JPH0697924A - Remote testing system inter-terminal equipments - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a remote test system between terminal equipments in a wireless line, and confirms a function capable of efficiently and smoothly performing a switching logic operation test remotely and in units of stations. The purpose is to be able to realize by enabling. A line switching device 3 having a line fault detecting means 7 for detecting a line fault and a line switching means 8 capable of switching between a working line and a protection line in one terminal device 1,
When receiving the line failure information from the line switching device 3, it sends a parallel transmission command to the other terminal station device 2 opposite thereto, and when it receives a parallel transmission response from the other terminal device 2, the line switching device 3 receives the line switching command. And a line switching control device 4 having a line switching logic means 11 for transmitting a line, and the line switching device 3 receives a command from the other terminal device 2 by remote control, and the line switching control device 4 switches the line. Test signal generating means 10 for generating a test signal for testing the logic means 11.
It is configured to have.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remote test system between terminal equipments in a wireless line.

[0002]

2. Description of the Related Art In wireless communication between terminal equipments, when a line failure occurs, there is a function of the terminal equipment that can automatically change from a working line to a protection line. The part of the switching logic that controls this changing operation is composed of software. Conventionally, as a form of a system used for testing a communication line at the time of changing the line, there is a form in which a line switching device (AC) and a line switching control device (AS) are provided for each station. .

Here, the line switching device performs a switching operation between a working line and a protection line in a wireless line, and is composed of hardware. The line switching control device
Controls the operation of this line switching device, and
It is composed of a U-mounted panel and operates under software control. FIG. 5 shows main parts of the line switching control devices 110 and 210 and the line monitoring control device 10.
The relationship between 0, 200 and the centralized monitoring station 300 is shown. Here, one station (station A) is the line monitoring controller 10
0 and the line switching control device 110, and the other station (B station) is configured to include the line monitoring control device 200, the line switching control device 210, and the centralized monitoring station information processing unit 220. ing.

In FIG. 5, the line monitoring control device 100 of the station A manages the states of lines and communication devices used in wireless communication, and includes a line monitoring unit 101 and a device monitoring unit 102. Is configured. The line switching control device 110 sends a line switching command to the line switching device, and includes a line switching logic unit 111 and an interface unit 112.

Further, the line supervisory controller 20 in the B station
For 0, as in the case of station A, the line monitoring unit 201
And the device monitoring unit 202, and the line switching control device 210 is also the same as that of the A station.
It has a line switching logic unit 211 and an interface unit 212. The centralized monitoring station station information processing unit 220 interfaces data with the centralized monitoring station 300, and communicates between the centralized monitoring station 300 and the line supervisory control device 200 and the line switching control unit 210. Connected through.

The centralized monitoring station 300 monitors all the states of the network. As a method of collecting information, station B collects the information of station A in a polling format, puts its own station information on it, and transmits it to the centralized monitoring station 300. Regarding the control, the central monitoring station sends a control signal together with the station number to the B station, and the B station gives control to other stations in a polling format.

As described above, as a mode for monitoring a wireless line as a remote test system between terminal station devices, each station is equipped with a line switching device and a line switching control device. FIG. 3 is a block diagram showing a main part of a line switching device and a line switching control device provided for each of these stations. In FIG. 6, 120 is a line switching device, 111 is a line switching logic unit, and this line switching logic unit 111 is
This corresponds to the line switching logic unit 111 in the line switching control device 110 of the A station in FIG.

Reference numeral 111-1 is a switching operation logic unit, and this switching operation logic unit 111-1 is equipped with a CPU and sends current switching information to the line monitoring unit 100. is there. Reference numeral 111-2 is a line switching information sending unit, and this line switching information sending unit 111-2 sends a line switching command. And 111-3
Is an AC interface unit, and this AC interface unit 111-3 puts line data from the line switching device 120 on the bus.

The switching operation logic unit 111-1, the line switching information sending unit 111-2, and the AC interface unit 111-3 are connected to each other by a bus line.
By the way, 121 is a line state detection unit, and this line state detection unit 121 detects a line failure.
Have ~ N lines. 122 is a transmission / reception end switch, and this transmission / reception end switch 122 is
This is to select the parallel transmission command output from the line switching device and the receiving end command input from the line switching control device.

Reference numeral 123 is an AS interface section,
The AS interface unit 123 interfaces a signal output to the line switching control device. The interface with the AS is different for each system, and the contact passing is divided into serial data depending on the number of signals. The conventional line switching operation between the terminal devices having such a configuration will be described with reference to FIGS. 7 and 8.

