Network Ethernet Cable Tester for LAN RJ45 Cat5 Cat5e Cat6 Cat6a Cat7 UTP/Shielded Cable and RJ11 RJ12

If it's got 8 wires, and in another place in your house you it says Ethernet and cat5e, and the outer sheathing looks the same, it's a good bet it's also cat 5e. The simple way to trace the wire, first make sure nothing is pluged anywhere in you house to one of these Ethernet or phone lines. Get a multimeter and a wire nut and wire strippers. Wire nut and stripper optional but easier. First check the single end you want to connect to. Pick two wires, eg blue and white blue, strip the end a little so you can see copper. On the multimeter set it to Ohms (horseshoe symbol) if theres multiple setting on your multimeter for ohms, I recommend the one that has a little sound symbol, or just the lowest number. First test the multimeter is working and put the two leads together, when you do it should beep and/or show 0 on screen. OL mean open lead, try moving where the wires are plugged into the multimeter. Once you've confirmed the two multimeter leads connected gives you 0 ohms. Then test the pair you picked. One lead on each wire, try not to come into contact with both wires/leads with you skin at the same time. It won't hurt you, just your can give a large reading when the wire is giving none. For this first test, you want the multimeter to say OL when touching the pair. This is a baseline test. Then go to the side with 3 wires. Pick one and get the same two color wires blue and white blue. Strip them and twist the bare copper together, a wirenut helps but is not necessary. Go back to the single wire and test the ohms again on the pair. If it reads a really low number or 0, then the one you tied together is the same one you have in the other room. If it reads OL then that's not your wire. Go back to the three, untwist the pair, pick a different one of the three and rinse repeat. If you have a multimeter , this is easier that wiring the whole thing up then testing it, then rewiring one end up again. Once it's wired up I recommend getting a Ethernet continuity tester and at least two path cables (which you'll need later anyway) they are < $10 on Amazon. I have this one but I saw some cheaper while looking. It's best to test that you put wires in the right place instead of risking expensive electronics and they are great for troubleshooting a non contacting wire. The important thing with these is that both side read in order 1-8, ignore g if you have plastic ends.