AS CA S043.3:2015 pdf download.Requirements for Customer Equipment for connection to a metallic local loop interface of a Telecommunications Network—— Part 3: DC, low frequency AC and voiceband.
6 TESTING
6.1 Verification of compliance with requirements
Compliance with all mandatory requirements in this AS/CA Standard is to be verified. This may be done by direct measurement, modelling and analysis, operation or inspection.
Methods for demonstrating compliance of CE with the requirements clauses specified in this Standard are described in Clauses 6.2 to 6.3. Verification of compliance with the referenced standards may be confirmed by test reports to later versions of the referenced standards provided that all clauses of the referenced standards are shown to be met. Alternative methods of demonstrating compliance to those described may be used if the risk of passing non-compliant CE is not increased because of increased measurement uncertainty.
6.2 Standard test conditions
6.2.1 Unless this Standard provides otherwise, testing for compliance with this Standard should be conducted at the nominal supply voltage of the CE and within the following ranges of atmospheric conditions: (a) An ambient temperature in the range of 15°C to 25°C inclusive. (b) A relative humidity in the range of 45% to 75% inclusive.(c) An air pressure in the range of 86 kPa to 106 kPa inclusive.
6.2.2 Where elements in a test configuration are variable, the test should be carried out over the indicated range for that element.
6.2.3 Unless indicated elsewhere within this Standard:
(a) the accuracy level of all measurements should be better than ±2% for voltage and current, ± 0.25% for frequency and ± 0.5% for time; and
(b) the tolerance of the nominal 48 V d.c. test source should be ±0.5 V.
6.2.4 Unless indicated elsewhere within this Standard for an individual test, all component values in the test configuration should have a tolerance of: (a) ± 1% for resistance; (b) ± 1% for capacitance; and (c) —0%, ÷25% for inductors.
6.3 Parameters to be tested
6.3.1 External Stimulus
6.3.1.1 The requirements specified in Clause 5 should be met in the normal operating modes of the CE unless as otherwise specified.
6.3.1.2 In some CE the power level presented to line is dependent on excitation either internal or external to the equipment. This excitation may be determined from the appropriate product specification or with some CE this will require the connection of the associated CE to provide the stimulus.
6.3.1.3 Compliance with Clause 5 should be checked by performing this excitation then measuring the line signal as described by the appropriate tests.
6.3.1.4 Methods for external stimulus and excitation of the CE include the following:
(a) If the CE includes a voice frequency recording and reproducing element in which the signal recording is achieved either by the user or from signals injected into the recording element from the network, the supplier should provide documentation for the user describing how the power levels of signals transmitted to the network are controlled.
(b) If the signal level control is achieved by means of limiters, this should be checked by injecting voice frequency signals, where indicated in the documentation, at any level necessary to test that the limiters are restricting the signals to the network to the specified required limits.
(c) If the CE generates a modulated VF signal in response to an external stimulus initiated by the user, the supplier should provide documentation for the user describing the operating conditions and any associated signal generating devices.
6.3.2 Impulse measurement
6.3.2.1 Impulses caused by the reversal of DC signals described in Clause 5.1 can be measured with a standard impulse counter set having a high impedance (greater than 100 kO //30 pF) bridged across the line.
6.3.2.2 Figure 3 shows the test configuration. Figure 4 shows the approximate representation of an exchange termination and Figure 5 shows the circuit diagram of a filter which meets the requirements of ITU—T Rec. 0.71 [9].
6.3.3 Longitudinal power measurement
The CE under test should be connected to the measuring instrument as shown in Figure 6. A selective measuring set or spectrum analyser having an effective bandwidth sufficiently narrow to measure individual spectral components should be used to explore the frequency band from 200 Hz to 30.175 MHz and to measure the RMS voltage (V) of any spectral component either using the internal calibration or from comparison with a sinusoidal signal of known RMS voltage and the same frequency.AS CA S043.3 pdf download.