JPH0799820B2 - Line switching device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a communication line for transmitting voice signals, data signals, video signals and other various electric signals, and a line switching device for transmitting electric signals in a transmission line. It is about.

(Prior Art) Line switching means switching from line A, which is a working line, to line B, as shown in FIG. At this time,
Due to the switching work, there is a temporary disconnection between terminals 13 and 14,
It is a serious service problem that the connection is lost after switching due to a connection error.

Conventionally, the switching line is performed by changing the jumper wiring from the working line to the protection line on the terminal board which is the connection point of the lines on the sending end side and the receiving end side. Specifically, for example, a method of temporarily stopping the transmission of electric signals and replacing the jumper wiring, a state in which jumper wiring is multi-connected while the electric signals are still being transmitted and the temporary electric signals are transmitted to both the working line and the protection line. After that, there are a method of switching to the protection line by removing the jumper wiring connected to the working line, a method of pulling both the working circuit and the protection line into a switch and switching the line by switching the switch.

(Problems to be solved by the invention) However, in these conventional methods, the position of the line on the terminal board or the connection with the switch was visually checked with reference to the correspondence table of the terminal position and the line. It was not possible to completely prevent the signal disconnection due to the connection.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the drawback that the connection state including the polarity cannot be confirmed in the conventional line switching, and to provide a line switching device in which signal disconnection due to erroneous connection does not occur.

(Means for Solving the Problem) A feature of the present invention is that an electric signal is transmitted through a first line (working line) in use, which is transmitting an electric signal, on the sending end side and the receiving end side. Switch to the second line (standby line) that is not idle and set the first line to the
In the line switching device that puts the line into use, the sending end has a first input terminal for inputting an electric signal, a first output terminal for outputting the electric signal to the first line, and an electric signal for the first line. A second output terminal for outputting to the second line; a first switch inserted between the first input terminal and the first output terminal; the first input terminal and the second switch; Second and third switches inserted between the output terminal and the first switch;
A first adapter that can be collectively connected to all or some of the terminals on the terminal board to which the input terminal of is connected, and all or some of the terminals on the terminal board to which the first line is connected. A second adapter that can be collectively connected, a third adapter that can be collectively connected to all or a part of terminals on a terminal board to which the second line is connected, the first adapter, and the first adapter
A first switch group inserted between the second adapter and the first output terminal, and a third switch group inserted between the second adapter and the first output terminal. A third switch group inserted between the second output terminal, a variable resistor connected to the first input terminal, and a first pulse wave connected to the first input terminal. A generator and a first voltmeter connected to the first input terminal,
A second voltmeter connected to the first output terminal, a third voltmeter connected to the second output terminal, and the first voltmeter
A first pulse pattern detector connected to the output terminal of the first output terminal, a second pulse pattern detector connected to the second output terminal, and a sine wave of the same phase to the first output terminal pair. A first oscillator, a second oscillator that outputs a sine wave of the same phase to the pair of second output terminals, and a first detector that can detect the sine wave, and the receiving end side is A second input terminal for inputting an electric signal from the first line, a third input terminal for inputting an electric signal from the second line, a third output terminal for outputting an electric signal, and the second A fourth switch inserted between the third input terminal and the third output terminal, a fifth switch inserted between the third input terminal and the third output terminal, and the first switch. A fourth adapter capable of being collectively connected to all or a part of the terminal board to which the line is connected; A fifth adapter that can be collectively connected to all or some of the terminals on the terminal board to which the wire is connected, and all or some of the terminals on the terminal board to which the third output terminal is connected A connectable sixth adapter,
A fourth switch group inserted between the fourth adapter and the second input terminal, and a fifth switch group inserted between the fifth adapter and the third input terminal A sixth switch group inserted between the sixth adapter and the third input terminal, a fourth voltmeter connected to the second input terminal, and the third input A fifth voltmeter connected to the terminal; a sixth voltmeter connected to the third output terminal; a third pulse pattern detector connected to the second input terminal; A fourth pulse pattern detector connected to the third input terminal, a fifth pulse pattern detector connected to the third output terminal, and an in-phase sine wave to the second input terminal pair. And a fourth oscillator for transmitting an in-phase sine wave to the pair of third input terminals Is to a second detector capable of detecting the sine wave.

