GB/T 5443-1985 Test methods for technical indicators of ringing current and signal tone of automatic telephone exchange network
Some standard content:
National Standard of the People's Republic of China
GB/T5443—1985
Ringing current and signal tone for automatic telephone switching network
Technical specification test methods
The test methods for the technical specificationsof ringing andtoneforautomatictelephoneswitchingnetwork
Published on October 30, 1985
National Bureau of Standards
Implemented on June 1, 1986
National Standard of the People's Republic of China
Ringing current and signal tone for automatic telephone switching network
Technical specification test methods
The test methods for the technical specificationsof ringing and tone for automatictelephone switching network
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GB/T5443—1985
This test method is based on GB338082 "Telephone Automatic Switching Network Ring Current and Signal Tone", and is mainly applicable to vertical and horizontal (or quasi-electronic) switching offices. Test contents include:
a. Ring current voltage, frequency, harmonic distortion and intermittent time. b. Sending level, frequency, harmonic distortion and intermittent time of various signal tones. 1 Ring current technical index test
1.1 Technical index
a The ring current source is a 25±3Hz sine wave, the harmonic distortion is not more than 10%, and the output voltage effective value is 90±15V. Under full load conditions, the effective value of the ringing voltage measured on the 4.7kQ load at the called user terminal of the main distribution frame should not be less than 43V. b.: The ringing adopts 5s intermittent, that is, 1s for 4s off, and the deviation of the on and off time shall not exceed ±10%. 1.2 Measurement of the sending frequency of the ringing current source
The sending frequency of the ringing current source is measured by the measurement method of the oscillation frequency of the general sine wave signal generator. The instrument used for measuring the frequency should be able to measure the sine signal frequency of 10~100Hz, and the measurement error should not exceed ±0.1Hz. 1.3 Measurement of the output voltage and harmonic distortion of the ringing current source 1.3.1 Measurement method
The exchange office that has been opened for use should generally be measured during busy hours. When measuring, actually call a called user first, keep the called user in the ringing state, connect a 4.7kQ resistor (series DC blocking capacitor 20μF) at the called user terminal of the main distribution frame, and cut off the external line. Control the ringing intermittent logic circuit to make the ringing signal continuous, use the ringing current voltmeter and the distortion meter to measure the distortion and output voltage at the output end of the ringing current generator (point A in Figure 1), and use the ringing current voltmeter to measure the ringing current voltage at the main distribution frame (point B in Figure 1). See Figure 1 for the connection diagram. For the exchange that has not yet been put into use, full load and no-load measurements should be carried out. For the exchange that has been put into use, if necessary, full load and no-load measurements should be carried out when idle.
No-load measurement means that the distortion and output voltage are measured directly at the output end of the ringing current generator without any load using the distortion meter and the ringing current voltmeter.
Connect the station to simulate full load
Full load measurement, first actually call a user, keep the called party ringing, and cross the load at the output end of the ring current generator (as shown in the dotted line part of Figure 1), then connect a 4.7kQ resistor (with a 20μF DC blocking capacitor) at the terminal of the called user's distribution frame, cut off the outside line, control the ringing logic circuit to make the ringing signal continuous, and use a ringing current voltmeter to measure the ringing current voltage on the 4.7k load and the output end of the ringing current generator (point A in Figure 1). Use a distortion meter to measure the distortion at point A. Z is the equivalent load of each channel, which should include the load from the ringing current source to the main distribution frame (calculated according to the actual circuit) and the load from the main distribution frame to the user (calculated according to 3.4kQ pure resistance), and n is the maximum number of channels ringing at the same time, calculated according to the traffic theory. If the ringing generator has other loads besides ringing, they should also be considered. Issued by the National Bureau of Standards on October 30, 1985
Implemented on June 1, 1986
1.3.2 Requirements for instruments
GB/T5443—1985
(250 V)
10 -1μF
First point is
20 = 2μF
1,5c E
Ring current and voltage meter: It should be able to measure the effective value of the sine wave signal voltage of 15~50Hz, the measurement voltage range is 1~200V, the error does not exceed ±2%, and the input impedance should not be less than 100kQ (unbalanced). Distortion meter: frequency range is 15Hz~10kHz, distortion measurement range is 0.1%~100%, distortion accuracy is ±10%, and the input signal amplitude is allowed to be 1~200V.
1.4 Intermittent time measurement
The ringing intermittent time should be measured in the logic circuit that controls the intermittent. The selected time measurement instrument should be able to measure the pulse duration, the interval between various step pulses, etc. The measurement duration range is 10ms~10s, and the measurement error should not exceed ±1ms. The measurement should be connected according to the requirements of the selected instrument.
