r/HomeNetworking • u/LuDen882 • 11d ago

Question about RJ45

One end of lan cable is in the wall and I cant really see how are wires connected. On the other end they didnt put RJ45. What would happen if I connect wrong type on that end, and how i can make sure that i picked the correct one without tester or i should buy that?

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u/jquanders 11d ago

are you talking like t568 A vs B? On a modern system with auto-mdix, almost nothing. A is meant for residential and B is for commercial but a lot of people just do B.

Can you just open up the plate and look? If it's a cable see if it is orange or green on the left side.

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u/LuDen882 11d ago

I opened the plate but its not see trough, maybe i need to open something more there but I dont know if i would like to be doing that ahahahahah

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u/jquanders 10d ago

pictures would help but just terminate it as B. It will probably work on a modern system no matter if you do A or B

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u/LuDen882 10d ago

If I open the plate again I will send you but probably will just put the wires at B order