Path: utzoo!attcan!uunet!cs.utexas.edu!news-server.csri.toronto.edu!umich!accuvax.nwu.edu!nucsrl!telecom-request From: kaufman@neon.stanford.edu (Marc T. Kaufman) Newsgroups: comp.dcom.telecom Subject: Re: A/A1 Control For Key Telephone Systems Message-ID: <14085@accuvax.nwu.edu> Date: 27 Oct 90 21:05:17 GMT Sender: news@accuvax.nwu.edu Organization: Computer Science Department, Stanford University Lines: 21 Approved: Telecom@eecs.nwu.edu X-Submissions-To: telecom@eecs.nwu.edu X-Administrivia-To: telecom-request@eecs.nwu.edu X-Telecom-Digest: Volume 10, Issue 768, Message 11 of 11 In article <14050@accuvax.nwu.edu> "Barton F. Bruce" writes: >A 1A2 key system is the electronic replacement for the 1a1 all relay >ones that preceeded them. This is a relatively simple system that >typically has a KSU supporting 4, 6, or 13 cards. Each card is wired >in series with T+R going to the phones. The card does several things. >It can detect ringing and start a local interrupter (to have ringing >and lamp flashing for many lines all in step) and connect the flashing >lamp service to the lamp lead for that line. Ah, yes. Long ago another engineer and myself used to go into the basement of the radio station we worked at, and manually engage the relays. We would set up ring on some or all ten lines, then put a few on hold. This was at 2 AM, and the night DJ thought he was the only one in the building. We could hear him crashing about all over the building, trying to find who was using the phones. Marc Kaufman (kaufman@Neon.stanford.edu)