(Operation) According to the present invention having the above configuration, the first and fourth switches are turned on, the first input terminal voltage is changed by the variable resistor, and the first and second switches are changed. , A fourth and a sixth voltmeter to provide the first input terminal, the first
By measuring the voltage at the output terminal, the second input terminal, and the third output terminal, it can be confirmed that the first line and the switching device are correctly connected because the voltage changes are equal. Similarly, the second and fifth switches or the third and fifth switches are turned on, the first input terminal voltage is changed by the variable resistor, and the first, third, fifth and By measuring the voltages of the first input terminal, the second output terminal, the third input terminal and the third output terminal with the voltmeter of 6, the voltage change is equal and It can be confirmed that the switching device is properly connected.

Further, the first and fourth switches are turned on, the pulse wave generator generates a pulse wave having a constant pattern, and the first, third, and fifth pulse pattern detectors detect the pulse pattern. As a result, it can be confirmed that the first line and the switching device are correctly connected. Similarly, the second and fifth switches or the third and fifth switches are turned on, and the pulse wave generator generates a pulse wave having a constant pattern,
By detecting the pulse patterns by the fourth and fifth pulse pattern detectors, it can be confirmed that the second line and the switching device are correctly connected.

Further, the positions of the jumper wirings connected to the first, second and third input terminals are sent sine waves from the first, second, third and fourth oscillators, respectively. It can be confirmed by detecting with the detector of.

Further, the connection work is facilitated by collectively connecting the terminal plate terminals to the adapters, selecting the input / output terminals by the switch groups, and connecting to the switches.

As described above, according to the present invention, it is possible to confirm the connection, and it is possible to prevent a signal disconnection due to an incorrect connection or the like.

(Embodiment 1) FIG. 1 is a diagram showing a circuit configuration according to a first embodiment of the present invention. This figure shows only one direction of a so-called two-wire line in which upstream and downstream signals are superposed or a so-called four-line line in which upstream and downstream signals are independent. The left half of the figure is the sending end side, and the right half is the receiving end side. In the figure,
1 to 7 are switches, 8 and 9 are polarity reversing switches, 10 is a buffer amplifier having a high input impedance and an output impedance matching the lines A and B, 11 and 12 are terminating resistors, 13
Is a signal input terminal, 14 is a signal output terminal, 15 to 20 are terminals, 2
1,22 are lines A and B for transmitting electric signals, 23 is a variable resistor inserted between the two lines (but not necessarily a balanced type), 24
29 is a voltmeter for measuring the voltage between the two wires, and 30 to 33 are jumper wirings.

Next, the operation of switching from line A to line B will be described.

First, with the jumper wirings 32 and 33 not laid, all the switches are turned off and the terminals 15 to 20 are connected to the input / output of each switch (step 1).

The resistance value of the variable resistor 23 is slightly changed to change the line voltage of the terminal 15. Voltmeters 24,25,27,29 with terminals 15,16,1
Measure the line voltage of 8,20. It can be confirmed that the terminals 15, 16, 18, and 20 are correctly connected to the line A21 because the line voltage changes at the respective points are equal.

Further, as shown in FIG. 8, by detecting the difference between the line voltage of the terminal 15 and the line voltage of the terminal 16, it is possible to confirm whether the polarities of the terminals 15 and 16 are the same or inverted. Similarly, check whether the polarities are the same or inverted between terminals 18 and 20 (step 2).

If the switches 2 and 7 are turned on, it can be confirmed that the terminals 51, 17 and 19 are correctly connected by using the same procedure as in the first half of step 2 (step 3).