First, in FIG. 7, when the line fault is recognized in the receiving portion of the station A, the line switching unit 120 notifies the line switching control unit (AS) 110 of the line fault occurrence [see (1)] and the signal thereof. Line switching control device of station A (A
S) 110 is a line switching control device (A
S) Send a parallel transmission command for the relevant line to 210 [see (2)].

The line switching control device (AS) 210 of the B station, which has received the sending and receiving instruction, is the line switching device (AC) 220 of the B station.
To the line switching control device (AS) 110 of the station A, by waiting for the transmission completion notification from the line switching device (AC) 220 [see (4)]. A parallel response is returned [see (5)]. When the line switching control device (AS) 110 of the A station receives the parallel transmission response from the B station, the A
The receiving end switching control is given to the line switching device (AC) 120 of the station [see (6)], and the line switching device (AC) 1 of the station A
The receiving end switch is switched at 20 and the response is returned to the line switching control device (AS) 110 [see (7)], and the switching operation is completed.

Further, in the switching back operation, as shown in FIG. 8, the response operation is repeated in reverse of the switching operation. That is, when the reception of the station A recognizes the line restoration, the line switching device 120 notifies the line switching control device (AS) 110 of the line restoration [see (1)], and the line of the station A which receives the signal. The switching control device (AS) 110 is a line switching device (AC) 1 of the same station.
The receiving end release control of the relevant line is given to 20 [see (2)], the receiving end switch is switched by the line switching device (AC) 120 of the A station, and the response is sent to the line switching control device (AS) 1
In response to the response signal, the line switching control device (AS) 110 receives the response signal, and the line switching control device (AS) 210 of the B station of the partner terminal station de-serializes the line. Send an instruction [see (4)].

The line switching control device (A
S) 210 gives the control of deserialization to the line switching device (AC) 220 of station B [see (5)], and the line switching device (AC) 220 switches the line switching control device (AS) 210.
On the other hand, the switching back operation is completed in response to the response of the completion of the parallel transfer release.

[0015]

However, in such a conventional remote test system between terminal station devices, there is a case where a centralized monitoring station in a wireless circuit monitors a number of unmanned routes. In performing the test of the line switching operation between the stations in this case, it is still in the state of relying on human hands. The changeover switch is made up of hardware, but the part of the changeover logic that controls its operation is made up of software.

Further, as a current trend, in fixed multiplex wireless communication, due to the influence of improvement of line reliability and transmission efficiency,
The switching function also tends to introduce synchronous switching, matrix switching, etc., and the switching logic has become complicated, and the possibility of specification changes and software bugs is increasing. For this reason, when there is a frequent change in the switching logic, there is no test for confirming the operation after the change. However, there is a problem to establish an efficient test method.

The present invention was devised in view of the above problems, and realizes a function capable of efficiently and smoothly performing a switching logic operation test by enabling confirmation remotely and in units of stations. It is an object of the present invention to provide a remote test system between terminal devices which is made possible.

[0018]

FIG. 1 is a block diagram of the principle of the present invention. In FIG. 1, 1 is one terminal station device, and this terminal station device 1 is a line switching device 3 and a line switching control. It is configured to include the device 4. Reference numeral 2 denotes the other terminal station apparatus, and this terminal station apparatus 2 is configured to include a line switching device 5 and a line switching control device 6 like the terminal station device 1.

Here, the line switching devices 3 and 5 perform a switching operation between a working line and a protection line in a wireless line, and at least the line switching device 3 has a line failure detecting means 7 and a line switching means 8. And a selecting means 9 and a test signal generating means 10. The line switching control devices 4 and 6 control the operation of the line switching device, and at least the line switching control device 4 has a line switching logic means 11.

The line fault detecting means 7 detects a line fault. The line switching means 8 can switch between the working line and the protection line. The selecting means 9 receives the fault detection signal from the line fault detecting means 7 or the control signal from the line switching control device 4, and transfers it from the test signal generating means 10 to the line switching control device 6 via the line switching control device 4. Of the control signals transferred from the line switching control device 4 to the line switching means 8 is selected.

The test signal generating means 10 is the line switching device 3
In response to a remote control command from the other terminal device,
A test signal for testing the line switching logic means 11 in the line switching control device 4 is generated. When the line switching logic means 11 receives the line fault information from the line switching device 3, it sends a parallel transmission command to the other terminal device that opposes it, and when it receives a parallel transmission response from the other terminal device, the line switching device 3 A line switching command is sent to.