2 Signal tone technical indicator test
2.1 Technical indicators
2.1.1 The meaning and structure of various signal tones are shown in Table 1. 2.1.2 According to the type of signal tone, the signal tone source is a 450±25Hz or 950±50Hz sine wave, and the harmonic distortion is not more than 10%. 2.1.3 When sent to the frequency division or time division circuit, at the zero relative level point (sent to the solid line circuit and measured at the main distribution frame terminal 600Q), according to the type of signal tone, the level of the continuous signal tone is -10 ± 3dBm or -20 ± 3dBm (see Table 1). 2.1.4 The deviation of the intermittent time of various signal tones shall not exceed ± 10%. 2.2 Measurement of the sending frequency of the signal tone source
GB/T5443—1985
The sending frequency of various signal tone sources is measured using the universal sine wave signal generator oscillation frequency measurement method. The frequency measuring instrument used should be able to measure the sine signal frequency of 200Hz~3kHz. The measurement error should not exceed ± 1Hz. 2.3 Measurement of signal tone harmonic distortion
The harmonic distortion of the signal tone should be measured directly at the output end of the sound source (including power amplifier and other circuits) using a distortion meter during busy hours. The distortion meter used: frequency range 200~10kHz, distortion measurement range 0.1%100%, distortion accuracy ±10%, allowable input signal amplitude 500mV~100V. See Figure 2 for the connection diagram. Can be built-in telephone
etc.)
2.4 Signal tone transmission level measurement
2.4.1 The dial tone transmission level should be measured in the main distribution frame during busy and idle hours. When measuring, pick up the phone and call, and keep the calling user listening to the dial tone. Connect a 600Q resistor to the calling user terminal of the main distribution frame, disconnect the outside line, and measure with a high-impedance audio level meter. See Figure 3 for the connection diagram.
2.4.2 The signal tone that shares the same sound source with the dial tone and has the same transmission loss from the sound source to the main distribution frame, in principle, does not need to be measured separately.
2.4.3 The signal tones that do not share the same source as the dial tone, or share the same source but have different transmission losses from the source to the main distribution frame, should have their transmission levels measured separately.
The transmission level of the signal tones that are intermittent and controlled by the branch logic circuit should be measured separately during busy and idle hours. a.
Signal tone category
Dial tone
Ringback tone
Long-distance notification tone
Unavailable number tone
Queue waiting tone
Confirmation tone
Hang-up tone
GB/T5443—1985
Notify the calling user that he can dial
Indicates that the called user is in a ringing state
Indicates that the machine key is busy or the called user is busy in this connectionNotify the user who is on a local call that there is a long-distance callNotify the calling user that the called number is an unavailable number or a restricted numberUsed for connections with queuing performance to notify the calling user to wait for an answerConfirmation tone is sent and received by the operator of the station to confirm the correctness of the calling user's number
Sent by the measuring station to the user who has not hung up for a long time, notifying the user of the hanging rate HzwwW.bzxz.Net
450±25
950±50
Sending level
dBmo or dBm
—10±3
—20±3
—10±3
Continuous signal tone
GB/T5443—1985
5s intermittent signal tone, 1s send, 4s off
0.7s intermittent tone, 0.35s send, 0.35s offo.rs
1.2s intermittent signal tone with unequal intervals, 0.2s send, 0.2s off, 0.2 send, 0.6s off1.2s
0.24 0.2
1.4s intermittent signal tone with unequal intervals, repeated three times, 0.1s is sent, 0.4s is sent after 0.1s is disconnected, and 0.4s is disconnected
No special signal tone is set, and it is replaced by ringback tone or recorded notification when necessary
Continuous signal tone, the loudness change is divided into 5 levels, starting from the lowest level and gradually increasing
If the call is not answered for a long time, a busy tone is sent after 90s
In the step-by-step system, a busy tone can be sent when there is no empty number
GB/T5443—1985
The signal tone is measured in the main distribution frame, and the signal tone sent to the frequency division and time division circuits should be measured at a certain point in the sending direction. The point should be convenient for testing and its relative level should be known. When measuring, the state of sending the measured signal tone should be simulated first to make an actual call, and the state of sending the measured signal tone should be maintained and made continuous. Then, terminate the 600Q resistor at the measuring point, disconnect the external circuit, and use a high-impedance audio level meter to measure the signal tone level. b. The signal tone level of the sound source output signal, which is first controlled by the control signal to form an intermittent signal and then distributed to each channel, should be measured when the service is idle. First, make an actual call as described in item a, and measure the signal tone level of one channel continuously sent. Then, connect a Z load across the signal tone output end and continue to measure. See Figure 4 for the connection diagram. Z is a full-load simulated load. Each load should include the load from the sound source to the main distribution frame (calculated according to the actual circuit) and the load from the main distribution frame to the user (calculated according to 6002 pure resistance). The full load should be determined based on the type of sound signal provided by the measured sound source and the maximum number of channels for sending each type of signal tone at the same time according to the traffic theory. In the measurements of items a and b, for the signal tone sent to the frequency division or time division multiplexing circuit, assuming that the relative level of the measurement point is PaBr, and the level of the measured signal tone sent to the zero relative point specified in the indicator is PaBmo, then the signal tone level measured at the measurement point should be within the range of Pamo + Par ± 3dBm.
