JP2023057111A - Emergency facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tunnel emergency facility with high failure resistance using an optical line which can appropriately cope with a problem of a metal line and tunnel extension.

SOLUTION: An active optical line 14-1 and a standby optical line 14-2 are connected with a disaster prevention reception panel 12, and a plurality of relay amplifiers 20 are connected with a terminal device 22. Facility devices of fire detectors 25 and fire hydrant devices 24 are connected with the active optical line 14-1. When the active optical line 14-1 between the disaster prevention reception panel 12 and the relay amplifiers 20 is disconnected, the disaster prevention reception panel 12 transmits and receives optical signals by the standby optical line 14-2 in addition to the active optical line 14-1. The optical relay amplifier 20 which detects a disconnection failure performs bypass relay of the optical signals between an upstream side and a downstream side of the standby optical line 14-2 and the active optical line 14-1, and maintains transmission and reception of all the optical signals even when the disconnection failure occurs.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2023,JPO&INPIT

Description

TECHNICAL FIELD The present invention relates to emergency equipment for monitoring an abnormality in a tunnel by connecting equipment such as a fire detector and a fire hydrant installed in the tunnel to a disaster prevention receiving panel of a monitoring center via an optical line.

2. Description of the Related Art Conventionally, emergency equipment is installed in tunnels such as motorways to protect people and vehicles from fire accidents that occur in the tunnels.

As such emergency equipment, fire detectors, manual reporting devices, and emergency telephones are installed to monitor and report fires, and fire hydrants are installed to extinguish fires and prevent the spread of fire. In order to protect against fire, a water spray head that sprays water for fire extinguishing is installed, and the equipment of the emergency equipment is connected to the transmission line from the disaster prevention receiver installed in the monitoring center and monitored and controlled. are constructing tunnel emergency equipment.

Tunnel emergency equipment, which consists of a disaster prevention receiving panel and equipment, is roughly divided into the R-type transmission system and the P-type direct transmission system. In the R-type transmission system, equipment such as a fire detector with an address is connected to the transmission line using a signal line cable drawn from the disaster prevention receiver panel, and individual management is performed to detect and control each equipment by transmission control. In the P-type direct delivery method, equipment is divided into predetermined division units according to the type of equipment, and multiple equipment belonging to the same division is connected to the signal line drawn out for each division, and detection is performed for each signal line. control.

Tunnel emergency equipment using the R-type transmission system can detect and control individual equipment, so there are various advantages in terms of function and management. Moreover, if the transmission distance is long, it is necessary to install a repeater amplifier board, which increases the cost.

On the other hand, the P-type direct transmission tunnel emergency equipment does not require a transmission control function in the fire detector, and even if the transmission distance is long, there is no need to install a repeater amplifier panel. Compared to , the system configuration is simple and inexpensive, but in addition to the inability to individually manage detection and control for each piece of equipment, the type of equipment such as fire detectors and manual reporting devices and the division of equipment Since separate dedicated signal lines are drawn out to connect the equipment, the number of wires increases, and if the tunnel length is long, the system configuration cost may rather increase.

Considering the advantages and disadvantages of the R-type transmission system and the P-type direct transmission system, tunnel length, vehicle traffic volume, etc., as tunnel emergency equipment, build tunnel emergency equipment for the R-type transmission system or P-type direct transmission system. I am trying to

JP-A-2002-246962 JP-A-11-128381 JP 2001-357481 A

By the way, in the recent tunnel emergency equipment, equipment is connected to the metal transmission line that pulls out the signal cable from the disaster prevention receiving panel, and the metal transmission line is easily affected by electrical noise. As the transmission distance increases, the signal attenuation increases, so a repeater amplifier board is installed at each predetermined distance. Furthermore, if the usage period is prolonged, the electrical characteristics may deteriorate due to deterioration of the insulation, etc., and communication failure may occur. have a nature. Furthermore, in recent years, there is a tendency for tunnel lengths to exceed 10 kilometers, which makes it difficult for metal transmission lines to cope with these problems.

In order to solve this kind of problem, it is conceivable to use an optical line using optical fiber cables as the transmission line for tunnel emergency equipment, but there is no example of using an optical line for tunnel emergency equipment. A new issue is the construction of tunnel emergency equipment.

In addition, when an optical line is used for tunnel emergency equipment, it is possible to reliably maintain the communication connection between the disaster prevention receiving panel and the terminal side in the event of a failure such as a disconnection of the optical line or a decrease in the strength of the optical signal. Recovery is required.

SUMMARY OF THE INVENTION It is an object of the present invention to provide highly fault-tolerant emergency equipment using an optical line that can appropriately cope with the problem of metal lines and the increase in tunnel length.

(Responding to disconnection faults in emergency equipment)
The present invention is an emergency equipment for monitoring and controlling an abnormality in a tunnel,
disaster prevention receiver,
A normal optical line and a standby optical line for performing optical signal communication between the equipment on the terminal side installed in the tunnel and the disaster prevention receiving panel;
a plurality of optical repeaters connected in the middle of each line of the regular optical line and the standby optical line;
a terminating device connected to each line termination of the regular optical line and the standby optical line;
with
The optical repeater is
Normally, optical signals are relayed between the upstream and downstream sides of the regular optical line and between the upstream and downstream sides of the backup optical line,
When a disconnection failure on the upstream side of the regular optical line is detected, a disconnection failure signal is sent to the disaster prevention receiving panel or another optical repeater adjacent to the upstream side via the backup optical line, transmitting and receiving a signal, and detouring and relaying the optical signal between the upstream side of the standby optical line and the upstream and downstream sides of the regular optical line;
When a disconnection failure signal is received from another optical repeater or terminating device located on the downstream side, the optical signal is relayed between the upstream side and the downstream side of the regular optical line, and the upstream side of the regular optical line and the backup. detouring and relaying the optical signal between the downstream side of the optical line for
The disaster prevention receiver is
Normally, optical signals are sent and received via regular optical lines,
When a disconnection failure signal is received from an optical repeater adjacent to the downstream side, the optical signal is transmitted and received through the standby optical line in addition to the regular optical line,
When the terminating device detects a disconnection fault in the regular optical line, it transmits a disconnection fault signal to the adjacent optical repeater on the upstream side via the backup optical line to transmit and receive optical signals through the backup optical line. , detouring and relaying the optical signal between the standby optical line and the regular optical line,
It is characterized by In addition, the emergency equipment of the present invention is
A plurality of equipment devices connected in the middle of a regular optical line,
It is branched and connected to the common optical line and connected to the equipment by the signal line, converts the optical signal received from the common optical line into an electrical signal and outputs it to the equipment, and converts the electrical signal input from the equipment into an optical signal. an optical converter that converts the signal into a signal and transmits it to a common optical line;
Prepare.

Here, the upstream side means the side closer to the disaster prevention receiving panel, and the downstream side means the side closer to the terminating device.

(Monitoring of disconnection failure by test signal)
The disaster prevention receiver periodically transmits a test signal to the regular optical line,
The optical repeater and the terminating device detect disconnection failure of the regular optical line when the test signal from the disaster prevention receiving panel is cut off.

(Response to light intensity drop failure of emergency equipment)
In another aspect of the present invention, an emergency facility for monitoring and controlling an abnormality in a tunnel,
disaster prevention receiver,
A normal optical line and a standby optical line for performing optical signal communication between the equipment on the terminal side installed in the tunnel and the disaster prevention receiving panel;
a plurality of optical repeaters connected in the middle of each line of the regular optical line and the standby optical line;
a terminating device connected to each line termination of the regular optical line and the standby optical line;
with
The optical repeater is
Normally, optical signals are relayed between the upstream and downstream sides of the regular optical line and between the upstream and downstream sides of the backup optical line,
When an optical signal intensity drop failure received from the upstream side of a regular optical line is detected, an optical intensity drop failure signal is sent to the disaster prevention receiving panel or another optical repeater adjacent to the upstream side via the backup optical line. Then, the transmission and reception of optical signals through the normal optical line are stopped, and optical signals are transmitted and received through the backup optical line, and optical signals are transmitted between the upstream side of the backup optical line and the upstream and downstream sides of the normal optical line. relay relay,
When an optical intensity drop failure signal is received from another optical repeater or terminating equipment located on the downstream side, transmission and reception of optical signals via the normal optical line are stopped, and the upstream side of the normal optical line and the downstream side of the backup optical line are switched. detour relaying optical signals between
The disaster prevention receiver is
Normally, optical signals are sent and received via regular optical lines,
When an optical intensity drop failure signal is received from an optical repeater adjacent to the downstream side, the optical signal transmission/reception via the normal optical line is stopped, and the optical signal is transmitted/received via the backup optical line,
When the terminating equipment detects an intensity drop fault in the optical signal received from the regular optical line, it transmits an optical intensity drop fault signal to the adjacent optical repeater on the upstream side via the backup optical line, thereby removing the regular optical line. stop the transmission and reception of optical signals by and relay the optical signals by detouring between the standby optical line and the regular optical line;
It is characterized by In addition, the emergency equipment of the present invention is
A plurality of equipment devices connected in the middle of a regular optical line,
It is branched and connected to the common optical line and connected to the equipment by the signal line, converts the optical signal received from the common optical line into an electrical signal and outputs it to the equipment, and converts the electrical signal input from the equipment into an optical signal. an optical converter that converts the signal into a signal and transmits it to a common optical line;
Prepare.

(Monitoring of light intensity drop failure by test signal)
The disaster prevention receiver periodically transmits a test signal to the regular optical line,
The optical repeater and the terminating equipment detect an optical signal intensity drop failure when the received level of the test signal drops below a predetermined threshold.

(Disconnection monitoring of standby optical line by circulating test signals)
The disaster prevention receiver periodically transmits a test signal to the regular optical line,
When the optical repeater receives a test signal from the upstream side of the regular optical line, it relays the test signal to the downstream side of the regular optical line. Relay the test signal to the upstream side of the optical line,
The terminating equipment transmits the test signal to the protection optical line when it receives the test signal from the regular optical line.

(Disconnection monitoring of standby optical line by loopback of test signal)
When the optical repeater receives a test signal from the upward side of the regular optical line, the optical repeater relays the test signal to the downward side of the regular optical line and also loops back and repeats the test signal to the upward side of the protection optical line.

(Disconnection judgment of standby optical line by disaster prevention receiver board)
When the disaster prevention receiving board does not receive the test signal from the standby optical line within a predetermined waiting time after transmitting the test signal, the disaster prevention receiver determines that the standby optical line is broken, and the optical repeater adjacent to the downstream side. transmission of a test signal via the regular optical line, and notifies of disconnection of the protection optical line between the adjacent optical repeater on the downstream side.

(Disconnection determination of standby optical line by optical repeater)
If no test signal is received from the downstream side of the backup optical line within a predetermined waiting time after transmitting the test signal to the downstream side of the regular optical line, the optical repeater will Disconnection is determined, and the other optical repeater adjacent to the downstream side or the terminal equipment adjacent to the downstream side is instructed to transmit a test signal via the regular optical line, and the emergency optical line for the upstream is set to the emergency optical line. to transmit a disconnection failure signal indicating disconnection of the backup optical line between the downstream side adjacent optical repeater or the disconnection of the backup optical line between the downstream side adjacent terminating equipment. inform.

(Waiting time for disaster prevention receiver and optical repeater)
The waiting time for judging disconnection of the standby optical line is set so that the time from the terminating device to the disaster prevention receiving panel becomes longer in sequence.

(Effects of dealing with disconnection failures in emergency equipment)
The present invention includes predetermined equipment, a disaster prevention receiver for monitoring the equipment, a regular optical line connected to the disaster prevention receiver, a backup optical line connected to the disaster prevention receiver, a regular optical line and a backup. A plurality of optical repeaters connected in the middle of each optical line for general use, a terminating device connected to each line end of the normal optical line and the standby optical line, branched and connected to the normal optical line, and facility equipment connected by a signal line to convert the optical signal received from the common optical line into an electrical signal and output it to the equipment, and convert the electrical signal input from the equipment into an optical signal and transmit it to the common optical line The equipment is connected to the regular optical line, and the optical repeater is normally connected between the upstream and downstream sides of the regular optical line and between the backup optical line. Each optical signal is relayed between the upstream side and the downstream side, and when a disconnection failure on the upstream side of the regular optical line is detected, a standby optical line is connected to the disaster prevention receiver or another optical repeater adjacent to the upstream side. to transmit and receive the optical signal through the backup optical line, and detour relay the optical signal between the upstream side of the backup optical line and the upstream and downstream sides of the regular optical line, When a disconnection failure signal is received from another optical repeater or terminating equipment located on the downstream side, the optical signal is relayed between the upstream side and the downstream side of the regular optical line, and the upstream side of the regular optical line The optical signal is detoured and relayed between the downstream side of the standby optical line, and the disaster prevention receiving panel normally transmits and receives optical signals via the regular optical line, and receives a disconnection failure signal from the adjacent optical repeater on the downstream side. If received, the optical signal is transmitted and received by the backup optical line in addition to the normal optical line, and when the termination device detects a disconnection fault in the normal optical line, it sends a disconnection fault signal to the adjacent optical repeater on the upstream side. is sent to transmit and receive optical signals through the standby optical line, and optical signals are detoured and relayed between the standby optical line and the regular optical line. If the normal optical line is disconnected, the disconnection failure is detected by the optical repeater located on the downstream side of the disconnection point, and by sending a disconnection failure signal to the disaster prevention receiver via the standby optical line, the disaster prevention receiver An optical repeater that transmits and receives optical signals to the backup optical line in addition to the regular optical line and detects a disconnection failure repeats the optical signal by detouring between the backup optical line and the normal optical line. The optical converter connected to the downstream side transmits and receives the optical signal that has been returned from the standby optical line to the regular optical line by the detour relay from the optical repeater. To continuously transmit and receive optical signals between a disaster prevention receiving panel and all optical converters connected to a common optical line.

If such a disconnection failure of a common optical line occurs between optical repeaters or between an optical repeater and a terminating device, the detour relay from the optical repeater or the terminating device that detects the disconnection failure will occur. As a result, the optical converter connected to the downstream side of the disconnection point transmits and receives the optical signal that is returned from the backup optical line to the regular optical line. To continuously transmit and receive optical signals to and from all optical converters connected to a line.

(Effect of monitoring disconnection failure by test signal)
In addition, the disaster prevention receiver periodically transmits a test signal to the regular optical line, and the optical repeater and the terminating device detect disconnection of the regular optical line when the test signal from the disaster prevention receiver is interrupted. Therefore, the state of the regular optical line that is normally used is constantly monitored, and in the event of a line failure such as disconnection, the optical repeater or terminal equipment located downstream of the disconnection point is disconnected. Faults are detected, recovery is performed reliably against disconnection faults in optical circuits, fault tolerance is improved, and reliability of communication is ensured.

(Effects of dealing with light intensity drop failures in emergency equipment)
Further, in another aspect of the present invention, a predetermined equipment, a disaster prevention receiver for monitoring the equipment, a regular optical line connected to the disaster prevention receiver, and a spare connected to the disaster prevention receiver Compatible with optical lines, multiple optical repeaters connected in the middle of each optical line for normal use and backup optical lines, terminating equipment connected to the end of each line for normal use optical lines and backup optical lines, and facility equipment It is branched and connected to a common optical line and connected to equipment by a signal line, and converts the optical signal received from the common optical line into an electrical signal and outputs it to the equipment and the electricity input from the equipment An emergency facility equipped with an optical converter that converts a signal into an optical signal and transmits it to a regular optical line. When each optical signal is relayed between the upstream side and the downstream side of the line and between the upstream side and the downstream side of the protection optical line, and the strength reduction failure of the optical signal received from the upstream side of the regular optical line is detected. transmits an optical intensity drop failure signal to the disaster prevention receiving panel or another optical repeater adjacent to the upstream side via the standby optical line to stop the transmission and reception of optical signals over the normal optical line, and the standby optical line transmits and receives optical signals by means of the optical relay equipment, relays the optical signals between the upstream side of the backup optical line and the upstream and downstream sides of the regular optical line, and transfers the optical signals from other optical repeaters or terminating equipment located on the downstream side. In the event that an optical intensity drop failure signal is received, transmission and reception of optical signals via the normal optical line are stopped, and optical signals are relayed between the upstream side of the normal optical line and the downstream side of the backup optical line to prevent disasters. The control unit of the receiving panel normally sends and receives optical signals through the regular optical line, and when it receives an optical intensity drop failure signal from the optical repeater adjacent to the downstream side, it sends and receives optical signals through the regular optical line. When the terminating equipment detects that the strength of the optical signal received from the regular optical line has decreased, the terminating equipment connects the optical repeater to the backup optical line to the optical repeater adjacent to the upstream side. to stop the transmission and reception of optical signals through the normal optical line by transmitting an optical intensity drop failure signal via the , and to relay the optical signal between the backup optical line and the normal optical line. If an optical relay device connected adjacent to the disaster prevention receiver board detects a drop in optical signal level due to a poor connection of the optical connector of the common optical line on the board, disaster prevention reception for the common optical line is detected. Transmission and reception of optical signals from the board is stopped, and is switched to transmission and reception of optical signals to the standby optical line instead, and the optical repeater that detects the optical intensity drop failure is switched from the standby optical line to the upstream side of the regular optical line. and relays the optical signal to the downstream side by detouring, so that the optical converter connected to the downstream side such as the connection failure point of the optical connector is looped back from the standby optical line to the regular optical line by the detouring relay of the optical repeater. Therefore, even if an optical intensity drop failure occurs in a common optical line, optical signals can be continuously transmitted and received to and from all optical converters connected to the common optical line. make it possible.

In addition, since transmission and reception of optical signals to the regular optical line are stopped from the disaster prevention receiving panel that has caused a connection failure of the optical connector, etc., collision with the optical signal relayed from the backup optical line by the optical repeater may occur. no.

(Effect of monitoring light intensity drop failure by test signal)
In addition, the disaster prevention receiving board periodically transmits a test signal to the common optical line, and the optical repeater and the terminating equipment detect an optical signal intensity drop failure when the reception level of the test signal drops below a predetermined threshold. is detected, the drop in the optical signal strength of the regular optical line that is normally used is constantly monitored. An optical intensity drop failure is detected by a repeater or a terminal device, recovery from the optical intensity drop failure is reliably performed, fault tolerance is improved, and reliability of communication is ensured.

(Effect of disconnection monitoring of standby optical line by circulating test signals)
In addition, the disaster prevention receiving board periodically transmits a test signal to the regular optical line, and the optical repeater relays the test signal to the downstream side of the regular optical line when the test signal is received from the upward side of the regular optical line. When a preliminary signal is received from the downstream side of the protection optical line, the test signal is relayed to the upstream side of the protection optical line. In order to transmit the test signal to the optical line, the test signal is sent from the disaster prevention receiving panel to the terminating equipment via the optical repeater via the regular optical line, and then from the terminating equipment to the optical repeater again via the standby optical line. By being sent to the disaster prevention receiver board via, it circulates between the normal optical line and the standby optical line, and if the test signal that is circulating is cut off, in addition to disconnection of the normal optical line, the standby Disconnection of the optical line for use can be determined with certainty.