Reference numeral 12 is a parallel / parallel command returning means. The parallel / parallel command returning means 12 returns the parallel / parallel command and is provided to the line switching control device 6 in the other terminal equipment. .

[0023]

In the switching logic operation test in the remote test system between the terminal equipments of the present invention described above, when the switching logic of one terminal equipment 1 is changed, the switching logic operation test is performed by remote operation from the centralized monitoring station. A control signal to the effect that the above is performed is sent to the selecting means 9 and the test signal generating means 10 via the other terminal device 2.

When this signal is transmitted, the selection means 9
Does not select the signal from the line switching means 8 and the signal from the line failure detection means 7, but selects the test signal from the test signal generation means 10. The selected test signal is transmitted through the line switching control device 4 to the line switching control device 6 of the other terminal station device 2.
Sent to. Here, also in the other terminal device 2, preparations are made for the switching logic operation test of the one terminal device 1 from the centralized monitoring station. That is, in the line switching control device of the terminal device 2, the sending and receiving command returning means 12 is prepared to return the sending and receiving command from the terminal device 1.

Here, the sending and receiving instruction is folded back,
The parallel transmission response is transferred to the line switching control device 4 of one terminal station device 1. When it is confirmed from the parallel transmission response that the line switching logic is operating normally, the line switching logic operation test ends. Further, in the switching operation due to the line fault in the remote test system between the terminal devices of the present invention described above, first, when the line fault detecting means 7 detects the line fault,
The line switching control device 4 is notified of the line failure occurrence via the selecting means 9. Receiving the signal, the line switching control device 4 in one terminal station device sends a parallel transmission command to the line switching control device 6 in the other terminal device.

The line switching control device 6 which has received the sending and receiving instruction,
The transmission switching control is given to the line switching device 5. Then, after waiting for the transmission parallel completion notification from the line switching device 5, the transmission parallel response is returned to the line switching control device 4 of one terminal station device 1. The line switching control device 4 in one terminal station device, when receiving the parallel transmission response from the other station, gives the receiving end switching control to the line switching device 3 in one station, and the line switching device 3 in one station. The line end switching means 8 switches the receiving end switch. Then, the response is returned to the line switching control device 4, and the switching operation is completed.

In the switching back operation, when the line failure detecting means 7 recognizes the line recovery, the line switching control device 4 is notified of the line recovery via the selecting means 9. Upon receiving the signal, the line switching control device 4 gives the line switching device 3 of the same station control for releasing the receiving end of the corresponding line, and the line switching device 3
The line end switching means 8 switches the receiving end switch.

The response is returned to the line switching control device 4, and the line switching control device 4 receiving the response signal sends a command for deserializing the relevant line to the line switching control device 6 of the other station. Receiving the command, the line switching control device 6 gives control of de-sending to the line switching device 5 of the same station, and receives a response from the line switching device 5 to the line switching control device 6 to complete de-sending. The switching back operation is completed.

[0029]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a block diagram showing an embodiment of the present invention, in which FIG. 2 is an arrangement between one terminal station device (A station) 1 and the other terminal station device (B station) 2 and a centralized monitoring station 70. It shows a relationship.

In FIG. 2, reference numeral 50 is a line switching control device, and this line switching control device 50 controls the line switching when a failure occurs.
A line switching logic unit (line switching logic means) 51 and a communication processing unit 52 are provided. Here, the line switching logic unit 51 includes a line switching logic unit 51-1, a line monitoring information transmission unit (transmission parallel instruction returning unit) 51-2, and a register 5.
1-3, format converter 51-4.

The line switching logic unit 51-1 stores a program that allows the line switching device 30 to switch the line with a required algorithm, and is composed of a storage device, a CPU, and the like. Line monitoring information sending unit 5
Reference numeral 1-2 is for converting the signal for line switching sent from the line switching logic unit 51-1 from a parallel signal to a serial signal, and has a configuration as shown in FIG. .

In FIG. 4, reference numeral 51-21 is a signal converter, and this signal converter 51-21 converts the parallel signal from the A station 1 into a serial signal and selects the selector 51.
It outputs to the -22, converts the serial signal from the B station 2 into a parallel signal, and sends it to the bus line of the A station 1. Further, the selector 51-22 selects one of the line switching information input from the A station 1 and the line switching information input from the B station 2 and sends the selected information to the B station 2. It operates so as to receive a control signal from the monitoring station 70.

