Author Topic: Reconnecting BT Landline Cable - SOLVED  (Read 942 times)

Reconnecting BT Landline Cable - SOLVED
« on: 06 May, 2024, 06:27:38 pm »
I have finally managed to reroute the BT landline cable, which I still need for my internet (until copper connections are discontinued in the next year), which a very lazy BT man routed years ago by drilling through the door!  The linked picture shows a white aerial cable also routed through the door, with the black BT cable below it.  All has gone satisfactorily, including drilling through 450mm of cottage stone wall to get the cable in the right place, and I have reconnected.  I am writing this on the resulting internet connection - so far so good.  However, I seem to have lost the landline phone dial tone.  The cable has 8 wires - orange (which I used), green, blue & brown, and 4 white wires, one of which was connected originally.  Having cut the cable to a new suitable length, I selected the orange wire and one of the white ones, having to do this at random as there are no twisted pairs, and the result is this internet connection.  The white wires are plain white, rather than having a little coloured stripe spiralling around them, as I've seen in ethernet cables.  Does it matter which white wire I select?  Do the white wires have any effect on the landline phone?

All a little complicated by the fact that we've been having thunderstorms here today, meaning the line is tending to drop out more than it normally does (for a few minutes every couple of days on average)!


  • It's mostly downhill from here.
Re: Reconnecting BT Landline Cable
« Reply #1 on: 06 May, 2024, 07:58:23 pm »
ADSL can just-about-work with one leg of the pair disconnected, as you have discovered.

Sounds like you have chosen the wrong white.
Yes, it does matter.
I expect there *is* a tracer colour, if you look closely enough.

The landline phone is a 2-wire system, and needs both ends to work ( like a battery needs both ends connected ).
ADSL is a bit weird and can just-about-work under the severe fault conditions you have created!

Since there are 3 other whites, then trial-and-error might be the easiest method to find out which one you need...

If you have a meter to hand, then measure the DC voltage from the orange to each white in turn. The one you want will show about 48v DC.

Otherwise, You could stick your tongue on the orange and then each of the whites in turn, that would tell you pretty sharpish which one to use...
(Don't actually do that!!...)

Re: Reconnecting BT Landline Cable
« Reply #2 on: 06 May, 2024, 08:51:28 pm »
Thanks, Feanor

I did actually try each white, but got nowhere, but I suspect it was because the line was down at the time.

Best not to do trial and error in thundery weather.  I'll try again tomorrow, when it's quieter, thanks to high pressure building.

Re: Reconnecting BT Landline Cable - SOLVED
« Reply #3 on: 17 May, 2024, 04:45:53 pm »
Finally sorted this out, thanks to Feanor's input above.  Found the relevant white wire (no other markings on any of the white wires) and all back to normal.  Internet a bit faster too.  :thumbsup: