JPS59191944A - Monitor switching device of data transmission line - Google Patents

Abstract

PURPOSE:To perform switching between a using circuit and a spare circuit of a data transmission line from the side of a station and to secure the automatic resetting to the using circuit, by providing a reset relay to each using circuit. CONSTITUTION:When a using circuit N has a fault, the switching signal is applied manually to a relay 4 at the station side. Thus a switching relay 1 is energized by a contact r4 to switch the faulty using circuit to a spare circuit E. At the same time, the data transmission is restarted via the circuit E. While loop detection means 81 and 82 monitor the circuit Nat the station side. When the fault of the circuit N is recovered, a loop is formed to the circuit N. Then the means 81 detects this loop and energizes the relay 4. As a result, a reset relay 2 is energized at the terminal side by the contact r4. Then a terminal DT of the terminal side is switched to the circuit N, and at the same time a terminal ST of the station side is also switched to the circuit N with de-energization of a relay 5.

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 in the terminal side must be 1) small, inexpensive, and easy to maintain; Various conditions are required, such as 2) power can be supplied from the station side, and 3) switching control can be performed from the station side using the subscriber line. However, it has been difficult to satisfy these requirements with conventional transmission line switching technology.Object of the InventionTherefore, an object of the present invention is to provide a transmission line switching device that satisfies all of the above-mentioned conditions, and that also provides a method for removing faulty lines. It is an object of the present invention to provide a data transmission path monitoring and switching device that can also perform testing, monitoring, etc.

Structure of the Invention In order to achieve the above object, the monitoring switching device according to the present invention is intended for a data transmission line having a regular line and a protection line, and is a polarized self-holding type switching relay having an operation coil and a release coil. is installed on the protection line, and a return relay is installed on the service line. Here, a polarized self-holding type 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 energized. This refers to the type of relay that is used. The regular line is used in preference to the backup line unless there is an accident.

The operating coil of the switching relay is connected between the lines of the standby line via the normally closed contact of the switching relay, and a diode is connected in parallel to the operating coil. The operating coil of the return relay is connected between the lines of the service line via the normally open contact of the switching relay, and a diode is also connected in parallel to the operating coil. The release coil of the switching relay is connected between the lines of the service line by a jumper via the normally open contact of the return relay, and a diode having the same polarity as the diode of the return relay is connected in parallel to the release coil.

In the case of a data transmission line with two regular lines and one protection line, the protection line is a system in which two switching relays similar to the above switching relay are connected in series, except that the polarities of the parallel diodes are reversed. and connect one return relay similar to the above-mentioned return relay to each service line. The operating coil of each switching relay is connected in series with its own normally closed contact, so that the two switching relays correspond one-to-one to the two normal lines.

The operating coil of the return relay of each service line is connected in series with the normally open contact of the corresponding switching relay. The release coil of each switching relay is connected to the corresponding service line by a jumper through the normally open contact of the return relay of the corresponding service line, and a diode of the same polarity as the diode of the return relay is connected in parallel to each release coil. .

In FIG. 1, which shows a circuit diagram of an embodiment of the present invention, a transmission line is located between a station-side device and a terminal-side device, and has a regular line N and a protection line E.

On the terminal side, the operating coil A of a polarized self-holding switching relay l is connected between the lines L3 and L4 of the protection line E through its own normally closed contact r1, and the diode D is connected to this operating coil. Connect in parallel. Regular line N line Ll, L
2, the operating coil A of the return relay 2 is connected via the normally open contact r1 of the switching relay l, and the diode D is connected in parallel to this operating coil A. The release coil RE of the switching relay 1 is.

It is connected between the lines Ll and L2 of the service line N via the normally open contact r2 of the reset relay 2 and the jumper J, and the diode D
is connected in parallel to this release coil RE. The terminal side terminal DT of the transmission line is normally connected to the regular line N by the normally open contact r1 of the switching relay 1, and is connected so as to be switched to the protection line E when the switching relay 1 is activated.

On the station side, there is a power supply 3, a relay 4.5.6, and a selection circuit 7.
Thus, a means for selectively applying the voltage of the power supply 3 to both lines N and H of the transmission line is formed. The selection circuit 7 in the illustrated example includes a loop detection means 81, 82, 83, a monostable circuit M
It has SI, MS2, OR circuit, 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. At time to, when a failure occurs in the current regular line N, the station side manually applies a switching signal FA to the relay 4. Due to the operation of contact r4 of relay 4, wire L is connected from power supply 3.
A positive voltage is applied to line L4, a negative voltage is applied to line L4, and a reverse voltage of diode D is applied to switching relay 1.

Therefore, the switching relay 1 is energized, and the terminal side terminal DT is switched from the regular line N to the protection line E by the relay contact r1. At the same time, the switching relay 1 itself is separated from the protection line E by opening its normally closed contact rl. At this time, on the station side, the loop detection means 83 energizes the relay 5 via the monostable circuit MSI and the flip-flop FF. Contact r5 of relay 5 connects the station side line to time t.
1 to the protection line E, and data transmission is resumed via the protection line E as shown by diagonal lines in FIG.