By the way, the register 51-3 shown in FIG.
Is a circuit for temporarily storing a signal for line switching, which is sent from the line switching logic unit 51-1. The format conversion section 51-4 interfaces a control signal to the line switching device 30. Then, the communication processing unit 52
Is for interfacing and transmitting a signal or the like of a parallel transmission command to the B station 2.

Reference numeral 20 denotes a line monitoring control device, and this line monitoring control device 20 monitors the state of a device used in wireless communication and the line state, and the device monitoring section 2
1 and a line monitoring unit 22. The device monitoring unit 21 monitors the state of communication devices, and includes a logic unit 21-1, a monitoring unit 21-2, and a control unit 21-.
3 and the communication unit 21-4.

The logic unit 21-1 stores a program capable of monitoring a device with a required algorithm, and is composed of a storage device, a CPU and the like. The monitoring unit 21-2 detects the state of the device. The control unit 21-3 sends a control signal to the line switching device 30 according to the device state. Specifically, for devices for which the line change program has been rewritten,
A control signal for generating pseudo data (test signal) for testing a device is output to the selector 36 in the line switching device 30.

The communication unit 21-4 receives information about the device status from the B station 2 and sends information about the device status of the A station 1 to the centralized monitoring station. The line monitoring unit 22 monitors the line status,
It comprises a logic unit 22-1, a register 22-2, a format conversion unit 22-3, and a communication unit 22-4.

The logic unit 22-1 stores a program that enables line monitoring with a required algorithm, and is composed of a storage device, a CPU, and the like. The register 22-2 is used for the line monitoring information (line state information) input from the A station 1 and other stations, and the line switching device 30.
The information about the line switching input from is temporarily stored.

Then, the format conversion section 22-3 is
The communication unit 22-4 is for interfacing signals related to line switching input from the line switching device 30, and the communication unit 22-4 inputs line monitoring information from the line monitoring information transmitting unit 51-2 and monitors the line for the A station 1. The information is transmitted to other stations. The line switching device 30 performs a switching operation between a working line and a protection line in a wireless line, and includes a switch unit 31, a line state monitoring unit (line fault detection unit) 32, and a pseudo data transmission unit (test signal generation unit). ) 33
And a driver (DRV) 34, a format converter 35, and a selector (selection means) 36.

The switch section 31 includes a selector 36 and a DR.
The line is switched from the working line to the standby line by a control signal input via V34. The line state monitoring unit (line fault detecting means) 32 can detect a line fault. The pseudo data sending unit 33 receives the control signal from the line device monitoring unit 21 at the time when the rewriting of the program is completed, and sends the pseudo data to the partner station to test whether the device of the A station 1 operates normally. To do.

As shown in FIG. 3, the selector 36 has two selectors. Of these, one selector selects one of the information regarding the line switching from the switch unit 31 and the pseudo data from the pseudo data transmission unit 33 and transmits it to the other station, and the other selector One of the line status monitoring information from the line status monitoring unit 32 and the pseudo data from the pseudo data sending unit 33 is selected and sent to another station.

The format conversion section 35 interfaces the signal output from the selector 36 and sends it out. The line monitoring control device 20b and the line switching control device 50b in the B station 2 also have the same functions as the line monitoring control device 20 and the line switching control device 50. That is, the line monitoring controller 20b has a device monitoring unit 21b having the same function as the device monitoring unit 21.
And the line monitoring unit 22 having the same function as the line monitoring unit 22.
b, and the line switching control device 50b is configured to include a line switching logic unit 51b having the same function as the line switching logic unit 51 and a communication processing unit 52b having the same function as the communication processing unit 52. .

Although not shown in FIG. 2,
The line monitoring information sending unit in the line switching logic unit 51b also has the same function as the line monitoring information sending unit 51-2 shown in FIG. Further, the line switching device 30 is similarly provided. Reference numeral 60 denotes a centralized monitoring station information processing unit. The centralized monitoring station information processing unit 60 is a central monitoring station 7
0 is an interface for signals between the terminal devices 1 and 2, and the centralized monitoring station 70 monitors the line status and equipment status of the terminal devices that compose the network.

The operation of the switching logic operation test at the time of changing the program (switching logic) relating to the line switching with the above configuration will be described below. When the switching logic of one terminal device (A station) 1 is changed, a control signal for performing the switching logic operation test is remotely operated from the centralized monitoring station 70.
It is transferred to the device monitoring unit 21 in the A station 1.

