Internal Bt Wiring

Hi, I'm trying to isolate a Fibre issue. Does any know what would happen if the BT Drop wire wiring to the Junction box was installed back to front?

Ive had to install a new Junction box where the BT drop wire meets my internal wiring, what are the side effects of getting the wires mixed up?

Thanks in advance.

Does any know what would happen if the BT Drop wire wiring to the Junction box was installed back to front?

Not really making yourself clear there ?

Does any know what would happen if the BT Drop wire wiring to the Junction box was installed back to front?

No dial tone, no sync ?

TBH, the wiring up to the NTE is Openreach property, the internal wiring would be that after the NTE. What issue do you have/are you hoping to resolve ?

I think he means getting the pair of wires in the drop wire back to front, IE the A B connections of the NTE5.

Accoring to this website ( http://www.wppltd.demon.co.uk/WPP/Wiring/UK_telephon... ) it's unlikely to make any difference, except with some modems (especially older USA sourced ones) and some answering machines are fussy about polarity, however I think that page predate's FTTC.

As Zarjaz points out the NTE5 and any wiring prior to this is BT's property and you shouldn't be fiddling with it.

The page linked to by RONSKI gives the polarity (A ground B negative) so if you have a multimeter or the £3-4 one would cost on eBay you can check if you've reversed them on the back of the NTE5 which of course you are not allowed to fiddle with according to your BT T&C.

AFAIK should not affect VDSL2

Thanks for the info. I had to change the junction box, wasn't sure which way was which. Thanks.

Hi Ex BT Eng here.

To be honest the guys don't check when they splice in the cab/BT terminator/Jnction box what way round the wires go as long as you use the correct pair that was used before.
Orange/White or Green/Black.
Either way round to the back plate of the NTE should be fine.


Thanks
Jason