Praveen, If you haven't got the info yet, send me your fax number and I'll fax across a list of these parameters for a whole bunch of countries from a report we wrote some time ago. Includes all of Europe, USA etc.
Regards Matthew Genesys IBS Ltd Radio & Telecoms Approvals Worldwide PSTN21 Automated Telecom Test System Singleton Court, Wonastow Road Monmouth, NP25 5JA, UK Tel: +44 1600 710300 Fax: +44 1600 710301 www.genesysibs.com -----Original Message----- From: [email protected] [mailto:[email protected]]On Behalf Of Praveen Rao Sent: 28 February 2001 06:28 To: [email protected] Subject: DTMF tone detection Hello members, I'm trying to find the requirements of DTMF tone detection for various countries. I have the requirements for Australia ( shown below ). Can someone help me with the other countries please. I believe there are no mandatory requirements for DTMF detection for Europe and USA, please correct me if I'm wrong. Australian Requirements : AS/ACIF S003 : 1999 If DTMF signal detection is provided, the following requirements are to apply: (a) DTMF signals that are within the following limits shall be recognised: (i) Frequency tolerances of 1 (1.5% + 2 Hz) from the nominal frequency as specified in ACA Technical Standard 002 [2]. (ii) A total RMS power level between 0 dBm and -20 dBm with a maximum difference between the high frequency tone and the low frequency tone power of +4 dB to -4 dB relative to that of the low frequency tone. (iii) A break between tone signals of 70 ms and greater, as an interdigital pause. (iv) A valid tone signal of 40 ms duration and greater. Now, what are these limits for : USA, Europe (especially UK), South Africa, Korea and Singapore Thanks very much in advance. Praveen Rao