When the equipment monitoring section 21 receives the control signal, the operation of the logic section 21-1 causes the control section 21-3 to select the selector 36 and the pseudo data transmission section 3 in the line switching device 30.
A control signal is sent to the terminal 3. This signal is a control signal for outputting the pseudo data from the pseudo data transmission unit 33 to the B station 2. Therefore, when this signal is transmitted, in the line switching device 30 shown in FIG. 3, the selector 36 does not select the signal from the switch unit 31 and the signal from the line state monitoring unit 32, but from the pseudo data transmission unit 33. Select the pseudo data of.

The selected pseudo data is sent to the line switching logic unit 51b of the B station 2 through the line switching control device 50. Here, also in the B station 2, from the central monitoring station 70 to the A
It corresponds to performing the switching logic operation test of the station 1.
In other words, the pseudo data is prepared to be folded back. That is, from the device monitoring unit 21b to the line switching logic unit 51b,
A control signal indicating that the switching logic operation test of station A is to be performed is output.

When this control signal is received, it is shown in FIG.
In the line switching logic unit 51b (of the station), the line switching information (pseudo data) input by returning from the A station 1 is selected by the selector 51-22b shown in FIG. Then, this pseudo data is input again to the line switching logic unit 51 and the line monitoring unit 22 of the A station 1. When it is confirmed by the signal transferred to the line monitoring unit 22 that the line switching logic is operating normally, the line switching logic operation test ends.

Although the case where the line switching logic of station A 1 is changed has been described here, the same test can be performed when the line switching logic of station B 2 is changed. By the way, the actual line switching and switching back operation is performed as already described in FIGS. 7 and 8.

That is, when the line status monitor 32 detects a line failure, the line switching controller 5 is operated via the selector 36.
The line switching logic unit 51 at 0 is notified of the line failure occurrence. The line switching logic unit 51 of the A station 1 receiving the signal,
Through the line monitoring information transmitting unit 51-2, the line monitoring unit 22 is notified of the occurrence of a line failure, and the B station 2
A parallel transmission command is sent to the line switching control device 50b.

The line switching control device 50b which has received the sending and receiving instruction
Gives parallel transmission control to the line switching device of the B station 2.
Then, after waiting for the notice of parallel transmission from the line switching device of station B 2, it returns a parallel transmission response to the line switching control device 50 of station A 1. The line switching control device 50 in station A 1
When the parallel transmission response from the B station 2 is received, the receiving end switching control is given to the line switching device 30 of the A station 1, and the operation of the selector 36 is controlled to be received by the switch section 31 of the line switching device 30 of the A station 1. The end switch is switched, the response is returned to the line switching control device 50, and the switching operation is completed.

In the switching back operation, when the line status monitoring unit 32 recognizes the line restoration, the line switching control unit 50
The line restoration is notified via the selector 36. The line switching control device 50 receiving the signal changes the line switching device 3 of the same station.
The receiving end release control of the corresponding line is given to 0, and the receiving end switch is switched by the switch unit 31 in the line switching device 30.

The response is returned to the line switching control device 50,
Upon receiving the response signal, the line switching control device 4 sends a command for releasing the parallel transmission of the corresponding line to the line switching control device 50b of the B station 2. The line switching control device 50b that received the command
The parallel switching control is given to the line switching device of the B station 2,
When the line switching control device 50b receives a response from the line switching control device 50b indicating that the parallel transfer cancellation is completed, the switching back operation is completed.

As described above, a line switching device 30 having a terminal device and a line state monitoring unit 32, a switch unit 31, and a pseudo data sending unit 33 is provided in one terminal device (A station) 1. By providing the line switching control device 50 having the line switching logic unit 51, when the line failure information is received from the line switching device 30, the parallel transmission command is sent to the other terminal device (station B) 2 that opposes, When receiving the transmission response from the B station 2, a line switching command can be sent to the line switching device 30, and the line switching device 30 receives a command from the B station 2 by remote control, and the line switching control device 50 receives the command. Pseudo data for testing the line switching logic 51 can be generated.

The station B 2 also has the same line switching device 30b and the line switching control device 50b as the station A 1, but the line switching logic unit 51b in the line switching control device 50b receives the parallel transmission command. By providing a loopback function, it becomes possible to perform a line switching confirmation test for each station without performing communication via another station.

