Specifications

AN93
Rev. 0.8 107
The SAS tone varies between countries and requires
configuration of the user registers U9F – UA9. The
SAS_FREQ (U9F) register sets the expected SAS tone
frequency as shown in Table 81. The default SAS
frequency is 440Hz. The expected cadence is set in the
ten cadence registers SAS_CADENCE0 (UA0) through
SAS_CADENCE9 (UA9). The even numbered
registers (UA0,UA2,etc.) control the time that the tone is
expected to be present and the odd numbered registers
select the time that 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 0032h to UA0,
001Eh to UA1 and 0032h 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 82 defines the SAS cadence for each supported
country. The on-time is listed in bold. This data was
obtained from the ITU-T Recommendation E.180
Supplement 2 (04/98).
Table 81. 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 82. SAS Cadence for Supported Countries*
COUNTRY TONE FREQUENCY
(Hz)
CADENCE (Seconds) U Registers
ANGOLA WAITING
TONE
400 1.0 – 5.0 U9F=0x0001
UA0=0x0064
UA1=0x01F4
ANGUILLA WAITING
TONE
440 0.5 – 10.0 – 0.5 U9F=0x0000
UA0=0x0032
UA1=0x03E8
UA2=0x0032
ANTIGUA AND
BARBUDA
CALL
WAITING
TONE
480 0.6 – 10.0 U9F=0x0004
UA0=0x003C
UA1=0x03E8
ARGENTINE
REPUBLIC
WAITING
TONE
425 0.4 – 0.2 – 0.4 – 4.0 U9F=0x0003
UA0=0x0028
UA1=0x0014
UA2=0x0028
UA3=0x0190
ARUBA CALL
WAITING
TONE
425 0.2 – 0.2 – 0.2 – 4.4 U9F=0x0003
UA0=0x0014
UA1=0x0014
UA2=0x0014
UA3=0x01B8