During renovation I've asked the electrician to use two long patch cables originally running from my router to create RJ45 sockets with the intent to later connect the router to the socket using a standard patch cable. So there is a patch cable with one plug cut of and replaced by a socket.
Now, the patch cable connection doesn't work: a device connected to the other side of the cable (either of the two) doesn't detect signal. I've checked one of the sockets which has replaced the original plug and it seems to be wired correctly (read: "as specified on the connector") as 568B.
Since I have problem wrapping my head around what pin is supposed to be connected where on the various cable connections (my confusion is such, that reading How to wire up two RJ45 sockets? didn't help), my questions are:
- Does it matter whether the original patch cable was wired as 568B or 568A, straight or cross?
- Should I be using a cross patch cable or even a less standard wiring to connect the router to the socket? Or is it likely that the connector is either wired incorrectly (missing contact somewhere) or that the cable has been damaged?
- Can you please suggest how to proceed to locate the problem (part of the cable has plastered into the wall, so I would prefer not having to cut it out/replace it)?
Update: devices see temporarily a sign of signal, yet don't pick it up for serious communication, Linux kernel log:
[x0.041818] e1000e eth0: NIC Link is Up 100 Mbps Full Duplex, Flow Control: Rx [x0.041822] e1000e eth0: 10/100 speed: disabling TSO [x0.884898] e1000e eth0: NIC Link is Down
- Could this be a sign of bad contact in the new socket connector?
the problem was actually in the socket connector - it has metal casing and the individual cords were slightly sticking out touching the casing thus short circuiting some five of the lines all together.