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GB/T 15279-2002 PDF English

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GB/T 15279-2002: The specifications of automatic telephone set
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GB/T 15279: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] deliveryName of Chinese StandardStatus
GB/T 15279-2002English150 Add to Cart 0-9 seconds. Auto-delivery The specifications of automatic telephone set Valid
GB/T 15279-1994EnglishRFQ ASK 9 days The specifications of automatic telephone set Obsolete

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GB/T 15279-2002: The specifications of automatic telephone set

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GB ICS 33.050.10 M 40 NATIONAL STANDARD Replacing GB/T 15279-1994 The specifications of automatic telephone set Issued on. JULY 18, 2002 Implemented on. DECEMBER 01, 2002 Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People’s Republic of China; Standardization Administration of the People’s Republic of China.

Table of Contents

FOREWORD... 4 1 SCOPE... 6 2 NORMATIVE REFERENCES... 6 3 TERMS AND SYMBOLS... 7 4 TECHNICAL REQUIREMENTS... 9 5 TEST METHODS... 18 6 MARKING AND PACKING... 49 ANNEX A (NORMATIVE) RELIABILITY TEST (TEST OF MEAN TIME BETWEEN FAILURES OF TELEPHONE SET)... 51

Foreword

GB/T 15279 is the basic standard for automatic telephone sets and also the criterion for the formulation of the standards for analog telephone sets with other functions. The modification of this Standard was made by reference to the relevant suggestions of ITU-T and some typical foreign standards for telephone sets. However, there is no international standard directly corresponding to the entirety of this Standard. This Standard is the revision of GB/T 15279-1994 “The Specifications of Automatic Telephone Set”. It shall replace GB/T 15279-1994 from the implementation date. Compared with the 1994-edition, there are main changes in this Standard as follows. - The contents relating to granular carbon transmitter telephone set (4.2.4, 4.2.5, 5.1.6 and 5.5.3 of 1994-edition) have been deleted; - The technical indicators relating to speed pulse dialing (20 pulses/second) in pulse dialing method (Table 4 in 1994-edition) have been deleted; - The requirements and measuring methods for rotary dial (4.3.3, 4.3.5 and 5.11.10 in 1994-edition) have been deleted; - The recommended dimensions of telephone handset (4.8 in 1994-edition) have been deleted; - Chapter 6 Inspection Rules in 1994-edition has been deleted; - Chapter 8 Reliability Test in 1994-edition has been deleted and changed into a normative annex (Chapter 8 of 1994-edition, Annex A of this Standard) of this Standard; - The index requirements for sending loudness rating (SLR), receiving loudness rating (RLR) and side tone masking rating (STMR) (Table 1 of 1994-edition, Table 1 of this edition of standard) have been modified; - The basic requirements for artificial ear and mouth used for testing purposes (5.1.5 and 5.1.6 of this edition of standard) have been supplemented; - The requirements for amplitude characteristic have been modified. The amplitude characteristic requirements and corresponding test methods for sending and receiving (4.2.4 and 5.4 of 1994-edition; 4.2.4 and 5.4 of this edition of standard) have been proposed respectively; - The requirements for nonlinear distortion of telephone set have been modified. The distortion index of adding 10dB respectively to the normal test values of sending and receiving drive levels and the corresponding test methods (4.2.5 and 5.5 of 1994-edition; 4.2.5 and 5.5 of this edition) have been added; - The DC resistance in off-hook state (4.2.8 of 1994-edition; 4.2.9 of this edition) has been modified; - The calculation formulas for echo balance return loss and test methods for balance return loss (Formula (12) of 1994-edition; Formula (11) of this edition) have been modified; - The index requirements and measuring methods for sending and receiving noises (4.2.7 and 5.6 of this edition) have been added; - The lightning resistance requirements have been modified and YD/T 993-1998 “Technical Requirements and Test Methods of Lightning Resistibility for Telecommunication Terminal Equipment” has been cited directly (4.13 of 1994-edition; 4.11 and 5.20 of this edition); - The limit values of and test methods for electromagnetic compatibility have been modified and YD/T 968 Limits and Methods of Measurement of Electromagnetic Compatibility for Telecommunication Terminal Equipment has been cited directly (4.14 and 5.22 of 1994-edition; 4.12 and 5.21 of this edition); - The reliability requirements (4.15 of 1994-edition; 4.14 of this edition) have been modified; - The relevant test methods have been standardized by reference to YD/T 720-1998 “Test Procedures For Telephone Sets” (Annex A of the 1994-edition is a normative

