Path: utzoo!utgpu!watmath!clyde!bellcore!rutgers!mailrus!ames!netsys!vector!nobody From: sultra!dtynan@ames.arc.nasa.gov (Der Tynan) Newsgroups: comp.dcom.telecom Subject: Re: In-use light Message-ID: Date: 29 Oct 88 01:43:26 GMT Sender: chip@vector.UUCP Lines: 31 Approved: telecom-request@vector.uucp X-Submissions-To: telecom@bu-cs.bu.edu (TELECOM Digest Coordinator) X-Administrivia-To: telecom-request@vector.uucp (USENET Telecom Moderator) X-TELECOM-Digest: volume 8, issue 166, message 4 {{{ Again...the quoted text is from the message Larry Lang wrote. }}} {{{ However, the quoted text wasn't written by Larry, but rather }}} {{{ quoted by him from a message he was responding to. -chip }}} In article <610@vector.UUCP>, chip@vector.UUCP (Chip Rosenthal) writes: - - The LED would light up whenever an extension - (besides my own) was lifted. The way it worked is simple: - Phone cable has four wires, two active (red and green) - and two inactive (yellow and black). - When you lift a phone off-hook, several switches change position, - some open, some close. I took apart every phone in the house, - found terminals connected to a switch that closed - when the switch hook was lifted, and connected the black and yellow wires - to those terminals. Then I hooked my detector box - to the yellow and the black wires near my phone. - When any rewired switch hook was lifted, the LED lit up. - - Larry Lang - - My employer (Bellcore) has nothing to do with this idea. Aeeesh!!! This is *deadly*. Beware this fix. The phone company often, if not always, uses the black and yellow wires for a second phone line. Connecting them together in a telephone is BAD NEWS. One day you install a second line, lift up the receiver and bang! There goes one exchange interface. - Der -- Reply: dtynan@sultra.UUCP (Der Tynan @ Tynan Computers) {mips,pyramid}!sultra!dtynan Cast a cold eye on life, on death. Horseman, pass by... [WBY]