This test method is based on the technical indicators specified in GB3376-82 "Single-frequency pulse line signal method in the telephone automatic switching network". The main test contents are: a. Signal generator technical indicators; b. Signal receiver technical indicators; c. Signal structure parameters; d. Split time. GB/T 5442-1985 Test method for technical indicators of single-frequency pulse line signal in the telephone automatic switching network GB/T5442-1985 standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
GB/T5442—1985
The test methods for the technical specifications of inbandpulsing single frequency linesignalling system forautomatic telephone switching networkPublished on October 30, 1985
National Bureau of Standards
Implementation on June 1, 1986
National Standard of the People's Republic of China
The test methods for the technical specifications of inbandpulsing single frequency linesignalling systemforautomatic telephone switching networkUDC 621.395.66
621.391.8
：621.317.08
GB/T5442—1985
This test method is based on the technical indicators specified in GB3376—1982 "Single-frequency pulse line signal method in the telephone automatic switching network band". The main test contents are:
a. Signal generator technical indicators;
b. Signal receiver technical indicators
c. Signal structure parameters;
Split time. www.bzxz.net
1 Signal generator technical indicator measurement
1.1 Indicators
a. The nominal value of the signal transmission frequency is 2600Hz, and the allowable deviation is ±5Hz. b. The absolute power level of the unmodulated signal output to the zero relative level point of the circuit is -8±1dBm. 1.2 Measurement method
1.2.1 Signal transmission frequency
The measurement method of the transmission frequency of the single-frequency pulse line signal generator is the same as the measurement method of the oscillation frequency of the ordinary sine wave signal. The measurement point can be selected according to the use conditions of the frequency measuring instrument used (such as the input signal level, etc.), and the reading error of the frequency measuring instrument used should not exceed ±1Hz.
1.2.2 Signal transmission level
Use the general direct reading method to measure. When measuring, a continuous signal should be sent in the office. The measurement point can be selected on the circuit side of the signal device. If the relative power level of the measurement point is Par, the measured unmodulated absolute power level is (-8 + P) ± 1dBm. When measuring, if the circuit side is in the disconnected state, the level meter should be measured in the 600Q impedance range. If the circuit side is not disconnected from the external line, it should be measured in the high impedance range (greater than 10kQ). 2 Signal receiver technical indicator measurement
2.1 Signal receiver action and non-action indicators 2.1.1 Indicators
a. Passband: 2600±15Hz.
b. Within the passband, if the relative power level between the signal receiver and the circuit connection point is 1dBr, the absolute power level M of the input signal is:
-20
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