Specifications

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AS/CA S002:2010 COPYRIGHT
OCTOBER 2010
5.3.3.2 The specifications of the intrusion tone alternatives at the PSTN
interface port (+3 dBr relative level point) are
—
(a) an initial burst of 425 Hz ±10 Hz for 80 ms to 800 ms at a level in
the range –7 dBm to –13 dBm, repeated at intervals of
15 s ±3 s; or
(b) an initial burst of 425 Hz ±10 Hz for 800 ms ±10% at a level in the
range –7 dBm to –13 dBm.
Note 1: Absolute levels at other ports are dependent on the relative levels
assigned to those ports, for example, see AS/CA S003 [4] for CSS.
Note 2: The frequency and power level should be measured during the ‘on’
period with the CE terminated in the nominal 600 Ω resistive
impedance.
5.3.3.3 The return loss requirements of Clause 5.4.3 shall be met during
intrusion tone connection.
5.3.3.4 The intrusion tone facility should not be capable of being disabled
by the user.
Compliance with Clause 5.3.3 should be checked by measurement
as described in Clause 6.7.9.1.
Note: There is other Commonwealth and State legislation relating to the
recording of and listening to communications over the
Telecommunications Network. Compliance with this Standard
should not be taken to mean that any subsequent use of the
equipment complies with other relevant legislation.
5.3.4 Supervisory tones
5.3.4.1 Pre-answer tones
Pre-answer supervisory tones transmitted to the PSTN at the PSTN
interface port (+3 dBr) shall be as specified below:
(a) Ring Tone A
(i) Frequency 425 Hz ±10 Hz, amplitude modulated in the
range 90% to 99% by a frequency of 25 Hz ±1 Hz with
carrier unsuppressed.
(ii) Cadence 0.4 s on, 0.2 s off, 0.4 s on, 2 s off, ±10%.
(b) Ring Tone B
(i) Frequency A combined signal of 450 Hz ±10 Hz and
400 Hz ±10 Hz of equal amplitude.
(ii) Cadence 0.4 s on, 0.2 s off, 0.4 s on, 2 s off, ±10%.
(c) Busy Tone
(i) Frequency 425 Hz ±10 Hz.
(ii) Cadence 0.375 s on, 0.375 s off, ±10%.