KR100610843B1 - Apparatus and method for testing trunk circuit network - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a relay line test apparatus and a method thereof and a computer-readable recording medium having recorded thereon a program for realizing the method.

2. The technical problem to be solved by the invention

The present invention relates to an apparatus for performing relay line quality test during an exchange period using a subscriber line connected to a switch and an exchanger input / output port (I / O port) and a method thereof and a program for realizing the method. To provide a computer-readable recording medium that records the data.

3. Summary of Solution to Invention

The present invention includes a first step of receiving a test target relay line and a test execution method, matching with an input / output port of an exchange, and inquiring information on the test target relay line; A second step of creating a list of test target relay lines and selecting a testable line by referring to the information on the test target relay line; And a third step of connecting the subscriber telephone line via the test relay line and recognizing the connection through the telephone line to check whether the test relay line is good or bad through a telephone tone.

4. Important uses of the invention

The present invention is used for the exchange line relay test.

Switchboard, trunk line, line test, I / O port

Description

Relay line test apparatus and method thereof for exchange period {APPARATUS AND METHOD FOR TESTING TRUNK CIRCUIT NETWORK}             

1 is an exemplary configuration diagram of a general mobile telephone system.

2 is a view illustrating an example of occurrence of a line fault in a relay section of a conventional R2 system.

Figure 3 is an exemplary view of the occurrence of a line fault in the relay section of the conventional ISUP method.

Figure 4 is a configuration diagram of one embodiment of the exchange line trunk line test apparatus according to the present invention.

Figure 5 is an embodiment flow diagram for the switching period trunk line test method according to the present invention.

Figure 6 is a detailed configuration diagram of one embodiment of the controller of the switching period trunk line test apparatus according to the present invention.

Figure 7 is an embodiment explanatory diagram for the call path connection in the switching period trunk line test apparatus according to the present invention.

8 is a detailed flowchart illustrating an example of a line test process using a voice band signal according to the present invention;

* Explanation of symbols for the main parts of the drawings

41 switchboard repeater test device 42: switchboard

43: other exchange 411: controller

412: voice modem

The present invention relates to an apparatus for testing a trunk line during an exchange, and a method and a computer readable recording medium recording a program for realizing the method. In particular, a call failure due to a defective line is detected by searching for a defect in a relay line during a short period of time. An exchange-period trunk line test apparatus for performing the prevention and a method thereof and a computer-readable recording medium having recorded thereon a program for realizing the method.

In describing a trunk line test apparatus and method thereof for identifying a fault of a trunk line during an exchange, a mobile telephone system, which is one of communication systems, will be described as an example.

1 is an exemplary configuration diagram of a general mobile telephone system.

A general mobile telephone system is composed of a terminal 11, a base station 12, a mobile telephone exchange 13, a relay switch 14, a local telephone switch 15 and a general telephone 16. The user attempts to connect to the other party through the terminal 11 or the general telephone 16.

The terminal 11 and the base station 12 are wirelessly connected, and from the base station 12 to the general telephone 16 via the exchange 13, 14, 15 are wired.

With the increasing number of mobile subscribers and operators' competitive investment in facilities, the concept of coverage is no longer a criterion that determines the superiority of operators. Instead, customers reconsider operators' superiority as the standard of call quality, so call quality is of paramount value. The call quality measurement by operator of the Ministry of Information and Communication, which was first conducted in 1999, reflects these demands of mobile phone users, and clearly recognizes that improving the call quality is a way to maintain the market advantage.

If the call quality is divided into sections, it can be divided into a wireless section and a wired section. Although the call quality environment is relatively poor compared to the wired section, the call quality improvement activities are concentrated in the wireless section, but the wired section, which occupies most of the mobile phone call paths, cannot be neglected.

The types of trunk line quality defects occurring in the wired section are as follows.

-Silent or one-way calls

-Oh connection

Noise generation

In case of noise, some calls can be made, but in case of mute, one-way call and wrong connection, the call is not possible. This type of circuit failure occurred after the switching of the relay section to the form of the ISDN User Part (ISUP), which accounts for most of the circuit defects, and cannot be detected at the exchange without accurate circuit testing. There are many problems that can be neglected.