(Effect of disconnection monitoring of standby optical line by return of test signal)
Further, when the optical repeater receives the test signal from the upstream side of the regular optical line, the optical repeater relays the test signal to the downstream side of the regular optical line and also repeats the test signal to the upstream side of the standby optical line. As a result, the test signal circulates between the normal optical line and the standby optical line for each optical repeater unit and each terminating unit. In addition to the disconnection of the optical line for protection, the disconnection of the standby optical line can be determined with certainty.

(Effect of judgment of disconnection of standby optical line by disaster prevention receiver)
When the disaster prevention receiving board does not receive the test signal from the standby optical line within a predetermined waiting time after transmitting the test signal, the disaster prevention receiver determines that the standby optical line is broken, and the optical repeater adjacent to the downstream side. In addition to instructing the transmission of the test signal via the regular optical line, the disconnection of the backup optical line between the adjacent optical repeater on the downstream side was notified, so the disconnection failure occurred in the backup optical line. In this case, the disaster prevention receiver located on the upstream side of the disconnection point instructs another optical repeater located on the downstream side of the disconnection point to transmit a test signal via the regular optical line, Continuous patrol of the test signal bypassing the line continues to monitor disconnection, and at the same time, the disaster prevention receiving panel itself determines the disconnection point of the backup optical line and notifies the disconnection of the backup optical line. To enable a countermeasure to restore a broken spare optical line.

(Effect of disconnection judgment for backup optical line by optical repeater)
Further, if the optical repeater does not receive the test signal from the downstream side of the protection optical line within a predetermined waiting time after transmitting the test signal to the downstream side of the regular optical line, It judges the disconnection of the line, instructs other optical repeaters adjacent to the downstream side or the terminal equipment adjacent to the downstream side to transmit test signals via the regular optical line, and prepares the standby disaster prevention receiver on the upstream side. Transmits a disconnection failure signal indicating disconnection of the backup optical line between the downstream side adjacent optical repeater or disconnection of the backup optical line between the downstream side adjacent terminating equipment via the optical line. Therefore, when a disconnection failure occurs in the backup optical line, the optical repeater located on the upstream side of the disconnection point is normally used by other optical repeaters or termination devices located on the downstream side of the disconnection point. By instructing transmission of the test signal via the optical line, the circulation of the test signal that bypasses the broken standby optical line continues, thereby continuing the disconnection monitoring, and at the same time detecting the disconnection position of the backup optical line. By sending the disconnection failure signal shown to the disaster prevention receiving panel, it is possible to notify the disconnection of the backup optical line and restore the disconnected backup optical line.

(Effect of waiting time)
In addition, the waiting time for judging disconnection of the backup optical line is set so that the time from the terminating device to the disaster prevention receiving panel becomes progressively longer. The waiting time of the optical repeater located on the upstream side of the cable is short, and the closer it gets to the disaster prevention receiver board, the longer the waiting time. When the predetermined waiting time is reached first, it is determined that the normal optical line is broken, and the test signal is transmitted upstream by the normal optical line that bypasses the broken point of the backup optical line. The optical repeater and disaster prevention receiver receive the test signal again from the standby optical line before the time elapsed from the transmission of the test signal reaches the set waiting time. It is possible to prevent a problem that a plurality of optical repeaters and disaster prevention receivers located on the upstream side are repeatedly judged to have a disconnection.

Explanatory diagram showing the outline of tunnel emergency equipment using optical circuits Block diagram showing the functional configuration of the embodiment of the disaster prevention receiving panel and equipment provided in FIG. FIG. 3 is a block diagram showing the functional configuration of the embodiment of the controller provided in FIG. FIG. 2 is a block diagram showing the functional configuration of the embodiment of the optical repeater amplifier provided in FIG. FIG. 2 is a block diagram showing the functional configuration of the embodiment of the terminal device provided in FIG. Explanatory diagram showing transmission and reception of optical signals in a normal state Block diagram showing the normal mode operation of the optical repeater amplifier in the normal state of FIG. FIG. 6 is a block diagram showing the normal mode operation of the terminating device in the normal state of FIG. Explanatory diagram showing transmission and reception of optical signals when disconnection failure occurs in the regular optical line between the disaster prevention receiving panel and the optical repeater amplifier FIG. 9 is a block diagram showing operation in detour mode of an optical repeater amplifier that performs detour relay for the disconnection failure of FIG. An explanatory diagram showing transmission and reception of optical signals when a disconnection failure occurs in a common optical line between optical repeater amplifiers. An explanatory diagram showing the transmission and reception of optical signals when a disconnection failure occurs in the common optical line between the optical repeater amplifier and the terminating equipment. Explanatory diagram showing transmission and reception of optical signals when an optical intensity drop failure is detected by an optical repeater amplifier adjacent to a disaster prevention receiver panel An explanatory diagram showing transmission and reception of optical signals when an optical intensity drop fault is detected in an optical repeater adjacent to the optical repeater. Block diagram showing single-pass mode operation of the optical repeater amplifier due to the light intensity drop fault of FIG. Explanatory diagram showing transmission and reception of optical signals when an optical intensity drop failure is detected in a terminating device adjacent to an optical repeater amplifier. Explanatory drawing showing detour transmission of a test signal when a standby optical line between optical repeater amplifiers is disconnected in disconnection monitoring in which a test signal is circulated from a regular optical line to a standby optical line. Explanatory drawing showing detour transmission of a test signal when the optical line for protection between the optical repeater amplifier and the terminating equipment is disconnected in disconnection monitoring in which the test signal is circulated from the regular optical line to the backup optical line. Explanatory diagram showing detour transmission of test signals when the standby optical line between the disaster prevention receiving panel and the optical repeater amplifier is disconnected in disconnection monitoring in which the test signal is circulated from the regular optical line to the standby optical line. In the disconnection monitoring that circulates the test signal from the normal optical line to the backup optical line for each optical repeater amplifier and each terminating device, the detour transmission of the test signal when the backup optical line between the optical repeater amplifiers is broken is shown. Explanatory diagram

[Overview of Tunnel Emergency Equipment]
FIG. 1 is an explanatory diagram showing an outline of tunnel emergency equipment using an optical line. As shown in FIG. 1, inside the tunnel 10, fire detectors 25 are installed at intervals of 50 meters in the longitudinal direction of the tunnel to detect flames caused by fire. Fire hydrants 24 containing attached hoses are installed at intervals of 50 meters.

In addition, in the tunnel 10, as equipment other than the fire detector 25 and the fire hydrant device 24, a manual reporting device and an emergency telephone are provided for fire reporting, and furthermore, to protect the tunnel frame and the inside of the duct from fire A water spray for sprinkling water for fire extinguishing from a water spray head is installed, but illustration is omitted.

On the other hand, a disaster prevention receiving panel 12 is installed in the monitoring center or the like. 1 is connected via an optical converter 18 to equipment such as a fire detector 25 and a fire hydrant device 24 installed in the tunnel 10 and other emergency equipment.

In addition, optical repeater amplifiers 20 are connected at predetermined transmission distances in the middle of the regular optical line 14-1 and the standby optical line 14-2 to repeat and amplify optical signals. Furthermore, a terminating device 22 is connected to the ends of the regular optical line 14-1 and the standby optical line 14-2.

An optical fiber cable such as FTTH is used for the regular optical line 14-1 and the standby optical line 14-2, and optical wavelength division multiplexing (WDM) using IP packets, for example, is performed.

A power supply line 16 is drawn into the tunnel from the disaster prevention receiving panel 12, and an optical converter 18, an optical repeater amplifier 20, a terminal device 22, a fire detector 25, and a fire hydrant device 24 installed in the tunnel. Power is supplied to equipment.

In addition, for the disaster prevention receiving panel 12, fire pump equipment 26, duct cooling pump equipment 27, ventilation equipment 28, alarm display board equipment 29, radio rebroadcast equipment 30, television monitoring equipment 31, lighting equipment 32 and IG Slave station equipment 33 and the like are provided, and except for connecting the IG slave station equipment 33 with a data transmission line, other equipment is individually connected to the disaster prevention receiving panel 12 with a P-type signal line.

Here, the ventilation equipment 28 is equipment that gives energy to the air in the tunnel by means of a high blowing wind speed generated by the operation of a jet fan installed on the ceiling side of the tunnel to generate a ventilation flow in the longitudinal direction of the tunnel.

The alarm display board facility 29 is a facility for notifying users in the tunnel of an abnormality in the tunnel by displaying it on an electric display board. The radio rebroadcast facility 30 is a facility for enabling drivers and the like to receive information from road administrators in tunnels. The television monitoring equipment 31 is equipment for checking the scale and position of the fire, operating the water spray equipment, and grasping the situation inside the tunnel when conducting evacuation guidance.

The lighting equipment 32 is equipment for driving and managing the lighting equipment in the tunnel. Further, the IG slave station equipment 33 is a communication equipment that connects the disaster prevention receiving panel 12 and a remote monitoring control equipment 35, which is a higher-level equipment provided outside, via a network 34 .

[Equipment functional configuration]
FIG. 2 is a block diagram showing an embodiment of the disaster prevention receiving panel and equipment provided in FIG. 1 in terms of functional configuration.

(Disaster prevention receiver)
As shown in FIG. 2, the disaster prevention receiver panel 12 includes a panel control section 46, which is a function realized by executing a program, for example. using a computer circuit or the like with

Two systems of a transmission unit 48 and an optical transmission/reception unit 50 are provided for the board control unit 46 . A standby optical line 14-2 is drawn into the tunnel from the tunnel, and an optical converter 18 provided corresponding to, for example, a fire detector 25 and a fire hydrant device 24 is connected to the branched optical line via an optical distributor 15. It is

It should be noted that the two systems of the transmission unit 48 and the optical transmission/reception unit 50 for the board control unit 46 may be a plurality of sets as required. For example, when the disaster prevention receiver board 12 monitors the disaster prevention equipment of the up tunnel and the down tunnel, at least two sets of the two-system transmission unit 48 and the optical transmission/reception unit 50 for the board control unit 46 are provided.

