This standard specifies the technical requirements, test methods, reliability tests, marking, packaging and other requirements for fixed automatic telephones. This standard applies to pulse and dual-tone multi-frequency handset telephones connected to the public network analog interface. Other multi-function terminals with handset functions can also be used as a reference, but other functions not specified in this standard must be tested as required in accordance with relevant standards. GB/T 15279-2002 Technical Requirements for Automatic Telephones GB/T15279-2002 Standard Download Decompression Password: www.bzxz.net

ICS33.050.10
National Standard of the People's Republic of China
GB/T 15279—2002
Replaces G3/T15279—1994
Technical Specifications of Automatic Telephone
The specifications of automatic telephone set2002-07-18 Issued
People's Republic of China
General Administration of Quality Supervision, Inspection and Quarantine
2002-12-01 Implementation
1 Specification
2 Normative Reference Documents
3 Terms and Symbols
3.1 Terms and Symbols
3.2 Graphic Symbols
4 Technical Requirements
Conditions of Use
Call Transmission Characteristics
Dialing Characteristics of Telephone Sets
Telephone Ring Characteristics
Telephone Hook Characteristics
Telephone Cord and Handle Cord Characteristics
"R\ Key
Appearance, Structure
Safety Requirements
Adaptability of Telephone Sets to Environment
Lightning Resistance of Telephone Sets ·
Electromagnetic compatibility performance of telephones
Functional requirements of telephones…
Reliability requirements of telephones··
5 Test force method
Test conditions
Test of heat rating value
Test of telephone frequency response
Test of telephone amplitude characteristics.
Test of telephone nonlinear distortion
Measurement of telephone noise characteristics·
Measurement of maximum sound level of telephone when power is on and off Check of telephone ringing·*
Test of DC resistance of telephone in unplugged state. Test of leakage current of telephone in on-hook state
Test of stable balanced return loss and echo balance loss Test of telephone dialing characteristics
Test of telephone ringing characteristics
GH/T 15279—2002
GB/T 15279—2002
Life test
Characteristic test of telephone cord and hand cord
Test of “R” key action time and disconnect switchInstallation process and surface quality
Telephone safety performance test
Basic environmental adaptability test
Lightning strike test of telephone
Electromagnetic compatibility test
Functional inspection of telephone
6 Marking. Packaging
Marking·
Appendix A (Normative Appendix) Reliability test (Test of mean trouble-free working time of telephone) A.1
Test plan|| tt||Test timebZxz.net
A.3 Test requirements
Requirements for test telephones
A.3.2 Test conditions
A.3.3 Test methods
A.4 Failure criteria
A.5 Failure analysis and repair
GB/T15279—2002
CB/T15279 is the basic standard for automatic telephones and the basis for formulating standards for analog telephones with other functions. The revision of this standard refers to the relevant suggestions of IIU-T and some typical foreign telephone standards, but the overall standard does not directly correspond to the corresponding international standards.