In order to prevent the deterioration of the call quality due to such a poor circuit, the line test method that can be used currently is

-ISUP CCT (Continuous Check Tone) Test

-Circuit test function of the exchange itself

-Call quality measurement through MOS (Mean Opinion Score) measurement

-Test using a circuit tester

Etc., but due to some problems to be mentioned below, the use is insufficient.

First, a description of Continuous Check Tone (CCT) is as follows.

CCT is a circuit test method supported by ISUP. It is a method of determining whether a circuit is abnormal by comparing a return signal after transmitting a constant signal after a circuit loop from a large station.

The CCT test can be used for circuit verification during call setup, but the call setup time is increased by the test time, and it is not used much because there is a problem that cannot be detected when the actual transmission line is looped. .

The test using the test unit of the exchange itself is as follows.

Most exchanges have their own test units for circuit testing (TDX: TTTU, 5ESS: TTF, etc.) and support circuit testing.

The switch-supported circuit test method can be broadly classified into a digital characteristic test and an analog characteristic test.

The digital characteristic test is a method of measuring a bit error rate (BER) by sending a specific bit pattern to a power station and comparing the pattern with a loop returned.

For analog characteristic test method, Code105 test suggested by "AT & T" is mainly used, which is called Near End Responder (NER) and FER of FER. : Measures power loss and noise by transmitting and receiving a specific frequency between far end responders. Although it is closer to the actual call environment than BER measurement of transmission line, there is a problem that some "TDX" series exchanges do not support the function.

Next, a description will be given of the line quality test by measuring the MOS (Mean Opinion Score).

MOS measurement is a method used to measure the perceived call quality of mobile phone networks. It measures the call quality in the same way as the actual call environment. This method is suitable as a method for measuring the quality of the perceived call quality felt by the customer, but there is a problem in that it is not suitable as the wire test method for the wired section because it requires a lot of manpower and measures wired and wireless sections at the same time.

The test using the circuit test equipment is as follows.

This method continuously monitors the occurrence of circuit failure by continuously generating a call and continuously generating a call passing through a specific section of the switching network by using measuring equipment that can measure the quality of the connected call. However, there is a problem that the operator needs to test again for the defective section because the defective rate of a particular section is measured statistically.

That is, as described above, the test method of the trunk line channel conventionally used includes a method using a circuit test equipment installed in the exchange itself and a method using a CCT defined in the ISUP. These test methods are automatic tests for specific relay lines. There was a problem in that it could not detect the type of circuit defects such as transmission loops, which could not be properly detected.

This will be described in more detail as follows.

After the ISUP of the relay section, the call connection failure, which did not occur in the existing R2 method, continued to occur. Such a call connection failure occurs due to a difference between an ISUP using common channel signaling (CCS) and an R2 method using channel associated signaling (CAS).

2 is a view illustrating an example of occurrence of a circuit failure in a relay section of a conventional R2 system.

The case where a line defect occurs between the originating exchange 21 and the terminating exchange 22 is described with reference to FIG. In the R2 scheme, since signaling is performed through a voice call path, if a circuit defect exists, signaling fails and the exchange detects a circuit defect.

3 is a view illustrating an example of a line fault occurrence in a relay section of a conventional ISUP method.

In ISUP, signaling is performed through a separate signal path. In this case, even if the voice call path is bad, since the signaling is normally performed, the voice call path is connected through the bad line.

In summary, the existing test methods have the following problems.

-It is impossible to identify the exact bad section

-Excessive manpower / cost

The present invention has been made to solve the problems described above, and performs a relay line quality test during an exchange period using a subscriber line connected to a switch and an exchange input / output port (I / O port). It is an object of the present invention to provide a computer-readable recording medium recording a device and a method thereof and a program for realizing the method.

An apparatus of the present invention for achieving the above object, the exchange line repeater test apparatus, the first connection means for achieving an interface with the relay line to be tested through the exchange; Second connecting means for matching with the input / output port of the exchange to perform a call through an Australian command; And control means for controlling the first connecting means and the second connecting means and checking a state of the relay line according to a given condition to perform a test.

