Hello TREG'ers, I'm trying to get a handle on the number of FAX machines that do not generate the 1100 Hz calling tone. Can anyone enlighten me or vector me to a resource?
Calling tone is the method used by most FAX/telephone switches to detect if an incoming call is a FAX call or a voice call, but some FAX machines don't produce them, in part because the T.30 standard doesn't (or didn't) require this tone. I believe there was an effort to make this a requirement, but I'm not sure if this came to be or not. I've heard anecdotally that about 5% of the existing FAX machines today do not produce calling tone, but I have no way to confirm this number. Any info? -- Scott Roleson ----------------------------------------------------------------------- Scott Roleson, PE | Internet: [email protected] EMC & Telecom Engineer | http://www.WP.com/SRoleson San Diego Division MS 8-60 | Telephone: +1-619-655-4809 Hewlett-Packard Company | FAX: +1-619-655-5931 16399 W. Bernardo Drive | Amateur Radio: KC7CJ San Diego, CA 92127-1899 USA | Any opinions are my own, not HP's. -----------------------------------------------------------------------