The panel control unit 46 communicates with a display unit 52 equipped with a liquid crystal display, a printer, etc., an operation unit 54 equipped with various switches, etc., an alarm unit 56 equipped with a speaker, an alarm indicator lamp, etc., and external monitoring equipment. A modem 58 for connecting the IG slave station equipment 40 is provided, and furthermore, the fire pump equipment 26, the cooling pump equipment 27, the ventilation equipment 28, the alarm display board equipment 29, the radio rebroadcast equipment 30, and the television monitoring equipment shown in FIG. IO section 60 to which 31 and lighting equipment 32 are connected is provided.

The transmission unit 48 transmits and receives packet signals (electrical signals) according to a predetermined serial communication protocol.

The optical transmission/reception unit 50 converts the packet signal from the transmission unit 48 into an optical signal of a predetermined downstream wavelength band and transmits the optical signal to the optical line, and converts the optical signal of a predetermined upstream wavelength band received from the optical line into a packet signal. (Electrical signal) and output to the transmission unit.

For example, the optical transmitter/receiver 50 includes an electrical/optical converter (E/O converter) having a laser diode that converts an electrical signal into an optical signal, and an optical/optical converter having a photodiode that converts an optical signal into an electrical signal. It comprises an electrical converter (O/E converter) and a WDM filter that separates optical signals in the upstream wavelength band from the optical line and combines and sends optical signals in the downstream wavelength band to the optical line.

In this embodiment, the transmission unit 48 and the optical transmission/reception unit 50 perform CWDM (coarse WDM) transmission known as optical wavelength division multiplexing communication with wide wavelength intervals, thereby achieving a tunnel length exceeding 10 kilometers. However, we can respond appropriately.

The board control unit 46 instructs the transmission unit 48 corresponding to the common optical line 14-1 to control the transmission and reception of packet signals to and from equipment installed in the tunnel via the optical transmission unit 50. FIG.

Here, the equipment installed in the tunnel includes detection system equipment such as a fire detector 25 that transmits detection signals and switch signals to the panel control unit 46, a transmitter 76, a fire hydrant switch 80, and a panel control unit. It can be divided into control system equipment such as a red indicator lamp 74 and a response lamp 78 controlled by the unit 46 .

For this reason, the panel control unit 46 includes a polling command that sequentially designates the unique IP addresses assigned to the equipment for the fire detector 25, the transmitter 76, and the fire hydrant switch 80, which are equipment for the detection system. Control is performed to repeatedly transmit call packet signals, and when detection system equipment receives a call packet signal that matches its own IP address, it sends a response packet signal containing its own status information such as fire detection and switch-on. Reply.

In addition, the panel control unit 46, when control is required for the red indicator lamp 74 and the response lamp 78, which are equipment of the control system, is a control packet signal containing a control command designating a unique IP address. When the equipment of the detection system receives a call packet signal that matches its own IP address, it controls the lighting and blinking of the indicator lamp.

Note that the panel control unit 46 also repeatedly transmits a call packet signal including a polling command sequentially specifying an IP address to the control-system equipment as well as the detection-system equipment, and sends a response packet indicating the status of each device. A signal may be returned.

Specifically, the control by the board control unit 46 is as follows. When the panel control unit 46 detects a fire by receiving a response packet signal (fire signal) containing fire information from the fire detector 25, the alarm unit 56 outputs a fire alarm and outputs a fire alarm to other equipment via the IO unit 60. perform control to instruct interlocking.

In addition, when the panel control unit 46 detects a fire by receiving a response packet signal (fire notification signal) containing fire notification information by operating the transmitter 76 provided in the fire hydrant device 24, the alarm unit 56 issues a fire alarm. is output and the IP address of the response lamp 78 and the red indicator light 74 provided in the fire hydrant device 24 where the transmitter 76 is operated is specified. Control is performed to transmit a control packet signal including the received control command, to turn on the response lamp 78 and to blink the red indicator lamp 74 .

On the other hand, the board control unit 46 instructs the transmission unit 48 to perform control to transmit the test optical signal to the regular optical line 14-1 and the standby optical line 14-2 via the optical transmission/reception unit 50 at predetermined intervals. When the terminating device 22 normally receives the test optical signal, it sends back the test response optical signal. I have verified that it is working.

(Functional configuration on equipment side)
As shown in FIG. 2, the optical converter 18 is provided on the side of the equipment where the fire detector 25 and the fire hydrant device 24 are provided. The optical converter 18 has an optical transmission/reception unit 62 corresponding to the common optical line 14-1, and the transmission/reception side of the electric signal is connected to a gateway 66 functioning as a signal conversion unit.

The optical transmitter/receiver 62 is the same as the optical transmitter/receiver 50 provided on the disaster prevention receiver panel 12, and includes an electrical/optical converter (E/O converter), an optical/electrical converter (O/E converter), and a WDM filter. converts an optical signal in the downstream wavelength band from the optical line into an electrical signal and outputs it to the gateway 66, and converts the electrical signal from the gateway 66 into an optical signal in the upstream wavelength band and outputs it to the optical line. .

The gateway 66 performs protocol conversion between the IP protocol on the optical line side and the TCP protocol on the equipment side, such as Ethernet (registered trademark), which is a predetermined LAN protocol. Although the gateway 66 has the connection function of all seven layers in the OSI basic reference model, the gateway 66 may be replaced with a router. The router has a connection function of layers 1 to 3 of the OSI basic reference model, and likewise enables protocol conversion between the IP protocol on the optical line side and the predetermined LAN protocol on the equipment side.

A LAN line 68 is connected to the equipment side of the gateway 66, and the fire detector 25 is directly connected to the LAN line 68. A red indicator lamp 74 and a response lamp 78, which are control system equipment, are used as controllers. A transmitter 76 and a fire hydrant switch 80 serving as detection system equipment are connected to the LAN line 68 via another controller 72 .

The transmission between the gateway 66 provided in the optical converter 18 and the controllers 70 and 72 provided in the fire detector 25 and the fire hydrant system is used in the R-type fire alarm system in addition to the LAN protocol transmission. It is also good as a fire transmission protocol.

In the case of the fire transmission protocol, the downstream signal from the transmitter of the gateway 66 to the transmitters of the fire detector 25 and the controllers 70, 72 is a voltage mode transmission, which is a voltage pulse that changes the voltage of the transmission line within a predetermined voltage range. transmitted as On the other hand, the upstream signal from the transmitters of the fire detector 25 and the controllers 70 and 72 to the transmitter of the gateway 66 is transmitted in the current mode. An upstream signal is transmitted as a so-called current pulse train.

FIG. 3 is a block diagram showing the functional configuration of an embodiment of a controller provided on the side of the fire hydrant device in FIG. 3(B) indicates a controller used for the equipment of the detection system.

The controller 70 used in the control-system equipment shown in FIG. The terminal control unit 82 uses a computer circuit or the like having a CPU, memory, various input/output ports, and the like.

A unique IP address is set in the LAN transmission unit 84, and when the address of the packet signal received via the LAN line 68 matches the own address, the terminal control unit 82 transmits the control command set in the packet signal. is output to the drive circuit 86 to control the blinking of the red indicator lamp 74 connected as equipment, for example.

In addition, the drive circuit unit 86 keeps the red indicator lamp 74 in a lighting state in a normal state. Also, the controller 70 connected to the response lamp 78 shown in FIG. 2 is the same as that shown in FIG. 3(A).

A controller 72 used in the detection system of FIG. A unique IP address is set in the LAN transmission unit 84 . For example, a transmitter 76 is connected as equipment to the input circuit section 88. When the switch of the transmitter 76 is turned on by operating the push button, the input circuit section 88 detects the switch-on and outputs a fire notification signal. .

When the terminal control unit 82 detects the fire notification signal from the input circuit unit 88, it instructs the LAN transmission unit 84 to generate and transmit a packet signal in which the IP address of the disaster prevention receiver 12 and the fire notification information are set. I do.

It is desirable that the switch used for the transmitter 76 be a non-lock type switch. By using a non-locking switch for the transmitter 76, recovery operation after switch operation is unnecessary.

Also, the controller 72 connected to the fire hydrant switch 80 shown in FIG. 2 is the same as that shown in FIG. 3(B). In addition, the fire hydrant switch 80 is a switch that is turned on when the fire hydrant valve opening/closing lever provided in the fire hydrant device 24 is operated to the open position, and a packet signal including a pump activation command for the fire pump equipment is sent to the disaster prevention receiving panel 12. be done. Furthermore, the fire hydrant switch 80 is connected in parallel with a fire pump starting switch (not shown) provided in the fire hydrant device 24 and used by the fire brigade.

Further, since the fire detector 25 of FIG. 2 has a built-in function of a LAN transmission section, it is not necessary to attach a controller externally. Also, in FIG. 2, the controllers 70 and 72 are externally attached to the equipment, but the equipment may be integrated with both.

The controllers 70 and 72 shown in FIG. 3 are powered by the power line 16 from the disaster prevention receiving panel 12 as shown in FIG. A battery power supply is provided for the controller 72 of the facility equipment shown in FIG. is performed, the power supply is switched to the power supply from the disaster prevention receiving panel 12 to operate the controller 72, thereby reducing the power consumption on the equipment side.

In addition, the terminal control unit 82 having the CPU of the controllers 70 and 72 shown in FIGS. The sleep mode may be released by wakeup and the device may be operated in the normal mode.

(Configuration of optical repeater amplifier)
FIG. 4 is a block diagram showing the functional configuration of an embodiment of the optical repeater amplifier provided in FIG.