This standard is a revision of GB/T15279-1994 "Technical conditions for automatic telephones", and will replace GB/T15279-1994 from the date of implementation. Compared with the 1004 version, this standard has the following major revisions: except for the contents related to carbon microphone telephones (4.2.4, 4.2.5.5.1.6 and 5.5.3 in the 1994 version); except for the technical indicators of rapid pulse (20 pulses/second) pressing in the pulse dialing mode (Table 4 in the 1994 version); except for the requirements and measurement methods of the rotary dial (4.3.3, 4.3.5 and 5.11.10 in the 1994 version); except for the recommended size of the motor handle (1991 4.8 of the 1994 edition of the standard); one volume except Chapter 6 "Test Rules" of the 1994 edition of the standard; one volume except Chapter 8 "Reliability Test" of the 1994 edition of the standard, which is changed into the normative appendix of this standard (Chapter 8 of the 1994 edition of the standard, Appendix A of this standard):
Modify the requirements for the send loudness rating (SLR), receive loudness rating (RLR), and sidetone masking rating (STMR) (Table 1 of the 1994 edition of the standard, Table 1 of this edition of the standard); Supplement "Basic requirements for artificial ears and artificial mouths for testing (5.1.5 and 5.1.5 of this edition of the standard .6): Modified the requirements for amplitude characteristics, and proposed the requirements for amplitude characteristics of transmission and reception and the corresponding test methods (4.2.1 and 5.1 of the 1994 edition; 4.2.4 and 5.1 of this edition); - Modified the requirements for nonlinear distortion of telephone sets, and added the distortion index and the corresponding test method for the transmission and reception excitation levels to be increased by 10dB compared with the normal test values ​​(4.2.5 and 5.5 of the 1994 edition and 4.2.5 and 5.5 of this edition); Modified the DC attachment in the off-hook state (4.2.8 of the 1994 edition; 4.2.9 of this edition); Modified the "Echo Balance Return Loss" Calculation formula and test method for balanced return loss (Formula (12) of the 1994 edition: Formula (11) of this edition);
Added the index requirements and measurement methods for sending and receiving noise (4.2.7 and 5.6 of this edition) 3 - Modified the lightning protection requirements and directly used YD/T993-1998 Technical requirements and experimental methods for protection of telecommunication terminal equipment (4.13 of the 1994 edition; 4.11 and 5.20 of this edition); - Modified the electromagnetic compatibility limits and test methods and directly quoted YD/T968 "Limits and test methods for electric and combustion compatibility of telecommunication terminal equipment" (4 of the 1994 edition) .14 ​​and 5.22; 4, 12 and 5.21 of this edition); revised the reliability requirements (1.15 of the 1991 edition and 4.14 of this edition); - Reference YLD)/T720-1998 Telephone Inspection Procedure to standardize the relevant test methods (Appendix A of the 1994 edition of this standard is a normative appendix.
This standard was proposed by the Ministry of Information Industry of the People's Republic of China. This standard is under the jurisdiction of the Telecommunications Research Institute of the Ministry of Information Industry. The drafting units of this standard are: Telecommunications Transmission Research Institute of the Ministry of Information Industry, Guangdong BBK Electronics Industry Co., Ltd., Shenzhen Taifeng Communication Electronics Co., Ltd., and TCL Communication Equipment Co., Ltd. The main drafters of this standard are: Shi Denian, He Jianqiang, Jiang Jingxin, and He Li. This standard is entrusted to the Telecommunications Transmission Research Institute of the Ministry of Information Industry for interpretation. This standard was first issued in December 1994, and this is the first revision. 1 Scope
Technical conditions for automatic telephones
GB/T 15279—2002
This standard specifies the technical requirements, test methods, reliability tests, marking, and packaging requirements for fixed automatic telephones. This standard is applicable to pulse and dual-tone frequency handset telephones connected to the public network analog interface. Other multi-function terminals with handset functions can also be used for reference. However, other functions not specified in this standard need to be tested in accordance with the requirements of relevant standards. 2 Normative references
The clauses in the following documents become the clauses of this standard through the use of this standard. For all dated references, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, parties to an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For any undated referenced document, the latest version shall apply to this standard. GB/I2423.1 Environmental testing for electrical and electronic products Part 2: Test methods Test A: Low temperature (idtTFC.60068-2-1:1990) GB/I2423.2 Environmental testing for electrical and electronic products Part 2: Test methods Test B: High temperature (idtIFC:60068-2-2:1974) GB/T2423.3 Basic environmental testing procedures for electrical and electronic products Test Ca: Steady state damp heat test method (eVIEC60068-2-3:1984) GB/T2423.6 60068 2 21:1987)
