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> If the wire is broken inside it's insulation then it effectivly > acts as a capacitor. To AC, especially at high frequencies, > a capacitor is a conductor. But to DC it's an insulator. > Without 50VDC on the line phones don't work... > Yes! that makes sense. I've been talking to two BT engineers this evening and neither of them were able to explain it! I can't wait to tell them. presumably I must the get a 90 degree lag in my connection :-) Many thanks James -- The Mailing List for the Devon & Cornwall LUG Mail majordomo@xxxxxxxxxxxxx with "unsubscribe list" in the message body to unsubscribe. FAQ: www.dcglug.org.uk/linux_adm/list-faq.html