As shown in FIG. 4, the optical repeater amplifier 20 comprises a regular repeater amplifier 90, a backup repeater amplifier 92, a detour repeater amplifier 94, a repeater amplifier controller 96, and a gateway 98. FIG. Signal line connections between the relay amplification control section 96 and the gateway 98, the regular relay amplification section 90, the standby relay amplification section 92, and the standby relay amplification section 92 are omitted.

The common repeater amplifier 90 repeats and amplifies the optical signal between the upstream side and the downstream side of the common optical line 14-1. A WDM filter 100, an optical/electrical converter (O/E converter) 102, an amplifier 104, an electric/optical converter (E/O converter) 106, and a WDM filter are used for relay amplification of a downstream signal by the common relay amplifier 90. 108.

Further, the relay amplification of the upstream signal by the common relay amplifier 90 includes a WDM filter 108, an optical/electrical converter (O/E converter) 110, an amplifier 112, a switch 114, an electric/optical converter (E/O converter). 116 and the WDM filter 100 .

The backup repeater amplifier 92 repeats and amplifies the optical signal between the upstream side and the downstream side of the backup optical line 14-2. The relay amplification of the downstream signal by the standby relay amplifier 92 includes a WDM filter 118, an optical/electrical converter (O/E converter) 120, an amplifier 122, a switch 124, an electric/optical converter (E/O converter). ) 126 and WDM filter 128 .

Further, the relay amplification of the upstream signal by the standby relay amplifier 92 includes a WDM filter 128, an optical/electrical converter (O/E converter) 130, an amplifier 132, an electric/optical converter (E/O converter) 134 and the WDM filter 118 .

A switch 114 provided in the normal relay amplifier section 90 selectively connects the output of the amplifier 112 to its own electrical/optical converter 116 or the electrical/optical converter 134 of the backup relay amplifier section 92 .

A switch 124 provided in the backup repeater amplifier 92 selectively connects the output of the amplifier 122 to its own electrical/optical converter 126 or the electrical/optical converter 106 of the regular repeater amplifier 90 .

The detour relay amplifier 94 relays and amplifies the optical signal between the regular optical line 14-1 and the standby optical line 14-2. The optical signal from the regular optical line 14-1 to the standby optical line 14-2 by the bypass relay amplifier 94 passes through a WDM filter 136, an optical/electrical converter (O/E converter) 138, an amplifier 114, an electric/ It is relay-amplified by a system composed of an optical converter (E/O converter) 142 and a WDM filter 144 .

Further, the optical signal from the backup optical line 14-2 to the regular optical line 14-1 by the detouring repeater amplifier 94 is passed through a WDM filter 144, an optical/electrical converter (O/E converter) 146, an amplifier 148, It is relay-amplified by a system composed of an electrical/optical converter (E/O converter) 150 and a WDM filter 136 .

(Control of optical repeater amplifier)
The repeater amplification control unit 96 of the optical repeater amplifier 20 is a function realized by executing a program, for example, and uses a computer circuit having a CPU, a memory, various input/output ports, etc. as hardware.

The repeater amplifier control unit 96 operates the optical repeater amplifier 20 in the normal mode in a normal state, and operates the optical repeater amplifier 20 in the detour mode when a disconnection failure of the regular optical line 14-1 is detected. When a disconnection trouble signal is received from the optical repeater amplifier, the optical repeater amplifier 20 is operated in the dual path mode.

The relay amplification control unit 96 captures the test optical signal periodically transmitted from the disaster prevention receiver 12 to the common optical line 14-1 as a downstream signal from the output of the optical/electrical converter 102, for example, as an electrical signal, and converts the test optical signal is stopped for a predetermined period of time, or if reception is not possible for a predetermined number of times in succession, disconnection failure of the regular optical line 14-1 on the upstream side is detected.

When the relay amplification control unit 96 detects a disconnection failure in the upstream normal optical line 14-1, it instructs the gateway 98 to transmit the backup light to the disaster prevention receiving panel 12 or other optical relay amplifier 20 located on the upstream side. A disconnection fault signal is transmitted through the line 14-2, and an optical signal is transmitted and received through the optical line for protection 14-2.

Further, the relay amplifier unit 96, which has detected the disconnection failure of the regular optical line 14-1 on the upstream side,
As the detour mode operation, the optical signal is detour-relayed between the backup optical line 14-2 on the upstream side and the normal optical line 14-1 on the upstream side via the detour-use relay amplifier 94, and the normal relay amplification is performed. By switching the switches 114 and 124 of the unit 90 and the standby relay amplifier unit 92 to the b side, optical signals are transmitted between the upstream standby optical line 14-1 and the downstream normal optical line 14-1. control to relay by detour.

Further, when the repeater amplifier 96 receives a disconnection failure signal from another optical repeater amplifier 20 adjacent on the downstream side, the repeater amplifier 96 operates in the dual path mode as the detour repeater amplifier 94, the regular repeater amplifier 90, and the standby repeater amplifier 90. By the operation of the relay amplifier 92, the optical signal is relay-amplified between the upstream regular optical line 14-1 and the downstream regular optical line 14-1, and the optical signal is amplified between the regular optical line 14-1 on the upstream side and the regular optical line 14-1 on the downstream side. control for relaying and amplifying the optical signal with the standby optical line 14-2 on the side.

(Functional configuration of terminating device)
FIG. 5 is a block diagram showing the functional configuration of an embodiment of the termination device provided in FIG. As shown in FIG. 5, the terminal device 22 is provided with a terminal controller 152 and a gateway 154 .

In order to transmit an optical signal from the regular optical line 14-1 to the standby optical line 14-2, a WDM filter 156, an optical/electrical converter (O/E converter) 158, an amplifier 160, an electric/optical converter A chain consisting of (E/O converter) 162 and WDM filter 164 is provided.

Furthermore, a WDM filter 164, an optical/electrical converter (O/E converter) 166, an amplifier 168, an electric/optical converter for transmitting an optical signal from the standby optical line 14-2 to the regular optical line 14-1. A chain consisting of (E/O converter) 170 and WDM filter 156 is provided.

The termination control unit 152 is a function realized by executing a program, for example, and uses a computer circuit or the like having a CPU, a memory, various input/output ports, etc. as hardware.

The termination control unit 152 operates the termination device 22 in the normal mode in a normal state, and operates the termination device 22 in the detour mode when a disconnection failure of the regular optical line 14-1 is detected.

In the normal mode operation of the termination control unit 152, by stopping the operation of the amplifiers 160 and 168, optical signals are independently transmitted and received by the regular optical line 14-1 and the standby optical line 14-2, thereby preventing disasters. Upon receiving the test optical signal periodically transmitted from the receiving board 12, control is performed to transmit the test response optical signal.

The termination control unit 152 captures the test optical signal periodically transmitted as a downstream signal from the disaster prevention receiving board 12 to the common optical line 14-1 as an electrical signal from the output of the optical/electrical converter 158, for example, and the test optical signal is A disconnection failure of the regular optical line 14-1 is detected when the line is stopped continuously for a predetermined time or when reception is not possible for a predetermined number of times.

When the termination control unit 152 detects a disconnection fault in the regular optical line 14-1, it instructs the gateway 154 to send a disconnection fault signal to the upstream optical repeater amplifier 20 via the backup optical line 14-2. is transmitted, and an optical signal is transmitted and received through the standby optical line 14-2.

Termination control unit 152, which has detected a disconnection failure in regular optical line 14-1, activates amplifiers 160 and 168 in a detour mode, and switches between standby optical line 14-2 and regular optical line 14-1. performs control to detour and relay the optical signal.

[Transmission control of tunnel emergency equipment]
(Transmission control under normal conditions)
FIG. 6 is an explanatory diagram showing transmission and reception of optical signals in a normal state, and transmission of optical signals is indicated by dashed arrows. 7 is a block diagram showing the normal mode operation of the optical repeater amplifier in the normal state of FIG. 6, and FIG. 8 is a block diagram showing the operation of the termination device in the normal state of FIG.

As shown in FIG. 6, in a normal state, the disaster prevention receiving panel 12 transmits and receives optical signals to and from the regular optical line 14-1, thereby transmitting and receiving optical signals to and from a plurality of optical converters 18 connected to the regular optical line 14-1. The optical repeater amplifiers 20-1 and 20-2 bi-directionally repeat and amplify the optical signal of the common optical line 14-1, and the terminal device 22 periodically receives the test optical signal transmitted to the and transmits the test response optical signal. Note that the optical repeater amplifiers 20-1 and 20-2 may be referred to as the optical repeater amplifier 20 when there is no need to distinguish between them in the following description.

In the normal state of FIG. 6, the optical repeater amplifier 20 operates in the normal mode shown in FIG. In normal mode operation of the optical repeater amplifier 20, as shown in FIG. In the amplifying section 94, the optical/electrical converters 138, 146, the amplifiers 140, 148, and the electrical/optical converters 138, 150 are in a stopped state, and the bypass relay function is stopped.

Therefore, in the normal mode of the optical repeater amplifier 20, the operation of the regular repeater amplifier 90 and the standby repeater amplifier 92 individually performs bidirectional repeater amplification of the optical signal.

In the state of FIG. 6, the termination device 22 operates in the normal mode, as shown in FIG. 2 independently performs transmission and reception of optical signals, and upon receiving a test optical signal periodically transmitted from the disaster prevention receiving board 12, performs control to transmit a test response optical signal.

(Disconnection failure in the regular optical line between the disaster prevention receiver and the optical relay amplifier)
FIG. 9 is an explanatory diagram showing the transmission and reception of optical signals in the event of a disconnection failure in the common optical line between the disaster prevention receiver panel and the optical repeater amplifier. FIG. 4 is a block diagram illustrating bypass mode operation of the amplifier;

As shown in FIG. 9, when a disconnection fault 180 occurs in the regular optical line 14-1 between the disaster prevention receiving panel 12 and the optical repeater amplifier 20-1, the disconnection fault occurs in the optical repeater amplifier 20-1 located on the downstream side. is detected, and a disconnection failure signal is transmitted to the disaster prevention receiving panel 12 via the standby optical line 14-2.