In addition, the method of the present invention, in the switching period trunk line test method applied to the switching period trunk line test apparatus, receiving the test target relay line and the test execution method to match the input and output ports of the exchange to query the information on the test target trunk line First step; A second step of creating a list of test target relay lines and selecting a testable line by referring to the information on the test target relay line; And a third step of connecting the subscriber telephone line via the test relay line and recognizing the connection through the telephone line to determine whether the test relay line is good or bad.

In addition, the present invention is a switchgear tester having a large capacity processor,

A first function of receiving a test target relay line and a test execution method and matching information with an input / output port of an exchange to query information about the test target relay line; A second function of creating a test target relay line list and selecting a testable line by referring to the information on the test target relay line; And a program for connecting a subscriber's telephone line via the test relay line and recognizing the connection through the telephone line to realize a third function of checking whether the test relay line is good or bad through a telephone tone. Provide a record carrier.

The present inventors, the trunk line test apparatus of the exchange period is an equipment developed to overcome the shortcomings of the existing circuit test method as described above and implement a circuit test method suitable for the actual operating environment, and utilizes an exchange operation know-how. Provide a circuit test method.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 4 is a configuration diagram of one embodiment of the exchange line trunk line test apparatus according to the present invention.

Each component of FIG. 4 for explaining the present invention includes a switchboard test apparatus 41 including a controller 411 and a voice modem 412, a corresponding switch 42 for a trunk line test, and a corresponding switch 42 And the other exchanger 43 connected to the relay line, the relay test apparatus 41 of the present invention is used for a test line between the exchanger 42 and the other exchanger 53.

The main purpose of the trunk line test apparatus 41 is to detect the defective line early and minimize the influence on the call quality through the relay line quality test in the adjacent exchange period.

The following components are required to test the circuit during the switching period.

-Interface between relay line and line test equipment

-Circuit test equipment in charge of actual test

In the relay line test apparatus 41 of the present invention, a subscriber line provided in a mobile telephone switchboard of the "TDX" series is used as an interface between the relay line and the line test equipment. The subscriber line of the exchange is housed in a sub system that accommodates analog subscribers, and through the exchange's time-switch and space-switch the relay line and the channel Ch) interface is achieved.

The call connection is implemented by using a man machine command (MMC) by matching the I / O port of the exchange. The Australian MMC allows call setup through the specific repeater Ch that the operator wishes to test, supporting efficient and accurate line testing.

The voice modem 412 was used as test equipment for performing the actual line test after the call connection. The reason I used a voice modem

-Low price

-Supports transmission and reception of voice band signal

Because. In addition, it is possible to implement the function of transmitting and receiving voice band signal such as DTMF (Dual Tone Multi Frequency) Tone, which makes it easy to implement line test equipment.

Figure 5 is a flow diagram of one embodiment for the switching period trunk line test method according to the present invention.

The circuit test method of the switching period performed in the switching period trunk line test apparatus according to the present invention is made according to the procedure shown in FIG.

First, in the trunk line test apparatus of the switching period, the switch 42 matches with the input / output port of the switching target under test, performs a connection by a call, and uses a subscriber line through a voice modem 412 to perform an actual line test. Connect to

In order to perform the test on the relay line, a line test object and conditions are input (501).

The circuit test object is selected in the root unit or in the repeater line (E1) unit. A route is a unit that manages several lines connected to a specific power at the exchange as a group.

The conditions of the circuit test are as follows.

-Number of test channels per relay line (E1)

-Characteristics of voice band signal used for circuit test

-Test passing conditions

Repetition frequency and passing conditions

-Break time considering exchange load

Next, route information is inquired (502). Since circuit management is mainly carried out on a route basis, circuit information that belongs to the route to be tested is required for circuit testing. Since the circuit data is variable, the data inquiry MMC is inputted to the direct exchange to refer to the circuit information for reference of the latest data.

Then, the line state is checked (503).

