JP2000209334A - Communication quality measurement system in telephone network - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To surely measure communication quality in a communication line on the same route of a telephone network. SOLUTION: A communication quality in a telephone network in which a pair of measuring devices 13a and 13b are connected to a telephone network in which an exchange 11 is incorporated, and a communication quality of a communication line formed between the pair of measuring devices is evaluated. In the measurement system, communication line forming means for forming a communication line between the measurement devices is provided for each measurement device. Further, in a state where the communication line formed by the communication line forming means is continued,
Transmission quality measuring means 30 for measuring the transmission quality for the communication line, and F for measuring the facsimile communication quality for the communication line.
An AX communication quality measuring means 31 and a data communication quality measuring means 32 for measuring data communication quality for a telephone line are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telephone network in which an exchange is incorporated, between general telephone terminals connected to the telephone network, between facsimile terminals, and between information processing terminals such as personal computers. The present invention relates to a communication quality measurement system in a telephone network for evaluating communication quality for a communication line formed in a telephone network.

[0002]

2. Description of the Related Art When a new telephone network such as a public telephone network in which a number of exchanges are incorporated or a private telephone network in which one exchange is incorporated is newly constructed, or a new exchange is incorporated in a telephone network, Various tests are carried out to confirm that the telephone network operates normally and to maintain the system after the operation.

FIG. 6 shows one of the telephone network evaluation methods.
As shown in (a), in a state where a communication line is formed between a pair of telephone terminals 2a and 2b connected to the telephone network 1, various transmission quality measurement signals are transmitted and received between the telephone terminals 2a and 2b. Then, a method of evaluating the communication quality (transmission quality) of the corresponding communication line formed between the telephone terminals 2a and 2b has been put to practical use. In order to quantitatively measure the communication quality (transmission quality), instead of a pair of telephone terminals,
As shown, a test signal generator 3a and a signal reception analyzer 3b are connected to the telephone network 1.

However, a facsimile (hereinafter abbreviated as FAX) terminal is connected to the telephone network in addition to the above-mentioned general subscriber telephone terminal. Therefore, in the test for checking the quality of the telephone network FAX, a test image is transmitted between the FAX terminals while a pair of FAX terminals are connected to the telephone network and a communication line is formed between the FAX terminals. A method of evaluating a received test image is employed.

FIG. 6B is a diagram showing a method for evaluating the facsimile communication quality in a telephone network.

[0006] Two fax terminals 4 for the telephone network 1
a and 4b are connected. The test chart 5 is transmitted from the transmitting-side FAX terminal 4a to the receiving-side FAX terminal 4b, and the test staff visually recognizes the test chart 6 received by the receiving-side FAX terminal 4b and the test chart 5 of the transmission source. I was comparing.

Further, an information processing terminal such as a personal computer is connected to the telephone network in addition to the above-mentioned general subscriber telephone terminal and FAX terminal. Then, various data information exchanges including electronic mails are performed between the information processing terminals. Therefore, the quality confirmation test for data information exchange of the telephone network is performed in a state where a pair of information processing terminals are connected to the telephone network and a communication line is formed between the information processing terminals.
A method is employed in which test data is transmitted and received between information processing terminals, and the test data received by each other is printed out by, for example, a printer, and evaluated by a tester.

FIG. 6C is a diagram showing a method of evaluating data communication quality (quality relating to data information exchange) in a telephone network.

For the telephone network 1, two information processing terminals 7
a and 7b are connected via modems 8a and 8b.
The test data is transmitted from one information processing terminal 7a to the other information processing terminal 7b via the modem 8a and the telephone network 1, and the test data received by the information processing terminal 7b on the receiving side is printed out. The tester visually compared the original test data sent by the sender.

Next, test data is transmitted from the information processing terminal 7b to the information processing terminal 7a to perform an equivalent test.

[0011]

However, FIG.
(A), (b), the transmission quality evaluation method shown in (c), F
The following problems still need to be improved in the method of measuring the communication quality for the communication line posted in the telephone network 1 using the AX communication quality evaluation method and the data communication quality evaluation method.

