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Question about pre-terminated cat6 cables


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#1 #Michael

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Posted 24 July 2013 - 14:29

Cat6 cables that have terminated plugs on them from the factory, are they in the 'a' or 'b' configuration?  I am planning on running some cables for a small networking project and I am thinking of leaving one of the pre-made plugs on and will just need to use wall plates for the other end.  That means I will be using a punch down tool and I need to make sure that I set it up in the right configuration.




#2 Geoffrey B.

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Posted 24 July 2013 - 14:46

B is the most common however, it should not really matter either way unless you are plugging one end into a coupler to connect to another cable for extension.



#3 OP #Michael

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Posted 24 July 2013 - 14:52

B is the most common however, it should not really matter either way unless you are plugging one end into a coupler to connect to another cable for extension.

 

Wouldn't the wall plate be considered a coupler because I would be plugging another cat6 cable into it such as a switch?  But if the pre-made terminator is in the 'b' config then I do just need to make sure that my wall jack is also done that way.



#4 Escape

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Posted 24 July 2013 - 15:03

Yeah, just see what type is already installed and use that standard

#5 OP #Michael

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Posted 24 July 2013 - 15:23

The cat6 cables from monoprice: http://www.monoprice...&seq=1&format=2

 

Are they in a or b configuration?



#6 Geoffrey B.

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Posted 24 July 2013 - 15:25

being as it is not listed i would say it is in configuration B as that is the industry standard.



#7 sc302

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Posted 24 July 2013 - 15:26

Well look at the first two pins. If the first two are orange it is safe to say that it is b. If the first two are green then it is safe to say that it is a.

The b standard goes like this:
Wo,o,wg,bl,wbl,g,wbr,br

The a standard reverses the green and the orange and looks like this:
Wg,g,wo,bl,wbl,o,wbr,br

W=white
G=green
O=orange
Bl=blue
Br=brown

When looking at the cable, the metal pins are facing you vs the clip facing you.

#8 OP #Michael

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Posted 24 July 2013 - 15:29

being as it is not listed i would say it is in configuration B as that is the industry standard.

 

Well look at the first two pins. If the first two are orange it is safe to say that it is b. If the first two are green then it is safe to say that it is a.

The b standard goes like this:
Wo,o,wg,bl,wbl,g,wbr,br

The a standard reverses the green and the orange and looks like this:
Wg,g,wo,bl,wbl,o,wbr,br

W=white
G=green
O=orange
Bl=blue
Br=brown

When looking at the cable, the metal pins are facing you vs the clip facing you.

 

Cool....thanks.  When I start on this small project in a couple of weeks then that should make this very easy and simple.



#9 sinlogik

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Posted 24 July 2013 - 15:49

I just did this at my parents house a couple of months ago and I used the B configuration with no problems.  As others have mentioned, B is the most common used configuration now.



#10 OP #Michael

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Posted 29 July 2013 - 21:40

So just as an update to this.  I was getting this project started over the weekend and figured out that this is not going to work out as intended.  Basically my house is broken down in 2 ways.  The first part (front part of the house) was built in the 50's and has a full basement, of which part of it is finished and the other part isn't.  The second part (family room, bedrooms, etc..)  of the house is an addition that was built onto it about 5-6 years ago and is a partial basement/crawl pace.  So of course the wiring and outlets are different between the two as building codes change as the years go on.  The front part of the house I had no trouble fishing wire pull through the wall as the outlets don't have conduit boxes but just run though the walls.  But the back part of the house is much more involved in that all of the outlets are all conduit boxes and all of the wires run though conduits.  I don't have any spaces really to fish wire pulls through.

 

So, I am thinking of just not doing a physical network layout and going completely wireless.  Thinking of a new ac router and then a network extender in the back of the house.



#11 Shadrack

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Posted 29 July 2013 - 22:00

B is the most common however, it should not really matter either way unless you are plugging one end into a coupler to connect to another cable for extension.

 

Even then, if one cable is configuration B on both ends, and the other cable is configuration A on both ends and there is a couple between the two the signals will still be on the correct pins when you terminate the connection to your ethernet card and switch.



#12 Brian M.

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Posted 30 July 2013 - 11:36

Even then, if one cable is configuration B on both ends, and the other cable is configuration A on both ends and there is a couple between the two the signals will still be on the correct pins when you terminate the connection to your ethernet card and switch.

 

Agreed - I shouldn't think it makes a blind bit of difference unless it's A on one end and B on the other?



#13 sc302

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Posted 30 July 2013 - 11:52

It makes no difference in shadracks post as b on both sides of one and a both sides of another = 2 straight through runs, there is no cross over on any pairs of wire. It is when you have a on one side of 1 wire and b on the other side of that same wire that it becomes a cross over.

1,2,4,5 is your standard 10/100 com pins. In a straight through cable this stays consistent on both ends regardless of a or b standard.

It becomes a cross over when 1,2,4,5 is on one side and 4,5,1,2 is on the other side of the run basically reversing the orange and the green one time in the run.

#14 OP #Michael

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Posted 30 July 2013 - 13:53

It's too bad I won't be using any of this info as it is quite helpful.  Since I am not going to be doing any cable runs anymore I don't have to worry about making sure I get the wires properly terminated.



#15 HawkMan

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Posted 30 July 2013 - 15:20

Mist switches/routers have auto switching if the cable is crossed when it shouldn't be and visa versa as well.

It's too bad I won't be using any of this info as it is quite helpful.  Since I am not going to be doing any cable runs anymore I don't have to worry about making sure I get the wires properly terminated.


I would suggest finding a way to physically wire at least your Tv/stereo area and office/gaming pc area though. While modern wireless networks can stream HD it's best not to, also avoids the streaming disrupting potential gaming activities and such on the wireless. Wireless is great, but not when shared between multiple units using it heavily, like two users streaming HD Netflix, maybe a torrent box, stuff that only needs high BW and then you have someone gaming that barely needs BW but requires low latency but keeps getting pushed to the back of the traffic queue and getting high pings.