JPH0213869B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a data transmission path monitoring and switching device, and more particularly to a device for switching and monitoring a data transmission path having a protection line between a regular line and a protection line.

BACKGROUND OF THE INVENTION With the advancement of the information society, dedicated lines for data transmission are being widely used in online banking systems and other applications, and as a result, demands for high reliability of dedicated lines are increasing. Duplicating the subscriber's private line is considered to be effective in improving reliability, but in order to achieve this, the transmission line switching device inserted at the terminal side must (1) be small, inexpensive, and easy to maintain; , (2) It is possible to supply power from the station side, and (3) It is possible to perform switching control from the station side using the subscriber line.

However, it has been difficult to satisfy these requirements using conventional transmission line switching technology.

OBJECTS OF THE INVENTION Therefore, an object of the present invention is to provide a data transmission line monitoring and switching device that satisfies all of the above-mentioned conditions for a transmission line switching device and is also capable of testing and monitoring failed lines. .

Composition of the Invention In order to achieve the above object, a monitoring switching device according to the present invention provides a data transmission line in which a regular line and a protection line are provided between a station side device and a terminal side device.
A polarized self-holding terminal line switching relay is connected to the protection line in the terminal equipment, an operating coil with a parallel diode is connected to the relay through its own normally closed contact, and a jumper is connected to the regular line. A release coil with a parallel diode connected via the normally open contact of the reset relay to be described, and a contact for selectively connecting the terminal side line terminal to the regular line and the protection line are provided.

Here, a polarized self-holding relay has an operating coil that responds only to an operating voltage or current of a predetermined polarity, and the state of the contact activated by the operating coil is maintained until the release coil is activated. type of relay. The regular line is used in preference to the backup line unless there is an accident.

The terminal-side device is further provided with a return relay with a parallel diode connected to the service line via the normally open contact of the terminal-side line switching relay.

In the station-side device, the DC power source is selectively connected to the regular line and the protection line via a power supply polarity switching relay and a power supply connection switching relay. The station-side device further includes a station-side line switching relay that selectively connects the station-side line terminal to the regular line and the protection line, and detects the current/voltage polarity applied to the regular line and the protection line from the direct power supply. Provide means to do so.

When the regular line fails, the voltage polarity of the protection line is switched by manually energizing the power supply polarity switching relay.The operating coil of the terminal side line switching relay is energized to switch the terminal side line terminal to the protection line, and the voltage polarity is switched. The station side line switching relay is energized by the output of the detecting means corresponding to the above, and the station side line terminal is switched to the protection line, and operation is performed with switching between the regular line and the protection line. Further, the power supply connection switching relay is energized to connect the DC power source to the service line, and the current and voltage polarity of the service line is monitored by the detecting means.

When the regular line is restored, the detecting means detects changes in the current and voltage polarity of the regular line due to the recovery. In response to the detection of the recovery, the output of the detecting means de-energizes the station side line switching relay, switches the station side line terminal to the service line, switches the voltage polarity of the service line by the power supply polarity switching relay, and returns the relay. and energizes the release coil of the terminal-side line switching relay, switches the terminal-side line terminal to the regular line, and automatically returns the operation of the transmission line from the backup line to the regular line.

In the case of a data transmission line that has two regular lines, that is, a first regular line, a second regular line, and a protection line, between the terminal side equipment and the station side equipment, the protection line in the terminal side equipment has polarity. Connect the self-holding type first terminal side line switching relay. The relay has an operating coil with a parallel diode connected to the protection line via its own normally closed contact, and a working coil with a parallel diode connected to the first service line via a jumper and a normally open contact of a first return relay described below. A release coil with a parallel diode and a contact point for selectively connecting the first line terminal on the terminal side to the first regular line and the protection line are provided.

The protection line in the terminal side device is further connected to an operating coil with a parallel diode connected via its own normally closed contact, and the second normal line is connected via a jumper and a normally open contact of a second return relay to be described below. A release coil with a parallel diode connected to the
A polarized self-holding type second terminal line switching relay having contacts for selectively connecting the line terminal to the second regular line and the protection line is provided. Furthermore, a first return relay with a parallel diode is connected to the first regular line in the terminal side equipment via the normally open contact of the first terminal side line switching relay, and a second regular line in the terminal side equipment is connected to the first return relay with a parallel diode. A second return relay with a parallel diode is connected via the normally open contact of the terminal side line switching relay.

