JPS62183629A - Line switching device - Google Patents

Abstract

PURPOSE:To restore the state just before power interruption for both a controller and a switching device by providing a latching relay operated the same as a line changeover switch in parallel with the switch and sending the on/off information of the relay contact to the controller as switching information. CONSTITUTION:Latching relays 71-7n operated the same as latching relays 41-4n constituting the line changeover switch are provided in parallel with the relays 41-4n, the line switching state is stored by the on/off of contacts S1-Sn of the relays 71-7n, and the stored information is sent to the controller. In inputting a signal switching the 1st active line usage into the n-th standby line usage, for example, and causing a current to be conducted through a winding 51 of the relay 41 and a winding 6n of the relay 4n, the current is conducted through the winding line 81 of the relay 71 and the winding 9n of the relay 7n also, the contact A1 turned off, the contact Sn is turned on, a light emitting diode L1 is not lighted, the diode Ln is lighted, and an H level signal form an output 1 and an L level signal from an output (n) are sent to the controller, which stores the line switching state in a RAM.

Description

[Detailed Description of the Invention] [Summary] In a line switching device, a latching relay that operates in the same way as a line changeover switch is provided in parallel with the line changeover switch to memorize the line switching state, and this latching By transmitting on/off information of the relay contacts to the control device as switching information, both the control device and the switching device can restore and store the state immediately before the power was cut off when the power is turned off and restored.

[Industrial application field]

The present invention relates to improvements in line switching devices used in communication lines and the like.

The line switching device has a switching device that receives a line switching signal from a control device, switches the line using a line changeover switch, and sends switching information back to the control device, and the control device and the switching device store the state of the line. In a device, it is desirable that both the control device and the switching device be able to restore and store the state immediately before the power was cut off when the power is restored.

[Conventional technology]

FIG. 2 is a block diagram of a conventional line switching device.

In the figure, 200 is a control device, 201 is a switching device, 100
is an interface section, 101.11 to 1n are not circuits, 102 and 105 are memory control sections, and 103.104 is R.
AM, 21-2n, 31-3n are AND circuits, 41-4
n is a latching relay (line changeover switch) corresponding to each line, 51 to 5n are latching relays 41 to 4n
61 to 6n indicate windings through which current flows in response to switching commands of the latching relays 41 to 4n.

Below, the lower number is used as the working line, for example, the nth number is used as the protection line, and the latching relay 41 is normal when each line is in common use.
An example will be explained in which the use of the first working line is switched to the use of the n@th protection line.

The control device 200 sends to the switching device 201 a signal for switching the use of the first working line to the use of the nth protection line, and also outputs a strobe signal.

In response to this, the interface section 100 outputs a 0-level signal for switching from terminal 1, and a level signal for switching from terminal n (the phases of the active and switching-back are reversed for the standby).

These signals are sent to the AND circuit 31 via the AND circuit 21 and the NOT circuit 11, and to the AND circuit 3n via the AND circuit 2n and the NOT circuit 1n, and are sent to the latching relay 41 while the strobe signal is input. winding 51
Current flows through the winding 6n of the latching relay 4n, the contact of the latching relay 41 (not shown) is turned off, and the contact of the latching relay 4n (not shown) is turned off.
is turned on, and the use of the first working line is switched to the use of the nth protection line.

At this time, the signals from the AND circuits 21, 31.2n, and 3n are sent to the memory control unit 102, and the state of the line changeover switch that has changed the use of the first working line to the use of the nth protection line (the state of the contacts of the latching relay) is sent to the memory control unit 102. ) to RAM103
and output 1. Control device 20 as output n
0 and also stored in the RAM 104 via the memory control unit 105.

In this way, the line is switched and the state of the line changeover switch (the state of the latching relay contacts) is changed to RA.
It is stored in M103 and 104.

Here, if the switching device 201 is powered off and the RA
Even if the contents of M103 are cleared, when the power is restored, the control '4
If the B device 200 sends the contents stored in the RAM 104 to the switching device 201, it will be stored in the RAM of the switching device 201.
103 can restore and store the state immediately before the power was turned off, and even if the power of the control device 200 is turned off and the storage contents of the RAM 104 are cleared, the memory control unit 105 can restore the state of the switching device 2.
By downloading the contents stored in the RAM 103 of 01 via the memory control unit 102, the state immediately before the power was cut off can be restored and stored.

