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Comprehensive test device for analog interface in telephone exchange

A telephone exchange and analog interface technology, applied in the field of telephone exchange analog interface comprehensive testing devices, can solve the problems of increased circuit cost and complexity, inconvenient use, large volume of audio coils, etc.

Inactive Publication Date: 2003-07-23
BEIJING JIAXUN FEIHONG ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above methods ① and ② will undoubtedly increase the cost and complexity of the circuit, while the method ③ requires that the constant current loop holding circuit can send out an analog off-hook signal, and requires the test signal attenuation of the test loop to be small enough , it will inevitably make the volume of the audio coil larger and inconvenient to use

Method used

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  • Comprehensive test device for analog interface in telephone exchange
  • Comprehensive test device for analog interface in telephone exchange
  • Comprehensive test device for analog interface in telephone exchange

Examples

Experimental program
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Effect test

Embodiment Construction

[0012] exist figure 1 Among them, the audio transceiver circuit 1 is connected to the 2 / 4-wire conversion circuit 2, through the normally closed contacts of the K1 and K2 contacts of the control relay 14, the 2 / 4-wire conversion circuit 2, and the constant current loop holding circuit 4 are connected through the connecting wire 7, 8 is connected with the external connecting wire 5,6 of the analog interface comprehensive test device 10 of the telephone exchange, and the ring current transceiver circuit 15 is connected with the external connection of the analog interface comprehensive test device 10 of the telephone exchange through the normally open contacts of the K1 and K2 contacts of the control relay 14. The connection lines 5 and 6 are connected, and the control logic circuit 3 controls the whole test circuit.

[0013] exist figure 2 In , the structural diagram of the embodiment of the comprehensive test device for the analog interface of the telephone exchange of the pr...

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Abstract

The comprehensive test device includes an aduio transceiver circuit, a 2 / 4 line converting circuit, a control logic circuit, a constant-current loop maintaining circuit and a ringing receiving and transmitting circuit. The two wires of the constant-current loop maintaining circuit are connected separately to the external wires of the test device, and one of those has a serially connected zener diode, which eliminates the attenuation of AC test signal during testing power-less interface to make the test device suitable for both power-less and powered interfaces.

Description

technical field [0001] The invention relates to a comprehensive testing device for the analog interface of a telephone exchange. Background technique [0002] In the telephone exchange system, there are various interfaces connecting the telephone exchange and external telephone equipment, such as common power interface, loop interface, magnet interface, carrier interface, etc. The working conditions of these interface circuits have a direct impact on the entire system. Therefore, it is necessary to detect the working conditions of these interfaces in real time. Regardless of whether the test device for detecting the interface is independent of the interface or integrated with the interface, the same work is done, such as audio path detection, ringing detection, hook off-hook detection, etc. If the test is carried out on a common power interface with a power feed, the test device works normally in the usual way. However, for the test of the interface without feed, because t...

Claims

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Application Information

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IPC IPC(8): H04M3/22
Inventor 冯军
Owner BEIJING JIAXUN FEIHONG ELECTRIC CO LTD
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