That is, in the facsimile communication quality evaluation method shown in FIG. 6B, the image quality of the received test chart 5 is evaluated by relying on the visual inspection of a tester.
There are individual differences among test staff, making it impossible to evaluate objectively and quantitatively.

Further, the FA terminals 4a and 4b transmit the FA
In order to carry out X communication, each of the FAX terminals 4a and 4b incorporates a FAX communication processing unit having a FAX communication protocol. This FAX communication protocol is FAX
Various functions are provided for facilitating fax communication between the terminals 4a and 4b.

More specifically, when a communication line formed in the telephone network 1 is defective, images may not be transmitted normally. In this case, the FAX communication protocol incorporated in the FAX terminal 4b on the receiving side sends a data retransmission request or the like to the FAX terminal 4a on the transmitting side. FAX of the caller
When receiving a retransmission request or the like from the receiving side, the terminal 4a retransmits the same data.

However, as far as the test staff can see the received test chart 6 output from the FAX terminal 4b on the receiving side, the reception test chart 6
There is a problem that it cannot be distinguished whether the data is received in the first transmission or the test chart 6 as a result of retrying two or more times.

Information such as whether or not retransmission has been performed once without retransmission, whether retransmission has occurred, and the number of times of retransmission are described in FA
This is a very important item in evaluating the communication quality of the telephone line of the telephone network 1 formed between the X terminals 4a and 4b.

Further, the FAX communication protocol incorporated in each of the FAX terminals 4a and 4b requires a fallback function. That is, the FAX communication protocol has a plurality of types of data transmission speeds for transmitting data to the other FAX terminal, for example, 9600 bps and 4800 bps. Then, the maximum transmission speed allowed at that time is automatically selected according to the receiving capability of the destination FAX terminal 4b or the state of the communication line, and data transmission is performed.

Therefore, if the established communication line becomes defective due to some factor, a fallback occurs in which the data transmission speed is automatically reduced. Thus, the fallback is greatly affected by the quality of the communication line formed in the telephone network 1. However, as far as the test staff can look at the received test chart 6 output from the FAX terminal 4b on the receiving side, there is no way to know at what data transmission speed this reception test chart 6 was transmitted. Absent.

As a result, there is a concern that the reception test charts 6 having different data transmission rates are compared and compared to judge the quality of the communication line formed in the telephone network 1.

As described above, the same test chart 5 is transmitted from the transmitting-side FAX terminal 4a to the receiving-side FAX terminal.
Even if the signal is transmitted to the terminal 4b, the required communication time from the reception start time to the reception end time for the corresponding test chart differs depending on the state of the communication line formed between the two.

However, for the tester, as far as the test chart 6 received from the FAX terminal 4b on the receiving side can be seen, the reception test chart 6
There is no way to know the time required for communication.

As described above, a pair of F
Just by connecting the AX terminals 4a and 4b and transmitting the test chart, the F
AX communication quality cannot be evaluated accurately.

In the data communication quality measuring method shown in FIG. 6C, a tester determines whether or not a data error exists in received test data, and furthermore, the tester determines the number of data errors. Manual counting significantly increases the burden on testers.

In order to carry out data communication between the information processing terminals 7a and 7b connected to the public telephone network 1, each of the information processing terminals 7a and 7b has a data communication process having a data communication protocol. Department is incorporated. The data communication protocol has various functions for smoothly performing data communication between the information processing terminals 7a and 7b.

That is, as in the case of the FAX communication protocol described above, if the communication line formed in the telephone network 1 is defective, data may not be transmitted normally.
In this case, the data communication protocol incorporated in the information processing terminal 7b on the receiving side sends a data retransmission request to the information processing terminal 7a on the calling side. When receiving the retransmission request from the receiving side, the information processing terminal 7a on the transmitting side retransmits the same data.

However, as far as the test staff can see the received test data printed out from the information processing terminal 7b on the receiving side, whether the received test data was received in the first transmission, There is a problem that it cannot be distinguished whether the data is test data as a result of retransmission attempts more than once.

