Just to clarify, Part 68 has no requirements for the power of individual frequencies, their frequencies, or the twist. It does say that the 3 second average power of DTMF must be less than 0 dBm (for a loop-start line). For manual dialling equipment, a 40% duty cycle can be assumed.
--Jack Marshall Stephen Phillips wrote: > > Pete, > > Go with ANSI/EIA/TIA-496-A-1989. There is no FCC spec., but RS 496 > values are good. Last I knew anyway... > > Best regards, > > Stephen C. Phillips > > ----- Begin Included Message ----- > > >From [email protected] Tue Dec 17 13:14:19 1996 > To: [email protected] > From: "Pete Van Raalte" <[email protected]> > To: [email protected] > Date: Tue, 17 Dec 1996 10:11:53 EST > Subject: US DTMF Requirements > > TREG'ers, > > I am looking for specs on DTMF frequency, amplitude, and twist in the > US. I have found one listing in ANSI/EIA/TIA-496-A-1989, but I have > not found anything in FCC requirements. > > Is DTMF specified somewhere in the bowels of Part 68? > > advTHANKSance > > Pete > ---------------------------------------------------------------------------- > Peter Van Raalte | Email: [email protected] > Compliance Engineer | > V-Band Corporation | Phone: 914-789-5117 > 565 Taxter Road | > Elmsford NY 10523 | FAX: 914-347-3432 > --------------------------------------------------------------------------- > > ----- End Included Message ----- -- ------------------------------------------------------------------------ Jack Marshall Phone: (617) 238-6528 Bay Networks, Inc. Fax: (617) 272-2618 Remote Access Business Unit email: [email protected] 53 Third Avenue Burlington, MA 01803 ------------------------------------------------------------------------
