RJ11 RJ45 cable, is it the same? (for home network)

Question

Hello,  Well, like many, I have an old wired house, with RJ11 cables (based on the colors and the age), back when telephony was king. So, let's make the most of what we have, right? RJ11 cables have 8 connection wires and RJ45 cables have 8 connection wires (I’m talking about the cables, not what’s at the end, namely the connectors).  Can we then use our RJ11 wiring to connect RJ45 connectors at the end to then run our wired network through it? (interconnected computers + internet with a box) Is there really a physical difference between these cables that are copper and seem to be of comparable size? Is it just a difference in color coding? (considering that RJ45 cables are not always shielded...)

matht · Accepted Answer

Thank you. So, I find myself with cables that have 8 copper wires, installed ten years ago for telephone T connections. How can I know what they correspond to? The only thing I can do is observe, see the color of each of these 8 wires. But then? How to identify them?

brupala · Answer

Hi, yes, there are many differences between cables; they are not just wires that go from one end to the other, there are plenty of categories, just for the local network, not to mention the rest RJ11 only refers to the plug, not the cable, an RJ11 cable does not exist, at best it would mean a 4p4c or 6p4c plug   -- and ... There you go!

matht · Answer

Well, it's pretty simple: I have two computers in two different rooms, a NAS, a network printer, a box... To connect all this little world, I thought using the existing wiring in the house would be the best option. And the existing wiring consists of those that pass through the walls and go to both rooms. But these cables were originally installed for the telephone (10 years ago). So can I use them to interconnect my computers?  In this case, these cables look like what is used with RJ45. But the color codes of the 8 wires are very different: gray, white, purple, brown, blue, orange, pink, beige. A real rainbow!

RJ11 RJ45 cable, is it the same? (for home network)

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