Specifications

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AS/CA S002:2010 COPYRIGHT

OCTOBER 2010

(b) Single-frequency noise power Any single frequency (in

particular the sampling frequency and its submultiples where

appropriate) over the range 30 Hz to 20 kHz, measured

selectively with a 30 Hz bandwidth, shall not exceed –47 dBm.

threshold level of –32 dBm shall not exceed five counts in

5 minutes, measured using an impulsive noise counter

compliant with ITU-T Rec. O.71 [19], using the 600 Hz to 3 kHz

filter described in § 3.5 therein.

Compliance with Clause 5.4.5 should be checked by using the

method described in Clause 6.7.5.

5.4.6 Longitudinal power limits

During the idle, hold, ringing states, the power level of individual

spectral components of any longitudinal component of the output

signals shall not exceed the limits shown in Figure 26.

Compliance with Clause 5.4.6 should be checked by using the

methods described in Clauses 6.7.14.

5.5 Signalling requirements

5.5.1 Two-wire ring-in/loop-out PSTN line interface

5.5.1.1 Ring signal detection and CE performance during ring

5.5.1.1.1

STS CE which is required to recognise ring signals shall respond to

signals of 200 ms duration or greater, superimposed on 48 V dc of

polarity each with a terminal voltages in the range

—

(a) 50 V r.m.s to 90 V r.m.s over the frequency range 15.3 Hz to

25 Hz; and

(b) 40 V r.m.s. to 90 V r.m.s. over the frequency range 25 Hz to

50 Hz.

Note 1: CE suppliers should nominate to the test house the response or

responses (if any) expected from the CE, when ring signal is applied

to the CE.

Note 2: Some PSTN exchanges may provide ring signals with a CE terminal

voltage from 45 to 95 V r.m.s.

Note 3: The standard ring cadence is nominally 0.4 s ON, 0.2 s OFF, 0.4 s ON

and 2.0 s OFF. Other cadences may also be used in the network for

special purposes e.g. distinctive ring. For characteristics of the PSTN

Distinctive Ring Signal, refer to Appendix E.

Note 4: Ring signals generated by carrier network equipment, CSS and

other CE may have a number of different characteristics. CE which

responds to the ring signal should not be sensitive to differences in

voltage waveshape, d.c. offset, transient changes in voltage level,

or whether the ring signal is supplied in a symmetrical or

asymmetrical mode.