Electric %
Including dynamic, etc.
LU = LI-F
2.4.4 Requirements for the use of instruments
Audio level meter: It should be able to measure the level of sine wave signals above 200Hz~10kHz, with a sensitivity of -40~+30dB, high impedance, and balance.
2.5 Measurement of intermittent time of signal tone
The intermittent duration of the signal tone controlled by the branch logic circuit can be directly measured at the branch logic circuit. The output signal of the sound source is first controlled by the control signal to form an intermittent signal tone and then distributed to each channel. The duration of the intermittent control signal can be directly measured. The selected instrument for measuring time should be able to measure the duration of the pulse and the interval between various step pulses. The measurement duration range is 10ms~10s, and the measurement error should not exceed ±1ms.
GB/T5443—1985
Appendix A
Ring current voltage effective value output to the main distribution frame (reference)
GB338082 "Ring current and signal tone of telephone automatic switching network" stipulates that the effective value of the output voltage of the ring current source is 90±15V. At present, the circuit design of the ring current source to the main distribution frame of various switches is different, and the transmission loss is different, so the ring current voltage output to the main distribution frame is also different. In order to ensure the ringing sound level requirements for the called user, this test method standard adds the following provisions: The effective value of the ringing current voltage measured on the 4.7kQ load at the main distribution frame terminal should not be less than 43V. A.1GB1493—79 "Technical conditions for common power and automatic telephones" stipulates: "The ringing sound level should not be less than 70dB" and "The impedance in the ringing state should not be less than 3kQ at 25Hz".
A.2GB1492-79 "Telephone Test Method" stipulates: The ringing sound level is measured as shown below. Where E_2VPR (V), P is equal to 0.2W, R=Z/(Z is the ringing impedance of the phone).
& -tar
A.3 The ringing signal is sent from the exchange to the phone, then R is the user line loop resistance. In order to ensure that the phone gets 0.2W of ringing power, the main distribution frame ringing signal power should be:
P-I2R+0.2
where I is the ringing current. Obviously, when I and R are the maximum, the ringing signal power P required by the main distribution frame is the maximum. Because the minimum ringing impedance of the phone is 3k2, the maximum current:
V3X103
The maximum user line loop resistance is 17002. Therefore, the ringing voltage of the main distribution frame should be: U=Im(R+Zal)
X(1700+3000)
/3×103
That is, the effective value of the ringing voltage measured on the 4.7kQ load (main distribution frame) should be above 38.4V. After leaving a certain margin, it is stipulated that the effective value of the ringing voltage measured on the 4.7kQ load at the terminal of the main distribution frame should not be less than 43V. 7
Additional instructions:
GB/T5443—1985
This standard was proposed by the Ministry of Posts and Telecommunications of the People's Republic of China and is under the jurisdiction of the Telecommunications Transmission Research Institute of the Ministry of Posts and Telecommunications. This standard was drafted by the Telecommunications Transmission Research Institute of the Ministry of Posts and Telecommunications and the 738th Factory of the Ministry of Electronics Industry. The main drafters of this standard are Huang Shiliang, He Guopai and Li Tiancai.4 Instrument requirements
Audio level meter: It should be able to measure the sine wave signal level above 200Hz~10kHz, with a sensitivity of -40~+30dB, high impedance, and balanced.
2.5 Signal tone intermittent time measurement
The intermittent duration of the signal tone controlled by the shunt logic circuit can be directly measured at the shunt logic circuit. The output signal of the sound source is first controlled by the control signal to form an intermittent signal tone and then distributed to each channel. The duration of the intermittent control signal can be directly measured. The instrument selected for measuring time should be able to measure the duration of the pulse and the interval between various step pulses. The measurement duration range is 10ms~10s, and the measurement error should not exceed ±1ms.
GB/T5443—1985
Appendix A
Ring current voltage effective value output to the main distribution frame (reference)
GB338082 "Ring current and signal tone of telephone automatic switching network" stipulates that the effective value of the output voltage of the ring current source is 90±15V. At present, the circuit design of the ring current source to the main distribution frame of various switches is different, and the transmission loss is different, so the ring current voltage output to the main distribution frame is also different. In order to ensure the ringing sound level requirements for the called user, this test method standard adds the following provisions: The effective value of the ringing current voltage measured on the 4.7kQ load at the main distribution frame terminal should not be less than 43V. A.1GB1493—79 "Technical conditions for common power and automatic telephones" stipulates: "The ringing sound level should not be less than 70dB" and "The impedance in the ringing state should not be less than 3kQ at 25Hz".
