JPH03192931A - Protection switching device with detouring circuit - Google Patents

Abstract

PURPOSE:To enhance the reliability without generating an alarm signal at a standby state communication equipment by using a distribution circuit so as to distribute an input signal to the detouring communication equipment and an active communication equipment and detouring the distribution circuit when the circuit is faulty. CONSTITUTION:A bipolar signal 21 being an input signal fed to a distribution circuit 24 is divided into bipolar signals, 33, 34. The bipolar signal 33 outputted from the distribution circuit 24 is fed to the active communication equipment via an active side relay 37 and an active side communication equipment input terminal 38 of a 2nd switching relay 36 and the bipolar signal 34 is fed to the standby communication equipment via a standby side relay 39 and a standby side communication equipment input terminal 41 of the 2nd switching relay 36. Even when a fault takes place in the distribution circuit 24, the input signal is fed to the communication equipment by a detouring circuit 26 immediately. Thus, the reliability is ensured without generating an alarm signal representing an input signal interrupt from the standby side communication equipment.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a protection switching device for a duplex system of communication equipment.

[Conventional technology]

When communicating data or signals, in order to ensure a high degree of reliability, a redundant system is sometimes used in which multiple identical communication devices are arranged to perform various types of processing. In such a duplex system, input signals are processed in parallel by both communication devices. The output of a duplex system is usually a signal processed by one of the communication devices in operation. If the communication device in operation fails, the signal is immediately switched to the signal processed by the other communication device on standby and output.

In such a duplex system, it is necessary to distribute input signals and supply them to both the operating communication device and the standby communication device.

FIG. 3 shows a schematic configuration of a protection switching device for a conventional duplex system that distributes input signals using a hybrid transformer.

Input signal 11 is distributed by a hybrid transformer arranged in distribution section 12 . The divided input signals are each amplified by an amplifier circuit (not shown) to compensate for the attenuation, and then outputted from the distributor 12. One of the distributed input signals 13 is supplied to an operating communication device (not shown) and undergoes necessary processing. The other input signal 14 is supplied to a standby communication device (also not shown), and necessary processing is similarly performed.

An output signal 15 from the communication device on the active side and an output signal 16 from the communication device on the standby side are each supplied to the input side of the output selection switch 17. The output selection switch 17 normally selects the output signal 15 from the active communication device and outputs it from the input signal distribution section. The output selection switch 17 is
When a failure occurs in the communication device on the active side, the connection is immediately switched and the output signal 16 from the communication device on the standby side is output.
It is designed to ensure continuity of communication.

FIG. 4 shows a schematic configuration of a protection switching device for a conventional duplex system that switches lines using a relay.

The human input signal 11 is supplied to an input selection switch 18, and is supplied to either an active communication device or a standby communication device (not shown). The output selection switch 17 is connected to the communication device on the same side as the input selection switch I8.

[Problem to be solved by the invention]

However, with conventional protection switching devices for duplex systems that use hybrid transformers, if a circuit failure or power outage occurs in the amplifier circuit installed in the distribution section 12, communication cannot be continued, and sufficient Reliability cannot be ensured.

Furthermore, when switching lines using a relay, it is not possible to distribute the input signal and apply it to the active communication device and the standby communication device at the same time, so the standby communication device generates an alarm signal indicating that the input signal is disconnected. There is a drawback.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a highly reliable protection switching device that does not generate an alarm signal in a communication device on the standby side.

[Means to solve the problem]

The protection switching device with a detour circuit of the present invention is (i) a protection switching device that switches the route of an input signal of a duplex system consisting of communication devices on the active side and a communication device on the standby side, and (ii) switches the input signal between the communication devices on the active side and the communication device on the active side. (iii) a detour means for bypassing the distribution means and supplying the input signal to the communication devices; (iv)
an abnormality detection means for detecting an abnormality in the signal of the distribution means and outputting an abnormality detection signal; and (v) switching the path of the input signal from the distribution means to the detour means upon receiving the abnormality detection signal from the abnormality detection means. (vi) after switching the route of the human signal to the detour means by the switching means;
When an alarm signal indicating disconnection of the input signal is supplied from the communication device on the operating side, the route of the human signal is returned to the distribution means, and when the alarm signal is not supplied, the route of the input signal is maintained in the detour means. and control means for controlling the switching means so as to.