Upon receiving the disconnection failure signal, the disaster prevention receiving board 12 starts transmitting and receiving the same optical signal to and from the backup optical line 14-2 in addition to the transmission and reception of the optical signal to and from the regular optical line 14-1.

The optical repeater amplifier 20-1 that has detected the disconnection fault operates in the detour mode. As shown in FIG. 10, the optical repeater amplifier 20-1 operates in the detour mode. The electric converter 102, the amplifier 104 and the electric/optical converter 116 are stopped as indicated by the dashed lines, and the electric/optical converter 126, the optical/electrical converter 130 and the amplifier 132 of the backup repeater amplifier 92 are stopped. is stopped as indicated by the dashed line.

For this reason, the optical repeater amplifier 20-1 operating in the detour mode, as shown in FIG. A detour relay for sending and receiving signals is performed. In addition, the optical repeater amplifier 20 that has detected the disconnection failure performs detour relay for transmitting and receiving optical signals between the standby optical line 14-2 and the regular optical line 14-1 on the downstream side. Other than that, the optical repeater amplifier 20 and the termination device 22 are operating in normal mode.

For this reason, the photodetector 18 connected to the normal optical line 14-1 on the upstream side of the location where the disconnection fault 180 occurs transmits and receives an optical signal to and from the disaster prevention receiving board 12 via the normal optical line 14-1, The photodetector 18 connected to the regular optical line 14-1 on the downstream side where the disconnection fault 180 occurs is connected to the backup optical line 14-2 via the optical repeater amplifier 20-1 operating in the detour mode. Further, the photodetector 18 connected to the regular optical line 14-1 on the downstream side of the optical repeater amplifier 20 that has detected the disconnection failure detects the optical signal operating in the detour mode. Optical signals are transmitted and received to and from the standby optical line 14-2 via the repeater amplifier 20-1, and even if a disconnection failure 180 occurs, the disaster prevention receiver board 12 is connected to the regular optical line 14-1. can transmit and receive optical signals to and from the optical converter 18 of the .

(Disconnection failure in regular optical line between optical repeater amplifiers)
FIG. 11 is an explanatory diagram showing transmission and reception of optical signals when a disconnection failure occurs in a common optical line between optical repeater amplifiers.

As shown in FIG. 11, when a disconnection fault 180 occurs in the regular optical line 14-1 between the optical repeater amplifiers 20-1 and 20-2, the optical repeater located downstream of the location where the disconnection fault 180 occurs 20-2 detects the disconnection fault, transmits a disconnection fault signal to the optical repeater amplifier 20-1 via the standby optical line 14-2, and operates in the detour mode.

The optical repeater amplifier 20-1 located on the upstream side of the location where the disconnection fault 180 occurs operates in dual-path mode upon receiving the disconnection fault signal, and the upstream normal optical line 14-1 and the downstream normal optical line 14 are operated. -1, and repeats and amplifies the optical signal between the normal optical line 14-1 on the upstream side and the standby optical line 14-2 on the downstream side.

In the dual-path mode operation of the optical repeater amplifier 20-1, all of the regular repeater amplifier 90, the backup repeater amplifier 92, and the detour repeater amplifier 94 of the optical repeater amplifier 20 shown in FIG. mode.

The detour mode operation of the optical repeater amplifier 20-2 that has detected the disconnection fault 180 is the same as shown in FIGS.

For this reason, the photodetector 18 connected to the regular optical line 14-1 on the upstream side of the location where the disconnection fault 180 has occurred is connected to the disaster prevention receiver panel 12 via the optical repeater amplifier 20-1 operating in the dual path mode. , and the photodetector 18 connected to the common optical line 14-1 on the downstream side of the location where the disconnection fault 180 occurs via the optical repeater amplifier 20-2 operating in the detour mode. The photodetector 18, which transmits and receives optical signals to and from the backup optical line 14-2 and is connected to the regular optical line 14-1 on the downstream side of the optical repeater amplifier 20 that has detected the disconnection failure, is detoured. An optical signal is transmitted/received to/from the standby optical line 14-2 via the optical repeater amplifier 20 operating in the mode, and even if a disconnection fault 180 occurs between the optical repeater amplifiers 20-1 and 20-2, , the disaster prevention receiving board 12 can transmit and receive optical signals to and from all the optical converters 18 connected to the common optical line 14-1.

(Disconnection failure in regular optical line between optical repeater amplifier and terminating equipment)
FIG. 12 is an explanatory diagram showing transmission and reception of optical signals when a disconnection failure occurs in a regular optical line between an optical repeater amplifier and a terminating device.

As shown in FIG. 12, when a disconnection fault 180 occurs in the common optical line 14-1 between the optical repeater amplifier 20-2 and the termination device 22, the termination device 22 detects the disconnection fault 180 and outputs a disconnection fault signal. It is transmitted to the optical repeater amplifier 20-2 via the standby optical line 14-2 and operates in the detour mode.

The optical repeater amplifier 20-2 located on the upstream side of the location where the disconnection fault 180 occurs operates in the dual-path mode upon receiving the disconnection fault signal, and the upstream normal optical line 14-1 and the downstream normal optical line 14- are operated. 1, and relays and amplifies the optical signal between the normal optical line 14-1 on the upstream side and the standby optical line 14-2 on the downstream side.

The detour mode operation of the termination device 22 is a mode in which all of the optical/electrical converters 158, 166, the amplifiers 160, 168, and the electrical/optical converters 162, 170 shown in FIG. 5 are in operation.

For this reason, the photodetector 18 connected to the regular optical line 14-1 on the upstream side of the location where the disconnection fault 180 has occurred is connected to the disaster prevention receiver panel 12 via the optical repeater amplifier 20-2 operating in the dual path mode. and the photodetector 18 connected to the common optical line 14-1 on the downstream side of the location where the disconnection fault 180 occurs via the terminal device 22 operating in the detour mode. Even if an optical signal is transmitted and received to and from the standby optical line 14-2, and a disconnection failure 180 occurs between the optical repeater amplifier 20-2 and the terminating device 22, the disaster prevention receiving board 12 will be connected to the regular optical line 14-1. Optical signals can be sent and received to and from all the optical converters 18 connected.

[Response to light intensity drop failure of tunnel emergency equipment]
In the tunnel emergency equipment using optical transmission shown in FIG. Due to light leakage caused by poor connection of the optical connector, etc., the intensity of the received optical signal may be reduced, causing a light intensity drop failure that makes it impossible to transmit and receive the optical signal. control is required.

(An optical repeater amplifier adjacent to the disaster prevention receiving panel detects an optical intensity drop failure.)
FIG. 13 is an explanatory diagram showing transmission and reception of optical signals when an optical intensity drop failure is detected by an optical repeater amplifier adjacent to a disaster prevention receiving panel.

As shown in FIG. 13, when the level of the test optical signal periodically received from the regular optical line 14-1 by the optical repeater amplifier 20-1 adjacent to the disaster prevention receiver panel 12 falls below a predetermined threshold, the optical intensity A degrading fault 190 is detected.

The optical repeater amplifier 20-1 that has detected the optical intensity drop fault 190 transmits the optical intensity drop fault signal to the disaster prevention receiving board 12 via the standby optical line 14-2, and receives the optical intensity drop fault signal for disaster prevention reception. The board 12 stops transmission and reception of optical signals through the regular optical line 14-1, and causes transmission and reception of optical signals through the standby optical line 14-2.

In addition, the optical repeater amplifier 20-1, which has detected the optical intensity drop fault 190, enters the detour mode operation state, and transmits and receives optical signals between the backup optical line 14-2 and the upstream regular optical line 14-1. Also, a detour relay is performed to transmit and receive optical signals between the backup optical line 14-2 on the upstream side and the regular optical line 14-1 on the downstream side. Other than that, the optical repeater amplifier 20-2 and the termination device 22 are operating in normal mode.

For this reason, the photodetector 18 connected to the regular optical line 14-1 on the upstream side of the optical repeater amplifier 20-1 that detected the optical intensity drop fault 190 operates in the detour mode. and transmits and receives optical signals to and from the standby optical line 14-2 via the optical relay amplifier 20-1, and is connected to the regular optical line 14-1 on the downstream side of the optical repeater amplifier 20-1 that has detected the optical intensity drop failure. The photodetector 18 transmits and receives an optical signal to and from the standby optical line 14-2 via the optical repeater amplifier 20-1 operating in the detour mode. The board 12 can transmit and receive optical signals to and from all the optical converters 18 connected to the common optical line 14-1.

In addition, since the transmission and reception of optical signals to and from the regular optical line 14-1 of the disaster prevention receiver panel 12 is stopped, collision of optical signals due to detour relaying of the optical repeater amplifier 20-1 does not occur.

(Optical repeater amplifier adjacent to optical repeater amplifier detects optical intensity drop fault)
FIG. 14 is an explanatory diagram showing transmission and reception of optical signals when an optical intensity drop fault is detected in an optical repeater adjacent to the optical repeater.

As shown in FIG. 14, when the optical repeater amplifier 20-2 adjacent to the downstream side of the optical repeater amplifier 20-1 detects an optical signal intensity drop fault 190 of the optical signal from the common optical line 14-1, the optical intensity drops. The optical repeater amplifier 20-2 that has detected the failure 190 transmits an optical intensity drop failure signal to the adjacent optical repeater amplifier 20-1 on the upstream side via the standby optical line 14-2, and transmits the optical intensity drop failure signal. The optical repeater amplifier 20-1 having received the signal operates in the single-path mode, stops transmitting/receiving optical signals to/from the regular optical line 14-1 on the downstream side, and connects the regular optical line 14-1 on the upstream side to the downstream side. An optical signal is transmitted and received between the standby optical lines 14-2.