The station side equipment includes a DC power supply and the first and second
A power polarity switching relay and a power supply connection switching relay connected between the regular line and the protection line; the first and second line terminals on the station side in the station equipment to the first and second regular lines and the protection line, respectively. A station-side line switching relay that is selectively connected; and means for detecting the polarity of current and voltage selectively applied from the direct power source to the first and second regular lines and the protection line are provided.

In the event of a failure in any of the regular lines, a predetermined voltage polarity switch is applied to the protection line by manually energizing the power supply polarity switching relay, and the operating coil of the line switching relay on the terminal side of the line is energized to switch the circuit. Switch the terminal side line terminal to the backup line. The output of the detecting means accompanying the voltage polarity switching energizes the station side line switching relay to switch the station side line terminal of the line to the protection line, and energizes the power supply connection switching relay to switch on the DC power source. Connect to the regular line,
The power supply/voltage polarity is monitored by the means described above.

When the above-mentioned service line recovers from an accident, the detecting means detects the change in DC current/voltage polarity accompanying the recovery and generates an output, which de-energizes the line switching relay on the station side. Return the line terminal on the station side to the regular line, energize the power supply polarity switching relay, switch the voltage polarity of the line, energize the return relay of the line and the release coil of the terminal line switching relay, and then Return the side line terminal to the regular line.

Embodiment The transmission line of the embodiment shown in FIG. 1 has a regular line N and a protection line E between the station side device and the terminal side device.

In the terminal side device, the operating coil A of the polar self-holding type terminal side line switching relay 1 is connected between the lines L3 and L4 of the protection line E via its own normally closed contact r1, and the diode D is connected to this relay. Connect in parallel to the working coil. The operating coil A of the return relay 2 is connected between the lines L1 and L2 of the regular line N via the normally open contact r1 of the terminal side line switching relay 1, and the diode D is connected in parallel to the operating coil A. The release coil RE of the terminal side line switching relay 1 is connected between the lines L1 and L2 of the service line N via the normally open contact r2 of the return relay 2 and jumper J, and the diode D is connected in parallel to the release coil RE. Ru. The terminal side line terminal DT of the transmission line is the terminal side line switching relay 1.
Through the normally open contact r1, it is normally connected to the regular line N, and when the terminal side line switching relay 1 is activated, it is switched and connected to the protection line E.

The station side device is provided with a DC power supply 3, a power supply polarity switching relay 4, a station side line switching relay 5, a power supply connection switching relay 6, and a selection circuit 7. Selection circuit 7
selects the connection between the station side line terminal ST and the regular line N or the protection line E, and selectively applies the voltage of the DC power supply 3 to the regular line N and the protection line E.
The illustrated selection circuit 7 includes a common line loop current detection means 81, a common line voltage polarity detection means 82,
It includes a protection line voltage polarity detection means 83, monostable circuits MS1, MS2, an OR circuit, a flip-flop FF, etc.

The operation of the apparatus shown in FIG. 1 will be explained with reference to the time chart shown in FIG. The shaded portion in FIG. 2 indicates a state in which the line N or E of the data transmission path is capable of data transmission. When a failure occurs in the current regular line N at time to, the station side manually applies a switching signal FA to the power supply polarity switching relay 4, for example.
Due to the operation of contact r4 of power supply polarity switching relay 4,
A positive voltage is applied to the line L3 from the DC power supply 3, a negative voltage is applied to the line L4, and a voltage in the opposite direction of the diode D is applied to the terminal side line switching relay 1.

Therefore, the terminal side line switching relay 1 is energized,
The terminal side line terminal DT is switched from the regular line N to the protection line E by the switching relay contact r1. At the same time, the terminal side line switching relay 1 itself is separated from the protection line E by opening its own normally closed contact r1. At this time, on the station side, the voltage polarity detection means 83 of the protection line detects a change in the voltage polarity of the protection line,
The output energizes the station side line switching relay 5 via the monostable circuit MS1 and flip-flop FF. Contact r5 of the station line switching relay 5 connects the station side line terminal ST to the protection line E at time _t1 , and data transmission is resumed via the protection line E as shown by diagonal lines in FIG.

Simultaneously with the parallelization of the protection lines E on the station side, the power supply connection switching relay 6 is energized by the contact r5 of the station side line switching relay 5, and the DC power supply 3 is connected to the regular line N through the contact r6. In addition, the current detection means 81 and the voltage polarity detection means 8 of the common line loop
2 starts monitoring the regular line N.

