JPH02260746A - Response equipment - Google Patents

Abstract

PURPOSE:To enable the test of a telephone circuit only from the terminal equipment side by providing a response equipment with a incoming call detecting circuit, a loop forming circuit and a test data generating circuit. CONSTITUTION:When the response equipment 4 is accessed from the side of the terminal equipment 3 through an exchange 1, the incoming call detecting circuit 6 in the equipment 4 is driven and the pieces of incoming call detecting information (a), (b) are outputted. Then, the loop forming circuit 8 is activated to form a speech path. In the formation state of the speech path, the prescribed test data of a fixed level are outputted from the test data generating circuit 12 in the equipment 4, and after continuing a non-signal state for a fixed interval, the fixed level is changed and a signal repeating the output of the prescribed test data is outputted to the telephone circuit 2 concerned. Thus, the response equipment 4 is previously connected to the exchange 1 in a station. Consequently, it is unnecessary for another worker to visit the station where the exchange 1 is disposed.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a response device used for telephone line testing.

[Prior Art] For example, when a new terminal device is installed in a general home, factory, office, etc., before the terminal device actually starts to be used, a telephone is required to connect the terminal device and the central office exchange. Line (
It is necessary to conduct a quality test of the subscriber line).

Conventionally, when conducting this telephone line test, one worker is sent to the location where the terminal equipment is installed, and another worker is sent to the central office switchboard. Then, for example, a test signal oscillator is connected to the exchange, and a level meter is further connected to the terminal device via a letter coil or the like. Both workers communicate with each other and operate oscillators and level meters to measure the amount of attenuation and S/N of the audio signal on the telephone line.

[Problems to be Solved by the Invention] However, in the above-mentioned telephone line testing method, it is necessary to have workers on standby at both the terminal equipment side and the switchboard side, so a large number of workers are required. I have a report.

Furthermore, in order to conduct tests by communicating with each other between the terminal equipment side and the exchange side, it is necessary to secure a separate communication line. Furthermore, since two people must communicate with each other to conduct the test, work efficiency is significantly reduced.

Furthermore, it was difficult to measure the data error rate based on the S/N of the line.

The present invention was made in view of these circumstances, and
If you install it in advance at one end of the telephone line to be tested and make a call from the terminal device installed at the other end, the necessary signal will be automatically sent to the terminal device side, and the call will be made only from the terminal device side. It is an object of the present invention to provide a response device that can perform a line test, allow even a worker to perform the test work, and greatly improve the efficiency of the test work.

[Means for Solving the Problems] In order to solve the above problems, the answering device of the present invention includes an incoming call detection circuit that is connected to a telephone line, detects an incoming call, and outputs incoming call detection information; , a loop forming circuit that receives incoming call detection information and forms a DC loop on the telephone line, and outputs a signal to the telephone line that repeats predetermined test data at a desired level and a no-signal state at regular intervals when the DC loop is formed. The test data generation circuit is equipped with a test data generation circuit.

In another invention, in addition to the above-described incoming call detection circuit and test data generation circuit, the circuit is connected to a telephone line, receives incoming call detection information, forms a DC loop on the telephone line, and receives busy sound detection information. and a busy sound detection circuit that detects the busy sound input from the telephone line through the loop forming circuit when there is no signal and outputs busy sound detection information. be.

[Function] According to the answering device configured in this way, the answering device is connected to the telephone line to be tested via an exchange, and the terminal device is connected to the other end of the telephone line.

When the terminal device calls the answering device by dialing the telephone number assigned to the answering device, the incoming call detection circuit within the answering device is activated and outputs incoming call detection information. Then, the loop forming circuit is activated and a DC loop is formed.
A communication path is formed between this response device and the terminal device via a telephone line. Then, in the state where the communication path is formed, the test data generation circuit outputs predetermined test data at a certain level, then a no-signal state continues for a certain period of time, and then the desired test data is outputted so that the certain level changes. A signal with repeated data output is output to the telephone line.

