JP3395697B2 - Branch line digital wireless communication monitoring system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a branch line digital wireless communication monitoring system in a branch line system in which a wireless network extends in a tree shape. In particular, the present invention relates to a branch line digital wireless communication monitoring system that performs monitoring control from a master wireless device to a plurality of slave wireless devices by polling.

[0002]

2. Description of the Related Art For example, long-distance signals between Tokyo and Osaka are bundled and sent, and in general, one-to-one high-capacity transmission trunk lines are used as branch lines for communication between local exchanges. System
In the branch line system, the wireless network spreads in a tree shape. In general, branch line digital wireless communication networks often include a plurality of small networks. It is conceivable to individually monitor and control these plural networks, but this is not practical considering the cost of maintenance personnel and maintenance equipment.

Normally, small-scale networks that are scattered are connected to other lines (main line wireless circuits or wired communication lines) to perform monitoring control from one or several points, thereby reducing the number of maintenance personnel and effectively using maintenance equipment. Is being pursued.
By the way, since the scattered networks are connected to each other, if a normal packet signal is transmitted, packet collision frequently occurs and efficient monitoring control cannot be performed.
For this reason, conventionally, the centralized monitoring station has performed efficient monitoring control by performing polling control between a master wireless device and a plurality of slave wireless devices.

FIG. 7 is a diagram generally showing an example of a branch line digital wireless communication network. As shown in the figure, the network configured by the wireless devices 201 to 214 and the network configured by the wireless devices 215 to 216 are connected by another communication line 103, and monitoring control is performed by a maintenance terminal connected to the wireless device 201. When to do is shown.

Since the wireless device 201, as the master wireless device, monitors and controls the wireless devices 202 to 206 by polling, for example, if the wireless line 100 is disconnected due to a failure, not only the maintenance terminal connected to the wireless device 201,
In order to monitor and control the remaining wireless devices, it is necessary to go to the installation location of each wireless device and connect the maintenance terminal directly to the device to be monitored and controlled.

Further, when the wireless line 102 is disconnected due to a failure, in order to monitor and control the wireless devices 210 to 214, the maintenance terminal is directly attached to the wireless device desired to be installed in each wireless device. Had to connect and do.

[0007]

That is, if a line failure occurs between a master wireless device and a slave wireless device, it is not possible to remotely log in to a plurality of slave wireless devices by using not only a centralized monitoring station but also a maintenance terminal. There was a problem that the maintenance person had to go to a remote wireless device installation place. Therefore, in view of the above problems, the present invention provides a branch line that enables remote login to a slave wireless device to which a maintenance terminal is connected even if a wireless line failure occurs between the master wireless device and the slave wireless device. An object of the present invention is to provide a digital wireless communication monitoring system.

[0008]

In order to solve the above problems, the present invention is a branch line in which digital communication spreads in a tree shape.
In the system, in a branch line digital wireless communication monitoring system that performs monitoring control of a plurality of wireless devices in a master / slave relationship by polling, in each of the plurality of wireless devices,
Monitors slave wireless devices as master wireless devices
A maintenance terminal connection circuit to which a maintenance terminal is connected for control, a polling table that covers slave wireless devices that are master wireless devices that send and receive data, and the wireless device and the maintenance terminal. If there is a wireless line failure between the master wireless device and the slave wireless device, monitoring and control cannot be performed by the master wireless device.
One of the multiple slave wireless devices
A branch line digital wireless communication monitoring system comprising: a routing circuit for switching a wireless device of a rave to a wireless device of a new master .

By this means, even when the wireless line with the master wireless device is disconnected, remote login can be performed with the slave wireless device using the maintenance terminal. Therefore, the maintenance person can monitor the state of the wireless device without going to a remote device installation place . As a reason for detecting a radio link failure slave wireless device because replacing temporarily the wireless device a temporary master.

A table storage circuit is provided in the routing circuit, and the table storage circuit stores the polling table and the network configuration table when the routing circuit belongs to the master wireless device at system startup. In the case of the slave wireless device, the polling table and the network configuration table sent from the master wireless device are stored. By this means, it becomes easy to give the slave wireless device the master function.