When the polarities between terminals 15 and 16 are reversed and when the polarities between terminals 18 and 20 are reversed, the polarities on the switch side are reversed by polarity reversing switches 8 and 9, The line A is prevented from being short-circuited by turning on (step 4).

Switch 1 is turned on and switch 2 is turned off on the sending side, switch 4 is turned on and switch 7 is turned off on the receiving side, and jumper wirings 30 and 31 are removed (step 5). turn on. The signal applied to the signal input terminal 13 is output to the signal output terminal 14 via the terminal 15, the polarity reversing switch 8, the switch 1, the terminal 16, the line A21, the terminal 18, the switch 4, the polarity reversing switch 9 and the terminal 20. Is output. Also, terminal 15, polarity reversing switch 8, buffer 10,
The same signal passing through the switch 2, the terminal 17, the line B22, the terminal 19 and the switch 7 is terminated by the terminating resistor 12.

At this time, the voltmeters 24 and 28 measure the line voltage between the terminals 15 and 19. It can be confirmed that the terminals 15 and 19 are properly connected because the line voltage at each point is equal (step 6).

Next, the switches 5 and 6 are turned on and the switches 4 and 7 are turned off to switch the receiving end from the line A to the line B.

At this time, the voltmeters 28 and 29 measure the line voltage between the terminals 19 and 20. It can be confirmed that the terminals 19 and 20 are correctly connected because the line voltage at each point is equal. If an error is detected when checking the connection, turn on switches 1 and 4,
It is possible to switch back from the line B to the line A immediately by turning off the other switches (step 7).

Next, the switch 3 is turned on and the switches 1 and 2 are turned off. At this time, the voltmeters 24 and 29 measure the line voltage between the terminals 15 and 20.
It can be confirmed that the terminals 15 and 20 are correctly connected because the line voltage at each point is equal. If an error is detected during the connection confirmation, switches 1 and 4 are turned on and the other switches are turned off to promptly connect the line B.
Can be switched back from (step 8).

In this state, the jumper wirings 32 and 33 are connected. At this time, turn off the switches 3 and 5, and use the voltmeters 24, 26, 28, 29 to connect the terminals 15, 17,
Measure the line voltage of 19,20. It can be confirmed that the jumper wirings 32 and 33 are correctly connected by the fact that the line voltage at each point is equal (step 9).

Finally, the connection of terminals 15, 16, 17, 18, 19, 20 and the input / output of each switch is removed (step 10).

As described above, in the present embodiment, it is possible to confirm the connection for each switching process, and it is possible to prevent signal disconnection due to erroneous connection or switch failure. Especially line A21 or line B
Even when 22 is accommodated in the relay transmission path and the positions of the sending end side and the receiving end side are separated, the connection on the sending and receiving end side can be confirmed through, so that there is an advantage that erroneous connection does not occur.

FIG. 2 is a diagram showing the first principle of connection confirmation in this embodiment. In the figure, 34 and 35 are input terminal pairs, 36 and 37 are output terminal pairs, 38 is a variable resistor, 39 is a voltmeter, and 40, 41, 42, 4
3 is a connection point. In FIG. 2, the resistance value of the variable resistor 38 inserted between the connection points 40 and 41 is gradually decreased from infinity to decrease the output on the sending end side, and on the receiving end side, the voltmeter 39 connects the connecting points 42, Measure the voltage across 43. It can be confirmed that the connection points 42 and 43 are connected to the connection points 40 and 41, respectively, because the voltage changes on the sending end side and the receiving end side are equal.

FIG. 3 is a diagram showing a second principle of connection confirmation in this embodiment. In this case, unlike the first principle, the line voltage is not intentionally changed. In the figure, 44 and 45 are output terminal pairs, 46 is a voltage type, and 47 and 48 are connection points.

In FIG. 3, connection points 42,
The line voltage between 43 and 49, 50 is measured for a while, and it can be confirmed that the connection points 42, 49 and 43, 50 are connected to the connection points 47 and 48, respectively, when the measured values are equal. .

