Silicon Laboratories SI2493/57/34/15/04 SAS Tone Frequency, SAS Cadence for Supported Countries

AN93

The even-numbered registers, (UA0, UA2, etc.), control the amount of time the tone is expected to be present, and the odd-numbered registers select the amount of time the tone must not be present. The values are expressed in 10 millisecond units. For example, a cadence of on 500 ms, off 300 ms then on for 500 ms may be selected by writing 0x0032 to UA0, 0x001E to UA1 and 0x0032 to UA2. The unused registers should be written to 0. The default cadence setting is UA0 equal to 001Eh, and the remaining nine registers are set to zero.

Table 101 defines the SAS cadence for each supported country. The on-time is listed in bold. These data were obtained from ITU-T Recommendation E.180 Supplement 2 (04/98).

Table 100. SAS Tone Frequency

SAS_FREQ (U9F)	SAS Frequency
0x0000	440 Hz (Default)
0x0001	400 Hz
0x0002	420 Hz
0x0003	425 Hz
0x0004	480 Hz
0x0005	450 Hz
0x0006	900 Hz
0x0007	950 Hz
0x0008	523 Hz
0x0009	1400 Hz

Table 101. SAS Cadence for Supported Countries*

Country	Tone	Frequency (Hz)	Cadence (seconds)	U Registers
Angola			1.0 – 5.0	U9F = 0x0001
	Waiting Tone	400		UA0 = 0x0064
				UA1 = 0x01F4
				U9F = 0x0000
Anguilla	Waiting Tone	440	0.5 – 10.0 – 0.5	UA0 = 0x0032
				UA1 = 0x03E8
				UA2 = 0x0032
Antigua and	Call Waiting		0.6 – 10.0	U9F = 0x0004
		480		UA0 = 0x003C
Barbuda	Tone
				UA1 = 0x03E8
				U9F = 0x0003
Argentine Republic			0.4 – 0.2 – 0.4 – 4.0	UA0 = 0x0028
	Waiting Tone	425		UA1 = 0x0014
				UA2 = 0x0028
				UA3 = 0x0190

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