Gorgon
Member
Gorgon said:mstechca said:_3iMaJ said:The receiver simply uses a PLL to make the appropriate decision on what data was sent.
I know that, but what are the frequencies for the "Mark" and "space" tones?
300/300 Bd (All number in Hz)
Bell 103 calling: 1270(1)/1070(0) answer: 2225(1)/ 2025(0)
V21 calling: 980(1)/1180(0) answer: 1650(1)/1850(0)
75/1200Bd
Bell 202 Calling:387(1)/487(0) answer: 1200(1)/2200(0)
V23 Calling: 390(1)/450(0) answer: 1300(1)/2100(0)
This is taken form the K-series design manual from Silicon Systems.
TOK
Hi mstechca,
You're asking for frequencies and 'Mark' and 'Space' . In the listing above the frequency with a (1) is the 'Mark', and (0) is the 'Space'. I'm sorry I didn't spell it out
I think you'll find your two frequencies in the Bell 202 standard.
TOK