As a result, by receiving the signal at the terminal device connected to the other end of the telephone line, the telephone line can be tested.

Further, according to the answering device of another invention, when the test on the terminal device side of the telephone line is completed and, for example, the communication path is cut off, a heavy sound is sent out from the answering device side via the exchange. The busy sound is detected by the busy sound detection circuit in the no-signal state. When the busy sound is detected, the loop forming circuit releases the DC loop and returns to the original state.

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

FIG. 2 is a schematic diagram showing a telephone line test using the answering device of the embodiment. Telephone line 2 to be tested to central office exchange 1
A large number of telephone lines are connected, including telephone ports I to be tested.
Assume that a new terminal device 3 is connected to I2 this time. The response device 4 of the embodiment is connected to one line terminal of the exchange 1 of the station 1. Note that a test telephone number is assigned to the line ζ to which this response device 4 is connected. Therefore, it is possible to call this response device 4 from the terminal device 3 via the exchange 1.

FIG. 1 is a block diagram showing a schematic configuration of the response device 4. As shown in FIG. In the figure, 5a and 5b are terminals connected to line terminals of the exchange 1. An incoming call detection circuit 6 is connected between these terminals 5a and 5b. This incoming call detection circuit 6 is composed of a calling signal detection circuit 6a and a polarity reversal detection circuit 6b. The ringing signal detection circuit 6a detects the 1611z ringing signal output from the exchange 1 and sends it to the control unit 7 as incoming call detection information a.
Send to. Further, the polarity change detection circuit 6b detects a polarity change between the input terminals 5a and 5b indicating a call from the exchange 1, and similarly sends it to the control section 7 as incoming call detection information.

Further, each of the terminals 5a and 5b is connected to a loop forming circuit 8. The loop forming circuit 8 has a built-in relay circuit, for example, and when the incoming call detection information a, b is manually inputted from the control section 7, the loop forming circuit 8 is connected to the terminal 5a.

5b to form a DC loop. That is, exchange 1
A head-off hook signal is sent to form a communication path to the telephone line 2 via the exchange 1.

Further, when the busy sound detection information C is input from the control section 7, the DC loop is canceled. That is, on-hook information is sent to the exchange 1 to cut off the communication path.

The loop forming circuit 8 is connected to a 2-wire/4-wire conversion circuit 10 via a capacitor 9 for cutting off DC components, and the 2-wire/4-wire conversion circuit 10 is connected to the test data generation circuit 1 via a relay 11.
2, and is also connected to a busy sound detection circuit 14 via a relay 13. In addition, each relay 11.13
The opening/closing is controlled by the control section 7 via the relay drive circuit 15.

The test data generation circuit 12 outputs predetermined test data at a constant level based on a command from the control unit 7, then continues a no-signal state for, for example, 30 seconds, and then performs a predetermined test in which the constant level is changed. Outputs a signal that repeats data output.

When the busy sound detection circuit 14 receives the busy sound sent from the exchange 1 via the loop forming circuit 8 during the no-signal state, it sends the busy sound detection information C to the control unit 7.

The control unit 7 is composed of, for example, a type of microcomputer, and is connected to a CPU (central processing unit) 16 that executes various information processing, a memory 18 that stores control programs and various data via a pass line 17, and a memory 18 that stores control programs and various data, and a memory 18 that stores control programs and various data. Input port 19 into which incoming call detection information a, b is input from the detection circuit 6, sends incoming call detection information a, b or busy sound detection information C to the loop forming circuit 8, and outputs a drive signal to the relay drive circuit 5. an input port 2 into which busy sound detection information C is input from the busy sound detection circuit 14;
1, and the output boat 22 that outputs start/stop commands to the test data generation circuit 12.

When the answering device 4 having such a configuration is connected to the exchange 1 and the terminal device 3 is used to test the telephone line 2, the terminal device 3. The operations of the exchange 1 and the response device 4 will be explained using the sequence diagram of FIG.