Environmental testing for electric and electronic products Part 2, Test method Test Eb and guidance: Collision (idtIEC GB/T2423.8 Environmental testing for electric and electronic products Part 2: Test force method Test Ed: White drop (idllIEC60068-2-32:1990)
GB/T2423.10 Electric.「Environmental testing for electronic products - Part 2: Test methods - Test Fc and guidelines: Vibration (sinusoidal) (idIEC60068-2-6.1982)
GB/T2828 Batch inspection - Sampling procedure and sampling table (applicable to continuous batch inspection) G13/13873--1983 General technical conditions for packaging of communication equipment products GB/T15296.1-1997 General instructions for use of consumer products GI3/T11016.1-11016.4 Plastic insulated and rubber insulated telephone cords GB/T18031-2000 Information technology - General requirements for Chinese character input on numeric keyboards YD/T577-1992 Indoor telephone plug sockets YD/T965--1998 Safety requirements and test methods for telecommunication terminal equipment YL>/T968 Limits and test methods for electromagnetic compatibility of telecommunication terminal equipment YD/T993-1998 Technical requirements and test methods for lightning protection of telecommunication terminal equipment [TL-T P.64 Measurement of the sensitivity of local telephone systems ITL-TP.79 Calculation of telephone loudness rating values ​​3 Terms and symbols
3.1 Terms and symbols
LR—loudness rating value:
SLR transmit loudness rating value;
GB/T15279--2002
—receive loudness rating value;
sidetone masking rating value;
LRGP…loudness rating value guard ring position; S
transmit sensitivity measured by objective measurement method: receive sensitivity measured by objective measurement method: receive sensitivity measured by actual human ear: sidetone sensitivity measured by objective measurement method; • Correction values ​​for taking into account the sound leakage between the telephone receiver and the person +Ws.Wa and Wm-
are used to calculate SLR, RLR and STMR respectively Weighting coefficient of balanced return loss:
Stable balanced return loss,
Constant balanced return loss +
MTBF.
3.2 Graphic symbols
Audio oscillator
Source rate attenuation
Amplifier
First current medium voltage meter
AC small meter
Electric power supply in abnormal state
Frequency meter
Digital display
AC current meter
Direct current power supply meter
Real line
Adjustable simulation line
Telephone in off-hook state
4 Technical requirements
4. 1 Conditions of use
Sound level meter (A-weighted)
a) Ambient temperature: -10℃-+40℃,
b) Relative humidity: 10%~95%;
t) Ambient noise: 60 d(A)1
d) Atmospheric pressure.86kFa1o6kPa:
4.2 Call transmission characteristics
4.2.1 Loudness rating value
First-class model
GB/T 15279—2002
Noise meter
The telephone is connected to the analog telephone network test system, and its sending, receiving loudness rating values ​​and side masking rating values ​​shall comply with the requirements of Table 1. Table 1 Loudness rating value
Buffer length
Transmit loudness rating (SLR)
Receive loudness rating (RLR)
Sidetone masking rating (STMR)
4.2.2 Transmit frequency response
Unit is dI3
Under the condition of 0km user line, the typical curve of the transmit frequency response (dashed line in Figure 1) and its allowable range (solid line in Figure 1) are shown in Figure 1.
Relative sound level: dB
Upper limit of charging difference
12dp/oct2
F-17dB
Lower limit of dead season
26 8/oct
20o03o400o5mo8nox
GB/T 15279-2002
4.2.3 Receiving frequency response
Under the condition of 0km user line, the typical curve of receiving frequency response (dashed line in Figure 2) and its tolerance range (solid line in Figure 2) are shown in Figure 2.
Phase sound level:
Upper limit of differential pressure 1
12 dB/oct
+5.5 dB
200300
4.2.4 Amplitude characteristics (change of sound level with input level) 4.2.4.1 Sending amplitude characteristics
Lower limit of differential pressure 1
22dRfoct
20003000 405000
8000H2
When the excitation sound pressure is -4.7dBPa and decreases by 15dB, the change of the transmission loudness rating value (SI.R) should not be greater than -+±2dls. 4.2.4.2 Receiving amplitude characteristics
When the input open circuit voltage H12dBV decreases by 15dB, the change of the receiving loudness rating value (RIR) should not be greater than ±2dB. 4.2.5 Nonlinear distortion
4.2. 5. 1 Transmitting nonlinear distortion
a) When the excitation sound pressure is -4.7lBPa and the fundamental frequency range is a single frequency signal of 30 Hz~-1000 Hz, the nonlinear distortion of the transmission output should not be greater than 7%.
b) When the excitation sound pressure increases by 1dB and the fundamental frequency is 1 000H, the nonlinear distortion of the transmission output should not be greater than 10%. 4.2.5.2 Receiving nonlinear distortion
a) When the input open circuit voltage is: 12dBV, the fundamental frequency range is 300Hz--1000Hz, the nonlinear distortion of the sound signal output by the receiver should not be greater than 7% b) When the input open circuit voltage increases by 10 lB, the fundamental frequency is 1000 Hz, the nonlinear distortion of the sound signal output by the receiver should not be greater than 10%.
