Path: utzoo!utgpu!news-server.csri.toronto.edu!clyde.concordia.ca!uunet!samsung!usc!zaphod.mps.ohio-state.edu!uwm.edu!bionet!hayes.ims.alaska.edu!accuvax.nwu.edu!nucsrl!telecom-request From: floyd@hayes.ims.alaska.edu (Floyd Davidson) Newsgroups: comp.dcom.telecom Subject: Re: What is "Supervision"? Message-ID: <14257@accuvax.nwu.edu> Date: 1 Nov 90 10:59:39 GMT Sender: news@accuvax.nwu.edu Organization: University of Alaska Fairbanks Lines: 29 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 784, Message 1 of 12 In article <14206@accuvax.nwu.edu> Tom Gray writes: >>What is meant by "supervision?" >Control information is sent two ways on a telephone loop. Outgoing >(ie from telephone to CO/PBX or the originating side of a trunk), its >called signalling. Incoming (ie from CO/PBX to telephone or the >terminating side of a trunk its called SUPERVISION. There is a special >type of supervision called answer supervision, which indocates that >the called end has answered and the call is completed and later that >the called end has released. >Hope this helps - forward and back - siganlling and supervision. The direction does not make any difference. Supervision is control signaling. Ref: "Notes on the BOC Intra-LATA Networks - 1986", Bell Communications Research. See page G-29. Comment: I liked the title "Notes on the Network", as it used to be known, a lot better. Nicer sound to it... Floyd L. Davidson floyd@hayes.ims.alaska.edu floydd@chinet.chi.il.us Salcha, AK 99714 connected by paycheck to Alascom, Inc. When *I* speak for them, one of us will be *out* of business in a hurry.