[0054]

As described above in detail, according to the remote test system for the terminal equipment of the present invention, the terminal equipment connected via the wireless line is provided, and one of the terminal equipments has a line failure. Line failure detecting means for detecting a line failure, and a line switching device having a line switching means capable of switching between the working line and the protection line, and the other of the two which opposes the parallel transmission command when receiving line failure information from the line switching device. A line switching control device having a line switching logic means for transmitting a line switching command to the line switching device when receiving a parallel response from the other terminal device while transmitting to the terminal device. By the provision of the test signal generating means for generating the test signal for testing the line switching logic means in the line switching control device in response to the instruction from the terminal device of the remote control,
The tester can efficiently perform the test without going to the corresponding terminal device.

Further, in the above remote test system between the terminal equipments, the line switching control device in the other terminal equipment is provided with the sending and receiving instruction returning means for returning the sending and receiving instruction, so that the switching logical operation test is performed. Can be performed remotely and on a station-by-station basis, and there is an advantage that it is not necessary to go through another terminal station device.

[Brief description of drawings]

FIG. 1 is a principle block diagram of the present invention.

FIG. 2 is a block diagram showing an embodiment of the present invention.

FIG. 3 is a block diagram showing a selector in the line switching device.

FIG. 4 is a block diagram showing a line monitoring information sending unit in the line switching logic unit.

FIG. 5 is a block diagram showing a main part of a conventional example.

FIG. 6 is a block diagram showing a main part of a conventional example.

FIG. 7 is a diagram illustrating a line switching operation.

FIG. 8 is a diagram illustrating a line switching back operation.

[Explanation of symbols]

1 Terminal device (A station) 2 Other terminal device (B station) 3, 5, 30, 120, 220 Line switching device 4, 6, 50, 50b, 110, 210 Line switching control device 7 Line failure Detecting means 8 Line switching means 9 Select means 10 Test signal generating means 11 Line switching logic means 12 Transmission and parallel command folding means 20, 20b, 100, 200 Line monitoring control devices 21, 21b, 102, 202 Equipment monitoring unit 21-1, 22-1 Logic part 21-2 Monitoring part 21-3 Control part 21-4, 22-4 Communication part 22-2, 51-3 Register 22-3, 35, 51-4 Format conversion part 22, 22b, 101, 201 line monitoring unit 31 switch unit (line switching unit) 32 line state monitoring unit (line failure detection unit) 33 pseudo data transmission unit (test signal generation unit) 34 DRV 36 Selector (selecting means) 51-22, 51-22b Selector 51, 51b Line switching logic unit (line switching logic means) 51-1 Line switching logic unit 51-2, 51-2b Line monitoring information sending unit 51-21, 51 -21b Signal conversion unit 52, 52b Communication processing unit 60, 220 Centralized monitoring station information processing unit 70,300 Centralized monitoring station 111, 211 Line switching logic unit 112,212 Interface unit 111-1 Switching operation logic unit 111-2 Line switching information transmission unit 111-3 AC interface unit 121 Line state detection unit 122 Transmission / reception end switch 123 AS interface unit

Claims (2)

[Claims] 1. A line fault detecting means (7) for detecting a line fault, which comprises terminal devices (1, 2) connected via a wireless line, and one of the terminal devices (1) is a working line. Line switching means (8) capable of switching between the backup line and the protection line
And a line switching device (3) having the following: When receiving line failure information from the line switching device (3), a parallel transmission command is sent to the other terminal device (2) opposite to the other terminal device. A line switching control device (4) having a line switching logic means (11) for sending a line switching command to the line switching device (3) when receiving a transmission response from the line switching device (3). ) Receives a command from the other terminal device (2) by remote control, and generates a test signal for testing the line switching logic means (11) in the line switching control device (4). A remote test system between terminal equipment, characterized in that signal generating means (10) is provided. 2. A line fault detecting means (7) for detecting a line fault, which comprises terminal devices (1, 2) connected via a wireless line, and one of the terminal devices (1) has a working line. Line switching means (8) capable of switching between the backup line and the protection line
And a line switching device (3) having the following: When receiving line failure information from the line switching device (3), a parallel transmission command is sent to the other terminal device (2) opposite to the other terminal device. A line switching control device (4) having a line switching logic means (11) for sending a line switching command to the line switching device (3) when receiving a transmission response from the line switching device (3). ) Receives a command from the other terminal device (2) by remote control, and generates a test signal for testing the line switching logic means (11) in the line switching control device (4). The signal generating means (10) is provided, and the line switching control device (6) in the other terminal device (2) is provided with a parallel / parallel command folding means (12) for folding the parallel / parallel command. Remote test system between terminal devices Beam.