Be sure to untwist the pairs as close as possible to the connect point. For that kind of setup, I recommend you to use a BIXed wall plate such as the Belden AX100344 (2 ports) or AX100352 (4 ports).

For the Ethernet outlet, the orange and green wires would go exactly where they should: 3,4,5 and 6.

If you are using a 2 ports plate (AX100344), the blue wires will go into 1,2 and the brown will go into 3,4 of the second outlet. This will make your phone outlet carry the 2 phones lines. Some business phones actually support receiving the two phone lines like this.

If you are using a 4 ports plate (AX100352), exactly as with the 2-port plate, the blue wires will go into 1,2 of the second outlet. Then, the brown wires will go into 3,4 of the third outlet. This way, the second and third outlets will have regular phone lines in which you will be able to plug any kind of domestic phone. Unfortunately, the forth port will remain unused.

This being said, I have explained only how to connect the wall side since I don't know anything about where and how the other end is terminated.

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5 Answers

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I know this is an old thread, but for the sake of helping someone else in the future, I just got off the phone with the Phillips Help Desk and this is the way they told me to wire it up the RJ-11 & RJ-45 combo jack I bought (PH60037):
  • RJ-45
  • Jack colors - CAT 5e
  • Blue - white/orange
  • Orange - Orange
  • Black - white/green
  • Red - Blue
  • Green - white/blue
  • Yellow - Green
  • Brown - white/brown
  • White - brown

  • RJ-11
  • White - white/green
  • Black - white/orange
  • Red - blue
  • Green - blue/white
  • Yellow - orange
  • Blue - green
He said it was the standard configuration used by the phone companies for some time.
Phillips Help Desk # for phones/PCs (800-233-8412)
Hope that helps someone else down the road.


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Describe to me exactly how you are set-up. Include the IP addresses of each device and exactly what ports are being used on each device. Could like an IP mistake or in some cases an X-over cable is still required IF your switch does not have does not have a x-o button on it. But that depends how things are connected. These are the 2 most likely but need the above info to diagnose.


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