Path: utzoo!attcan!uunet!husc6!rutgers!ucsd!ames!killer!vector!nobody From: westmark!dave@rutgers.edu (Dave Levenson) Newsgroups: comp.dcom.telecom Subject: Re: DTMF vs. Touch-Tone Message-ID: Date: 30 Dec 88 16:22:44 GMT Sender: chip@vector.UUCP Lines: 16 Approved: telecom-request@vector.uucp X-Submissions-To: telecom@bu-cs.bu.edu X-Administrivia-To: telecom-request@vector.uucp X-TELECOM-Digest: volume 9, issue 1, message 3 In article , imp@crayview.msi.umn.edu (Chuck Lukaszewski) writes: > Actually, DTMF has always been generated by premises telephones. The in-band > signalling to which you refer was done with single MF tones which were on > 200-Khz frequency multiples.... Actually, the inter-office signaling uses tone-pairs. Each digit (and a couple of "control characters") is represented as two of five tones. The individual frequencies are spaced at 200 Hz (not kHz) intervals. -- Dave Levenson Westmark, Inc. The Man in the Mooney Warren, NJ USA {rutgers | att}!westmark!dave