Dirty network cable hack...
Before we start, I know that what I'm trying to do here is completely and utterly ridiculous and destined to fail so please spare me the lectures even if you're desperate to do one. I'm attempting a dirty hack here, it's not meant to conform to any standards. It's a deliberate, unashamed botch job!
Anyway... I live in a rented house. I'd really love to have a cabled network connection to the upstairs room where my main computer from the router, which is in the living room, but I'm not convinced my landlord will want me laying cables about the place so I haven't bothered asking about it. Our router is next to the master telephone socket and there is an extension to the room the computer is which we don't use. I'd estimate the extension is no more than 6 metres long.
I decided as an experiment to have a go at using the wiring for the telephone extension to create a network connection to the computer room... I'll put it back how it was when we move. Telephone wire has 4 cores, which is enough for 10/100, but there are no twisted pairs, so the potential for interference and crosstalk is painfully high.
Anyway, I created a 30cm patch lead as a test, using a short length of phone wire with an RJ45 at each end. Figured this was a good way to start, that length of cable is not so likely to pick up any noise. Worked a treat, no difference in speed. Sadly it didn't work with the phone extension, which is definitely disconnected from the phone line and any phones... I did have to fix an outside break in the cable, using my soldering iron! I get a link light, but the computer never picks up an ip. The link light on the pc and the light on the router both flicker like mad, but there's no actual connection.
Now I know this experiment was doomed to fail right from the beginning but I want to be sure that I'm not simply the victim of bad wiring. Does anyone know what could cause the constant flickering link light? Is that likely to be a crosstalk/interference problem? Have I connected one bit to a wrong bit? I'm after ideas here... I want to make something that shouldn't work, work :D
Right now I'm tempted to replace the phone wire with Cat5, as I know this will work for both... but a lot of the extension is painted over so I'm not convinced I can change it without it being noticed ;)