FIG. 15 is a block diagram showing the operation of the optical repeater amplifier in FIG. 14 in a single pass mode. As shown in FIG. 15, in the single-pass mode operation of the optical repeater amplifier 20, the optical/electrical converters 102, 110, the amplifiers 104, 112, and the electrical/optical converters 106, 116 provided in the common repeater amplifier 90 By stopping the operation of , transmission and reception of optical signals to and from the regular optical line 14-1 on the downstream side is stopped, and the detour repeater amplifier 94 and the spare repeater amplifier 92 are operating.

Referring to FIG. 14 again, the optical repeater amplifier 20-2 that has detected the optical intensity drop failure 190 enters the detour mode operation state, and the backup optical line 14-2 and the upstream regular optical line 14-1 are connected. Also, a detour relay is performed for transmitting and receiving optical signals between the backup optical line 14-2 on the upstream side and the regular optical line 14-1 on the downstream side. Termination device 22 is operating in normal mode.

For this reason, the photodetector 18 connected to the up-side regular optical line 14-1 of the optical repeater amplifier 20-2 that detected the optical intensity drop fault 190 detects the optical repeater amplifier 20-2 operating in the single-path mode. In addition to the relay amplification of the optical signal between the uplink regular optical line 14-1 and the downlink standby optical line 14-2 according to 1, through the optical repeater amplifier 20-2 operating in the detour mode. An optical detector that transmits and receives optical signals to and from the standby optical line 14-2 and is connected to the regular optical line 14-1 on the downstream side of the optical repeater amplifier 20-2 that has detected the optical intensity drop fault 190. The receiver 18 transmits and receives optical signals to and from the standby optical line 14-2 via the optical repeater amplifier 20-2 operating in the detour mode. can transmit and receive optical signals to and from all optical converters 18 connected to the common optical line 14-1.

In addition, since the optical repeater amplifier 20-1 operating in the single bus mode has stopped transmission and reception of optical signals to and from the regular optical line 14-1 on the upstream side of the optical repeater amplifier 20-2, the optical repeater amplifier 20 There is no optical signal collision due to the -2 detour relay.

(Detection of light intensity drop failure at the end device)
FIG. 16 is an explanatory diagram showing transmission and reception of an optical signal when an optical intensity drop failure is detected in a terminal device.

As shown in FIG. 16, when the termination device 22 detects the optical intensity drop failure 190 of the optical signal from the common optical line 14-1, the termination device 22 that detected the optical intensity drop failure 190 is adjacent to the upstream side. The optical repeater amplifier 20-2 transmits an optical intensity drop failure signal to the optical repeater amplifier 20-2 via the standby optical line 14-2, and receives the optical intensity drop failure signal. optical signal transmission/reception with the regular optical line 14-1 on the side is stopped, and optical signals are transmitted/received between the regular optical line 14-1 on the upstream side and the standby optical line 14-2 on the downstream side.

The terminating device 22 that has detected the optical intensity drop failure 190 operates in the detour mode, and performs detour relay for transmitting and receiving optical signals between the backup optical line 14-2 and the regular optical line 14-1.

For this reason, the photodetector 18 connected to the regular optical line 14-1 on the upstream side of the termination device 22 that detected the optical intensity drop fault 190 is spared by the optical repeater amplifier 20-2 operating in the single-path mode. The optical signal relayed to the optical line 14-2 is detoured to the common optical line 14-1 by the detour mode operation of the terminal device 22. The disaster prevention receiving board 12 can transmit and receive optical signals to and from all the optical converters 18 connected to the common optical line 14-1.

Further, since the transmission and reception of optical signals to and from the normal optical line 14-1 on the upstream side of the terminal equipment 22 is stopped by the operation of the optical repeater amplifier 20-2 in the single-path mode, the optical signal by the detour relay of the terminal equipment 22 is stopped. no conflict with

[Disconnection monitoring of standby optical line]
FIG. 17 is an explanatory diagram showing detour transmission of a test signal when a standby optical line between optical repeater amplifiers is disconnected in disconnection monitoring in which a test signal is circulated from a regular optical line to a backup optical line.

(Disconnection monitoring control under normal conditions)
In the embodiment of FIG. 17, in the normal state, disconnection of the regular optical line 14-1 and the standby optical line 14-2 is monitored by circulating test signals. Therefore, the board control section 46 of the disaster prevention receiving board 12 shown in FIG. 2 periodically transmits a test signal for monitoring disconnection to the common optical line 14-1.

4 relays the test signal to the downstream side of the regular optical line 14-1 when the test signal is received from the upstream side of the regular optical line 14-1. When a test signal is received from the downstream side of the protection optical line 14-2, the test signal is relayed to the upstream side of the protection optical line 14-2.

Furthermore, the termination controller 152 of the termination device 22 shown in FIG. 5 transmits the test signal to the protection optical line 14-2 when the test signal is received from the regular optical line 14-1.

Further, if the test signal is not received from the downstream side of the protection optical line 14-2 within a predetermined waiting time after transmission of the test signal, the relay control unit 96 of the optical repeater amplifier 20 determines whether the protection optical line 14-2 , instructs another optical repeater amplifier 20 or terminating device 22 adjacent on the downstream side to transmit a test signal via the normal optical line 14-1, and sends the emergency optical line 14 to the disaster prevention receiving panel 12. -1, a disconnection failure signal indicating disconnection of the backup optical line 14-2 between the adjacent optical repeater amplifier or disconnection of the backup optical line 14-2 between the adjacent terminating equipment 22. Control to send and notify.

Further, the board control unit 46 of the disaster prevention receiving board 12, if the test signal is not received from the downstream side of the standby optical line 14-2 within a predetermined waiting time from the transmission of the test signal, the standby optical line 14-2 , and instructs the optical repeater amplifier 20 adjacent on the downstream side to transmit a test signal via the common optical line 14-1, and the standby between the disaster prevention receiving panel 12 and the adjacent optical repeater amplifier 20. Control is performed to report disconnection of the optical line 14-2.

Here, Tw1 is the waiting time for judging disconnection of the standby optical line 14-2 by the disaster prevention receiving board 12, and waiting time for judging the disconnection of the standby optical line 14-2 by the optical repeater amplifiers 20-1 and 20-2. are Tw2 and Tw3.
Tw1 > Tw2 > Tw3
relationship is set.

In the following description, the control functions of the board control section 46 of the disaster prevention receiver panel 12, the relay amplification control section 96 of the optical relay amplifier 20, and the termination control section 152 of the terminal device 22 are the same as those of the disaster prevention receiver panel 12 and the optical relay amplifier 20. and the control function of the terminal device 22 .

(Disconnection failure of standby optical line between optical repeater amplifiers)
As shown in FIG. 17, when a disconnection failure 200 occurs in the standby optical line 14-2 between the optical repeater amplifier 20-1 and the optical repeater amplifier 20-2, the optical repeater located upstream of the disconnection point 20-1 receives the test signal from the downstream side of the protection optical line 14-2 within a predetermined waiting time Tw2 after transmission of the test signal to the regular use optical line 14-1. , instructs another optical repeater amplifier 20-2 adjacent on the downstream side to transmit a test signal via the normal optical line 14-1, and sends the emergency optical line 14-2 to the disaster prevention receiving panel 12. , a disconnection fault signal indicative of a disconnection fault 200 in the standby optical line 14-2 between the adjacent optical repeater amplifier 20-2 is transmitted and notified.

The disaster prevention receiver 12 also stops receiving the test signal from the upstream side of the standby optical line 14-2 due to the disconnection failure 200. Since it is longer than the waiting time Tw2 to be judged, the test signal is received by the detour relay of the optical repeater amplifier 20-1 before the time during which the test signal is not received reaches the waiting time Tw1, and the disconnection failure 200 is duplicated in the disaster prevention receiving board 12. do not judge by

For this reason, as indicated by the dashed arrow in FIG. 17, the optical repeater amplifier 20-2 receives the test signal from the upstream side of the backup optical line 14-2 against the disconnection failure 200 of the backup optical line 14-2. By relaying to the upstream side of the regular optical line 14-1 and by relaying the test signal received from the downstream side of the regular optical line 14-1 to the upstream side of the standby optical line 14-2 by the optical repeater amplifier 20-1, The disconnection monitoring is continued by detouring the failure point and circulating the test signal from the regular optical line 14-1 to the standby optical line 14-2.

Here, the detour relaying of the test signal by the optical repeater amplifiers 20-1 and 20-2 uses all of the normal amplifier section 90, the standby amplifier section 92 and the detour amplifier section 94 of the optical repeater amplifier 20 shown in FIG. The test signal is determined from the received signal and relayed by a detour.

(Disconnection failure of standby optical line between optical repeater amplifier and terminating equipment)
FIG. 18 is an explanatory diagram showing detour transmission of a test signal when a break in a standby optical line between an optical repeater amplifier and a terminating device is broken in disconnection monitoring in which a test signal is circulated from a regular optical line to a standby optical line. be.

As shown in FIG. 18, when a disconnection fault 200 occurs in the standby optical line 14-2 between the optical repeater amplifier 20-2 and the terminating device 22, the optical repeater amplifier 20-2 located upstream of the disconnection point disconnects the standby optical line 14-1 when no test signal is received from the downstream side of the standby optical line 14-2 within a predetermined waiting time Tw2 after transmission of the test signal to the regular optical line 14-1. and instructs the termination device 22 adjacent on the downstream side to transmit a test signal via the regular optical line 14-1, and transmits the test signal to the disaster prevention receiving board 12 via the standby optical line 14-2. A disconnection fault signal indicative of a disconnection fault 200 in the standby optical line 14-2 with the device 22 is transmitted to notify.