First, the operator conducting the test must transmit data from the terminal device 3. When $ is read, an off-hook signal is sent from the terminal device 3 to the exchange 1. Subsequently, by operating the dial and inputting the telephone number assigned to answering device 4, the telephone number is sent to exchange 1. The exchange 1, which has received the telephone number, sends a calling signal to the answering device ff14 to which this telephone number has been assigned.

In the answering device 4, a calling signal input from terminals 5a and 5b is detected by a calling detection circuit 6a in an incoming call detection circuit 6, and incoming call detection information a is sent to a control section 7. When the control unit 7 receives the incoming call detection information a through the input port 19, it sends the incoming call detection information a to the loop forming circuit 8. Then, the loop forming circuit 8 forms a DC loop between the terminals 5a and 5b. That is, an off-hook signal is sent to the exchange 1, and a communication path is formed between the response device 4 and the terminal device 3 via the telephone line 2.

Thus, the control section 7 closes each relay 11, 13 and activates the test data generation circuit 12. When the test data generation circuit 12 is activated, it starts outputting test data as shown in the figure. The test data outputted from the test data generation circuit 12 is sent to the loop forming circuit 8 and the terminal 5a.
, 5BS exchange 1 and telephone line 2 to the terminal device 3.

Then, on the terminal device 3 side, a test is performed to measure the error rate of each data at the signal level of the test data using, for example, a level meter and an error rate measuring device.

When the series of tests is completed, the transmitting state of the terminal device 3 is stopped, the exchange 1 sends an on-hook signal, and the exchange 1 sends out a heaving sound to the response device 4.

In the response device 4, the busy sound is detected by the busy sound detection circuit 1.
4, but during the period when the test data is output from the test data generation circuit 12, the test data is erased, so the busy sound is detected in the no signal state and the busy sound detection information C is controlled. Send it to section 7.

Upon receiving the busy sound detection information C, the control section 7 sends the busy sound detection information C to the loop forming circuit 8 to release the DC loop. When the DC loop is released, this response device 4
An on-hook signal is sent to exchange 1 from the switch 1. Also,
The control section 7 opens each relay 11, 13 and stops the operation of the test data generation circuit 12.

According to the answering device 4 configured in this way, the answering device 4 is connected to the line terminal of the assigned telephone number in the exchange 1 to which the telephone line 2 to be tested is connected, and the terminal device 3 is connected to the terminal device 3 to be tested. Connect to the other end of the telephone line 2. Then, when the terminal device 3 side dials the telephone number assigned to this answering device 4 and calls the answering device 4 via the exchange 1, the incoming call detection circuit 6 in the answering device 4 is activated and the incoming call detection information a , b. Then, the loop forming circuit 8
operates to form a DC loop, and a communication path is formed between this response device 4 and the terminal device 3 via the telephone line 2 to be tested. Then, in the state where the communication path is formed, predetermined test data at a constant level is output from the test data generation circuit 12 in the response device 4, and after a no-signal state continues for a fixed interval, the predetermined test data is changed from the above-mentioned constant level. A signal repeating the output is output to the corresponding telephone line 2.

As a result, the terminal device 3 connected to the other end of the telephone line 2 receives the test data, and thereby the telephone line 2 is tested.

In this way, if the answering device 4 is connected to the exchange 1 of the central office in advance, each time the telephone line 2 is tested, another worker goes to the office where the exchange 1 is installed and connects the terminal equipment. There is no need to conduct test work on the telephone line 2 while communicating with the worker on the 3rd side.

Therefore, even - number of workers can reliably test the telephone line 2, and the efficiency of the test work can be greatly improved.

Furthermore, when a series of test operations for the telephone line 2 are completed on the terminal device 3 side, and even if the transmission state is stopped and the call loop is cut off, the answering device side sends out a 4-heavy tone via the exchange 1. This busy sound is detected by the busy sound detection circuit 14 in a no-signal state where no single tone signal is output. When the busy sound is detected, the loop forming circuit 8 releases the DC loop and returns to the original no-call state. That is, upon completion of a series of tests, it is possible to automatically return the response device 4 to the operated state. Therefore, the response device 4 may be left alone for a period from the end of the test on one telephone line 2 until the start of the test on the next telephone line.

