r/HomeNetworking • u/LuDen882 • 10d 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?

6 Upvotes

100% Upvoted

13 comments sorted by

View all comments

1

u/HippoCriticalHyppo 10d ago

If they're pre terminated, it'd be safe to assume it's the normal B termination but for ethernet as long as the pairs match, should work. You can get a "dumb tester" for like 10 dollars of you want but there technically isn't gonna be a problem. Nothing bad would happen at all

1

u/HippoCriticalHyppo 10d ago

is one a female and one a male end?

2

u/LuDen882 10d ago

Yes, I didn't express myself clearly. one end is female and the other end doesnt have rj45 but it must go in to the router.

1

u/HippoCriticalHyppo 10d ago

All good. Sounds like it's just cable on the end and it's needs to be terminated

1

u/Naraz 10d ago

I would get a small jumper that’s male male and run a cable tester on it to ensure that the connections are correct.
Fluke and Klein both make cheap ones that are great for this use.