[Problem that the invention seeks to solve]

However, the control device 200 and the switching device 201
If the power to both is cut off, the line changeover switch remains the same, but the memory contents of RAM 103 and 104 are both cleared, so the current status becomes unknown, causing inconvenience for maintenance, and the problem of not being able to handle the next line switching. There is a point.

[Means for solving problems]

The above-mentioned problem is as shown in FIG.
The line switching device of the present invention stores the line switching state by turning on and off the contacts 81 to 4n of the latching relay, and transmits the stored information to the control device as switching information. resolved.

[Effect]

According to the present invention, since the line switching state is memorized by the on/off status of the contacts S1 to Sn of the latching relays 71 to 7n, it is not cleared even if the switching device is powered off, so both the switching device and the control device When the power is turned off and restored, the control device can download this content and store it in the memory, allowing it to restore and store the state immediately before the power was turned off.
This eliminates the problem of inconvenience in maintenance and inability to deal with the next line switching.

〔Example〕

FIG. 1 is a block diagram of a switching device according to an embodiment of the present invention.

In the figure, 71-7n are memory latching relays, 81-8n
91 to 9n are windings through which current flows in response to switching commands of latching relays 1 to 7n, respectively; 91 to 9n are windings in which current flows in response to switching commands to latching relays 71 to 7n, respectively;
81 to Sn are contacts of latching relays 71 to 7n, respectively;
R1-Rn are pull-up resistors, L1-Ln are light-emitting diodes, B1-Bn are buffers for the light-emitting diodes L1-Ln, and ■ is a power supply voltage, and the same reference numerals indicate the same functions throughout the drawings.

In the case of the embodiment of the present invention, the difference from the switching device of FIG. 2 is that a latching relay 71 is used instead of the RAM 103.
~7n contacts 5L-3n are memorized using on/off,
Another point is that the on/off states of the contacts 81 to Sn of this latching relay are output to the control device.

For example, when a signal is input to switch the use of the first working line to the use of the nth protection line and current flows through the winding 51 of the latching relay 41 and the winding 6n of the latching relay 4n, the winding 81 of the latching relay 71 and the winding 6n of the latching relay 71 and the latching relay A current also flows through the winding wire 9n of 7n, the contact S1 is turned off and the contact Sn is turned on, and it is stored that the first working line is not used and the nth protection line is now used.

In this case, the light emitting diode L1 does not emit light, and the light emitting diode Ln emits light, and a signal of H level from output 1 and L level from output n is sent to the control device, and the control device 20 shown in FIG.
0, the line switching state is stored in the RAM 104 via the memory control unit 105.

Therefore, even if the power to both the control device and the switching device is cut off, the latching relays 71 to 7n for storing the line state
Since the state of the control TLL device 200 does not change, the control TLL device 200 can restore and store the state immediately before the power is turned off by sucking up the switching state from the outputs 1 to n of the switching device and storing it in the RAM 104. You will no longer be unable to deal with line switching.

〔Effect of the invention〕

As explained in detail above, according to the present invention, even if the power of both the control device and the switching device is cut off, the state of the latching relay for storing the line state remains unchanged, so the control device can switch By siphoning the switching state from output 1 to output n of the device and storing it in RAM, the state immediately before the power was turned off can be restored and stored, which has the effect of eliminating inconveniences in maintenance and inability to cope with the next line switching. .

[Brief explanation of drawings]

FIG. 1 is a block diagram of a switching device according to an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional line switching device. In the figure, 200 is a control device, 201 is a switching device, 100 is an interface section, 101.11-1n is a knot circuit, 102.105 is a memory control section, 103.104 is RA, M, 21-2n, 31-3n is an AND circuit, 41-4n, 7
1~7n are latching relays, 51~5n, 61~6n
, 81-8n, 91-9n are the windings of the latching relay, 3l-3n are the contacts of the latching relay, R1-Rn, respectively.
is a pull-up resistor, L1 to Ln are light emitting diodes, B1 to Bn are buffers, and (2) is a power supply voltage. Akira Kitani 0-well example switching liquid chamber” Bu■・Tsuku trouble 1st

Claims (1)

[Scope of Claims] A switching device that receives a line switching signal from a control device, switches the line using a line changeover switch (41 to 4n), and sends switching information back to the control device; In a line switching device that should store the state of the line, the switching device includes a line changeover switch (41 to 4n).
By providing a latching relay (71 to 7n) that operates in the same way as the line changeover switch (41 to 4n) in parallel, the line switching state can be stored, and the on/off information of the contacts (S1 to Sn) of this latching relay can be stored. A line switching device characterized in that switching information is transmitted to the control device.