KR100414368B1 - Test System for ISDN(Integrated Services Digital Network) NT(Network Terminal) Card - Google Patents

Abstract

An object of the present invention, in checking the performance of the interface card mounted on the subscriber side of the integrated information communication network, by performing a simple and accurate performance test by preventing a performance determination error due to power on / off of the interface card The present invention is to provide a comprehensive information communication network subscriber interface performance test system.

The configuration of the present invention includes a subscriber echo canceller 51 and a subscriber interface 50 which performs an interface function of data transmission and reception with an exchange of the integrated information communication network at the subscriber side of the integrated information communication network, and at the exchange side. In the inspection system for the performance of the integrated information and communication network subscriber interface consisting of a test device 70 for exchanging and receiving a signal with the echo canceller 51 of the subscriber interface, the subscriber interface 50 is the subscriber echo canceller And a clock generator 55 for generating a clock of a predetermined frequency according to whether the 51 is operated, and the test apparatus 70 generates a clock of a predetermined size from a signal transmitted from the subscriber interface 50. It is characterized in that it comprises a clock detector 75 for detecting.

Description

Integrated Telecommunication Network Subscriber Interface Performance Test System {Test System for ISDN (Integrated Services Digital Network) NT (Network Terminal) Card}

The present invention relates to an Integrated Services Digital Network (ISDN) subscriber interface performance test system, and more specifically, to the performance of an interface card mounted on the subscriber side of the integrated information network. The present invention relates to a comprehensive information communication network subscriber interface performance test system capable of preventing a performance determination error due to power on / off of the interface card and performing an accurate performance test.

While the conventional public switched telephone network is a transmission switching network focused on analog voice data transmission, the integrated information communication network is a transmission switching network capable of simultaneously performing digital data transmission as well as voice data, and exhibits excellent performance in terms of transmission speed and data quality. .

However, such a comprehensive information communication network is equipped with a subscriber interface card (also referred to as a network terminal (NT)) on a subscriber side, and a telephone or a computer for data communication is mounted through the card. There is a case where the performance is degraded and the telephone and data communication services are not received. In this case, the exchange checks the performance of the subscriber interface card and informs the subscriber of the status.

Hereinafter, with reference to the accompanying drawings, a description will be given of a conventional Telecommunications network subscriber interface performance test system.

As shown in Figure 1, the configuration of the conventional Telecommunications network subscriber interface performance test system is as follows.

A subscriber interface 10 which performs an interface function of data transmission and reception with an exchange of the integrated information communication network at the subscriber side of the integrated information communication network;

A subscriber station 20 connected to the subscriber interface 10 to perform telephone voice and data communication;

Comprehensive information communication network switch side by the signal to and from the subscriber interface 10, it consists of a test device 30 for checking the performance of the subscriber interface (10).

The subscriber interface 10 includes a subscriber echo canceller 11.

The inspection device 30 includes an exchanger echo canceller 31.

The operation of the prior art made as described above is as follows.

In general, when a subscriber of a general information communication network reports a problem due to a problem in data transmission or a telephone call, the exchange side of the service area checks the state of the corresponding subscriber interface 10 by using the inspection apparatus 30.

The inspection apparatus 30 communicates with the echo canceller 11 of the subscriber interface 10 through the exchange echo canceller 31 and checks its performance. First, the inspection apparatus 30 activates a driving request signal AR (Activation). A request is sent, and when a driving indication signal (AI; Activation Indication) transmitted from the subscriber interface 10 is received, a full performance test is performed.

That is, the inspection apparatus 30 performs a data channel inspection, a CMR, a CMS, a B1, a B2, a loopback inspection, and the like. The driving state of the subscriber interface 10 is checked.

When the performance test is performed accordingly, the service representative of the exchange determines whether the corresponding subscriber interface function is normal or abnormal according to the test result and takes a corresponding action.

However, in the prior art operating as described above, when the functional state of the corresponding subscriber interface is checked, the inspection can be performed only when the driving is performed. Therefore, the inspection is not performed when the subscriber interface is turned on. Therefore, even though the corresponding subscriber interface does not actually fail, there is a problem that an error that is determined to be poor in performance occurs.

Accordingly, an object of the present invention is to solve the problems of the prior art as described above, and to check the performance of the interface card mounted on the subscriber side of the integrated information communication network, according to the power on / off of the interface card. It is to provide a comprehensive information communication network subscriber interface performance test system that can perform a simple and accurate performance test by preventing the performance judgment error.

1 is a block diagram applying a conventional Telecommunications network subscriber interface performance test system;

2 is a block diagram to which a comprehensive information network subscriber interface performance test system according to an embodiment of the present invention is applied.

Explanation of symbols on the main parts of the drawings

50: subscriber interface 60: subscriber terminal

70: inspection device

The configuration of the present invention for achieving the above object is made as follows.

A subscriber station of a general information communication network comprising a subscriber interface that performs an interface function of data transmission and reception with an exchange of the general information communication network, and an inspection device that exchanges signals with the subscriber interface and checks its performance. In the system for checking the performance of the interface,

The subscriber interface includes a subscriber echo canceller for transmitting and receiving a signal to and from the test device; And clock generation means for generating a clock of a constant frequency according to whether the subscriber echo canceller is operated.