4.2.6 Maximum sound level when the phone is powered on and off
The maximum sound level when the phone is powered on and off should not be greater than 125clB (A). 4.2.7 Noise characteristics
4.2.7.1 The sending noise should not be greater than -60dBVp4.2.7.2 The receiving noise should not be greater than -49 d3Pa, 4.2.8 There should be no humming phenomenon when the phone is in normal use. 4-2.9 The DC resistance of the telephone in the off-hook state shall not exceed 3504.2.10 The leakage current of the telephone in the on-hook state shall not exceed 25 mA. 4.2.11 In the frequency range of 300 Hz to 3 400 Hz, the AC impedance of the telephone in the call state shall comply with the requirements of Table 2 relative to the stable balanced return loss and echo balanced loss of the balanced network 4 shown in Figure 3, R
C-(10015)nF;R.=(200-2)2:R:=(680=7)Figure 3
Table 2 Impedance in the active state
User line length
Stable balanced loss
Echo balanced loss
4.3 Dialing characteristics of the telephone
4.3.1 DC pulse signal characteristics
GB/T15279—2002
The unit is
a) The number of self-current pulses emitted by the telephone shall correspond to the digits of the operated number, where \α\ corresponds to 1U pulses. b) The pulse rate, on-off ratio and time interval between two adjacent pulses when issuing a number should meet the requirements of Table 3. c) The on resistance of the telephone when issuing a number should not be greater than 350, and the off resistance should not be less than 100kΩ. Table 3 Pulse signaling characteristics of telephone sets
Pulse rate/s-
Pulse-to-break ratio
Time interval between two adjacent pulses/ms
4.3.2 Dual-tone multi-frequency signal characteristics
4.3.2.1 Frequency combination
1. 5±:1 : 1 or 2+0. 2 : 1
The nominal frequency combination corresponding to the numbers and symbols on the dial is shown in Table 4, where the "*" key and the \ key are used as function keys, and A, B, C, and D are spare keys.
Table 4 Frequency combination of dual-tone multi-frequency signals
Numbers and symbols
Frequency of high frequency group/Hz
Low frequency group
4. 3.2.2 Frequency Deviation
In dual-tone multi-frequency signal, the deviation of a single frequency shall be within the range of ±1.5% of the nominal frequency: 4.3.2. 3 Signal Level
In dual-tone multi-frequency signal, the level of a single frequency is shown in Table 5. 1477
GB/T15279—2002
Bad Path Current
High Frequency Group
Low Frequency Group
4.3.2.4 Level Difference of High and Low Frequency Groups
Table 5 Level of dual-tone multi-frequency signal
In any frequency combination, the high frequency component level shall be 2±1B higher than the low frequency component level: 4.3.2.5 Signal duration
Unit: dBn
When the telephone is making a call, after the dual-tone multi-frequency signal level reaches 90% of the stable value, the signal duration should be no less than 4015, and the time interval between two sets of adjacent dual-tone multi-frequency signals should be no less than]cm5. 4.3.2-6 Unwanted signal power level
When the telephone is making a call, the total power level of the useless frequency components in the output signal should be at least 20 dB lower than the power level of the low-frequency components in the dual-tone multi-frequency signal.
4.3.2.7 Single-frequency signal level when the telephone is not making a call When the telephone is not making a call, the level of each single-frequency signal of the dual-tone multi-frequency signal at the output end of the telephone is not greater than -70dBm. 4.3.2.8 Voice suppression capability
When the telephone is making a call, the voice level sent from the transmitter should be attenuated by more than 60dB. 4.3.2.9 Feedback Tone
When the telephone is sending a number, the orange tone of the receiver should be at 65
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