1 Scope

This Standard specifies the technical requirements, test methods, reliability test, marking and packing for fixed automatic telephone sets. This Standard applies to the pulse and dual-tone multi-frequency handset telephone sets that have access to analog interfaces of public network. Other multifunctional terminals that have handset function can also use this Standard as a reference. However, other functions not specified in this Standard must be tested according to the requirements and by reference to relevant standards.

2 Normative references

The articles contained in the following documents have become part of this Standard when they are quoted herein. For the dated documents so quoted, all the modifications (excluding corrections) or revisions made thereafter shall not be applicable to this Standard. For the undated documents so quoted, the latest editions shall be applicable to this Standard. GB/T 2423.1 Environmental testing for electric and electronic products-Part 2.Test methods-Tests A. Cold (idt IEC 60068-2-1.1990) GB/T 2423.2 Environmental testing for electric and electronic products-Part 2.Test methods-Tests B. Dry heat (idt IEC 60068-2-2.1974) GB/T 2423.3 Basic environmental testing procedures for electric and electronic products-Test Ca. Damp heat, steady state (eqv IEC 60068-2-3.1984) GB/T 2423.6 Environmental testing for electric and electronic products-Part 2.Test methods-Test Eb and guidance. Bump (idt IEC 60068-2-29.1987) GB/T 2423.8 Environmental testing for electric and electronic products-Parts 2.Test methods-Test Ed. Free fall (idt IEC 60068-2-32.1990) GB/T 2423.10 Environmental testing for electric and electronic products-Part 2.Test methods-Test Fc and guidance. Vibration (Sinusoidal) (idt IEC 60068-2-6.1982)

3 Terms and symbols

3.1 Terms and symbols 3.2 Graphic symbols Audio frequency oscillator Selective level meter

4 Technical requirements

4.1 Service conditions 4.2 Call transfer characteristic 4.2.1 Loudness rating Connect the telephone set to analog telephone network test system. Its sending and receiving loudness ratings and side tone masking rating shall meet the requirements of Table 1. 4.2.3 Receiving frequency response Under the condition of 0km user line, the typical curve (the broken line shown in Figure 2) and range of permissible deviation (the solid line shown in Figure 2) of receiving frequency response are shown in Figure 2. 4.2.4 Amplitude characteristic (change of loudness with input level) 4.2.5 Nonlinear distortion 4.2.6 Maximum sound level in case of switching on and off of telephone set The maximum sound level in case of switching on and off of telephone set shall not be greater than 125dB(A). 4.2.7 Noise characteristic 4.2.8 The telephone set shall not have any singing phenomenon in normal use. 4.2.9 The DC resistance of the telephone set in off-hook state shall not be greater than 350Ω. 4.3 Dialing characteristic of telephone set 4.3.1 Characteristic of DC pulse signal 4.3.2 Characteristic of dual-tone multi-frequency signal 4.3.2.6 Power level of unwanted signal When the telephone set is dialing, the total power level of the unwanted frequency component in output signal shall at least be 20dB lower than the power level of the low frequency component in dual-tone multi-frequency signal. 4.3.3 Touch-tone dial 4.4 Characteristic of telephone ringer 4.4.1 Ringing power sensitivity The ringing power sensitivity of the telephone set shall not be greater than 100mVA. 4.6 Characteristics of telephone cord and handset cord 4.6.1 If socket is used for the terminals of telephone cord and handset cord, the plug used shall meet the requirements of YD/T 577. 4.7 Key “R” The telephone sets provided with key “R” shall be marked with word “R” clearly. After key “R” has been pressed, the interruption time of talking circuit shall be between 90ms-130ms. The off resistance in case key “R” functions shall not be less than 100kΩ. 4.8 Appearance and structure 4.9 Safety requirements 4.10 Environmental suitability of telephone set 4.11 Lightning resistance of telephone set The lightning resistance of telephone set shall meet the requirements of YD/T 993-1998. After going through the lightning resistance test specified in 5.20, the various functions shall remain normal. 4.12 Electromagnetic compatibility of telephone set The electromagnetic compatibility of telephone set shall meet the requirements of YD/T 968. 4.13 Functional requirements for telephone set 4.13.1 The functions specified in the operation instruction of telephone set shall be normal and meet he requirements of relevant specifications. 4.14 Reliability requirements for telephone set The mean time between failures (MTBF) of telephone set shall not be shorter than 5 000h.