The polling table and the network configuration table stored in the table storage circuit of the master wireless device are periodically transmitted to the slave wireless device to the table storage circuit of the slave wireless device. Accumulate. By this means, it becomes possible to deal with a change in the configuration of the branch line system. When the maintenance terminal is connected to the maintenance terminal connection circuit of the slave wireless device, the network configuration table stored in the table storage circuit of the master wireless device is updated.

This is to make it possible to deal with the change of the arrangement of the maintenance terminal by this means. When there is maintenance terminal connection information indicating that the maintenance terminal is connected to the maintenance terminal connection circuit of the slave wireless device from another slave wireless device in the slave wireless device, this information is sent to the master wireless device. Forward.

By this means, the arrangement information of the maintenance terminal is provided not only to the original master wireless device but also to the new master wireless device. The routing circuit, when the wireless device to which it belongs is a master, by polling, a control signal from the maintenance terminal to a specific wireless device,
The monitoring information transmission request signal is sequentially collected from the slave wireless devices and transmitted to the specific wireless device, and the control signal from the specific wireless device to the maintenance terminal and the response of the monitoring information transmission request signal are sequentially transferred to the slave. Collect from wireless devices and send to the maintenance terminal; if the wireless device to which it belongs is the slave wireless device, by polling,
A control signal from the maintenance terminal to another slave wireless device, a monitoring information transmission request signal, a control signal from the other slave wireless device to the maintenance terminal, and a response to the monitoring information request signal are transmitted in the target direction. To do.

By this means, each wireless device is given a polling function, and the slave wireless device is also qualified as the master wireless device. A switching circuit and an alarm control circuit are further provided in the routing circuit, and the switching circuit outputs information that the master wireless device is located first from the contents of the network configuration table stored in the table storage circuit. In the case where it is obtained, when the alarm control circuit notifies that a wireless line failure has occurred, it is determined to switch from the slave wireless device to the master wireless device.

By this means, it is possible to easily switch the master wireless device because there is no need for a complicated procedure for detecting which slave wireless device is to be replaced by the master wireless device and a detection function between the slave wireless devices. The reason is that the slave wireless device that can replace the master wireless device is limited.

If the alarm control circuit cannot detect the polling signal from the master wireless device for a certain period of time, or if the information of the out-of-frame synchronization of the demodulator is transmitted from the opposite station using the wireless line, the wireless line failure occurs. The switching circuit is notified that it has occurred. By this means, it is possible to increase the reliability of monitoring the occurrence of the wireless line failure, and thus the reliability of the switching of the master wireless device is increased.

When the wireless line failure disappears,
The master wireless device is immediately returned to the slave wireless device. By this means, the slave wireless device temporarily becomes a temporary master wireless device, but since it has a minimum polling function for maintenance, it must be restored after the wireless line failure is recovered. This is because.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic block diagram showing a branch line digital wireless communication monitoring system according to the present invention. As shown in the figure, a plurality of wireless devices 1, 2, 3, 4, 5, 6 are provided in the branch line system, and the wireless devices 1 and 2 are provided.
During this period, the wireless devices 3 and 5 and between the wireless devices 4 and 6 are wirelessly connected.

Further, the radio receiving circuit 11 of the radio device 1 is connected to the main signal by the multiplexer 31 , and the radio device 2 is connected to the main signal.
The radio receiving circuits 11 of 3 and 4 are connected to the main signal by the multiplexer 32 , the radio receiving circuit 11 of the wireless device 5 is connected to the main signal by the multiplexer 33 , and the radio receiving circuit 11 of the wireless device 6 is connected by the multiplexer 34 to the main signal. Connected to.

Here, the main signal is, for example, a signal between base stations of a mobile phone, a signal between telephone exchanges, or a signal of a dedicated line. Multiple main signals are multiplexed and separated by multiplexers 31, 32, 33, and 34 . As shown in FIG. 1, a transmission path between the wireless devices 1 and 2, a transmission path between the wireless devices 1 and 5, a transmission path between the wireless devices 1 and 6, and a wireless device 4 and 6. Forms a transmission path for transmitting the main signal.

In the branch line system, a plurality of wireless devices 1, 2, 3,
One of 4, 5, and 6 is a master wireless device, and the others are slave wireless devices. A plurality of wireless devices 1, 2,
A radio transmission / reception circuit 11 is provided in each of 3, 4, 5, and 6, and the radio transmission / reception circuit 11 multiplexes a digital communication data signal and a supervisory control signal to convert into a radio frequency and transmits the same. Separate communication data signals and supervisory control data signals.