Furthermore, there are various types of data communication protocols incorporated in each of the information processing terminals 7a and 7b according to the purpose of use and the data transmission speed. Therefore, even if the same data is transmitted, the speed and format of signals and information transmitted on a communication line formed between the two greatly differ depending on the data communication protocol used. Therefore, it is necessary to confirm that these signals and information are correctly transmitted in the communication line at the specified speed.

Further, as described above, in order to evaluate the communication quality for the communication line formed in the telephone network 1 in detail, three quality measurements of transmission quality measurement, FAX communication quality measurement, and data communication quality measurement are required. Need to be implemented. However, each quality measurement is performed by a separate measurement system. That is, in each measurement system, when starting the measurement of the communication quality for the communication line, it is necessary to first form the communication line for which the communication quality is to be evaluated between the terminals.

When the telephone network 1 becomes large-scale, even if the same dialing operation is performed from one terminal to another terminal, a communication line of the same route is not necessarily formed between the pair of terminals. . That is, once the communication line formed between a pair of terminals is interrupted, it is very difficult to reproduce the communication line on the same route. Even if the communication line on the same route is formed, the test There is no way for the person to confirm that the communication line of the same route has been formed.

Therefore, it is very difficult to perform three quality measurements of transmission quality measurement, facsimile communication quality measurement, and data communication quality measurement on the same communication line. Therefore, it has been very difficult to accurately evaluate the communication quality for the formed communication line.

The present invention has been made in view of such circumstances, and has been formed between a pair of measuring instruments connected to a telephone network by incorporating a plurality of communication quality measuring functions. Communication quality including transmission quality, facsimile communication quality, and data communication quality can be reliably measured on a communication line on the same route of a telephone network, and these qualities can be measured quantitatively. An object of the present invention is to provide a communication quality measurement system in a telephone network that can measure with high accuracy.

[0032]

SUMMARY OF THE INVENTION According to the present invention, a pair of measuring instruments are connected to a telephone network in which an exchange is installed, and the communication quality of a communication line formed between the pair of measuring instruments is evaluated. It is applied to a communication quality measurement system in a telephone network.

In order to solve the above problem, the communication quality measuring system of the present invention is provided with a communication line forming means for forming a communication line between the measuring devices for each measuring device. Further, in a state where the communication line formed by the communication line forming means is continued, a transmission quality measuring means for measuring transmission quality for the communication line and a state where the communication line formed by the communication line forming means is continued , A facsimile communication quality measuring means for measuring facsimile communication quality with respect to a telephone line, and a data communication quality measuring means for measuring data communication quality with respect to the telephone line when the telephone line formed by the telephone line forming means is continued. And

In the communication quality measuring system for a telephone network configured as described above, transmission quality measuring means, FAX communication quality measuring means and data communication quality measuring means are provided in a pair of measuring instruments connected to the telephone network. Three quality measures are incorporated.

Then, in a state where a communication line is formed between a pair of measuring devices via the telephone network, the above three quality measuring means are continuously performed. Therefore,
Since three types of quality measurements are reliably performed on the same communication line including the path, the communication quality measurement accuracy of the communication line can be improved.

In the communication quality measurement system according to another invention, a facsimile communication protocol and data communication for performing facsimile communication with a counterpart measuring instrument via a communication line are provided to each measuring instrument. A communication processing unit having a data communication protocol for performing the test, a test chart memory storing the same test chart and a test data memory storing the same test data, and a call forming a communication line between the measuring instruments. Line forming means.

Further, while the communication line formed by the communication line forming means is continued, one measuring device transmits at least a test signal for measuring transmission quality to the other measuring device, and transmits the test signal to the other measuring device. The measuring instrument measures the transmission quality such as the level of the received test signal to measure the transmission quality for the communication line, and the one measuring instrument uses its own test chart and the test chart in the memory as a fax communication protocol. FAX communication to measure the FAX communication quality for the communication line by comparing the received test chart with the test chart stored in its own test chart memory The quality measuring means and one of the measuring instruments use the data communication protocol to store the test data in its own test data memory. Data communication quality measuring means for transmitting to the other measuring device, and measuring the data communication quality for the telephone line by comparing the received test data with the test data stored in its own test data memory. And

In the communication quality measuring system in the telephone network thus configured, a measurement signal for measuring the transmission quality output from one measuring device on the transmitting side is received by the measuring device on the receiving side. Since the transmission quality such as the level is measured, the transmission quality of the communication line formed between the two can be quantitatively measured.

