Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!pacific.mps.ohio-state.edu!linac!att!pacbell.com!lll-winken!telecom-request From: mitel!Software!meier@uunet.uu.net (Rolf Meier) Newsgroups: comp.dcom.telecom Subject: Re: More on Selective Ringing Message-ID: Date: 1 Apr 91 18:01:54 GMT Sender: Telecom@eecs.nwu.edu Organization: Mitel. Kanata (Ontario). Canada. Lines: 39 Approved: Telecom@eecs.nwu.edu X-Submissions-To: telecom@eecs.nwu.edu X-Administrivia-To: telecom-request@eecs.nwu.edu X-Telecom-Digest: Volume 11, Issue 263, Message 8 of 16 In article David Lesher writes: > few years ago North Supply listed replacement ringers for 500 sets in > four different schemes. Donald named three terms. I recall: > 20, 30, 40, 50, hz [decimatic??] > 22, 33, 44, 55, 66 hz > 16, 25? 35.5? etc hz > From REA form 522, Part III: single frequency: 20 Hz decimonic: 20 Hz 30 Hz 40 Hz 50 Hz harmonic: 16 2/3 Hz 25 Hz 33 1/3 Hz 50 Hz 66 2/3 Hz [actually I added this one since it is sometimes used] sychronomic: 20 Hz 30 Hz 42 Hz 54 Hz Another interesting spec is that the voltage increases as frequency increases, and the generator must be capable of up to 140 Vrms on the higher frequencies! Hope this helps. Rolf Meier Mitel Corporation