Further, a plurality of wireless devices 1, 2, 3, 4,
Each of 5 and 6 is provided with a device monitoring control circuit 12 and a routing circuit 13, and the device monitoring control circuit 12 uses the alarm activation information and the alarm cancellation information of the device itself sent from the wireless transmission / reception circuit 11 as a monitoring information signal. The wireless transmission / reception circuit 1 transmits to the routing circuit 13 and sends a control data signal from the routing circuit 13 to the wireless device itself.
Control 1

As various alarms, digital communication data signal input interruption, digital communication data signal output interruption, radio transmission output interruption, radio reception signal interruption, demodulator frame out of sync, modulator output interruption, bit error alarm , Out-of-frame synchronization of the demodulator of the opposite device, etc.

A maintenance terminal connection circuit 14 is provided in each of the plurality of wireless devices 1, 2, 3, 4, 5, and 6, and the maintenance terminal connection circuit 14 notifies the routing circuit 13 when a maintenance terminal is connected. Let us know.

FIG. 2 is a schematic block diagram showing a configuration example of the routing circuit 13 of each wireless device in FIG. As shown in the figure, the routing circuit 13 includes a branch line connection port 25, which is a connection point with the routing circuits 13 in a plurality of other wireless devices, and a maintenance terminal connection port 26, which is a connection point with the maintenance terminal connection circuit 14. , A wireless device connection port 27 which is a connection point with the device monitoring control circuit 12, and a wireless line connection port 2 which is a connection point with the wireless transmission / reception circuit 11.
It has four ports of 8 and controls the destination regarding the monitoring information and control information between the respective ports. Thus, the routing circuit 13 has a router function.

The routing circuit 13 is further provided with a table storage circuit 22.
When the wireless device including itself is preset as the master wireless device when the system is started up, it is connected to the branch line connection port 25, the maintenance terminal connection port 26, the wireless device connection port 27, and the wireless line connection port 28. It stores a network configuration table that covers other wireless devices and maintenance terminals that are in use, and also stores a polling table that covers wireless devices of other slaves for transmitting / receiving data by polling.

Further, when the wireless device including itself is preset as a slave wireless device when the system is started up, the table storage circuit 22 is provided with the above-mentioned network configuration table sent from the master wireless device by polling. Accumulate polling tables. The routing circuit 13 is further provided with a switching circuit 21, and the table storage circuit 22 which itself belongs to the slave wireless device determines that the master wireless device has the wireless circuit connection port 28 based on the contents of the stored network configuration table. When it is detected that it is located first, a master detection signal is sent to the switching circuit 21. Entitle the slave wireless device that can detect this to become the master wireless device,
Restrict qualifications.

The routing circuit 13 is further provided with a data storage circuit 23, and the data storage circuit 23 stores various alarm activation information and alarm release information of the wireless device itself as a monitoring information signal. Routing circuit 13
Further, the alarm control circuit 24 is provided, and the alarm control circuit 24 detects out-of-frame synchronization of the demodulator from the monitor information signals accumulated in the data accumulating circuit 23 and notifies the switching circuit 21 of it.

When the wireless device including itself is preset as the master wireless device when the system is started up, the switching circuit 21 is first connected to the branch line connection port 25 and the wireless line port 28. The slave wireless device is polled using the polling table stored in the table storage circuit 22. That is, the control signal from the maintenance terminal to the specific wireless device and the monitoring information transmission request signal are sequentially collected from the slave wireless devices and transmitted to the specific wireless device. Further, the response of the control signal and the monitoring information transmission request signal from the corresponding characteristic wireless device to the maintenance terminal is sequentially collected from the slave wireless device and transmitted to the maintenance terminal which has output the control signal or the monitoring information transmission request signal.
In this way, the switching circuit 21 functions as a router.

Secondly, the switching circuit 21 periodically transmits the polling table and the network configuration table stored in the table storage circuit 22 to the slave wireless device. Thirdly, the switching circuit 21 updates the network configuration table stored in the table storage circuit 22 when the maintenance terminal is connected to the master wireless device or the slave wireless device. Fourth, the switching circuit 21
Transmits an out-of-frame signal of the demodulator of the device itself from the alarm control circuit 24 to the opposite station using a wireless circuit.