5 Test methods

5.1 Test conditions 5.1.1 Test under normal conditions Unless otherwise specified, all the tests shall be carried out under the following normal conditions. 5.1.2 Feed bridge circuit used for testing purposes The feed bridge circuit is shown in Figure 5.In this figure, E is (48±1)V, C is (4±0.4)μF, L is composed of two groups of symmetrical coils. 5.1.3 Artificial user line network The artificial user line network per kilometer used for testing purposes shall be fabricated according to Figure 6 to simulate φ = 0.5mm core wire paper insulated cable. 5.1.5 Artificial mouth The artificial mouth shall have the following characteristics. 5.2 Testing of loudness rating 5.2.1 Test instruments and equipment The objective measuring apparatus used for the testing of loudness rating shall meet the requirements of ITU-T P.64 and ITU-T P.79. 5.2.2 Testing of sending loudness rating 5.2.4 Testing of side tone masking rating (STMR) 5.2.4.1 Measurement of sound pressure of mouth reference point (with respect to 1Pa/V) Carry out the measurement of sound pressure of mouth reference point (Pm) according to 5.2.2.1.The test frequency range shall be extended to 100Hz-8 000Hz. 5.5 Testing of nonlinear distortion of telephone set 5.5.1 Testing of sending nonlinear distortion 5.5.1.1 Connect the test circuit according to Figure 12.The sinusoidal signal generator emits sinusoidal signals of difference frequencies. The free field sound pressure of mouth reference point (Pm) is the same as in the measurement of sending sensitivity, i.e., -4.7dBPa. 5.5.2 Testing of receiving nonlinear distortion 5.5.2.1 Connect the test circuit according to Figure 13.The sinusoidal signal generator emits sinusoidal signals of difference frequencies. The level is the same as in the measurement of receiving sensitivity. The internal resistance of signal source is 600Ω. 5.6 Measurement of noise characteristic of telephone set 5.6.1 Measurement of sending noise Connect a 600Ω resistor to the output end of the telephone set and carry out the measurement according to Figure 14.Set the noise meter to input high impedance and calibrate it in dBV. The weighting coefficient of the noise meter shall meet the regulations of Table 1 of ITU-T suggestion 0.41.Under the condition that there’s no excitation sound pressure and the ambient noise is not greater than 40dB(A), measure the mean values of three cycles longer than 1s and take the minimum value. 5.7 Measurement of the maximum sound level in case of switching on and off of telephone set 5.7.1 Connect the circuit according to Figure 16. Figure 16 Measurement of the maximum sound level in case of switching on and off of telephone set 5.7.2 The feed bridge shall meet the regulations of 5.1.2. 5.8 Inspection of singing phenomenon of telephone set 5.8.1 Connect the test circuit according to Figure 17.In this figure, the telephone sets shall be of the same model and in off-hook power supply state, the supported telephone handset shall be put on the side.

6 Marking and packing

6.1 Marking 6.1.1 The telephone sets that have passed the tests shall be marked with the model, trademark, network access mark and date of production of the telephone set. 6.1.2 The contents marked on the packing box of each telephone set includes the model, name, trademark, name of manufacturing factory or company, color and executed standard of the telephone set. 6.1.3 The contents marked on the packing case of multiple telephone sets include. 6.2 Packing 6.2.1 The telephone sets shall be provided with general shock-proof and damp-proof packing. 6.2.2 The telephone sets packed in boxes shall be encased in packing cases with clear marks. The packing cases shall be provided with general shock-proof and damp-proof measures and packed reliably. ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.


      

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