JPH03289747A - Line quality measuring machine - Google Patents

Abstract

PURPOSE:To easily retrieve a defective line by providing a control circuit which controls a network control circuit, a data generation circuit, and a data detection circuit and decides output data from the data detection circuit, and a memory circuit which stores an opposite side telephone number, a measuring item, and a measuring condition. CONSTITUTION:The network control circuit 5 performs control for connection to an opposite machine, and the data generation circuit 1 modulates and outputs the transmission data of a test signal and a control signal. A branch circuit 6 branches modulated transmission data from modulated reception data from the opposite machine, and the data detection circuit 2 demodulates and detects the reception data. The control circuit 4 decides the output data of the data detection circuit 2 by controlling the network control circuit 5, the data generation circuit 1, and the data detection circuit 2, and the memory circuit 3 stores the opposite side telephone number, the measuring item, and the measuring condition. Therefore, it is not required to arrange with an opposite machine side by telephone before measurement, and to exchange a measuring instrument at every measuring item. Furthermore, the characteristic of a telephone line to an arbitrary opposite machine is measured at arbitrary time. Thereby, it is possible to easily retrieve the defective line.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a line quality measuring device for measuring the quality of a general subscriber's telephone line. This is used to identify faulty lines, especially when there are many different connection routes to the other party's device.

[Conventional technology]

In recent years, as work has become more computerized and the use of faxes and computer communications has increased, various problems that were not a problem when using the telephone have become a problem. There are problems such as not being able to communicate with the computer or not being able to communicate with the computer every few times. This means that instantaneous line interruptions and impulse noise, which do not pose much of a problem when using a telephone, become fatal obstacles to data communications such as FAX and personal computer communications. As a result, black and white fax signals and PC text data cannot be transmitted correctly.

Therefore, for FAX, there is a device W that has a line error rate measurement function (Japanese Patent Application Laid-Open No. 60-81962), and a device that has a function to adjust the communication speed according to the S/N ratio of the telephone line (Japanese Patent Laid-Open No. 61-218269). Although the mission of telecommunications is to transmit data reliably, faster, and more accurately, it does not solve the fundamental problem of telephone lines.

Therefore, when performing data communication using a conventional telephone network, it is necessary to measure the transmission characteristics of the telephone line in advance and confirm whether the telephone line can withstand data communication before installing the terminal equipment. . In addition, if failures occur frequently in telephone lines in operation, it is necessary to identify the location of the failure and repair it immediately.

The measurement items necessary for this purpose are shown below.

■Signal level, ■White noise, ■S/N ratio, ■Attenuation distortion,
Group delay distortion, ■Total distortion, ■Phase jitter, ■Momentary interruption, ■Impulse noise, ■Speaker echo, receiver echo, [phase]
error rate, ■ connection characteristics.

Therefore, conventionally, the transmission characteristics of a telephone line have been measured using an equipment configuration as shown in FIG.

That is, a general telephone and a measuring device are connected to the terminal side of the line to be measured and the telephone line in the exchange room, respectively, via a switching device. Additionally, an adapter that cuts the direct current of the telephone line is required between the switching device and the measuring device.6 Usually, the adapter consists of a coil and a capacitor, and its constants are set to match the characteristics of the telephone line. There is a need to.

When making measurements, call the telephone in the exchange room from the telephone on the terminal side, and after a discussion between maintenance personnel, each switch is turned to the measuring instrument side, and measurement signals are sent alternately from the exchange room side and the terminal side. and measure the transmission characteristics of the line under test. Furthermore, the measurement results are written on a prescribed form.

[Problem to be solved by the invention]

However, conventional methods require maintenance personnel at the terminal side and in the switching room, and separate measuring instruments are required for each measurement item. Therefore, maintenance personnel must be familiar with various measuring instruments.

Furthermore, there may be a problem with a certain relay line, such as a problem occurring once every few times when calling a specific terminal, or a problem occurring frequently depending on the time of day. In order to identify this fault, it is necessary to make a series of calls from one terminal to the other until the faulty line is discovered. Additionally, if there are a large number of trunk lines, it is necessary to block the outgoing trunks and narrow down the number of relay lines in the middle of the night, when traffic volume is low, in order to identify the faulty line.

The present invention has been made in view of these circumstances, and it is an object of the present invention to provide a line quality measuring device that can easily search for faulty lines by simply connecting it to the terminal side and the exchange room side. This will be the I topic.