FIG. 4A shows a circuit configuration example of the switch group of the present invention. In the first embodiment, it is used at the positions of the terminals 15 to 20. Correspondence in the case of the terminal 15 is as shown in FIG. By operating the contacts of the switch, it is possible to connect to any terminal through an adapter that can be connected to all or a part of the terminals on the terminal board at once. The circuit configuration is not limited to that shown in FIG. This allows automatic connection to the terminal strip terminals.

(Embodiment 2) FIG. 5 shows a circuit configuration according to a second embodiment of the present invention.
In the figure, 51 is a pulse wave generator, and 52 to 56 are pulse pattern detectors.

The operation of the second embodiment is almost the same as that of the first embodiment except that the pulse generator 51 sends a pulse wave of a certain pattern at the time of confirming each connection, and the pattern detector emits the pulse wave.

When the signal applied to the signal input terminal 13 has a large voltage change like an audio signal, it may not function normally in the first embodiment, but in the second embodiment, the connection confirmation can be performed.

FIG. 6 is a diagram showing the principle of connection confirmation in this embodiment. In the figure, 57 is a pulse wave generator, 58 is a pulse pattern detector, and 59 to 62 are connection points.

In FIG. 6, a pulse wave having a predetermined pattern is transmitted from the pulse wave generator 57 inserted between the connection points 59 and 60 on the receiving end side, and the pattern wave is detected on the receiving end side by the pulse pattern detection 58. By detecting the pattern by 58, it can be confirmed that the connection points 61 and 62 are connected to the connection points 59 and 60, respectively.

(Embodiment 3) FIG. 7 is a diagram showing a circuit configuration according to a third embodiment of this embodiment. In the figure, 63 to 66 are terminals 16 to 19 respectively.
, A sine wave oscillator that sends out a pair of in-phase sine waves at the out-of-band frequency of the line A21 and line B22, 67 to 70 sine wave detectors, and 71 to 78 ground.

In the third embodiment, when the jumper wirings 30 and 31 are removed in the first and second embodiments, a sine wave having an amplitude that does not affect communication is intermittently sent from the sine wave generators 63 and 65 to generate a sine wave. By detecting it with the wave detectors 67 and 69, the positions of the jumper wirings 30 and 31 to be removed can be confirmed. Similarly, when connecting the jumper wirings 32 and 33 in the first and second embodiments, the sine wave generator 6
The position of the jumper wiring 32, 33 to be connected is confirmed by intermittently sending out a sine wave with an amplitude that does not affect communication from 4, 66 and detecting it with the sine wave generators 68, 70. it can. Thus, in this embodiment, by incorporating the oscillator in the switching circuit, the jumper wiring 30, 31, 32, 33 terminals 16,
There is no need to check the position on the 17,18,19 side again, and the jumper wiring can be removed and connected reliably.

(Effects of the Invention) As described above, according to the present invention, it is possible to confirm the connection in each line switching process, and to prevent signal disconnection due to erroneous connection or switch failure.

[Brief description of drawings]

1 is a block diagram of the first embodiment of the present invention, FIG. 2 is a first principle diagram of the first embodiment, FIG. 3 is a second principle diagram of the first embodiment, and FIG. FIG. 4A is a circuit configuration diagram of a switch group of the present invention, FIG. 4B is a diagram showing an example of use of the switch group of the present invention, FIG. 5 is a configuration diagram of a second embodiment of the present invention, FIG. 6 is a principle diagram of the second embodiment, FIG. 7 is a configuration diagram of a third embodiment of the present invention, and FIG. 8 is a principle diagram for detecting polarity reversal of two terminals connected by jumper wiring. FIG. 9 is an explanatory diagram of line switching. 1 to 7 ... switch, 8, 9 ... polarity reversing switch, 10 ... buffer amplifier, 11, 12 ... termination resistor, 13 ... signal input terminal, 14 ... signal output terminal, 15 to 20 ... Terminal, 21 …… Line A, 22 …… Line B, 23,38 …… Variable resistor, 24 ～ 29,39,46 …… Voltmeter, 30 ～ 33 …… Jumper wiring 34,35 …… Input terminal pair , 36,37,44,45 …… Output terminal pair, 40 to 43,47 to 50,59 to 62 …… Connection point, 51,57 …… Pulse wave generator, 52 to 56,58 …… Pulse pattern detection 63-66 ... Sine wave oscillator, 67-70 ... Sine wave detector, 71-78 ... Ground.