The same test chart memory is formed for the receiving side measuring device and the transmitting side measuring device. Therefore, when the receiving-side measuring instrument receives the test chart transmitted from the transmitting-side measuring instrument using the FAX communication protocol, the received test chart and the test chart stored in its own test chart memory are received. By comparing with the above, the data error of the received test chart can be quantitatively grasped. That is,
It is possible to quantitatively measure the facsimile communication quality of the communication line formed between them.

Further, the same test data memory is formed for both measuring instruments. Therefore, upon receiving the test data transmitted from the transmitting-side measuring device using the data communication protocol, the receiving-side measuring device compares the received test data with the test data stored in its own test data memory. By comparing
Data errors of the received test data can be quantitatively grasped. That is, it is possible to quantitatively measure the data communication quality of the communication line formed between them.

As described above, it is possible to reliably and quantitatively grasp various communication qualities on a communication line formed in the telephone network.

[0042]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a schematic configuration of a communication quality measuring system in a telephone network according to one embodiment of the present invention.

For example, one measurement planning device 12 and two measuring devices 13a and 13b are connected to a telephone network 11 in which a number of exchanges such as a public telephone network are incorporated.

For example, the measurement planning device 12 including a host computer includes a display unit 14, an operation unit 15 such as a keyboard, a storage unit 16, a measurement condition setting unit 17, and a modem 18, as shown in the figure. . Then, the measurement planning device 12 communicates via the telephone network 11 with each measuring device 13a,
13b, it instructs detailed measurement conditions including the type of the FAX communication protocol to be used and the type of the data communication protocol to be used.

The measurement planning device 12 includes a
a, 13b, the transmission quality measurement result, the FAX communication measurement result, the data communication measurement result, etc. are collected, and the communication quality of the communication line formed between the measuring devices 13a, 13b is measured. The measurement result is output to the display unit 14 for display.

The pair of measuring devices 13a and 13b have the same configuration, and, as shown in FIG.

That is, a modem 19, a communication processing group 20, and a test signal generator 21 are provided in each of the measuring devices 13a and 13b.
a, test chart memory 21b, test data memory 21c, sequence control unit 22, quality measurement unit 23, measurement condition setting unit 24, clock circuit 25, measurement result transmission unit 26,
A program memory 27 and a data memory 28 are stored.

The communication processing group 20 includes a plurality of communication processing units 20.
a to 20d. In the system of this embodiment, the communication processing group 20 includes one communication processing unit 20a having a facsimile communication protocol and three communication processing units 20b having two different data communication protocols.
0c and 20d.

Each of the communication processing units 20a to 20d communicates with each other via a modem 19 and a communication line formed in the telephone network 11 according to a unique facsimile communication protocol or a unique data communication protocol stored and held therein. It has a function of performing FAX communication or data communication with the measuring devices 13b and 13a on the side.

The measurement condition setting unit 24 sets the FAX communication protocol to be used, the data communication protocol to be used, and the detailed measurement conditions instructed from the measurement planning device 12 via the modem 19 to the sequence control unit 22. further,
The measurement condition setting unit 24 outputs one communication processing unit 20a, 20b, 20 corresponding to the designated FAX communication protocol or data communication protocol from the communication processing group 20.
Select c and 20d to maintain the operating state.

The program memory 27 stores a measurement program for four types of communication qualities for a communication line implemented by the pair of measuring devices 13a and 13b. Specifically, the path check measurement program 27a,
Transmission quality measurement program 27b, fax communication quality measurement program 27c, data communication quality measurement program 27d
Is stored.

The test signal generator 21a generates various test signals used for path check measurement and transmission quality measurement.

The test chart memory 21b contains FA
For example, a test chart (test image) in an image compressed state used in the X communication quality measurement is stored. The test data memory 21b stores test data to be used for data communication quality measurement and transmitted to the other party. In addition,
This test data is composed of, for example, a pseudo random signal pattern.