The disaster prevention receiving panel 12 and the optical repeater amplifier 20-1 also stop receiving the test signal from the downstream side of the standby optical line 14-2 due to the disconnection fault 200, but the waiting times Tw1 and Tw2 for judging the disconnection fault are Since the optical repeater amplifier 20-2 is longer than the wait time Tw3 for judging a disconnection fault, the test signal is received by the detour relay of the optical repeater amplifier 20-2 before the time during which the test signal is not received reaches the wait times Tw1 and Tw2. Therefore, the disconnection failure 200 is not judged redundantly by the disaster prevention receiving panel 12 and the optical relay amplifier 20-1.

Therefore, as indicated by the dashed arrow in FIG. 18, the terminating device 22 transmits the test signal received from the regular optical line 14-1 to the regular optical line 14-1 in response to the disconnection failure 200 of the standby optical line 14-2. The optical repeater amplifier 20-2 relays the test signal received from the downstream side of the regular optical line 14-1 to the upstream side of the protection optical line 14-2 to bypass the disconnection point and -1 continues the disconnection monitoring by circulating the test signal from the standby optical line 14-2.

(Disconnection failure of standby optical line between optical repeater amplifiers)
FIG. 19 is an explanatory diagram showing detour transmission of a test signal in the case of breakage monitoring in which a test signal is circulated from a regular optical line to a standby optical line when the standby optical line between the disaster prevention receiving panel and the optical repeater amplifier is broken. is.

As shown in FIG. 19, when a disconnection fault 200 occurs in the standby optical line 14-2 between the disaster prevention receiver 12 and the optical repeater amplifier 20-1, the disaster prevention receiver 12 located upstream of the disconnection point If no test signal is received from the downstream side of the protection optical line 14-2 within a predetermined waiting time Tw1 after transmission of the test signal to the regular optical line 14-1, it is determined that the protection optical line 14-2 is broken. Then, the optical repeater amplifier 20-1 adjacent on the downstream side is instructed to transmit a test signal via the regular optical line 14-1, and the standby optical line 14- between the adjacent optical repeater amplifier 20-1. 2 disconnection failure 200 is determined and notified.

Therefore, as indicated by the dashed arrow in FIG. 19, the optical repeater amplifier 20-1 receives the test signal from the downstream side of the protection optical line 14-2 against the disconnection failure 200 of the protection optical line 14-2. By relaying to the upstream side of the normal-use optical line 14-1, the disconnection point is detoured, and disconnection monitoring is continued by circulating the test signal from the normal-use optical line 14-1 to the backup optical line 14-2.

[Disconnection monitoring of standby optical line by loopback of test signal]
FIG. 20 shows detour transmission of the test signal when the standby optical line between the optical repeater amplifiers is broken in disconnection monitoring in which the test signal is circulated from the regular optical line to the backup optical line for each optical repeater amplifier and each terminating device. It is an explanatory view showing the.

In the embodiment of FIG. 20, in a normal state, the disaster prevention receiver 12 periodically transmits test signals for monitoring disconnection to the regular optical line 14-1, and optical repeater amplifiers 20-1 and 20-2. When receiving the test signal from the upstream side of the regular optical line 14-1, the terminal device 22 loops back and repeats the test signal to the upstream side of the protection optical line 14-2, so that the optical repeater amplifier 20- 1, 20-2, and terminating equipment 22, a test signal is circulated from the regular optical line 14-1 to the standby optical line 14-2 to monitor disconnection.

As shown in FIG. 20, when a disconnection fault 200 occurs in the standby optical line 14-2 between the optical repeater amplifiers 20-1 and 20-2, the optical repeater amplifier 20-1 located upstream of the disconnection point has transmitted the test signal to the regular optical line 14-1, and the test signal is not received from the downstream side of the standby optical line 14-2 even when the waiting time Tw2 has been reached. A disconnection of the optical line 14-2 is determined.

The control when the optical repeater amplifier 20-1 determines that the protection optical line 14-2 is disconnected is the same as in FIG. In addition to instructing the transmission of the test signal, the disconnection indicating the disconnection fault 200 of the standby optical line 14-2 between the adjacent terminal device 22 to the disaster prevention receiving panel 12 via the standby optical line 14-2 A fault signal is sent to alert the user.

Further, in FIG. 20, the optical repeater amplifier 20-2 judges disconnection failure of the standby optical line 14-2 between the optical repeater amplifier 20-2 and the terminating device 22, and the same control as shown in FIG. 18 is performed. .

Furthermore, in FIG. 20, the disaster prevention receiver board 12 judges disconnection failure of the standby optical line 14-2 between the disaster prevention receiver board 12 and the optical repeater amplifier 20-1, and the same control as shown in FIG. 19 is performed.

[Modification of the present invention]
(OLTs and ONUs)
In the above-described embodiment, the functions of the optical transmission/reception units 50 and 62 are provided in the disaster prevention receiver 12 and the optical converter 18 on the equipment side. An OLT (Optical Line Terminal) in use may be used, and an ONU (Optical Network Unit) known as an optical network unit may be used as the optical transmitter/receiver 62 on the equipment side.

(gateway device)
In the above embodiment, the functions of the gateways 66 and 92 are provided in the optical converter 18 and the terminal device 22 on the equipment side, but as the gateways 66 and 92, commercially available gateway devices may be used.

(equipment)
In the above-described embodiment, the fire detector and the red indicator light provided in the fire hydrant device, the transmitter, the response lamp, and the fire hydrant switch are taken as examples of equipment that is monitored and controlled by the optical line. The same shall apply to equipment of facilities.

(Non-IP)
In the above embodiment, by setting an IP address in the transmission part of equipment such as a red indicator light, a transmitter, a response lamp, and a fire hydrant switch provided in a fire detector and a fire hydrant device, disaster prevention receivers and equipment Although the transmission control according to the IP protocol is performed between them via an optical line, the present invention is not limited to this. For example, an address other than an IP address may be set in the terminal device, and transmission control may be performed via an optical line according to a predetermined communication protocol, for example, a fire transmission protocol used in R-type fire alarm equipment.

(others)
Moreover, the present invention includes appropriate modifications that do not impair its purpose and advantages, and is not limited by the numerical values shown in the above embodiments.

10: Tunnel 12: Disaster prevention receiver 14-1: Common optical line 14-2: Backup optical line 15: Optical distributor 16: Power line 18: Optical converters 20, 20-1, 20-2: Optical repeater amplifier 22: Termination device 24: Fire hydrant device 25: Fire detector 46: Panel control unit 48: Transmission units 50, 62: Optical transmission/reception units 66, 98, 154: Gateway 68: LAN lines 70, 72: Controller 74: Red display Light 76: Transmitter 78: Response lamp 80: Fire hydrant switch 82: Terminal control unit 84: LAN transmission unit 86: Drive circuit unit 88: Input circuit unit 90: Common relay amplifier unit 92: Backup relay amplifier unit 94: Detour Repeater amplifier 96: Repeater amplifier controller 152: Termination controller 180: Disconnection fault 190: Light intensity drop fault

Claims (3)

Emergency equipment for monitoring and controlling abnormalities in tunnels,
disaster prevention receiver,
a regular optical line and a standby optical line for performing optical signal communication between the equipment on the terminal side installed in the tunnel and the disaster prevention receiving panel;
a plurality of optical repeaters connected in the middle of each line of the regular optical line and the standby optical line;
a termination device connected to each line termination of the regular optical line and the standby optical line;
with
The optical repeater is
normally, relaying the optical signal between the upstream and downstream sides of the regular optical line and between the upstream and downstream sides of the backup optical line;
When the intensity reduction failure of the optical signal received from the upstream side of the regular optical line is detected, the optical intensity is decreased to the disaster prevention receiving panel or another optical repeater adjacent to the upstream side via the backup optical line. A fault signal is transmitted to stop the transmission and reception of the optical signal through the normal optical line, and the optical signal is transmitted and received through the backup optical line, and the upstream side of the backup optical line and the upstream side of the normal optical line. and relaying the optical signal by detour between the downstream side,
When the optical intensity drop failure signal is received from another optical repeater located on the downstream side or from the terminating device, the transmission and reception of the optical signal via the regular optical line is stopped, and the upstream side of the regular optical line is received. detouring and relaying the optical signal to and from the downstream side of the standby optical line;
The disaster prevention receiving board
Normally, the optical signal is transmitted and received through the regular optical line,
when the optical intensity drop failure signal is received from the optical repeater adjacent to the downstream side, stopping transmission/reception of the optical signal through the normal optical line and transmitting/receiving the optical signal through the backup optical line;
The terminal equipment transmits an optical intensity reduction failure signal to the optical repeater adjacent on the upstream side via the backup optical line when detecting the intensity reduction failure of the optical signal received from the regular optical line. stopping transmission and reception of the optical signal through the regular optical line, and detouring and repeating the optical signal between the standby optical line and the regular optical line;
An emergency facility characterized by:
In the emergency equipment according to claim 1,
The disaster prevention receiver periodically transmits a test signal to the regular optical line,
The emergency facility, wherein the optical repeater and the terminal device detect the strength drop failure of the optical signal when the reception level of the test signal drops below a predetermined threshold.
In the emergency equipment according to claim 1,
a plurality of equipment devices connected in the middle of the common optical line;
branch-connected to the common optical line and connected to the equipment by a signal line, converts the optical signal received from the common optical line into an electrical signal, outputs the electrical signal to the equipment, and outputs the electrical signal from the equipment. an optical converter that converts an input electrical signal into the optical signal and transmits the optical signal to the common optical line;
An emergency facility characterized by comprising

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