r/techsupport Aug 13 '22

RJ45 jack in home, unsure if data or phone Open | Networking

  • Home built in 2002
  • Jack label reads T568A, CX

How do I know if this jack is phone or data?

5 Upvotes

4

u/OriginalGordol Aug 13 '22

RJ11 is typically phone only, RJ45 is typically ethernet but will also take an RJ11 plug.

3

u/AintNoRest4TyWicked Aug 13 '22

The question now would be cat5 or cat5e.

2

u/VeryNotSera Aug 13 '22

Can't really tell because I have to open the port, it's only labelled internally and it's pretty faded (it is likely 20 years old)

0

u/TheIInSilence4 Aug 13 '22

Easy to tell try to use the port. If it reads 1000 it's 5e if it reads 100 it's 5

1

u/splenetic Aug 13 '22

Cat5 will often do gigabit perfectly well, particularly for shorter distances

2

u/prshaw2u Aug 13 '22

2 or 4 wires it is probably phone, 8 wires is probably data.

2

u/VeryNotSera Aug 13 '22

You're talking about the pinout? Because it's an 8 pin plug. It's 568A

2

u/prshaw2u Aug 13 '22 edited Aug 13 '22

How many wires are actually connected in it. (spelling/auto-correct corrected)

1

u/VeryNotSera Aug 13 '22

I'll have to check but from the brief check behind the wall plate I took it looks kinda like two sets of 4 pins for a total of 8 going to the port.

1

u/prshaw2u Aug 13 '22

Other thing to check is color of wires. Data is blue with white stripe and a white with blue stripe. Same for green and orange and brown I think. Phone lines will have all solid color wires, red green black? Yellow? All pins have wires connected? Probably striped wires? That would be data.

2

u/Amen_Ra_61622 Aug 14 '22

Where does it terminate? If it's a patch panel with nothing plugged into it, it's a data line. Consumer phones would use RJ-11. A VOIP phone would still need to be patched to some internet connection. Which would be the same patch panel used for the rest of the house's internet service.

1

u/VeryNotSera Aug 14 '22

It terminates in the laundry room with a motherboard, what I think is a patch board, and a bunch of coax lines labelled CMP.

2

u/Amen_Ra_61622 Aug 14 '22

A couple of pictures would help so we know what you're dealing with.

1

u/VeryNotSera Aug 14 '22

I'm at work currently, I'll try to get pictures when I get home

1

u/Plzdntbanmee Aug 13 '22

RJ45 = Data RJ11=phone

1

u/VeryNotSera Aug 13 '22

I was under the impression 568A wiring could be either.

1

u/Pristine_Map1303 Aug 15 '22

What's on the other end?

0

u/pegrowe62 Aug 13 '22

For the record... a phone jack won't handle a data cable. The cable fitting is too big. In reverse, a phone jack is too small for the data cable. They look almost identical for someone who really isn't versed. If you can plug a phone in nicely, it's a phone jack. If a data cable fits properly, it's a data jack. Not sure how many people notice, but on the back of a computer for example, it's not like you can get a cable mixed up with another in terms of plugging them in. Each thing has only one jack or inlet where it will fit. The phone cable for a fax won't work in the data jack. It's all the same premise. :) P

3

u/raytaylor Aug 13 '22

The RJ45 socket is designed to accept an RJ11 plug so there can be some confusion there.

1

u/VeryNotSera Aug 13 '22

In 568A a phone cable should work if it's routed to phone.... this isn't really an issue anymore due to VoIP but back in the early 2000s with landlines and such it was.