The sequence control unit 22 operates in a state where a communication line is formed with the measuring devices 13b and 13a on the other side.
The measuring programs 27a to 27d stored in the program memory 27 are read out in order, and the measuring instrument 1 on the other side is read in accordance with a test sequence corresponding to the measuring program.
The transmission and reception of various signals and data are performed between 3b and 13a.

More specifically, the test signal output from the test signal generator 21a, the test chart read from the test chart memory 21b, the test data stored in the test data memory 21c, and the like are selected and designated first. The data is passed to one of the communication processing units 20a to 20d, and transmitted to the measuring devices 13b and 13a on the other side (the receiving side). Further, the sequence control unit 22 converts the test signals, test charts, and test data transmitted from the measuring devices 13b and 13a of the other party into one of the communication processing units 20a to
20d and passed to the quality measuring unit 23.

The sequence control unit 22 transmits a test chart or test data to the counterpart measuring devices 13b and 13a when necessary,
When data is received from b and 13a, the transmission time and the reception time are read out from the clock circuit 25 and stored in the data memory 28 in time series as a time stamp.

FIG. 3 shows a measuring device 13 via a telephone network 11.
FIG. 9 is a sequence diagram showing a series of test operations on a communication line including a plurality of communication quality measurements performed by each sequence control unit 22 between a and 13b. In FIG. 3, the test is started from the measuring device 13a for convenience. That is, the measuring device 13a is on the transmitting side, and the measuring device 13b is on the receiving side.

When an off-hook operation is performed on the measuring device 13a, a DT signal is returned from the exchange of the telephone network 11. When the telephone number of the receiving-side measuring device 13b is dialed, a call signal is transmitted to the receiving-side measuring device 13b, and at the same time, the switching device of the telephone network 11 transmits the calling signal to the transmitting-side measuring device 13a.
A BT signal is returned. When the receiving-side measuring device 13b goes off-hook, a communication line is formed between the pair of measuring devices 13a and 13b.

When a communication line is formed, a path check test 33, a transmission quality measurement 34, a FAX communication quality measurement 35,
A signal for quality measurement such as the data communication quality measurement 36 and various data are transmitted and received. When the transmission and reception of a series of signals and data are completed, the measuring devices 13a and 13b perform an on-hook operation and cut off the communication line formed between them.

FIG. 4 shows that, in the facsimile communication quality measurement 35, the sequence control unit 22 executes a communication between the outgoing-side measuring device 13a and the receiving-side measuring device 13b performed via the communication control unit 20a having the facsimile communication protocol. FIG. 4 is a sequence diagram showing transmission and reception of a signal and a test chart.

The measuring device 13a on the transmitting side performs a time stamp (CNG) using the current time read from the clock circuit 25 as the measurement start time. Similarly, the receiving-side measuring instrument 13b also timestamps the measurement start time.

Next, the data transmission speed is set to the reference speed, and the data transmission speed (DCS) is transmitted to the measuring device 13b on the receiving side. Then, the training data (TCF) is transmitted to the receiving-side measuring device 13b at the notified transmission speed. When receiving an NG response from the measuring instrument 13b on the receiving side indicating that the corresponding training data has not been received normally, the data transmission speed is reduced by one step. Then, the training data is transmitted again to the receiving-side measuring instrument 13b at the changed transmission rate.

If no NG response is received within a predetermined time, it is determined that the training data has been received normally, and the first test chart is read from the test chart memory 21b, and the data is read at the previously determined transmission rate. Is transmitted to the measuring instrument 13b on the receiving side. When receiving a retransmission request indicating that the corresponding test chart has not been normally received from the receiving-side measuring instrument 13b, the same test chart is transmitted to the receiving-side measuring instrument 13b again. Next, the second test chart is read from the test chart memory 21b and transmitted to the receiving-side measuring instrument 13b at the previously determined transmission rate.

The receiving-side measuring instrument 13b reads the reception start time t _RS and the reception end time t _{RE of} each test chart from the clock circuit 25 and writes them in the data memory 28.