When the switching circuit 21 is preset as a slave wireless device when the system is started up, first, the switching circuit 21 receives a specific wireless signal from the maintenance terminal via the branch line connection port 25 and the wireless line connection port 28. The control signal to the device and the monitoring information transmission request signal, and the response of the control signal and the monitoring information transmission request signal from the corresponding specific wireless device to the maintenance terminal are sent to the destination direction by the network configuration table stored in the table storage circuit 22. Send out. In this way, the switching circuit 21 functions as a router.

Secondly, the switching circuit 21 periodically receives the polling table and the network configuration table transmitted from the master wireless device and stores them in the table storage circuit 22. Thirdly, the switching circuit 21 is the maintenance terminal connection circuit 1
When the terminal connection information indicating that the maintenance terminal has been connected is received from 4, the terminal information is transferred to the master wireless device.

Fourthly, the switching circuit 21 receives the master detection signal from the table storage circuit 22, and the frame synchronization of the demodulator from the alarm control circuit 24 is lost. When the polling signal from the wireless communication device is not detected, or when the out-of-frame signal of the demodulator from the opposite station is detected, it becomes the master wireless device with respect to the other slave wireless devices. Since the slave wireless device is switched to the master wireless device as described below, highly reliable information is used as the above information from the alarm control circuit 24 in order to improve the reliability. In this case, polling is performed using the polling table stored in the table storage circuit 22. That is, the control signal from the maintenance terminal to the specific wireless device and the monitoring information transmission request signal are sequentially collected from the slave wireless devices,
It is transmitted to the specific wireless device. Also, responses of the control signal and the monitoring information transmission request signal from the corresponding specific wireless device to the maintenance terminal are sequentially collected from the slave wireless devices and transmitted to the maintenance terminal which has output the control signal or the monitoring information transmission request signal. In this way, the switching circuit 21 functions as a router.

However, when the polling signal from the original master wireless device or the out-of-frame signal of the demodulator of the opposite station is recovered, the slave wireless device immediately returns. This is because the slave wireless device is temporarily changed to a temporary master wireless device, but since the slave wireless device has only a minimum polling function for maintenance, it is returned to the original state after the wireless line failure recovery. Fifthly, the switching circuit 21 detects the out-of-frame signal of the demodulator from the opposite station as described above. Send to the opposite station using the circuit. This is because the wireless line failure caused by the master wireless device itself is directly detected.

Next, the operation of the monitoring system of FIG. 1 will be described with reference to FIG. Note that the following description will be made assuming that the wireless device 1 in FIG. 1 is the master wireless device 1 and the wireless devices 2 to 6 are slave wireless devices 2 to 6.

When the system starts operating, the master wireless device 1 of the present invention sends the network configuration table and the polling table set in the table storage circuit 22 at the time of startup to the wireless transmission / reception circuit 11 as a monitoring control data signal. And it is multiplexed with the digital communication data signal and transmitted to the slave wireless device 2. Slave wireless device 2
Then, the wireless transmission / reception circuit 11 receives the received wireless signal from the master wireless device 1, separates it into a supervisory control data signal and a digital communication data signal, and sends the supervisory control data signal to the routing circuit 13.

In the routing circuit 13 of the slave wireless device 2, the network configuration table and the polling table sent from the master wireless device 1 via the wireless line connection port 28 are stored in the table storage circuit 22.
The slave wireless device 2 sends the accumulated data to the routing circuit 13 of the other slave wireless devices 3 and 4 connected to the slave wireless device 2 via the branch circuit connection port 25 opposite to the wireless line connection port 28. The slave wireless device 3 stores in the table storage circuit 22 the network configuration table and the polling table sent from the slave wireless device 2 via the branch circuit connection port 25. With this accumulation, the aforementioned table is sent to the wireless transmission / reception circuit 11 via the wireless line connection port 28 opposite to the branch circuit connection port 25. The wireless transmission / reception circuit 11 multiplexes the network configuration table and the polling table with the digital communication data signal as a supervisory control data signal and sends it to the slave wireless device 5.

After a certain time (several seconds to several tens of seconds) according to the scale of the network, the master wireless device 1 starts polling the slave wireless device. Figure 3
FIG. 6 is a diagram for explaining the flow of supervisory control data signals between each device. As shown in the figure, the master wireless device 1 transmits a network configuration table and a polling table to slave slave wireless devices under its control. The signal flow in the wireless device is as described above, and the master wireless device 1 uses the polling table to sequentially issue table reception response requests to the slave wireless devices under its control and wait for a response.

