"Chris Isbell" wrote in message
...
On Sun, 31 May 2009 13:22:33 +0100, tony sayer
wrote:

Indeed it is .. we once used around three miles of phone cable overhead
and underground for an RSL and apart from a bit of "top" loss its was
very quiet indeed..

I was once told that the cables on telephone posts are arranged to
form a twisted pair. (I.e. the cables move from insulator to
insulator so that they twist around each other.)

Open -wires were arranged that way. Two pairs on 4 insulators were rotated
90 degrees every so often forming a quad. But therse all went out of use
years ago, in overhead cables the pairs are twisted inside the cable.

David.