When the fault is removed from the service line N at time t ₂ , a loop is formed in the service line N via the diode D connected in parallel to the recovery relay 2 . Therefore, the current detection means 8 of this loop provided in the station side device
1 detects the looping of the regular line N and energizes the power supply polarity switching relay 4, so that a positive voltage is applied to the line L1 of the regular line N from the DC power supply 3 through the contact r4, and a negative voltage is applied to the line L2. Added.

Therefore, on the terminal side, the return relay 2 is energized, and the release coil RE of the terminal side line switching relay 1 is energized.
is energized, and the terminal side line terminal DT is switched from the protection line E to the regular line N. At the same time, the voltage polarity detection means 82 of the regular line detects the change in voltage polarity when the loop is closed, and its output deenergizes the station side line switching relay 5 via the monostable circuit MS2 and flip-flop FF. Therefore, the station side line terminal ST is switched from the protection line E to the regular line N by the relay contact r5, and data transmission via the regular line N is restored at time _t3 .

At the same time as the parallelization of the above-mentioned regular lines N, the power supply connection switching relay 6 is switched to the station side line switching relay 5
At the same time, the power is turned off, and the DC power source 3 is connected to the backup line E through the contact r6. This completes the operating cycle.

Figure 3 shows two regular lines, namely the first regular line N1.
An embodiment of the present invention is shown for a transmission line having a second regular line N2 and a protection line E common to them. One end of a first terminal-side line switching relay 11 of a polar self-holding type similar to the terminal-side line switching relay 1 of the embodiment shown in FIG. and similar second
One end of the terminal side line switching relay 12 is connected to the other line L6 of the backup line E via its own normally closed contact r12, and the other ends of both terminal side line switching relays 11 and 12 are directly connected, and both terminal side lines switching relay 11,
Diodes D connected in parallel to 12 working coils A are connected so that they have opposite polarities.

A first return relay 21 similar to the return relay of the embodiment in FIG. 1 is connected to the first regular line N1 via a normally open contact r11 of the first terminal side line switching relay 11. A similar second return relay 22 is connected to the second regular line N2 via the normally open contact r12 of the second terminal side line switching relay 12. Double return relay 21,
Independent diodes D are connected in parallel to each of the 22 operating coils A. The release coil RE of the first terminal side line switching relay 11 is connected to one of the regular lines N1 via the normally open contact r21 of the first return relay 21 and the jumper J. The release coil RE of the second terminal side line switching relay 12 is connected to the other regular line N2 via the normally open contact r22 of the second return relay 22 and the jumper J.

The terminal-side first line terminal DR is selectively connected to the first regular line N1 and the protection line E via a contact r11 of the first terminal-side line switching relay 11. The terminal-side second line terminal DS is selectively connected to the regular line N2 and the protection line E via the contact r12 of the second terminal-side line switching relay 12.

The station side circuit in Figure 1 is appropriately modified for the transmission line with the configuration shown in Figure 3, and the protection line E in Figure 3 is remotely switched from the station side, and the regular line N1 or the regular line N1 or It is clear to those skilled in the art that an automatic return to N2 can be implemented. In this case, if the time delay caused by the station side circuit is ignored, the operation time chart of the circuit of FIG. 3 becomes as shown in FIG. 4.

Effects of the Invention The effects achieved by the data transmission line monitoring and switching device according to the present invention described above are listed below.

(b) Switching can be performed without installing a power supply section on the terminal side or using another control line.

(b) Switching between the protection line and the regular line of the data transmission line is performed from the station side, and there is no need for engineers to go to the terminal side for this switching, so labor savings can be expected.

(c) In addition, switching to a backup line in the event of a failure is performed quickly, improving the service level.

(d) It is also possible to monitor the regular line in the event of a failure and automatically restore the regular line.

(e) Since the number of parts is small and the configuration is simple, low-cost mass production is possible.

(f) It is easy to downsize and can be incorporated into protective devices and other accessory devices as necessary.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of one embodiment of the present invention, FIG. 2 is a plan view explaining its operation, and FIGS. 3 and 4 are illustrations of other embodiments. 1...Terminal side line switching relay, 2...Return relay, 3...DC power supply, 4...Power polarity switching relay, 5...Station side line switching relay, 6...Power connection switching relay, 7...Selection Circuit, 11... First terminal side line switching relay, 12... Second terminal side line switching relay, 21... First return relay, 22... Second
Return relay, 81... Current detection means for the regular line loop, 82... Voltage polarity detection means for the regular line, 8
3... Voltage polarity detection means for the protection line, A... Operating coil, D... Diode, DT... Line terminal on the terminal side, DR... First line terminal on the terminal side, DS... Second line terminal on the terminal side, E...protection line, J...jumper, N...regular line, N1...first regular line, N
2...2nd regular line, RE...release coil, ST...
...Office side line terminal.