FIG. 5 shows a measuring device 1 on the transmitting side which is executed by the sequence control unit 22 in the data communication quality measurement 36.
FIG. 9 is a sequence diagram showing transmission and reception of a signal and test data between 3a and a receiving-side measuring instrument 13b. Note that FIG.
In, the transmission data is divided into multiple blocks,
A case is shown in which the communication processing unit 20b having the XMODEM communication protocol that incorporates a frame for each block and transmits it to the other side in block units is selected.

As shown in the figure, the test data is first divided into blocks from the transmitting measuring device 13a and transmitted to the receiving measuring device 13b. Then, the measuring device 13 on the receiving side
b: Divide the same test data from b
3a. In the process of transmitting and receiving the test data, various control signals corresponding to the respective data communication protocols are transmitted and received between them.

Further, the sequence control unit 22 determines the start time t of transmission of test data to the measuring device 13b on the receiving side.
_SS and transmission end time t _SE , reception start time t _RS and reception end time t _RE of test data from the measuring instrument 13b on the receiving side.
Is read from the clock circuit 25 and written into the data memory 28.

As shown in FIG. 2, the quality measuring unit 23 is written in a test signal, a test chart, test data, and a data memory 28 attached to the test signal, which are input via the sequence control unit 22. Based on various information including the time stamp, the measuring devices 13b, 13
The communication quality of the communication line to be measured formed between the communication line and the communication line is measured.

The measurement result transmitting unit 26 transmits each measurement result obtained by the quality measuring unit 23 to the measurement planning device 12 via the modem 19 and the telephone network 11.

In the quality measuring section 23, a path check detecting section 29, a transmission quality measuring section 30, a FAX communication quality measuring section 3
1. A data communication quality measuring unit 32 is provided.

Further, in the facsimile communication quality measuring section 31, a communication time measuring section 31a, a data error measuring section 31b,
A retransmission number measurement unit 31c and a fallback measurement unit 31d are incorporated. In the data communication quality measuring unit 32, a communication time measuring unit 32a, a data error measuring unit 32b,
A retransmission count measuring unit 32c is incorporated.

The path check detecting section 29 performs measurement based on the path check test 33 shown in FIG.
b, by transmitting a conduction signal output from the test signal generator 21a to the measuring devices 13b, 13a on the other side, to determine whether a communication line is correctly formed between the measuring devices 13b, 13b on the other side.
Confirm that a response signal is input from 13a.

Further, the transmission quality measuring section 30 performs the test signal generation section 21a based on the transmission quality measurement 34 shown in FIG.
The audio signals output from the measuring instruments 13b, 13
a, and performs various characteristic measurements on the voice communication quality when it is assumed that a normal telephone terminal is connected to the communication line formed between the measuring devices 13a and 13b. Specifically, characteristics such as transmission loss, non-speech noise, speech noise, attenuation distortion, phase jitter, impulse noise, and clipping are measured.

The communication time measuring unit 31a in the facsimile communication quality measuring unit 31 uses the receiving-side measuring device 13b in the sequence diagram of FIG. 4 to terminate reception from the reception start time t _RS of the test chart from the transmitting-side measuring device 13a. Time t
The communication required time TR to the _RE is measured.

The data error measuring section 31b of the FAX communication quality measuring section 31 transmits the measuring instruments 13b, 13a on the transmission side via its own FAX communication protocol communication processing section 20a.
By comparing the received test chart with the test chart stored in its own test chart memory 21b, errors in the received test chart are quantitatively measured.

More specifically, each time the digitized bit data for one line in the test chart is received, the bit data for one line in the test chart stored in the own test chart memory 21 is replaced with the corresponding bit data. The number of inconsistencies is checked by comparison, and the number of inconsistencies is set as the data error number E for one line. Then, the data error count E for one line is accumulated over all the lines constituting the test chart, and the total data error count SE of the entire received test chart is calculated.