[Means to solve the problem]

In order to solve the above problems, the line quality measuring device of the present invention includes: (1) a network control circuit that controls connection with a partner device; and (2) a data generation circuit that modulates and sends out transmission data of test signals and control signals. ■A branch circuit that branches the modulated transmission data and the modulated reception data from the other party's device, ■A data detection circuit that demodulates and detects the reception data, ■A network control circuit, a data generation circuit, and a data detection circuit. and (2) a memory circuit that stores measurement items, the telephone number of the other party, and measurement conditions.

[Effect]

According to the line quality measuring device configured in this way, there is no need to discuss with the other party's device over the phone before measurement, and there is no need to replace the measuring device for each measurement item. Furthermore, the characteristics of the telephone line to any destination can be measured at any time.

〔Example〕

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

(First Embodiment) Fig. 1 is a circuit diagram of the first embodiment of the line quality measuring device of the present invention, and Fig. 2 is a system configuration using the line quality measuring device of the present invention on the calling side and the receiving side. FIG. 3 is a diagram showing an automatic measurement sequence. The data generation circuit 1 is ROM (R
ead 0nly Me+noly), DS P (
Digital Signal Processor)
and a D/A converter (Degttal/Analog converter). Similarly, the data detection circuit 2 is
, DSP and A/D converter (Analog/Digital
1 converter).

Specifically, the control circuit 4 controls the network control circuit 5 in accordance with the measurement conditions (measurement start time) and the telephone number of the other party's device stored in the storage circuit 3 in the device on the calling side. The network control circuit 5 goes off-hook and receives D T from the exchange.
(Dial Tone) After receiving the call, the telephone number of the other party is dialed.The exchange on the receiving side changes the polarity and sends a ring tone to the other party.

The other party goes off-hook and transmits continuity tone 1.

In the data detection circuit Ni2, after receiving the conduction tone 1, the data generation circuit 1 transmits the conduction tone 2 to the other party's device.

The exchange then reverses polarity (third
Figure (a)), then a measurement sequence is entered. The other party's device transmits a modemo training signal, and in response to the signal, the transmitting device sends a response tone and a modemo training signal. In response, the other party sends a response tone and begins various measurements (FIG. 3(b)).

Note that the conduction tone and response tone are transmitted from the first ROM 1a, and the modem training signal is transmitted from the second ROM 1b.
Ple and is sent out via the D/A converter 1d.

In addition, in various measurements, various measurement tones are transferred from the first ROM 1a to the second ROM 1a as shown in FIG. 3(c).
Measurement parameters that are control signals, print data, measurement results sent by the partner machine, etc. from M1b, and the third ROM
A pseudo-random pattern signal (hereinafter referred to as a PN pattern signal) is sent from 1c via DSPie and D/A converter 1d. The received signal is converted into a digital signal by the A/D converter 2d, and various tones are stored in the fourth ROM 2a.
The measurement parameters, print data, measurement results sent by the partner machine, etc. are demodulated in the fifth ROM 2b, and the PN pattern signal is demodulated in the sixth ROM 2c by the DSP 2e. The demodulated data is determined by the control circuit 4 and stored in the memory diagram N3.
Processing is performed according to the contents stored in the .

That is, signals are transmitted and received as in the sequence shown in FIG. 3, and the next item to be measured is selected depending on the measurement result.

Furthermore, switching between the respective ROMs may be performed using DSPIe and DSP2e, or simply by specifying an address.

Note that the second ROM 1b and the third ROM 1c each store a modulated signal. Similarly, the fifth RO
Demodulated signals are stored in M2b and the sixth ROM2c, respectively. However, the modulator is not limited to this embodiment,
It goes without saying that by providing a demodulator, each ROM can implement the present invention in storing modulated and undemodulated signals.

Figure 4 is a diagram showing the state in which the line quality measurement device holds a faulty line.0The line quality measurement device can repeatedly perform measurements at any specified time, so it is possible to measure at night or when a fault occurs. Measurements can be performed during time periods with high probability.

In the measurement operation, when a faulty line is detected, the line is put on hold and a specific tone continues to be sent.

If maintenance personnel track the tone, they can pinpoint the location of the problem. You can also switch to manual measurement while a faulty line is on hold to measure transmission characteristics in more detail.

(Second Embodiment) FIG. 5 is a circuit diagram of a second embodiment of the line quality measuring device of the present invention. The data generation circuit 1 is converted into a PN pattern generator 2f.
, SIO(Serial Input 0utp
It consists of a ut InterfaceNg, a modulator 1h, and a tone oscillator. Furthermore, measurement parameters that are control signals, print data, measurement results sent by the partner machine, etc. are sent from the control circuit 4 via Sl01g and by the modulator 1h. Additionally, various tones are emitted by tone oscillator ports.