At the same time as the parallelization of the protection line E on the station side, the relay 6 is activated by the contact r5 of the relay 5, and the power supply 3 is connected to the regular line N by the contact r5, and the loop detection means 81 and 82 are activated. Start monitoring regular line N.

When the fault in the service line N is removed at time t2, a positive voltage is applied from the power supply 3 to iL2 through the contact T4 of the relay 4, which is deenergized at this time, and a negative voltage is applied to the line L1, and the return relay 2 is applied with a negative voltage. Common line N via parallel-connected diode D
A loop is formed. Therefore, the loop detecting means 81 on the station side detects the looping of the regular line N and energizes the relay 4, so that a positive voltage is applied to the line L2 from the power supply 3 to the line L1 of the regular line N via the contact r4. A negative voltage is applied to the

Therefore, on the terminal side, the return relay 2 is energized and the release coil RE of the switching relay 1 is energized, and the terminal side terminal DT is switched from the protection line E to the regular line N. At the same time, the loop detection means 82 detects the monostable circuit MS2.
And the relay 5 is deenergized via the flip-flop FF. Therefore, the station side terminal ST is switched from the protection line E to the regular line N by the relay contact T5, and data transmission via the regular line N is restored at time L3.

Simultaneously with parallelization of the above-mentioned regular lines N, relay 6 and relay 5 are simultaneously deenergized on the station side, and power supply 3 is connected to protection line E through contact r6. This completes the operating cycle.

FIG. 3 shows an embodiment for a transmission line having two regular lines Nl and N2 and one protection line E. In FIG. A polarized self-holding switching relay 1 similar to the switching relay 1 of the embodiment shown in FIG.
1 is connected to one line L5 of the protection line E through its own normally closed contact rll, and one end of a similar switching relay 12 is connected to the other line L of the protection line E through its own normally closed contact r12.
6 and the other ends of the two-way switching relays 11.12 are directly connected, and the Taioh FDs connected in parallel to the operating coils A of the two-way switching relays 11.12 are connected so that they have mutually opposite polarities. A return relay 21 similar to the return relay of the embodiment in FIG. 1 is connected to one of the regular lines N1 via a normally open contact rll of the switching relay 11. A similar return relay 22 is connected to the other regular line N2 via a normally open contact r12 of the switching relay 12. Independent diodes D are connected in parallel to the operating coils A of the resetting relays 21 and 22, respectively. The release coil RE of the switching relay 11 is connected to one of the regular circuits INI via a normally open contact r21 of the return relay 21 and a jumper J. The release coil RE of the other switching relay 12 is connected to the other service line N2 via the normally open contact ``22'' of the return relay 22 and the jumper J.
R is selectively connected to one of the regular lines N1 and the protection line E via a contact rll of the switching relay 11. The other terminal terminal DS is selectively connected to the other regular line N2 and the protection line E via a contact r12 of the 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 backup circuit E in Figure 3 is remotely switched from the station side, and depending on the fault removal, the regular line can be switched to the old 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 due to the station side circuit is ignored, the third
The operation time chart of the circuit shown in the figure is as shown in FIG.

The effects of the data transmission path monitoring and switching device according to the present invention described in detail are as follows.

(a) 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 quickly performed, improving the service level.

(d) It is 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 structure is simple, low-cost mass production is possible.

(f) It is easy to downsize and can be incorporated into a protective device or 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. 1.11.12...Switching relay, 2.21.22...Return relay, A...Operation coil, RE...Release coil, D...
Diode, J...Jumper, N, Nl, N
2... Regular line, E... Protection line, patent applicant
Okura Electric Co., Ltd.

Claims (2)

[Claims] (1) A polarized self-holding type switching relay having an operating coil and an independent release coil connected to the protection line via its own normally closed contact in a data transmission line having a regular line and a protection line, and the above switching relay. a diode connected in parallel to the working coil of the switching relay, a return relay connected to the service line through the normally open contact of the switching relay, a diode connected in parallel to the recovery relay, and a release coil of the switching relay connected to the service line. A monitoring and switching device for a data transmission line, comprising a jumper to be connected, and a diode connected in parallel to the release coil and having the same polarity as the return relay diode. (2) In a transmission line having first and second regular lines and a protection line, each has a polarized self-holding coil having an operating coil and an independent release coil connected to different lines of the protection line through their own normally closed contacts. first and second switching relays of the form;
Means for directly connecting the terminal connected to the protection line and the opposite terminal of the working coils of the two switching relays, each connected in parallel to the working coils of the first and second switching relays and having mutually opposite polarities; diodes, first and second return relays connected to said first and second service lines via normally open contacts of said first and second switching relays, respectively; of said first and second return relays, respectively; Two diodes connected in parallel to the operating coil and having the same polarity as each other connect the release coils of the first and second switching relays to the release coils of the first and second switching relays through the normally open contacts of the first and second release relays, respectively. data comprising a jumper connected to a second service line, and two diodes connected in parallel to the release coils of the first and second switching relays and having the same polarity as the diodes of the first and second return relays. Transmission line monitoring switching device.