Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.csd.uwm.edu!gem.mps.ohio-state.edu!ginosko!uunet!wuarchive!texbell!vector!telecom-gateway From: nc386!fmsystm!macy@hal.uucp Newsgroups: comp.dcom.telecom Subject: Re: Unusual Warning Notice on Phones Message-ID: Date: 26 Aug 89 07:23:35 GMT Sender: news@vector.Dallas.TX.US Reply-To: macy@fmsystm.UUCP (Macy Hallock) Organization: F M Systems Medina, Ohio USA Lines: 34 Approved: telecom-request@vector.dallas.tx.us X-Submissions-To: telecom@eecs.nwu.edu X-Administrivia-To: telecom-request@vector.dallas.tx.us X-TELECOM-Digest: volume 9, issue 326, message 9 of 9 X-GATEWAY-WARNING: original 'Date' value is too old for posting X-Original-Date: Fri Aug 18 14:57:49 1989 In article judice@kyoa.enet.dec.com (Lou Judice 15-Aug-1989 0916) writes: >X-TELECOM-Digest: volume 9, issue 300, message 8 of 8 >While moving offices recently, we noticed the following odd label on the >bottom of AT&T straight sets (normal single line phones): > > WARNING > > USE FOR BUSINESS SYSTEMS ONLY OR YOU > RISK AN ELECTRICAL SHORT CIRCUIT. Generally speaking, this indicates the sets are modified for use behind 1A2 key telephone equipment. This older style electromechanical key equipment tequired a single line set to put out a dry contact closure when off hook, on the yellow+black base cord wires. These same wires were used in residential applications to provide dial light power for Trimline sets, from a 2012A transformer. Unless the 500/2500 sets were field modified, the suffix on the designation was different form the usual 500D (Its been too long, I can't remember all the old Western Electric numbers!) I've got my old Key Syetems Manual around her somewhere.... Plug in a A-lead control set in a residence and during the next long phone call using that set, the subscriber would notice a distict smell of charred copper+enamel insulation. Rumor had it that more than one residence burned to the ground due to shorted dial light transformers ! Macy Hallock fmsystm!macy@NCoast.ORG F M Systems, Inc. hal!ncoast!fmsystm!macy Medina, OH 44256 Voice: 216-723-3000 X251 Disclaimer: My advice is worth what you paid for it.