Similarly, the data detection circuit 2 is connected to an error detector 2f,
It consists of an S I 02g, a demodulator 2h1 tone receiver 21. Furthermore, measurement parameters that are control signals, print data, measurement results sent by the other party's machine, etc. are demodulated by the demodulator 2f and determined by the control circuit 4 via Sl02g.

Additionally, the various tones are received by two tone receivers.

Other operations and sequences are the same as in the first embodiment.

Furthermore, the control circuit 4 switches between the PN pattern generator 2f and Sl01g, and between the modulator 1h and the tone oscillator 11.Similarly, the control circuit 4 switches between the error detector 2f and Sl02g, and between the demodulator 2h and the tone receiver. The switching of 21 is performed by the control circuit 4.

(Third Embodiment) FIG. 6 is a system configuration diagram in which a plurality of line quality measuring devices of the present invention are used on the originating side and the receiving side.

At a preset time, the calling party A selects the called party B, and
Automatically measure the line between A and B. After the automatic measurement between A and B is completed, next, the calling side A selects the called side C, and the line between A and C is automatically measured. Thereafter, in the same way A-D,...
Measure A-U. Furthermore, it is also possible to repeatedly measure AA, . . . AU.

In addition, if there is a link failure during measurement, it is possible to select whether to hold the relevant faulty line or to skip the relevant faulty line and measure the next line.

(Fourth Embodiment) In the first to third embodiments, the line quality measuring device of the present invention was used on both the calling and receiving sides.

On the other hand, the fourth embodiment shown in FIG. 7 uses a telephone on the calling side and a line quality measuring device of the present invention on the called side. Moreover, FIG. 8 shows the test test sequence. This is a one-way test using a simple call test. By calling the line quality measurement device on the receiving side from the filling machine, the standard signal is listened to and the call level etc. can be checked from the volume level.

〔Effect of the invention〕

As explained above, the line quality measuring device of the present invention consists of a network control circuit that controls connection with a partner device, a data generation circuit that modulates and outputs transmission data of test signals and control signals, and 1. a branching circuit that branches out transmitted data and modulated received data from a partner device, a data detection circuit that demodulates and detects the received data, and a data detection circuit that controls the network control circuit, data generation circuit, and data detection circuit. The configuration includes a control circuit that determines the output data of the device, and a storage circuit that stores the telephone number of the other party, measurement items, and measurement conditions. Therefore, there is no need to discuss with the other party over the phone before measurement, there is no need to replace the measuring device for each measurement item, and the characteristics of the telephone line to any other party can be checked at any time. Can be measured.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing a first embodiment of the present invention, FIG. 2 is a system configuration diagram using the line quality measuring device of the present invention, and FIG. 3 is a diagram showing an automatic measurement sequence of the present invention. Fig. 4 is a diagram showing a state in which the line quality measuring device holds a faulty line, Fig. 5 is a circuit diagram showing a second embodiment of the present invention, and Fig. 6 is a diagram showing the line quality measuring device of the present invention. The fourth embodiment shown in FIG. 7 is a system configuration diagram in which a plurality of units are used on the calling side and the receiving side, and a system configuration diagram in which a telephone is used on the calling side and the line quality measuring device of the present invention is used on the receiving side. is a diagram showing the test sequence in the system configuration diagram of FIG. 7, and FIG. 9 is a system configuration diagram using a conventional line quality measuring device. DESCRIPTION OF SYMBOLS 1...Data generation circuit, 2...Data detection circuit, 3...Storage circuit, 4...Control circuit, 5...Network control circuit, 6...Branch circuit.

Claims (1)

[Scope of Claims] A line quality measuring device that measures the transmission characteristics of a general subscriber telephone line, which is a line to be measured, together with an opposing party's equipment, comprising: a network control circuit that controls connection with the partner's equipment;
A data generation circuit that modulates and sends out the transmission data of test signals and control signals, a branching circuit that branches the modulated transmission data and the modulated reception data from the partner device, and data that demodulates and detects the reception data. a detection circuit, a control circuit that controls the network control circuit, the data generation circuit, and the data detection circuit and determines output data from the data detection circuit; and a control circuit that determines output data from the data detection circuit; A line quality measuring device characterized by comprising a memory circuit for storing information.