Specifications

- 59 -
AS/CA S002:2010 COPYRIGHT
OCTOBER 2010
APPENDIX
A PSTN SERVICE TONE CHARACTERISTICS
Tone Frequency
(Hz)
Cadence
(s)
Level
(dBm)
PRE-ANSWER
Max. Min
Dial 425 or
425 * 25 or
400 + 425 + 450
400 + 425
Continuous (for a minimum of 10 s) –13 –24
Stutter Dial 425 * 25 or
400 + 425 + 450
0.1 ON, 0.04 OFF, repeated
(for a minimum of 10 s)
–13 –24
Ringing 400 + 450 or
425 * 25 or
400 + 425 + 450
0.4 on, 0.2 off, 0.4 on, 2.0 off,
repeated
–13 –24
Busy 425 0.375 on, 0.375 off, repeated –13 –24
Congestion 425 0.375 on, 0.375 off
0.375 on (attenuated by 10 dB),
0.375 OFF, repeated
–13 –24
Number
Unobtainable
425 2.5 on, 0.5 off, repeated –13 –24
Facilities 425 Continuous –13 –24
POST-ANSWER
Call Waiting 425 or 525 0.2 ON 0.2 OFF 0.2 on 4.4 off (for 45
s)
–13 –34
Conference 425 or 525 or
1400
1.0 on 15 off (first burst)
0.36 on 15 off (subsequent bursts)
OTHER
Echo Canceller
Disable
2100 1.0 ON (with phase reversals each
450 ms)
–7 –27
Echo Suppressor
Disable
2100 0.7 ± 0.3 on (single burst) –7 –27
Data Calling (CNG) 1300 0.6 ON 1.75 off –7 –27
Data Answering 2100 2.6 on (minimum) –7 –27
Howler 1500 to 3200 Continuous, swept frequency,
graduated level
+10 –20
Note 1: These tones are indicative of the Australian PSTN. Centrex services
provided by some carriers and carriage service providers may
apply tones with different cadences in some circumstances. The
particular carrier/carriage service provider should be consulted for
further information.