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Cat5 Wiring A vs B

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#1 amallon


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Posted 20 April 2017 - 09:24 AM



I am wiring a small office in Cat6 Cable.  At each point where a PC is to be located the electrician has wired the RJ45 module to correspond to type B.  At the patch panel end he has terminated to type A.  The strange thing is that everything works.  I when I connect in one of the PC's in the office connects to the network no problem.  From what I have read online everyone say both ends need to be the same, do I need to change both sides to match?  Are there any side effects to leaving things as they are?


Also I have bought a basic cable tester for 25 quid on amazon.  When I plug it into both ends of a patch lead I see lights 1-8 come on in sequence.  If I plug one end into a computer point in the office and the other end into the patch panel the lights jump around all over the place.  This happens even if both ends are A or B.  I'm thinking there is something in the patch panel that doesn't agree with the tester?

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#2 Wand3r3r


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Posted 20 April 2017 - 09:50 AM

A to B makes a crossover cable.  It works because modern nics detect that and compensate accordingly.  Installer should have been made to come back and complete the job correctly

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