The inspection apparatus may include: an exchange echo canceller configured to exchange signals with the subscriber echo canceller; And clock detecting means for detecting a clock having a predetermined magnitude in a signal transmitted from the subscriber interface.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

As shown in Figure 2, the configuration of a comprehensive information network subscriber interface performance test system according to an embodiment of the present invention is as follows.

Subscriber interface (50) performing the interface function of data transmission and reception with the exchange of the integrated information communication network at the subscriber side of the integrated information communication network, the inspection device 70 for exchanging signals with the subscriber interface at the exchange side and checks the performance, And an inspection system for inspecting the performance of the subscriber station 60 connected to the subscriber interface 50 and performing the telephone voice and data communication.

The subscriber interface 50 includes a subscriber echo canceller 51 for transmitting and receiving a signal to and from the test apparatus; And a clock generator 55 generating a clock of a predetermined frequency according to whether the subscriber echo canceller is operated.

The inspection apparatus 70, the switch echo canceller 71 for transmitting and receiving a signal with the subscriber echo canceller 51; And a clock detector 75 for detecting a clock of a predetermined size in a signal transmitted from the subscriber interface 50.

The configuration of the clock generator 55,

A decoder 56 for outputting a control signal corresponding to the operation of the subscriber echo canceller 51;

A clock generator 57 for generating and outputting a clock signal having a constant frequency;

And a relay 58 that opens and closes according to a control signal output from the decoder 56 and controls transmission of a clock signal output from the clock generator 57.

Operation of the embodiment of the present invention made as described above is as follows.

When a subscriber of the integrated information communication network reports a problem due to a problem in data transmission or a telephone call, the exchange side of the service area checks the state of the corresponding subscriber interface 50 using the inspection apparatus 70.

That is, the inspection device 70 communicates with the subscriber echo canceller 51 of the subscriber interface 50 through the switch echo canceller 71 and checks the performance. First, the inspection device 70 drives the drive request signal. AAR is sent, and when the driving indication signal AI transmitted from the subscriber interface 50 is received, the performance test operation is started in earnest.

That is, the inspection apparatus 30 performs a data channel inspection, a CMR, a CMS, a B1, a B2, a loopback inspection, and the like. The performance of the subscriber interface 10 is checked.

On the other hand, the clock generation unit 55 generates a clock of a constant frequency according to whether the subscriber interface 50 is operating the subscriber echo canceller 51.

That is, the decoder 56 of the clock generator 55 outputs a control signal corresponding to the operation of the subscriber echo canceller 51, and the clock generator 57 generates and outputs a clock signal having a constant frequency. In addition, the relay 58 is opened and closed according to the control signal output from the decoder 56 to control the transmission of the clock signal output from the clock generator 57.

Accordingly, when the power is on, the subscriber echo canceller 51 operates, and accordingly, a control signal output from the decoder 56 turns on the relay 58, thereby generating a clock generated by the clock generator 57. The signal is transmitted to the inspection device 70 on the exchange side.

The clock detector 75 of the inspection apparatus 70 checks whether the clock signal generated by the clock generator 57 is detected from the signal transmitted from the subscriber interface 50, and if the clock signal is detected, the subscriber. It is determined that the interface power is on.

Therefore, when the inspection apparatus 70 performs the performance inspection by communication with the subscriber echo canceller, and the inspection results indicate that the performance is abnormal, if there is a clock signal detected by the clock detector 75, the power supply Since this is an authorized situation, the service representative of the exchange determines that the corresponding subscriber interface is not functioning as a result of the inspection, and takes action accordingly.

However, when the test device 70 performs a performance test by communication with the subscriber echo canceller, the test result shows that the performance is abnormal, but there is no clock signal detected by the clock detector 75. Since power is not applied to the subscriber interface, the service representative of the exchange does not determine that the subscriber interface is not functioning, and requests the subscriber to apply power to perform the inspection again.

By doing the above, it is possible to prevent an error in which the performance of the subscriber interface is wrongly judged according to the inspection performed in the state where the power is not applied to the subscriber interface.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and various substitutions, conversions, and modifications are possible within the scope without departing from the technical spirit of the present invention. It will be apparent to those who have knowledge.

Therefore, the present invention operating as described above, in checking the performance of the interface card mounted on the subscriber side of the integrated information communication network, by preventing the performance determination error due to the power on / off of the interface card, it is simple and accurate There is an effect that can perform a performance test.

In addition, the present invention operating as described above has the effect of improving the quality of the service, and the reliability to the subscriber by reducing the time required for the performance check.

Claims (2)

A subscriber station of a general information communication network comprising a subscriber interface that performs an interface function of data transmission and reception with an exchange of the general information communication network, and an inspection device that exchanges signals with the subscriber interface and checks its performance. In a system that checks the performance of an interface: The subscriber interface includes a subscriber echo canceller for transmitting and receiving a signal to and from the test device; And clock generation means for generating a clock of a constant frequency according to whether the subscriber echo canceller is operated. The inspection apparatus may include: an exchange echo canceller configured to exchange signals with the subscriber echo canceller; And clock detecting means for detecting a clock of a predetermined size in the signal transmitted from the subscriber interface. The method of claim 1, The clock generating means is: A decoder for outputting a corresponding control signal according to the operation of the subscriber echo canceller; A clock generator for generating and outputting a clock signal having a constant frequency; And And a relay which opens and closes according to a control signal output from the decoder to control transmission of a clock signal output from the clock generator.