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149 posts

Master Geek
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Topic # 127378 8-Aug-2013 12:26
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Hi all,

 

This is my first post here but I have been using this site
for quite some time and learnt a lot from the browsing the forums. So first-up,
thanks J

 

I have a question about my existing cat5 wiring at home.
When we bought the house there was a pabx phone system which I am keen to
uninstall. I had a rush of blood to the head & decided to do this myself.
The wiring is in a star configuration with a central krone block, and the cat5
is terminated with rj45 ports.

 

My plan is to replace the krone with an rj45 patch panel and
thereafter patch either phone or data as required (my router is mounted on the
same wall as the krone block).

 

I researched wiring configurations, but it would seem our
terminations are some sort of variation on the t586b standard. The port has a
clear diagram for both 568a & 568b wiring however as you can hopefully see
from the photo, the solid orange wire is at position 1, correlating with the
colour coding on the port (labeled as T568B although the photo is a bit
obscured)

 

As far as I can tellis is different from the guidelines I
found on the interwebs, all of which have white/orange stripe at pin 1 and
orange at pin 2 for t568b.

 

Is there any reason for this, and why would our ports all be
labeled apparently incorrectly?

 

Thanks again.


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149 posts

Master Geek
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Reply # 873797 8-Aug-2013 12:31
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Sorry, I messed up the photo upload 





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  Reply # 873801 8-Aug-2013 12:43
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Every manufacturer lays out the wiring differently as it suits them but the actual pin outs on the module will be the same. That jack is wired with 568b so as long as you wire your patch panel in that configuration it will be fine.
There is no benefit to one or the other but as a general rule in NZ we use 568a.

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  Reply # 873818 8-Aug-2013 13:11
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Hi, yep 568a is the norm, but there is no problem using b, just make sure both ends are wired the same.

May I also suggest that you try not untwist the pairs, untwisting has a significant impact on performance.

Cyril



149 posts

Master Geek
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  Reply # 873845 8-Aug-2013 13:38
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Thanks for the replies.
 
 So, the solid orange wire at pin1 is nothing out of the ordinary? I ran a search before the original post & the results all give orange/white stripe at pin 1 for 568b. I can just as easily match the other end at my panel, but if it is out of step with convention I could re-do all the jacks to avoid future confusion if necessary. Excuse my caution, but I'm trying to avoid spousal gloating here (she would prefer me to get a man in....)
 
@Cyril, I read your posts about avoiding untwisting the wires if possible. Would it be worth re-doing the one in this photo?
 
Much appreciation :)

 

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  Reply # 873852 8-Aug-2013 13:44
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Hi, firstly wire the jack as per the manufactures diagram, it will ensure you get the correct wiring the actual layout depends on how they layed out the PCB, so just follow it, if you go to re terminate, then I recommend you change to A to be compliant.

I recommend you reterminate them (if this one is anything to go by) you should not do any untwist, preferably add half a twist if you must to help align the wires with the IDC. If you are careful you should be able to split the pair with your finger nail (or over the IDC seperator) and get the wires to just fit without untwisting.

Cyril



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  Reply # 873903 8-Aug-2013 14:48
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Actually, very good points; I had been assuming that position 1 on the wiring diagram corresponded to pin one at the port….... Very embarrassing
first post!

Nonetheless, a switch to 568a would probably be a good idea and at the same time I’ll avoid any untwisting of the wires. Thanks for the help.


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  Reply # 874277 8-Aug-2013 22:15
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cyril7: Hi, firstly wire the jack as per the manufactures diagram, it will ensure you get the correct wiring the actual layout depends on how they layed out the PCB, so just follow it, if you go to re terminate, then I recommend you change to A to be compliant.

I recommend you reterminate them (if this one is anything to go by) you should not do any untwist, preferably add half a twist if you must to help align the wires with the IDC. If you are careful you should be able to split the pair with your finger nail (or over the IDC seperator) and get the wires to just fit without untwisting.

Cyril


You can untwist them by maximum 6mm and strip 25mm of jacket for the Cat6 standard, and Cat5e allows slightly more than that. The orange pair seems to be split the same as the plug pinouts so will need to be untwisted a bit. FYI in T568A the 1st pair (blue) in the cable is terminated on the middle pins in a plug, the 2nd (orange) on the surrounding pins, the 3rd (green) on the left hand pins, and 4th pair (brown) on the right side of the plug. The jack has circuits inside that change them around to reduce interference so every brand has them in a different order on the back of the jack.

It definitely looks worth reterminating them if you have the punchdown tools, but make sure you follow the same colour coding on the jack all around the house. T568A is usual in NZ so if the jacks you get in the new panel are a different brand then just follow the colour codes on the jack. Don't try it if some cables don't have enough length at the jack.




Qualified in business, certified in fibre, stuck in copper, have to keep going  ^_^



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  Reply # 874349 9-Aug-2013 08:38
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Great, thanks! I have the correct punchdown tools and there are generous drip loops in the walls, so lots of cable to spare.

Thanks for all the help. Very informative.

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