The number-of-retransmissions measuring section 31c in the facsimile communication quality measuring section 31 is provided for each facsimile of the measuring instruments 13a and 13b due to a failure of a communication line in the telephone network 11 formed between the measuring instruments 13a and 13b. communication processing unit 20a of the communication protocol to measure the number N _S of the retransmission of the test chart to be performed.

The fallback measuring unit 31d of the FAX communication quality measuring unit 31 performs a test performed by the communication processing unit 20a of each FAX communication protocol due to a failure of the communication line formed between the measuring devices 13a and 13b. The fallback speed indicating a decrease in the transmission speed of the chart and the number of occurrences SF thereof are measured.

On the other hand, the communication time measuring unit 32a of the data communication quality measuring unit 32 calculates the required transmission time TS from the transmission start time t _SS to the transmission end time t _SE of the test data transmitted from the self side to the other side, and The reception time TR from the reception start time _tRS to the reception end time _tRE of the test data from the side is measured.

The data error measuring unit 31b of the data communication quality measuring unit 32 stores the test data received from the measuring devices 13b and 13a of the other party and the test data memory 2 of its own.
By comparing with the test data stored in 1c, the total number of data errors SE of the received test data is quantitatively measured.

The number of retransmissions measuring unit 32c of the data communication quality measuring unit 32 is determined by the failure of the communication line in the telephone network 11 formed between the measuring devices 13a and 13b.
a, the communication processing unit 20b and 13b to measure the number N _S of re sending test data to be carried.

Then, the above-described path check result, transmission quality measurement result, F
The AX communication quality measurement result and the data communication quality measurement result are transmitted to the measurement planning device 12 via the measurement result transmitting unit 26.

As described above, the measurement planning device 12 obtains the path check results measured by the measuring devices 13a and 13b,
It collects transmission quality measurement results, FAX communication measurement results, data communication measurement results, and the like, measures the communication quality of the communication line formed between the measuring devices 13a and 13b, and displays the measurement results on the display unit 14. Output.

In the communication quality measuring system for the telephone network configured as described above, a path check function, a transmission quality measuring function, and a FAX communication quality are provided in a pair of measuring devices 13a and 13b connected to the telephone network 11. Measurement function,
Four quality measurement function stages including a data communication quality measurement function are incorporated.

Then, in a state where a communication line is formed between the pair of measuring devices 13a and 13b via the telephone network 11, the above-described four quality measuring means are continuously performed. Therefore, four types of quality measurement are surely performed on the same communication line including the same route, so that it is possible to measure the relationship between the transmission quality, the FAX communication quality, and the data communication quality for the communication line.

The transmission quality measurement function, the FAX communication quality measurement function, and the data communication quality measurement function other than the path check function include a test signal, a test chart, and a test chart output from one of the measuring instruments 13a on the transmitting side. Since the test data is received by the measuring device 13b on the receiving side and the signal level, the total number of data errors, the required communication time, the number of retransmissions, the number of fallbacks, and the like are measured, the communication line formed between the two. Communication quality can be quantitatively measured.

Accordingly, it is possible to reliably and quantitatively grasp various communication qualities on the communication line formed in the telephone network 11.

[0089]

As described above, in the communication quality measuring system in the telephone network according to the present invention, a plurality of communication quality measuring functions are incorporated in a pair of measuring instruments connected to the telephone network.

Therefore, communication quality including transmission quality, facsimile communication quality and data communication quality on the same communication line of the telephone network formed between the measuring instruments can be reliably measured, and these qualities can be quantitatively measured. Measurement can be performed, and communication quality with respect to the formed communication line can be measured with high accuracy.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of a communication quality measurement system in a telephone network according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a detailed configuration of a measuring instrument incorporated in the measuring system of the embodiment.

FIG. 3 is a sequence diagram showing the entire operation from the formation of a communication line to the interruption of the communication line between the measuring instruments of the measurement system of the embodiment.

FIG. 4 is a facsimile between measuring instruments of the measuring system.
FA implemented between measuring instruments using communication protocol
Measurement sequence diagram of X speech quality measurement

FIG. 5 is a measurement sequence diagram of data communication quality measurement performed between the measuring devices using the data communication protocol between the measuring devices of the measurement system.