FIG. 4 is a schematic diagram showing a test method for testing a plurality of telephone lines using the answering device 4 configured as described above.

That is, in a telephone network consisting of one master station exchange 31 and a plurality of slave exchanges 32 and 33, there is usually a connection from terminal device B to terminal device A, or from terminal device C to terminal device A.
It is often sent to. In this case, if a call failure occurs in a call state from terminal device B to terminal device A or from terminal device C to terminal device A, instead of calling terminal device A from terminal device B or terminal device C, terminal device A By calling the answering device 4 connected to the exchange 31 to which the answering device 4 is connected, the answering device 4 automatically returns a test signal consisting of predetermined test data at a certain level and a no-signal state to the terminal device B or the terminal device C. Ru. Therefore, deterioration in line quality of each telephone line can be easily determined by hearing or the like.

In addition, if a level meter or noise meter is connected to terminal device B and terminal device C via a letter coil etc. instead of the terminal device, transmission characteristics such as the attenuation amount and S/N of the telephone line can be quantitatively observed. can.

Note that the present invention is not limited to the embodiments described above. In the embodiment, as a means for terminating the operation of sending a test signal in the response device 4, a busy sound sent from the exchange 1 is detected, and the loop forming circuit 8 is released using the detection information of the busy sound. For example, by providing a timer circuit or the like, when test data is sent from the test data generation circuit 12 for a certain period of time or more, the loop forming circuit 8.
It may also be possible to release the .

[Effects of the Invention] As explained above, according to the present invention, the answering device of the present invention is installed in advance at one end of the telephone line to be tested, and a terminal device installed at the other end is used to call this answering device. Once the test data is sent, the necessary predetermined test data is automatically sent to the terminal device via the telephone line. Therefore, since it is possible to test the telephone line only from the terminal device side, for example, even a worker can perform the test work reliably, and compared to the conventional case where the test is carried out by communicating with each other, the test work is much easier. Efficiency can be greatly improved.

[Brief explanation of drawings]

The figures show a response device according to an embodiment of the present invention, FIG. 1 is a block diagram showing the response device, and FIG. 2 is a diagram for explaining a test method using the response device of the embodiment. , FIG. 3 is a sequence diagram showing the transmission and reception of signals in a telephone line test, and FIG. 4 is a diagram showing a method of testing a telephone line when a plurality of exchanges are involved. DESCRIPTION OF SYMBOLS 1... Switchboard, 2... Telephone line, 3... Terminal device, 4... Answering device, 6... Incoming call detection circuit, 7...
Control unit, 8... loop forming circuit, 10... 2 wires/4
Line conversion circuit, 11. 13... Relay 12... Test data generation circuit, 14... Busy sound detection circuit, 16.
...CPU. Applicant's agent Patent attorney Takehiko Suzue

Claims (2)

[Claims] (1) An incoming call detection circuit (6) connected to a telephone line, which detects an incoming call and outputs incoming call detection information; a loop forming circuit (8) for forming a loop, and a test data generating circuit (12) for outputting a signal that repeats predetermined test data at a desired level and a no-signal state at regular intervals to the telephone line during the DC loop forming state. A response device equipped with (2) an incoming call detection circuit (6) connected to a telephone line, which detects an incoming call and outputs incoming call detection information; a loop forming circuit (8) that receives busy sound detection information and cancels the DC loop; and during the DC loop forming state, repeats predetermined test data at a desired level and a no-signal state at regular intervals. a test data generation circuit (12) that outputs a signal to the telephone line;
A response device comprising a busy sound detection circuit (14) that detects a busy sound input from the telephone line via the loop forming circuit during the no-signal state and outputs busy sound detection information.