After the route information inquiry, the number of circuit tests for the specified number of channels per line E1 is carried out. An error occurs when attempting a test on a busy channel during a circuit test, so first select the Ch that can be tested by inquiring the line state. Line status inquiry uses the MMC of the exchange.

Introduce the Australian via Ch in a testable state (504).

When the test subject Ch is selected, the call path is connected by using the MMC of the exchange. At this time, when attempting to inject the call using the MMC, another call may occupy the corresponding channel first, so call occupancy failure occurs. Therefore, it is checked whether there is a call occupancy failure (505). As a result of the check, if another call occupies the corresponding channel first, if the call occupancy fails, it is recognized and repeated from the line state checking process 503.

As a result of the verification, if the call occupancy is performed, a line test for the relay line is performed (506), and the result is examined (507). That is, when a call path is connected by an Australian MMC, voice band signal transmission / reception test is performed by a voice modem connected to a subscriber line and the result is examined.

As a result of the test, the test failed line is retested a predetermined number of times (508), and then repeated from the line state checking process (503) for checking the testable line.

As a result of the test, if the line test is correctly performed, a report is output (509) on the test result, and the process ends.

Figure 6 is a detailed configuration diagram of one embodiment of the controller of the switching period trunk line test apparatus according to the present invention.

The controller of the trunk line test apparatus is composed of three blocks.

Main control unit 601

Line interface 602

I / O interface (603)

The Main Controller (603) supports operator matching and controls the overall line test process by controlling the I / O Interface (603) and the Line Interface (602). The operator matching function supports test subject and condition input, line test status display and test result output.

The I / O interface (603) directly controls the I / O port of the exchange through the serial port, and inputs the MMC to the exchange when there is an MMC input request from another block. It is responsible for returning output data. Additional functions for exchange matching include automatic login and I / O port status checking.

The line interface (602) is responsible for matching with the subscriber line and final line test through a modem. It has call recognition, auto answer, DTMF tone generation and detection for line test.

Each component of the controller can be implemented in software.

Figure 7 is an embodiment explanatory diagram for the call path connection in the switching period trunk line test apparatus according to the present invention.

Switching circuit testing requires a connection between the Ch and the subscriber line under test. However, because these features are not supported directly at the exchange, they utilize the exchange feature of the exchange and routing through the prefix to connect the channel.

Using the exchange function of the exchange, you can connect the subscriber line with the outgoing specific Ch and send out a specific digit. During the switchboard, the trunk line tester uses this function to connect line 1 of the two lines with the outgoing Ch, and to send out the telephone number of the line 2 through the outgoing Ch. The outgoing relay Ch sent to the telephone number of the line 2 is connected to the line 2 again after translating the prefix of the switching center, and there is a call path connecting the line 1 to the target Ch to line 2.

7 is a method of connecting the country-specific currency path. In the case of mobile internal network or other mobile communication network, it sends out phone number of line 2 and returns to its own country.In case of wired communication network, it uses a regular telephone as line 2 to go through the local exchange of wire communication network. Connected.

8 is a detailed flowchart illustrating an embodiment of a line test process using a voice band signal according to the present invention.

The test of the line through the channel under test begins. Line testing is implemented by sending and receiving voiceband signals through voice modems.

The Dual Tone MultiFrequency (DTMF) signal, which is an example of a voice band signal used for signal transmission over a telephone, is a signal for transmitting a digit from a telephone to an exchange through a subscriber line in an analog section, having two single frequencies. The signal is synthesized to display one digit information.

For example, digit "1" is represented by sending a signal of 697 Hz and a signal of 1209 Hz simultaneously. The DTMF frequency domain representing the digit information is shown in the table below.

Frequency (Hz) 1209 1336 1477 697 One 2 3 770 4 5 6 852 7 8 9 941 * 0 #

The line test after the call path is performed in the order shown in FIG. 8.

When the telephone line is connected to Australia by the MMC, the modem detects a ringing tone and automatically responds (801).

After the response, line 1 waits for the reception of the start signal from line 2. In line 2, a start signal is sent after a predetermined time after the response (802). At this time, the start signal may be the same as '*' present in the keypad of a general telephone.