That is, in the protection switching device with a detour circuit of the present invention, the distribution means distributes the human signal and supplies it to the communication device on the active side and the communication device on the standby side, and in the event of a failure of this distribution means, the signal is bypassed. .

〔Example〕

Hereinafter, the present invention will be described in detail with reference to Examples.

The protection switching device with detour circuit in one embodiment of the present invention is as follows:
It is equipped with a circuit section 19 and a control [20] for controlling the circuit section 19.

FIG. 1 shows a schematic configuration of a circuit section of a protection switching device with a detour circuit.

A bipolar signal 21, which is an input signal, is supplied from an input terminal 22 via a first switching relay 23 to a distribution circuit 24 or a detour path 26 depending on its connection state.

The bipolar signal 21 supplied to the distribution circuit 24 is supplied to the bipolar-unipolar converter 28 via the receiver 27, converted into a unipolar signal 29, and then distributed. The unipolar signal 29 after being distributed is supplied to a first unipolar-bipolar converter 31 and a second unipolar-bipolar converter 32, each of which converts the bipolar signal 3
3.34. The distribution circuit 24 includes a failure detection section (not shown), which detects disconnection of the circuit's power supply or input signal and outputs a failure detection signal. The distribution circuit 24 is composed of various active elements.

The bipolar signal 33 output from the distribution circuit 24 is supplied to a working communication device (not shown) via a working relay 37 of the second switching relay 36 and a working communication device input terminal 38. . Further, the bipolar signal 34 is supplied to a standby communication device (not shown) via a standby relay 39 of the second switching relay 36 and a standby communication device input terminal 41.

Further, the circuit section 19 includes a communication device switching section 44 consisting of a bypass route switching relay 42 and an output switching relay 43.

The input side of the bypass route switching relay 42 is connected to one output side of the first switching relay 23 via the bypass route 26 . One output side of the detour switching relay 42 is connected to the input side of the working relay 370 via the working detour 46 . The other output side of the detour route switching relay 42 is connected to the input side of the standby relay 39 via a standby detour route 47 .

One end of a working output path 48 is connected to one input side of the output switching relay 43, and one end of a standby output path 49 is connected to the other input side.

At the other end of these output paths 48 and 49, there is a working side output terminal 5.
1 and the standby side output terminal 52 are connected to each other. The output switching relay 43 selectively connects one of the active output path 48 and the standby output path 49 to the other end of the output path 54 whose one end is connected to the output terminal 53 . The output switching relay 43 is configured to switch in conjunction with the detour route switching relay 42.

FIG. 2 shows the system configuration of the protection switching device with a detour circuit.

The communication device 56 on the operating side and the communication device 57 on the standby side each detect the disconnection of the input signal and supply a manual signal disconnection alarm signal 58,59 to the control unit 20 of the protection switching device with detour circuit. The control unit 20 generates a human power signal disconnection alarm signal 58.
59, a switching control signal 61 is supplied to the bypass route switching relay 42 and the output switching relay 43 of the circuit section 19. Further, the control unit 20 receives the fault detection signal 62 from the distribution circuit 24 of the circuit unit 19 and controls the first switching relay 2
A switching control signal 61 is supplied to the switching relay 3 and the second switching relay 36.

Next, the operation when a failure occurs in the protection switching device with detour circuit configured as described above will be described.

Assume now that only the human power signal disconnection alarm signal 58 is supplied to the control unit 20. In this case, the control unit 20 determines that a failure has occurred in the active communication device 56, and supplies the communication device switching unit 44 with a switching control signal 61 for switching to the standby communication device 57. Then, the detour route switching relay 42 switches the detour route 26 to connect with the standby side detour route 47, and the output switching relay 43 switches the output route 54 to connect with the standby side output route 49.

Next, it is assumed that the input signal disconnection alarm signals 58 and 59 and the fault detection signal 62 from the distribution circuit 24 are supplied to the control section 20. In this case, the control unit 20 supplies the switching control signal 61 to the first switching relay 23 and the second switching relay 36. First switching relay 23 and second switching relay 36
receives the switching control signal 61 and switches the connections from the distribution circuit 24 side to the detour route 26, the active detour route 46, and the standby detour route 47, respectively.

Bipolar signal 2 input by switching this connection
1 is supplied only to the communication device connected by the bypass route switching relay 42. As shown in FIG. 1, it is assumed that the bypass route switching relay 42 is connected to the operating side bypass route 46, and the bipolar signal 21 is supplied to the operating side communication device 56.

If the input signal disconnection alarm signal 58 is supplied even after the bipolar signal 21 bypasses the distribution circuit 24 and is supplied to the communication device 56 on the active side, the control unit 20 determines that it is not a failure of the distribution circuit 24 but a failure of the line. to decide. And the control section 20
supplies the switching control signal 61 to the first switching relay 23 and the second switching relay 36, switches the connection to the distribution circuit 24 side again, and enters the state of waiting for a human input signal from the line.

On the other hand, the bipolar signal 21 bypasses the distribution circuit 24 and is transmitted to the operating side! [If the supply of the input signal disconnection alarm signal 58 is stopped after being supplied to the input signal disconnection alarm signal 56, the control unit 20 uses a timer (not shown) to return the input signal to the distribution circuit 24 side again after a certain period of time has elapsed. If the human power signal disconnection alarm signal 58 is still being supplied to the distribution circuit 24 side after returning to the distribution circuit 24 side, the control unit 20
is determined to be a fault in the distribution circuit 24, and is held on the bypass route side. If the supply of the input signal disconnection alarm signal 58 is stopped due to the return to the distribution circuit 24 side, the control unit 20
determines that the momentary interruption is caused by the line or distribution circuit 24, and maintains the connection on the restored distribution circuit 24 side.

In this way, in this embodiment, it is possible to distinguish between instantaneous interruptions in lines and distribution circuits 24, and to distinguish between communication devices 56 and 24 on the operating side.
Appropriate input/output signal paths to the communication device 57 on the standby side can be set.

In addition, if the power to the protective switching device with detour circuit is cut off,
The first switching relay 23 and the second switching relay 36 are automatically switched to the detour route 26, the active detour route 46, and the standby detour route 47, respectively. On the other hand, since the communication device switching section 44 uses a contact-holding type relay, the current connection state is always maintained.

〔Effect of the invention〕

As described above, according to the present invention, since the input signal is supplied to both the active communication device and the standby communication device by the distribution means, an alarm signal indicating that the input signal is disconnected is not outputted in the standby communication device. There isn't. Further, even if a failure occurs in the distribution means, the human input signal is immediately supplied to the communication device via the bypass route, so it is possible to provide a highly reliable protection switching device with a bypass circuit.

[Brief explanation of drawings]

1 and 2 are for explaining one embodiment of the present invention, of which FIG. 1 is a circuit diagram showing an outline of the circuit section of a protection switching device with a detour circuit, and FIG. FIG. 3 is a schematic configuration diagram of a conventional protection switching device using a hybrid transformer, and FIG. 4 is a schematic configuration diagram of a conventional protection switching device that switches lines using a relay. 19...Circuit section, 20...Control section, 2
1... Bipolar signal, 23... First switching relay, 24...
Distribution circuit, 26... Detour route, 36... Second switching relay, 44... Communication device switching unit, 6... Operating side detour route, 7... Standby side detour route, 6... Active side communication device, 7... Standby side communication device, 2... Fault detection signal.

Claims (1)

[Claims] A protection switching device that switches the input signal path of a duplex system consisting of active and standby communication devices, which distributes and supplies input signals to the active and standby communication devices. distribution means; detour means for bypassing the distribution means and supplying an input signal to the communication device; abnormality detection means for detecting an abnormality in the signal of the distribution means and outputting an abnormality detection signal; and this abnormality detection means. switching means for switching the route of the input signal from the distribution means to the detour means in response to an abnormality detection signal supplied from the operating side; and after the switching means switches the route of the input signal to the detour means, When an alarm signal indicating disconnection of the input signal is supplied from the device, the route of the input signal is returned to the distribution means, and when the alarm signal is not supplied, the route of the input signal is maintained in the detour means. and a control means for controlling the switching means.