Help - Anyone seen an external phone line with 3 inner yellow cables?

thorganby

Either of the twisted pairs may have been used.

Using a meter find the pair that have 0V and -50V

0V wire to 'A' connected to internal Pin 5

-50V wire to 'B' connected to internal Pin 2

It will still work if the line pair is reversed but it won't be correct.

Barkered

I think we got there...Thanks all.
So only the whote and orange needed into 2 and 5...Now working. Thank you all.

B_G_B

Just for interest...... Back in the day, drop wire was just a two wire, steel inner For strength under tension then copper coated for better conductivity. Prior to that 'open spans were used. (non insulated single conductors) When more people started to work from home and required additional lines for fax, ISDN2 (home highway), private services, etc, BT started using this type of drop wire as standard. The early examples were too strong! I remember the storms of '87, where trees had fallen across lines, where either the customers facia would be pulled off the house, or the pole would be pulled over. Unbelievable stuff.