After confirming the table reception responses from all the slave wireless devices under its control, the master wireless device 1 sequentially issues a state change response request to the slave wireless devices under its control and waits for a response. In the slave wireless device having no state change, the routing device 13 creates a response signal without state change and transmits the response signal to the master wireless device 1. The slave wireless device having the state change transmits a response signal according to the state change to the master wireless device 1.

Next, a case where the maintenance terminal is connected to the slave wireless device 2 will be described in the middle part of FIG. The maintenance terminal is connected to the maintenance terminal connection circuit 14 of the slave wireless device 2 and sends out a connection request signal. The maintenance terminal connection circuit 14 that receives the connection request signal from the maintenance terminal is the routing circuit 1
The terminal connection information is sent to 3. In the routing circuit 13, when the master wireless device 1 makes a state change response request, the terminal connection information is sent to the wireless circuit connection port 28 where the master wireless device 1 is located by the network configuration table of the table storage circuit 22 as a monitor control data signal. Send out.

Further, the supervisory control data signal is multiplexed with the digital communication data signal by the wireless transmission / reception circuit 11 and sent to the master wireless device 1. In the master wireless device 1, the wireless transmission / reception circuit 11 separates the received wireless signal into a supervisory control data signal and a digital communication data signal, and sends the supervisory control data signal to the routing circuit 13. The routing circuit 13 adds the above-mentioned terminal connection information to the network configuration table of the table storage circuit 22.

When the maintenance terminal is connected to another slave wireless device, the terminal connection information is sent to the master wireless device 1 by the same flow. A case where the maintenance terminal is connected to the slave wireless device 3 will be described in the middle part of FIG. The maintenance terminal is connected to the maintenance terminal connection circuit 14 of the slave wireless device 3 and sends out a connection request signal. Upon receiving the connection request signal from the maintenance terminal, the maintenance terminal connection circuit 14 sends the terminal connection information to the routing circuit 13.

In the routing circuit 13, when a status change response request is sent from the master wireless device 1 via the slave wireless device 2, the terminal connection information is used as a monitoring control data signal by the network configuration table of the table storage circuit 22 to determine the master wireless device. 1 is sent to the branch circuit connection port 25. In the routing circuit 13 of the slave wireless device 2, the monitoring control data signal input from the branch circuit connection port 25 is transmitted from the wireless line connection port 28 of the master wireless device 1 to the wireless transmission / reception circuit according to the network configuration table of the table storage circuit 22. 11 is sent to the master wireless device 1 after being multiplexed with the digital communication data signal.

In the master radio apparatus 1, the radio transmission / reception circuit 11 separates the received radio signal into a supervisory control data signal and a digital communication data signal, and sends the supervisory control data signal to the routing circuit 13. The routing circuit 13 adds the terminal connection information to the network configuration table of the table storage circuit 22. By updating the network configuration table, the master wireless device 1 transmits the network configuration table to the slave wireless devices under its control. FIG. 4 is a diagram illustrating an example in which the maintenance terminal connected to the slave wireless device 2 requests monitoring information of the slave wireless device 3 and collects the monitoring information in the maintenance terminal.

The master wireless device 1 sequentially issues status change response requests to the slave wireless devices under its control and waits for a response. In the slave wireless device having no state change, the routing circuit 13 creates a response signal without state change and transmits it to the master wireless device 1. The slave wireless device having the state change transmits a response signal according to the state change to the master wireless device 1.

A monitoring information request signal of the slave wireless device 3 is transmitted from the maintenance terminal connected to the maintenance terminal connection circuit 14 of the slave wireless device 2. The maintenance terminal connection circuit 14, which has received the monitoring information request signal from the maintenance terminal, sends the monitoring information request signal to the routing circuit 13. In the routing circuit 13, when a status change response request is received from the master wireless device 1, the monitoring information request signal is used as a monitoring control data signal, and the network configuration table of the table storage circuit 22 allows the wireless connection port 28 of the master wireless device 1 to exist. Send to.

