This standard specifies the general requirements for dual-tone multi-frequency key telephones. This standard applies to ordinary dual-tone multi-frequency key telephones (hereinafter referred to as telephones). GB/T 9034-1988 Technical requirements for dual-tone multi-frequency key telephones GB/T9034-1988 Standard download decompression password: www.bzxz.net

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Technical requirements of
pushbutton telephone with DTMF This standard specifies general requirements for pushbutton telephones with DTMF. This standard applies to ordinary pushbutton telephones with DTMF (hereinafter referred to as telephones). Environmental conditions for use:
Temperature: -10～40℃
Relative humidity: 45%～95%
Air pressure: 86~～106kPa
Noise: not more than 60dB(A)
1 Transmission characteristics
GB 903488
1.1 The telephone is connected to the analog telephone network test system, and its sending, receiving and side tone reference equivalents shall meet the requirements of Table 1. Table 1
Phone type
Simulated user line length
Objective transmission reference equivalent
Objective reception reference equivalent
Objective side tone reference equivalent
Phone that meets both A and B requirements is type C. The phone should have a type mark. 3km
1.2 The transmission frequency response and reception frequency response of the phone should meet the requirements of GB6362 "Frequency Response of Telephones". 1.3 Transmission amplitude characteristics of the phone:
1.3.1 When the excitation sound pressure increases from -10dB to 0dB, the difference in the meter readings |ZF,I≥9dB. 1.3.2 When the excitation sound pressure increases from 0dB to +10dB, the difference in the meter readings ZF1≥7dB. 1.4 Nonlinear distortion or modulation noise voltage of telephone: 13
1.4.1 For telephones using linear transmitters, the transmission nonlinear distortion should not be greater than 7%; the reception nonlinear distortion should not be greater than 7%. d3
1.4.2 For telephones using carbon particle transmitters, the transmission modulation noise voltage should not be greater than 20mV; the reception nonlinear distortion should not be greater than 7%. 1.5 The maximum sound level of the telephone when it is powered on and off should not be greater than 110dB (A). 1.6 There should be no humming when the telephone is in normal use.
1.7 For telephones used in digital exchanges, the impedance of the telephone in the call state should be within the frequency range of 300~3400Hz, and the stable return loss and echo loss relative to the balanced test network should meet the requirements of Table 2. The balanced test network is shown in Figure 1. Note: 1) It is recommended that the real part of the telephone impedance can be selected within the range of 400~7000, and the imaginary part can be selected within the range of 0~300α. Approved by the Ministry of Electronics Industry of the People's Republic of China on March 2, 1988, implemented on October 1, 1988
Stable balanced return loss
Echo balanced return loss
2. Receive ring characteristics
GB 9034-—
Short term (until December 31, 1990)
2.1 Receive ring power sensitivity should not be greater than 80mVA. 2.2 Receive ring level should not be less than 70dB(A). Long term (from January 1, 1991)
2.3 For telephones with ring tone adjustment devices, the receive ring level at the low ring tone position should not be less than 55dB(A). 2.4 The impedance in the receive ring state should not be less than 3k2.3 DC characteristics
3.1 The DC resistance of the telephone in the hands-free state should not be greater than 3000. Assume that when the "R key is pressed, the DC resistance of the telephone is allowed to increase by 50α3.2 The leakage current of the telephone in the on-hook state should not be greater than 5μA. 4. The keyboard of the dial should meet the requirements of 1 in GB9035 "Technical requirements for dual-tone multi-frequency key dials for telephones". When the key stroke is less than 1mm, there should be a key indication.
4.2 The frequency combination, frequency tolerance and level of the dual-tone multi-frequency signal of the dial should meet the requirements of Article 2.1 of GB9035. 4.3 When sending a number, the signal duration and the time interval between two adjacent groups of dual-tone multi-frequency signals should meet the requirements of Article 2.2 of GB9035. 4.4 When sending a number, the total power level of the useless frequency components in the signal should meet the requirements of Article 2.3 of GB9035. 4.5 When not sending a number, the level of the dual-tone multi-frequency signal should Meet the requirements of Article 2.4 of GB9035. 4.6 The voice transmission level of the telephone should be attenuated by more than 60dB when making a number. 4.7
When making a number, the sound level of the telephone feedback sound should be in the range of 65-~85dB. After each key of the dial is used 5×105 times, it should meet the requirements of Article 4.2. 5 "R\ key
5.1 For a telephone with an "R" key, the "R\ key" should be located at an appropriate position outside the arrangement of the dial keys, and should meet the requirements of Articles 1.6 and 1.7 of GB9035.
5.2 When the "R" key is in action, the interruption time of the inquiry should be 90±40ms; the disconnection resistance should be no less than 100k2. 6 Safety
6.1 Under normal atmospheric conditions, the telephone can withstand a positive frequency of 50Hz and an effective value of 500V. There should be no arcing or breakdown when the string AC voltage is applied for 1 minute.
GB9034—88
6.2 The insulation resistance of the telephone under normal atmospheric conditions should be no less than 50Mα. 7 Basic environmental adaptability
7.1 When the telephone is at a low temperature of -10℃ and a high temperature of 40℃, its objective sending and receiving reference equivalents are allowed to deviate from the index by 3d13. And it should meet the requirements of Articles 2.2, 4.2 and Chapter 9.
7.2 After being stored at -40℃ and 55℃ and restored under normal atmospheric conditions, the telephone should meet the requirements of Articles 1.1, 2.2, 4.2 and Chapter 9.
7.3 After the telephone is subjected to sweep vibration in the frequency range of 10~55Hz and the displacement amplitude of 0.35mm, there should be no mechanical damage and structural looseness. 7.4 After the phone is hit by a peak acceleration of 100m/s and a pulse duration of 16ms, there should be no mechanical damage and structural looseness, and it should meet the requirements of the objective transmission and reception reference equivalents in Article 1.1 and Article 2.2, 4.2, and Chapter 9. 7.5 When the temperature is 40C and the relative humidity is 90%~95%, the objective transmission and reception reference equivalents of the phone are allowed to deviate from the index by 3d13, and the insulation resistance should be no less than 5MQ, and it should meet the requirements of 2.2, Article 1.2, and Chapter 9. 7.6 After the phone falls freely from a height of 1000mm onto a concrete or steel surface, it should be able to talk and receive normally, and the shell and handle should have no cracks and meet the requirements of Article 4.2.
8 Fork spring
8.1 The ratio of the handle weight (including the handset) to the fork spring starting pressure should be greater than 1.5:1. 8.2 After 200,000 operations, the telephone fork spring should meet the objective sending and receiving reference equivalents in Article 1.1 and the requirements of Articles 2.2 and 4.2. 9 Surface quality
The surface of the telephone housing and handle should be free of damage and scars, and the metal parts and components should be free of scars, cracks and rust. 10 Telephone cord
The life of the telephone cord is specified in the product technical conditions. 11 Reliability
The mean time between failures (MTBF) of the telephone should not be less than 3000h. Additional notes:
This standard is under the jurisdiction of the Standardization Institute of the Ministry of Electronics Industry. This standard was drafted by Shanghai Telecommunications Equipment Factory and the Telecommunications Transmission Institute of the Ministry of Posts and Telecommunications. f9
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