Then, the test tone is transmitted and received to perform a test (803). That is, when the line 1 receives the start signal, it transmits the test signal a specified number of times and waits for the response signal of the line 2. In circuit 2, when the test signal is received after the test start signal is sent, the corresponding response signal is transmitted.

The response signal uses a signal different from the test signal such as 'test signal + 2' to increase reliability. The reason for using a different value from the test signal is to enable accurate test even in the case where the transmission line is looped.

Line 1 transmits the end signal and hangs up when the specified number of tests are completed. Line 2 hangs up the phone after receiving the end signal and waits for the next call. (804).

In the above embodiment, a mobile telephone network has been described as an example, but this can be applied to a communication network without distinction of wired and wireless, and can be utilized to maintain stable call quality.

In the above embodiment, the voice modem was used in the configuration of the trunk line test apparatus during the switching period. In addition, other connection means such as a dial logic board may be used to facilitate the connection between the controller and the subscriber line.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the art without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

The present invention as described above has the effect of enabling regular line tests by automating the entire process of the line test, which previously relies on the manual operation of the operator, through the relay line test apparatus.

In addition, the present invention, the test time was reduced to 15-30 seconds per channel during the manual test of the existing operator to 15-30 seconds per channel, there is an effect that can significantly reduce the manpower required by automating the entire line test process .

In addition, the present invention not only imposes an excessive load on the exchange, but also has the effect of performing the relay line test in a manner close to the actual call environment.                     

Claims (7)

In the exchange line trunk test apparatus, First connecting means for making an interface with a relay line to be tested through an exchanger; Second connecting means for matching with the input / output port of the exchange to perform a call through an Australian command; And Control means for controlling the first connecting means and the second connecting means and checking the state of the relay line according to a given condition to perform a test Exchange period relay line test apparatus comprising a. The method of claim 1, The first connecting means, And a modem which is connected to a subscriber line installed in the switch and forms an interface with a relay line to be tested. The method according to claim 1 or 2, The control means, Input / output interface processing means for controlling the input / output port of the exchange via the second connection means to input the input to the exchange and return the output data when there is an input request of a given command; Line interface processing means for matching with a line of the exchange via the first connecting means and for performing a line test; And Main control means supporting operator matching and controlling the input / output interface processing means and the circuit interface processing means to adjust the overall circuit test. Exchange period relay line test apparatus comprising a. The method of claim 3, wherein The line interface processing means, A repeater trunk line test apparatus, characterized in that for performing a line test with a call recognition, an automatic answer, generation and detection of a voice band signal, and the like. In the exchange period repeater test method applied to the exchange period repeater test apparatus, A first step of receiving a test target relay line and a test execution method and matching information with the input / output port of the exchange to query information on the test target relay line; A second step of creating a list of test target relay lines and selecting a testable line by referring to the information on the test target relay line; And The third step is to connect the subscriber's telephone line through the test relay line and recognize the connection through the telephone line to check whether the test relay line is good or bad. Exchange period relay line test method comprising a. The method of claim 5, The third step, A fourth step of connecting two subscriber telephone lines via a test target relay line using a command of an exchange through an input / output port; A fifth step in which a telephone is connected to a subscriber telephone line through a call path connection using an exchange command, and the connection is detected by the trunk line test apparatus; A sixth step of checking whether the test target relay line is good or bad by using the voice band signal after answering the call; A seventh step of repeating the step of selecting the testable line of the second step with respect to the next test target relay line if the line test result is satisfactory in the sixth step; And If the result of the check in step 6, the circuit test result is poor, the eighth step of re-testing the corresponding test target relay line to determine whether or not Exchange period relay line test method comprising a. In the switchboard trunk line test apparatus equipped with a large capacity processor, A first function of receiving a test target relay line and a test execution method and matching information with an input / output port of an exchange to query information about the test target relay line; A second function of creating a test target relay line list and selecting a testable line by referring to the information on the test target relay line; And A third function of connecting the subscriber's telephone line via the test relay line and recognizing the connection through the telephone line to check whether the test relay line is good or bad through a telephone tone. A computer-readable recording medium having recorded thereon a program for realizing this.

Images