Further, the supervisory control data signal is multiplexed with the digital communication data signal by the wireless transmission / reception circuit 11 and sent to the master wireless device 1. In the master wireless device 1, the wireless transmission / reception circuit 11 separates the received wireless signal into a supervisory control data signal and a digital communication data signal, and sends the supervisory control data signal to the routing circuit 13. The routing circuit 13 transmits a monitoring information request reception response to the slave wireless device 2 at the next polling, and the slave wireless device 2
A monitoring information request signal is transmitted to the slave wireless device 3 via.

The slave wireless device 3 that has received the monitor information request signal sends the monitor information stored in the data storage circuit 23 to the routing circuit 13 as a monitor information signal. The master wireless device 1 that has received the monitoring information signal from the slave wireless device 3 via the slave wireless device 2
The monitoring information signal of the slave wireless device 3 is transmitted to the slave wireless device 2 in the next polling cycle. The slave wireless device 2 sends the monitoring information signal received by the routing circuit 13 to the maintenance terminal via the maintenance terminal connection circuit 14.

The maintenance terminal receiving the monitor information signal of the slave wireless device 3 returns a reception response signal to the slave wireless device 2, and the slave wireless device 2 receives the monitor information to the master wireless device 1 in the next polling cycle. Return a response.

FIG. 5 and FIG. 6 are views for explaining the flow of the supervisory control data signal between the master wireless device 1 and the slave wireless device 2 in the event of a wireless line failure. In the configuration of FIG. 1, if a wireless line failure occurs between the master wireless device 1 and the slave wireless device 2, the qualification of the next master wireless device is the slave wireless device 2,
Although the slave wireless device 5 and the slave wireless device 6 exist, the slave wireless device 2 is assumed to be the next master wireless device in the following description.

In the slave wireless device 2, the master wireless device 1 is determined from the contents of the network configuration table stored in the table storage circuit 22 of the routing circuit 13.
Is detected at the tip of the wireless circuit connection port 28, and a master detection signal is sent to the switching circuit 21. Further, when the alarm control circuit 24 detects the demodulator out of frame synchronization and the polling signal from the master wireless device 1 is not detected by the switching circuit 21 for a certain period of time, or when the demodulator frame synchronization from the opposite station is detected. When the disconnection signal is detected, the slave wireless device 2 becomes the master wireless device for the other slave wireless devices. In this case, the switching circuit 21 uses the polling table stored in the table storage circuit 22 to collect control signals and monitoring information transmission request signals from the maintenance terminal to the specific wireless device sequentially from the wireless devices of the subsequent slaves by polling, and A maintenance terminal that transmits to a specific wireless device or collects control signals and monitoring information transmission request signals from the corresponding specific wireless device to the maintenance terminal sequentially from the wireless device of the subsequent slave and outputs a control signal or a monitoring information transmission request signal. Send to. Thus, the switching circuit 21 plays the role of a router.

However, when the polling signal from the original master wireless device or the out-of-frame signal of the demodulator of the opposite station is recovered, the process immediately returns to the slave wireless device. The slave wireless device 2 is the slave wireless device 4 to
The operation after becoming the master wireless device for 6 is the same as that of the master wireless device in FIGS. 3 and 4.

[0053]

As described above, according to the present invention,
The first effect is that even when the wireless line with the master wireless device is disconnected, remote login can be performed between the slave wireless devices using the maintenance terminal. Therefore, the maintenance person can monitor the condition of the device without going to a remote device installation place. The reason is that a wireless disconnection is detected and the slave wireless device is temporarily replaced with the temporary master wireless device. The second effect is that it does not require a complicated procedure and detection function between the slave wireless devices to determine which slave wireless device replaces the master wireless device. The reason is that the slave wireless devices that can replace the master wireless device are limited.

[Brief description of drawings]

FIG. 1 is a schematic block diagram showing a branch line digital wireless communication monitoring system according to the present invention.

FIG. 2 is a routing circuit 1 of each wireless device in FIG.
It is a schematic block diagram which shows the structural example of 3.

FIG. 3 is a diagram illustrating a flow of a supervisory control data signal between devices.

FIG. 4 is a diagram illustrating an example in which a maintenance terminal connected to a slave wireless device 2 requests monitoring information of a slave wireless device 3 and collects the monitoring information in the maintenance terminal.

FIG. 5 is a diagram for explaining the flow of a supervisory control data signal between each device when a wireless line failure occurs between the master wireless device 1 and the slave wireless device 2.