FIG. 6 is a diagram showing a conventional communication quality measurement method for a communication line formed in a telephone network.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 ... Telephone network 12 ... Measurement planning apparatus 13a, 13b ... Measuring device 16 ... Storage part 17, 24 ... Measurement condition setting part 18, 19 ... Modem 20 ... Communication processing group 20a, 20b, 20c, 20d ... Communication processing part 21a ... Test signal generator 21b ... Test chart memory 21c ... Test data memory 22 ... Sequence control unit 23 ... Quality measuring unit 25 ... Clock circuit 26 ... Measurement result sending unit 27 ... Program memory 28 ... Data memory 29 ... Path check Detector 30: Transmission quality measurement unit 31: FAX communication quality measurement unit 32: Data communication quality measurement unit

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hisao Terasawa 5-10-27 Minamiazabu, Minato-ku, Tokyo Anritsu Corporation (72) Inventor Yasuhiro Nishikawa 5-10-27 Minamiazabu, Minato-ku, Tokyo Anritsu (72) Inventor Yoshifumi Toyama 5-10-27 Minamiazabu, Minato-ku, Tokyo Anritsu Corporation (72) Inventor Kazunori Nakayama 3-19-2 Nishishinjuku, Shinjuku-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Inventor: Yu Ueno 3-19-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Inventor: Hiroshi Yamashita 3-19-2, Nishi-Shinjuku, Shinjuku-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Inventor Naoki Yokoyama 3-19-2, Nishi-Shinjuku, Shinjuku-ku, Tokyo Nippon Telegraph and Telephone Corporation F-term (reference) 5K019 AA02 BA51 BB31 BB41 CC09 CC14 CC16 CD01 DC05

Claims (2)

[Claims] 1. A pair of measuring devices (13a, 13b) are connected to a telephone network (11) in which an exchange is built, and the communication quality of a communication line formed between the pair of measuring devices is evaluated. A communication quality measuring system in a telephone network, comprising: a communication line forming means (19, 22) provided in each of said measuring devices for forming a communication line between the measuring devices; A transmission quality measuring unit (30) for measuring transmission quality for the communication line in a state where the line is continued; and a transmission quality measurement unit for measuring the transmission quality for the communication line in a state where the communication line formed by the communication line forming unit is continued. Facsimile communication quality measuring means (31) for measuring facsimile communication quality; and measuring data communication quality for the communication line while the communication line formed by the communication line forming means is continued. Communication quality measurement system in a telephone network, characterized by comprising that the data communication quality measuring means (32), the. 2. A pair of measuring devices (13a, 13b) are connected to a telephone network (11) in which an exchange is installed, and the communication quality of a communication line formed between the pair of measuring devices is evaluated. A communication quality measurement system for a telephone network, the communication quality measurement system being provided in each of the measurement devices, for performing a FAX communication protocol and data communication for performing FAX communication with a counterpart measurement device via the communication line. A communication processing unit (20a to 20d) having a data communication protocol; a test chart memory (21b) provided in each of the measuring instruments for storing the same test chart and a test data memory for storing the same test data (21c), a communication line forming means (19, 22) provided in each of the measuring devices and forming a communication line between the measuring devices, and a communication line formed by the communication line forming means is continued. Condition In one embodiment, one measuring device transmits at least a test signal for measuring transmission quality to the other measuring device,
The other measuring device measures transmission quality such as the level of a received test signal to measure transmission quality for the communication line, and a communication quality measurement unit (30); and a communication line formed by the communication line formation unit. In the continued state, one of the measuring instruments transmits its own test chart and the memory test chart to the other measuring instrument using the FAX communication protocol, and the other measuring instrument transmits the received test chart and its own test. A facsimile communication quality measuring means (31) for measuring facsimile communication quality for the communication line by comparing with a test chart stored in a chart memory, and a communication line formed by the communication line forming means being continued. In this state, one of the measuring instruments stores the test data of its own test data memory using the data communication protocol. Data communication quality measurement for measuring the data communication quality for the telephone line by comparing the received test data with the test data stored in its own test data memory. Means for measuring communication quality in a telephone network, comprising: