JPH03213023A - Power supply interruption information transfer system - Google Patents

Abstract

PURPOSE:To send the power interruption information of a low-order equipment to a high-order equipment without providing a standby power supply on a power supply by looping back a signal received from the high-order equipment when power supply interruption takes place. CONSTITUTION:A signal outputted from a monitoring control circuit 1 in a DSU 2 is inputted to a photocoupler 21 via an outgoing light subscriber line 51. A branching optical coupler 21 branches an inputted optical signal and is outputted to a liquid crystal switch 22 connected to a power supply 20. Since the liquid crystal switch 22 has a characteristic to interrupt the light only when a power supply is applied, the inputted light is transmitted at power interruption and outputted to a synthesis optical coupler 23. The synthesis optical coupler 23 returns only a signal inputted from a liquid crystal optical switch to a remote controller 1 via an incoming optical subscriber line 52 from the synthesis optical coupler 23 because of the power interruption and the absence of input from a terminal equipment 3.

Description

[Detailed Description of the Invention] [Summary] Regarding the power failure information transfer method for in-home equipment, the purpose is to continuously monitor the power supply and easily determine whether the power is cut off or a failure directly related to the equipment. A first coupler that branches a received optical signal, a second coupler that returns the optical signal branched by the first coupler to a host device, and an optical switch that transmits the optical signal in response to power-off information. ,
A power-off information transfer system characterized in that when a power-off occurs in the monitored device, a signal received by the host device is returned as is.

[Industrial application field]

The present invention relates to a power outage information transfer method, and particularly to a monitoring method for in-home equipment whose power is frequently turned on and off.
It is necessary to notify the host device (monitoring device) of this information and generate an alarm (sounding an alarm or lighting an indicator light) to make the operator aware of the occurrence of an abnormality. However, in the home devices currently in use, the power is usually turned off when not in use and turned on when in use, and the status is transmitted when not in use or when a 1KB disconnection occurs. It is necessary to make the monitoring device on the side aware of this.

[Prior Art] FIG. 3 shows a diagram of a conventional DSU (digital service unit).

In the figure, when transmitting and receiving information between a host device 1 (hereinafter referred to as a supervisory control device) and a lower order device 3 (hereinafter referred to as a terminal device), the functions and functions of a DSU (digital service unit) placed between these devices are shown. An example of the operation will be explained using FIG. 5.

First, in the downstream signal processing, the optical signal from the monitoring and control device 1 is sent to the optical/electrical converter (0/E) via the downstream optical subscriber line 51.
41. This optical/electric conversion circuit (0/E) 4
1 performs processing to convert an optical signal into an electrical signal as shown in FIG. 5, and outputs it to the subscriber line termination section 42. The subscriber line termination unit 42 synchronizes the input signals with the frames and outputs a control signal (for example, abnormal transmission or return control on the monitoring side '4B).
is separated, subjected to frame aligner (phase correction), and output to the inter-device INF 43. The inter-device INF 43 creates a frame according to the frame on the terminal side, performs U/B conversion, and outputs it to the terminal 3.

Next, in uplink signal processing, the input frame data at the terminal 3 is output to the inter-device INF 44 for loopback of the DSU. After performing B/U conversion, the inter-device INF 44 establishes synchronization with the frame on the terminal side and sends it to the subscriber line sending unit 4.
Output to 5. The subscriber line transmitter 45 separates the control signal from the terminal, performs frame aligner (phase correction), creates a frame according to the frame of the supervisory control device 1, and
It is output to the E converter 46. The O/E converter 46 converts the electrical signal into an optical signal, and then sends the signal to the supervisory control device via the upstream optical subscriber line 52.

In the DSU 4 which operates as described above, when the power supply 47 is cut off (power outage or switch disconnection), it is necessary to notify the supervisory control device 1 that the power supply has been cut off. In the case of a power outage, the system will return to normal when the power is restored (recovery from power outage, switch ON, etc.), but when other failures (such as subscriber line disconnection) occur, it is necessary to restore the failure directly related to the equipment. Therefore, it is necessary to detect this separately from power outages, etc. As shown in FIG. 4, a method for detecting a power outage is to use a large capacity capacitor (capacitor) connected in parallel to the voltage detection circuit 471 when the voltage detection circuit 471 detects a power outage. The circuit is operated for a short time using the electric power stored in the power supply, and the power-off information is notified to the supervisory control device 1.

[Problem to be solved by the invention]

However, the conventional method of separately detecting a power outage and a failure directly related to the device (such as a disconnection of an optical subscriber line) has the problem that an auxiliary power source is provided separately from the power source 47, which increases the size of the device. occurs. Also, when the power is turned off,
It only sends power outage information in a short period of time, and the monitoring control device 1
When the terminal 3 is reset for some reason, a problem may occur in which the supervisory control device 1 cannot grasp that the terminal 3 is powered off.

Therefore, it is an object of the present invention to continuously monitor the power supply and easily determine whether the power supply is cut off or a failure directly related to the device.

[Means to solve the problem]

The above problem consists of a first coupler that distributes the optical signal from the host device, a second coupler that returns the optical signal branched by the first coupler to the host device, and a second coupler that distributes the optical signal from the host device based on power outage information. A transmitting optical switch is provided so that when a power failure occurs, the signal received from the host device is returned as is.

[Effect]

According to the present invention, when a power outage is detected in a lower-level device, the optical switch that transmits light based on the power-off information returns the signal sent by the higher-level device to the transmitting side as it is. In this case, it is possible to always receive and receive signals from lower-level devices.

〔Example] Embodiments of the present invention are shown in FIGS. 1 and 2.

In the figure, 1 indicates a supervisory control device, 2 indicates a DSU (digital service unit), and 3 indicates a terminal.

Further, 2 is composed of a power supply 20, a coupler 21゜23, a liquid crystal optical switch 22, an O/E converter 24, a subscriber line termination section 25, an inter-device lNF 26, 27, a subscriber line sending section 28, and an E10 converter 20WY. ing.

A detailed explanation will be given below according to the drawings.

In the figure, the normal operation is as described in the prior art.

The operation when the power is turned off will be explained below. During normal operation (before a power outage occurs), data is transmitted and received from the supervisory control device 1 in a frame-to-mat format as shown in FIG. 2(a).

For example, control information is added to the last 8 bits of data in this frame format, and when the data is sent from the supervisory control device 1, a signal indicating that the supervisory control device 1 has sent it as shown in FIG. ") is added, and when the terminal 3 sends a signal, a signal indicating that the terminal has transmitted as shown in FIG. 2(C) (for example, rllllo
ooo”) is added. Here, for example, the operation when the user turns off the power of the terminal 3 will be explained.

In the DSU 2, the signal output from the supervisory control circuit 1 is input to the optical coupler 21 via the optical subscriber line 51.

The branching optical coupler 21 branches the input optical signal and outputs it to a liquid crystal switch 22 connected to the power supply 20.

The liquid crystal switch 22 normally has a characteristic of blocking light only when the power is on, so when the power is off, it transmits the input light and outputs it to the combining optical coupler 23. In the combining optical coupler 23, since the power is cut off, there is no input from the terminal 3 side, so only the signal input from the liquid crystal optical switch goes up from the combining optical coupler 23 and is sent to the monitoring and control device 1 via the optical subscriber line 52. will be returned to. At this time, the supervisory control device 1 determines that the signal is a signal sent from the supervisory control circuit engineer based on the control information added at the time of transmission, and detects a power outage on the terminal 3 side.

〔Effect of the invention〕

As shown above, in the present invention, it is possible to send power-off information of a lower-level device to a higher-level device without providing a backup power source in the power supply, so it is possible to reduce the scale of the device, and furthermore, the higher-level device can It is now possible to know the status of the equipment one by one.

[Brief explanation of drawings]

Fig. 1 is an embodiment of the present invention, Fig. 2 is a diagram showing a frame format in the present invention, Fig. 3 is a block diagram of a conventional DSU (digital service unit), Fig. 4 is a block diagram of an auxiliary power supply, Figure 5 shows the operation of the DSU. In the figure, 1... Upper device, 2, 4... DSU, 3... Lower device, 20.47... Power supply, 21... Branch Coupler for use, 22...Liquid crystal optical switch, 23...Coupler for synthesis, 24°41...O/E converter, 25.42...
・Subscriber line termination section, 26, 27, 43.44... Inter-device INF, 28° 42... Subscriber line sending section, 29.4
6... E10 converter, 51.52... Optical subscriber line,
471... Voltage detection circuit, 472... Capacitive element.

Claims (1)

[Scope of Claim] A monitoring system in which a lower-level device is monitored by a higher-level device using an optical transmission line, comprising: a first coupler that branches an optical signal received by the lower-level device; It is equipped with a second coupler that returns the optical signal received from the host device to the host device, and an optical switch that transmits the optical signal based on power-off information. A power-off information transfer method characterized by being configured to loop back.