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GB/T 15279-2002 English PDF (GBT15279-2002)

GB/T 15279-2002 English PDF (GBT15279-2002)

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

This Standard specifies the technical requirements, test methods, reliability test, marking and packing for fixed automatic telephone sets.
GB/T 15279-2002
GB
ICS 33.050.10
M 40
NATIONAL STANDARD
OF THE PEOPLE REPUBLIC OF CHINA
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 Republic of China;
Standardization Administration of the PEOPLE Republic of
China.
Table of Contents
FOREWORD ... 4
1 SCOPE ... 6
2 NORMATIVE REFERENCES ... 6
3 TERMS AND SYMBOLS ... 7
3.1 TERMS AND SYMBOLS ... 7
3.2 GRAPHIC SYMBOLS ... 8
4 TECHNICAL REQUIREMENTS ... 9
4.1 SERVICE CONDITIONS ... 9
4.2 CALL TRANSFER CHARACTERISTIC ... 9
4.3 DIALING CHARACTERISTIC OF TELEPHONE SET ... 12
4.4 CHARACTERISTIC OF TELEPHONE RINGER ... 15
4.5 CHARACTERISTIC OF TELEPHONE HOOK SWITCH ... 15
4.6 CHARACTERISTICS OF TELEPHONE CORD AND HANDSET CORD ... 15
4.7 KEY ?€?R?€?... 16
4.8 APPEARANCE AND STRUCTURE ... 16
4.9 SAFETY REQUIREMENTS ... 16
4.10 ENVIRONMENTAL SUITABILITY OF TELEPHONE SET ... 16
4.11 LIGHTNING RESISTANCE OF TELEPHONE SET ... 17
4.12 ELECTROMAGNETIC COMPATIBILITY OF TELEPHONE SET ... 17
4.13 FUNCTIONAL REQUIREMENTS FOR TELEPHONE SET ... 18
4.14 RELIABILITY REQUIREMENTS FOR TELEPHONE SET ... 18
5 TEST METHODS ... 18
5.1 TEST CONDITIONS ... 18
5.2 TESTING OF LOUDNESS RATING ... 22
5.3 TESTING OF FREQUENCY RESPONSE OF TELEPHONE SET ... 27
5.4 TESTING OF AMPLITUDE CHARACTERISTIC OF TELEPHONE SET ... 27
5.5 TESTING OF NONLINEAR DISTORTION OF TELEPHONE SET ... 27
5.6 MEASUREMENT OF NOISE CHARACTERISTIC OF TELEPHONE SET ... 29
5.7 MEASUREMENT OF THE MAXIMUM SOUND LEVEL IN CASE OF SWITCHING ON AND OFF OF TELEPHONE SET ... 30
5.8 INSPECTION OF SINGING PHENOMENON OF TELEPHONE SET ... 30
5.9 TESTING OF DC RESISTANCE OF TELEPHONE SET IN TAKE-UP STATE ... 31
5.10 TESTING OF LEAKAGE CURRENT OF TELEPHONE SET IN HANG-UP STATE ... 31 5.11 TESTING OF STABLE BALANCE RETURN LOSS AND ECHO BALANCE RETURN LOSS .. 32 5.12 TESTING OF DIALING CHARACTERISTIC OF TELEPHONE SET... 33
5.13 TESTING OF RINGING CHARACTERISTIC OF TELEPHONE SET ... 38
5.14 LIFE TEST ... 40
5.15 TESTING OF CHARACTERISTICS OF TELEPHONE CORD AND HANDSET CORD ... 41 5.16 TESTING OF ACTUATION DURATION AND OFF RESISTANCE OF KEY ?€?R?€? ... 41 5.17 INSTALLATION PROCESS AND SURFACE QUALITY ... 42
5.18 TESTING OF SAFETY PERFORMANCE OF TELEPHONE SET ... 42
5.19 BASIC ENVIRONMENTAL SUITABILITY TEST ... 43
5.20 LIGHTNING RESISTANCE TEST OF TELEPHONE SET ... 45
5.21 ELECTROMAGNETIC COMPATIBILITY TEST ... 49
5.22 FUNCTIONAL INSPECTION OF TELEPHONE SET ... 49
6 MARKING AND PACKING ... 49
6.1 MARKING ... 49
6.2 PACKING ... 50
ANNEX A (NORMATIVE) RELIABILITY TEST (TEST OF MEAN TIME BETWEEN
FAILURES OF TELEPHONE SET) ... 51
A.1 TEST SCHEME ... 51
A.2 TEST DURATION ... 51
A.3 TEST REQUIREMENTS ... 52
A.3.1 REQUIREMENTS FOR TEST TELEPHONES ... 52
A.3.2 TEST CONDITIONS ... 52
A.3.3 TEST METHOD ... 52
A.4 FAILURE CRITERIA ... 52
A.5 FAILURE ANALYSIS AND MAINTENANCE ... 53
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 The specifications of automatic telephone set
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 ...

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