Claims (1)

[Claims] 1. In a data transmission line in which a regular line and a protection line are provided between a terminal side device and a station side device, a data transmission line that is connected to the protection line in the terminal side device via its own normally closed contact. an operating coil with a parallel diode, a release coil with a parallel diode connected to the service line via a jumper and a normally open contact of a return relay, and a contact for selectively connecting the terminal side line terminal to the service line and the protection line. A polarized self-holding type terminal line switching relay with a parallel diode; A power supply polarity switching relay and a power supply connection switching relay connected between the regular line and the protection line; a station line switching relay that selectively connects the station line terminal in the station equipment to the regular line and the protection line. and a means provided in the station-side device for detecting the polarity of the current and voltage applied from the DC power source to the regular line and the protection line, and in the event of a failure of the service line, the protection line is switched on via the power supply polarity switching relay. Switching the terminal side line terminal to the protection line by energizing the operating coil of the line switching relay on the terminal side by switching the voltage polarity, and energizing the line switching relay on the station side by the output of the detecting means in response to the voltage polarity switching, and energizing the operating coil of the line switching relay on the terminal side. Switch the line terminal to the protection line, energize the connection switching relay, connect the DC power supply to the service line, monitor the service line using the detection means, and when the service line is restored, detect a change in current/voltage polarity at the time of recovery. The output of the detecting means corresponding to the above de-energizes the station-side line switching relay to return the station-side line terminal to the service line, and energizes the power supply polarity switching relay to switch the voltage polarity of the service line and restore the relay. and a data transmission line monitoring and switching device which returns the terminal side line terminal to the regular line by energizing the release coil of the terminal side line switching relay. 2 Between the terminal side device and the station side device, the first and second
In a data transmission line that has a regular line and a backup line, an operating coil with a parallel diode is connected to the backup line in the terminal side device via its own normally closed contact, a jumper and a first return relay are connected to the first regular line. a polarized self-holding type first terminal having a release coil with a parallel diode connected to the normally open contact of the terminal, and a contact for selectively connecting the first line terminal on the terminal side to the first regular line and the protection line; Side line switching relay;
A second operating coil with a parallel diode connected to the backup line in the terminal side device via its own normally closed contact.
It has a release coil with a parallel diode connected to the service line via a jumper and a normally open contact of the second return relay, and a contact for selectively connecting the terminal side second line terminal to the second service line and the protection line. A polarized self-holding type second terminal side line switching relay; a first return relay with a parallel diode connected to the first regular line in the terminal side device via a normally open contact of the first terminal side line switching relay; a terminal; A second return relay with a parallel diode connected to the second regular line in the side equipment via the normally open contact of the second terminal side line switching relay; a DC power supply and the first and second regular lines in the station equipment; and a power supply polarity switching relay and a power supply connection switching relay connected between the terminal and the backup line;
A station-side line switching relay that selectively connects to the regular line and the protection line; and a station-side line switching relay provided in the station equipment to detect the polarity of the current and voltage applied from the DC power source to the first and second regular lines and the protection line. In the event of a failure in any of the service lines, the power supply polarity switching relay is energized to apply a predetermined voltage polarity switch to the protection line, thereby energizing the operating coil of the line switching relay on the terminal side of the line. As a result, the terminal side terminal of the line is switched to the protection line, and the output of the detecting means responsive to the voltage polarity switching energizes the station side line switching relay of the line, thereby switching the station side terminal of the line to the protection line. and energizes the power supply connection switching relay to connect a DC power source to the line, the current and voltage polarity of the line is monitored by the means for detecting, and when the normal line is restored, the current and voltage at the time of recovery are monitored. Due to the output of the detecting means accompanying the polarity change,
The station-side line switching relay of the line is deenergized to return the station-side line terminal to the regular line, and the power supply polarity switching relay is energized to switch the voltage polarity of the line, thereby restoring the relay and terminal of the line. A data transmission line monitoring and switching device that returns the terminal side line terminal of the line to the regular line by energizing the release coil of the side line switching relay.