jon_sree@world.std.com (Jon Sreekanth) (12/04/90)
I know the subject line sounds obscure; I couldn't describe it any better in one line. From a public phone, for example, to make an operator assisted call, or to make a calling card, one might dial 0 - area code - number. Then there's a pause, and a sound best described as a 'boiiiing', or a 'pinnng', and after that, one enters the calling card number (or after time out, operator comes on line.) What are the specs on that tone? Frequency (single, or mixture of frequencies), envelope, duration, etc. (We're thinking of using that as a prompt on one of our products.) Thanks, Jon Sreekanth Assabet Valley Microsystems Fax and PC products 346 Lincoln St #722, Marlboro, MA 01752 508-562-0722 jon_sree@world.std.com
tnixon@uunet.uu.net (Toby Nixon) (12/05/90)
In article <15178@accuvax.nwu.edu>, jon_sree@world.std.com (Jon Sreekanth) writes: > From a public phone, for example, to make an operator assisted call, > or to make a calling card, one might dial 0 - area code - number. Then > there's a pause, and a sound best described as a 'boiiiing', or a > 'pinnng', and after that, one enters the calling card number (or after > time out, operator comes on line.) > What are the specs on that tone? Frequency (single, or mixture of > frequencies), envelope, duration, etc. I can't quote all the specs to you (and can't look them up, because I'm in a hotel room in Florida rather than in my office), but I CAN tell you where to find the info: Notes on the BOC Intra-LATA Networks-1986 TR-NPL-000275 Issue 1, April 1986 Page 6-180 Table AQ, Item 24 Calling Card Service Prompt Tone If you don't have this TR, you can order it from Bellcore. Toby Nixon, Principal Engineer | Voice +1-404-449-8791 Telex 151243420 Hayes Microcomputer Products Inc. | Fax +1-404-447-0178 CIS 70271,404 P.O. Box 105203 | UUCP uunet!hayes!tnixon AT&T !tnixon Atlanta, Georgia 30348 USA | Internet hayes!tnixon@uunet.uu.net
dave@westmark.westmark.com (Dave Levenson) (12/05/90)
In article <15178@accuvax.nwu.edu>, jon_sree@world.std.com (Jon Sreekanth) writes: > What are the specs on that tone? Frequency (single, or mixture of > frequencies), envelope, duration, etc. From "Notes on the BOC Intra-LATA Networks" Bellcore, 1983: Calling Card Service-Prompt Tone: 941 Hz + 1477 Hz for 60 milliseconds, at -10 dBm0/frequency at -3 TLP (-7 dBm0) followed by 440 Hz + 350 Hz for 940 milliseconds (exponentially decayed from -10 dBm per frequency at -3 TLP at time constant of 200 milliseconds). Note that the initial 60 milliseconds of 941 + 1477 is the equivalent of the touch tone # symbol. This is done because the # will disable the tone-to-pulse translators used on some older central office and PBX equipment. A caller using a tone-dial phone behind a tone-to- pulse converter will thereby be allowed to send the calling-card number using tones. The rest of the tone (after the # symbol) is a decaying dial-tone. Dave Levenson Internet: dave@westmark.com Westmark, Inc. UUCP: {uunet | rutgers | att}!westmark!dave Warren, NJ, USA AT&T Mail: !westmark!dave Voice: 908 647 0900 Fax: 908 647 6857