Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!accuvax.nwu.edu!nucsrl!telecom-request From: Tad Cook Newsgroups: comp.dcom.telecom Subject: Re: FCC REN Numbers Message-ID: <8284@accuvax.nwu.edu> Date: 25 May 90 22:18:14 GMT Sender: news@accuvax.nwu.edu Organization: very little Lines: 46 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 386, Message 1 of 7 In article <8185@accuvax.nwu.edu>, 0004261818@mcimail.com (David Tamkin) writes: > In volume 10, issue 377, Julian Macassey answered some of Steve > Friedl's questions about FCC ringer equivalence numbers. > I have three far simpler ones (I guess): > 1. What does the B or A after an REN mean? A B type ringer must respond to 16 to 68 Hz ringing frequency, and an A ringer only responds to 20 or 30 Hz, +/- 3 Hz. > 2. If the ringer on a telephone can be turned off, does it no longer > count in figuring the total REN load on a line? A phone with the ringer turned off SHOULD have no REN load on the line, but I could imagine an electronic ringer that still has it's detector across the line, but the sound source is off. > 3. Two of my modems *do* have REN's, though neither has any sort of > bell or gong. They check in at "0.4 1.2B" and "0.5A 1.6B" > respectively. My other modem has a speaker and thus does make a noise > (but the speaker is powered by the electric utility, not the telco); > it has an FCC ID but no REN on it at all. What's the question? There are other ringer types (A thru N) for different ringing frequencies. The B type is not frequency selective, but all of the others are. This allows frequency selective ringing on party lines. In article <7911@accuvax.nwu.edu>, tell@oscar.cs.unc.edu (Stephen Tell) writes: > > What is the conversion factor between RENs and somthing your average > > EE can understand, like "milliamps at 90vrms, 20Hz?" A ringing generator that is capable of powering 5 REN should be able to supply ABOUT 5 watts. Tad Cook Seattle, WA Packet: KT7H @ N7HFZ.WA.USA.NA Phone: 206/527-4089 MCI Mail: 3288544 Telex: 6503288544 MCI UW USENET:...uw-beaver!sumax!amc-gw!ssc!tad or, tad@ssc.UUCP