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Yoshifumi Tamura 1-1-6 Uchisaiwai-cho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation (72) Hideaki Hanaoka 1-1-6 Uchisai-cho, Chiyoda-ku, Tokyo Japan Nippon Telegraph and Telephone Corporation (72) Inventor Yuji Kato 1-6, Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation (72) Inventor Hidehiko Sato 1-6, Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Inventor Koichi Hosoya 1-6, Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation (72) Inventor Junichi Hayakawa 1-1-6, Uchisaiwaicho, Chiyoda-ku, Tokyo No. Japan Telegraph and Telephone Corporation

Claims (3)

[Claims] 1. On the sending end side and the receiving end side, the first line in use, which is transmitting electric signals, is switched to the second line in free state, which is not transmitting electric signals, In a line switching device that puts a first line in an idle state and a second line in an active state, a transmission end side uses a first input terminal for inputting an electric signal and a first input terminal for inputting an electric signal.
A first output terminal for outputting to the line, a second output terminal for outputting an electric signal to the second line, and a first output terminal inserted between the first input terminal and the first output terminal. 1 switch, second and third switches inserted between the first input terminal and the second output terminal, and all on the terminal plate to which the first input terminal is connected Alternatively, a first adapter that can be collectively connected to some of the terminals, a second adapter that can be collectively connected to all or some of the terminals on the terminal board to which the first line is connected, and the second adapter A third adapter that can be collectively connected to all or some of the terminals on the terminal board to which the line is connected, and a first adapter that is inserted between the first adapter and the first input terminal. Switch group, and second switch group inserted between the second adapter and the first output terminal , A third switch group inserted between the third adapter and the second output terminal, a variable resistor connected to the first input terminal, and a variable resistor connected to the first input terminal A first voltmeter connected to the first output terminal, a second voltmeter connected to the first output terminal, and a third voltmeter connected to the second output terminal. A second input terminal for inputting an electric signal from the first line, a third input terminal for inputting an electric signal from the second line, and a third output signal for outputting an electric signal; Second
A fourth switch inserted between the third input terminal and the third output terminal, a fifth switch inserted between the third input terminal and the third output terminal, and the first switch 4th adapter that can be collectively connected to all or part of the terminal board to which the line is connected, and can be collectively connected to all or part of the terminals on the terminal board to which the second line is connected A fifth adapter, a sixth adapter that can be collectively connected to all or some of the terminals on the terminal plate to which the third output terminal is connected, the fourth adapter, and the second input A fourth switch group inserted between the terminals, a fifth switch group inserted between the fifth adapter and the third output terminal, the sixth adapter and the third A sixth switch group inserted between the second input terminal and the sixth switch group, A voltage meter, said third and fifth voltmeter connected to the input terminal, line switching apparatus characterized by having a sixth voltage meter which is connected to the third input terminal. 2. On the sending end side and the receiving end side, the first line in use, which is transmitting electric signals, is switched to the second line in free state, which is not transmitting electric signals, In a line switching device that puts a first line in an idle state and a second line in an active state, a transmission end side uses a first input terminal for inputting an electric signal and a first input terminal for inputting an electric signal.
A first output terminal for outputting to the line, a second output terminal for outputting an electric signal to the second line, and a first output terminal inserted between the first input terminal and the first output terminal. 1 switch, second and third switches inserted between the first input terminal and the second output terminal, and all on the terminal plate to which the first input terminal is connected Alternatively, a first adapter that can be collectively connected to some of the terminals, a second adapter that can be collectively connected to all or some of the terminals on the terminal board to which the first line is connected, and the second adapter A third adapter that can be collectively connected to all or some of the terminals on the terminal board to which the line is connected, and a first adapter that is inserted between the first adapter and the first input terminal. Switch group, and second switch group inserted between the second adapter and the first output terminal A third switch group inserted between the third adapter and the second output terminal, a pulse wave generator connected to the first input terminal, and a first output terminal A first pulse pattern detector connected to the second output terminal; and a second pulse pattern detector connected to the second output terminal, wherein the receiving end side receives the electric signal from the first line. Two input terminals, a third input terminal for inputting an electric signal from the second line, a third output signal for outputting an electric signal, and the second