A.2GB1492-79 "Telephone Test Method" stipulates: The ringing sound level is measured as shown below. Where E_2VPR (V), P is equal to 0.2W, R=Z/(Z is the ringing impedance of the phone).
& -tar
A.3 The ringing signal is sent from the exchange to the phone, then R is the user line loop resistance. In order to ensure that the phone gets 0.2W of ringing power, the main distribution frame ringing signal power should be:
P-I2R+0.2
where I is the ringing current. Obviously, when I and R are the maximum, the ringing signal power P required by the main distribution frame is the maximum. Because the minimum ringing impedance of the phone is 3k2, the maximum current:
V3X103
The maximum user line loop resistance is 17002. Therefore, the ringing voltage of the main distribution frame should be: U=Im(R+Zal)
X(1700+3000)
/3×103
That is, the effective value of the ringing voltage measured on the 4.7kQ load (main distribution frame) should be above 38.4V. After leaving a certain margin, it is stipulated that the effective value of the ringing voltage measured on the 4.7kQ load at the terminal of the main distribution frame should not be less than 43V. 7
Additional instructions:
GB/T5443—1985
This standard was proposed by the Ministry of Posts and Telecommunications of the People's Republic of China and is under the jurisdiction of the Telecommunications Transmission Research Institute of the Ministry of Posts and Telecommunications. This standard was drafted by the Telecommunications Transmission Research Institute of the Ministry of Posts and Telecommunications and the 738th Factory of the Ministry of Electronics Industry. The main drafters of this standard are Huang Shiliang, He Guopai and Li Tiancai.4 Instrument requirements
Audio level meter: It should be able to measure the sine wave signal level above 200Hz~10kHz, with a sensitivity of -40~+30dB, high impedance, and balanced.
2.5 Signal tone intermittent time measurement
The intermittent duration of the signal tone controlled by the shunt logic circuit can be directly measured at the shunt logic circuit. The output signal of the sound source is first controlled by the control signal to form an intermittent signal tone and then distributed to each channel. The duration of the intermittent control signal can be directly measured. The instrument selected for measuring time should be able to measure the duration of the pulse and the interval between various step pulses. The measurement duration range is 10ms~10s, and the measurement error should not exceed ±1ms.
GB/T5443—1985
Appendix A
Ring current voltage effective value output to the main distribution frame (reference)
GB338082 "Ring current and signal tone of telephone automatic switching network" stipulates that the effective value of the output voltage of the ring current source is 90±15V. At present, the circuit design of the ring current source to the main distribution frame of various switches is different, and the transmission loss is different, so the ring current voltage output to the main distribution frame is also different. In order to ensure the ringing sound level requirements for the called user, this test method standard adds the following provisions: The effective value of the ringing current voltage measured on the 4.7kQ load at the main distribution frame terminal should not be less than 43V. A.1GB1493—79 "Technical conditions for common power and automatic telephones" stipulates: "The ringing sound level should not be less than 70dB" and "The impedance in the ringing state should not be less than 3kQ at 25Hz".
A.2GB1492-79 "Telephone Test Method" stipulates: The ringing sound level is measured as shown below. Where E_2VPR (V), P is equal to 0.2W, R=Z/(Z is the ringing impedance of the phone).
& -tar
A.3 The ringing signal is sent from the exchange to the phone, then R is the user line loop resistance. In order to ensure that the phone gets 0.2W of ringing power, the main distribution frame ringing signal power should be:
P-I2R+0.2
where I is the ringing current. Obviously, when I and R are the maximum, the ringing signal power P required by the main distribution frame is the maximum. Because the minimum ringing impedance of the phone is 3k2, the maximum current:
V3X103
The maximum user line loop resistance is 17002. Therefore, the ringing voltage of the main distribution frame should be: U=Im(R+Zal)
X(1700+3000)
/3×103
That is, the effective value of the ringing voltage measured on the 4.7kQ load (main distribution frame) should be above 38.4V. After leaving a certain margin, it is stipulated that the effective value of the ringing voltage measured on the 4.7kQ load at the terminal of the main distribution frame should not be less than 43V. 7
Additional instructions:
GB/T5443—1985
This standard was proposed by the Ministry of Posts and Telecommunications of the People's Republic of China and is under the jurisdiction of the Telecommunications Transmission Research Institute of the Ministry of Posts and Telecommunications. This standard was drafted by the Telecommunications Transmission Research Institute of the Ministry of Posts and Telecommunications and the 738th Factory of the Ministry of Electronics Industry. The main drafters of this standard are Huang Shiliang, He Guopai and Li Tiancai.
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