A fourth switch inserted between the third input terminal and the third output terminal, a fifth switch inserted between the third input terminal and the third output terminal, and the first switch. 4th adapter that can be collectively connected to all or a part of the terminal board to which the line is connected, and can be collectively connected to all or a part of the terminals on the terminal board to which the second line is connected A fifth adapter, a sixth adapter that can be collectively connected to all or some of the terminals on the terminal plate to which the third output terminal is connected, the fourth adapter, and the second input A fourth switch group inserted between the terminal, a fifth switch group inserted between the fifth adapter and the third output terminal, the sixth adapter and the third A sixth switch group inserted between the second input terminal and the sixth switch group, Pulse pattern detector, a fourth pulse pattern detector connected to the third input terminal, and a fifth pulse pattern detector connected to the third output terminal. Line switching device. 3. On the sending end side and the receiving end side, the first line in use, which is transmitting electric signals, is switched to the second line in free state, which is not transmitting electric signals, In a line switching device that puts a first line in an idle state and a second line in an active state, a transmission end side uses a first input terminal for inputting an electric signal and a first input terminal for inputting an electric signal.
A first output terminal for outputting to the line, a second output terminal for outputting an electric signal to the second line, and a first output terminal inserted between the first input terminal and the first output terminal. 1 switch, second and third switches inserted between the first input terminal and the second output terminal, and all on the terminal plate to which the first input terminal is connected Alternatively, a first adapter that can be collectively connected to some of the terminals, a second adapter that can be collectively connected to all or some of the terminals on the terminal board to which the first line is connected, and the second adapter A third adapter that can be collectively connected to all or some of the terminals on the terminal board to which the line is connected, and a first adapter that is inserted between the first adapter and the first input terminal. Switch group, and second switch group inserted between the second adapter and the first output terminal A third switch group inserted between the third adapter and the second output terminal, a first oscillator for sending an in-phase sine wave to the pair of first output terminals, It has a second oscillator for sending out a sine wave of the same phase to a pair of two output terminals, and a first detector capable of detecting the sine wave, and the receiving end side receives the electric signal from the first line. A second input terminal for inputting, a third input terminal for inputting an electric signal from the second line, a third output signal for outputting an electric signal, and the second
A fourth switch inserted between the third input terminal and the third output terminal, a fifth switch inserted between the third input terminal and the third output terminal, and the first switch. 4th adapter that can be collectively connected to all or a part of the terminal board to which the line is connected, and can be collectively connected to all or a part of the terminals on the terminal board to which the second line is connected A fifth adapter, a sixth adapter capable of being collectively connected to all or some of the terminals on the terminal plate to which the third output terminal is connected, the fourth adapter and the second input A fourth switch group inserted between the terminals, a fifth switch group inserted between the fifth adapter and the third output terminal, the sixth adapter and the third A sixth switch group that is inserted between the second input terminal pair and a sixth switch group that is inserted between the second input terminal pair. A third oscillator for transmitting a wave, a fourth oscillator for transmitting an in-phase sine wave to the pair of third input terminals, and a second detector capable of detecting the sine wave. Line switching device.