FIG. 6 is a diagram for explaining the flow of a supervisory control data signal between each device when a wireless line failure occurs between the master wireless device 1 and the slave wireless device 2.

FIG. 7 is a diagram generally illustrating an example of a branch line digital wireless communication network.

[Explanation of symbols]

1 to 6 ... Wireless device 11 ... Radio receiver circuit 12 ... Device monitoring control circuit 13 ... Routing circuit 14 ... Maintenance terminal connection circuit 21 ... Switching circuit 22 ... Table storage circuit 23 ... Data storage circuit 24 ... Alarm control circuit 31-34 ... Multiplexer

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Claims (11)

(57) [Claims] 1. A branch line in which digital communication spreads like a tree.
In a branch line digital wireless communication monitoring system for monitoring and controlling a plurality of wireless devices in a master / slave relationship by polling, in each of the plurality of wireless devices, a slave wireless device is monitored and controlled as a master wireless device.
Exhaustive and maintenance terminal connecting circuit maintenance terminal for performing control is connected, the polling table that covers a radio apparatus of a destination slave to send and receive data as a master of the wireless device, the wireless device and the maintenance terminal If there is a wireless line failure between the master wireless device and the slave wireless device, monitoring control cannot be performed by the master wireless device.
One of the multiple slave wireless devices
A branch line digital wireless communication monitoring system, comprising: a routing circuit for switching a master wireless device to a new master wireless device . 2. The routing circuit is provided with a table storage circuit, and when the routing circuit belongs to the master wireless device at system startup, the table storage circuit includes the polling table and the network configuration table. 2. The branch line system according to claim 1, wherein the polling table and the network configuration table sent from the wireless device of the master are stored in the case of the wireless device of the slave. Digital wireless communication monitoring system. 3. The polling table and the network configuration table stored in the table storage circuit of the master are periodically transmitted to the slave wireless device to be stored in the table storage circuit of the slave wireless device. The branch line digital wireless communication monitoring system according to claim 2, wherein 4. When the maintenance terminal is connected to the maintenance terminal connection circuit of the slave wireless device, the network configuration table stored in the table storage circuit of the master wireless device is updated. The branch line digital wireless communication monitoring system according to claim 2. 5. When the slave wireless device receives maintenance terminal connection information from another slave wireless device indicating that the maintenance terminal has been connected to the maintenance terminal connection circuit of the slave wireless device, this maintenance terminal connection information is sent. The branch line digital wireless communication monitoring system according to claim 2, wherein the system is transferred to the master wireless device. 6. The routing circuit, when the wireless device to which it belongs is the master wireless device, sequentially polls control signals from the maintenance terminal to a specific wireless device and a monitoring information transmission request signal by the slave. From the wireless device of the slave wireless device to transmit to the specific wireless device, the control signal from the specific wireless device to the maintenance terminal, the response of the monitoring information transmission request signal is sequentially collected from the slave wireless device, the maintenance terminal. Characterized by sending to,
The branch line digital wireless communication monitoring system according to claim 1. 7. The routing circuit, when the wireless device to which the routing circuit belongs is the slave wireless device, controls the polling control signal from the maintenance terminal to another slave wireless device, a monitoring information transmission request signal, by polling. 2. The branch line digital wireless communication monitoring system according to claim 1, wherein a response of the control signal and the monitoring information request signal from the other slave wireless device to the maintenance terminal is transmitted in a target direction. 8. The routing circuit is further provided with a switching circuit and an alarm control circuit, and the switching circuit is configured such that the master wireless device first determines the contents of the network configuration table stored in the table storage circuit. In the case where the information indicating that the wireless communication terminal is located, when the alarm control circuit notifies that a wireless line failure has occurred, a determination is made to switch from the slave wireless device to the master wireless device. 2. A branch line digital wireless communication monitoring system according to 2. 9. The alarm control circuit, when a polling signal cannot be detected from the master wireless device for a certain period of time,
9. The branch line digital radio communication monitoring system according to claim 8, wherein the switching circuit is notified that a radio line failure has occurred. 10. The alarm control circuit informs the switching circuit that a wireless line failure has occurred when the information about the out-of-frame synchronization of the demodulator is transmitted from the opposite station using the wireless line. The branch line digital wireless communication monitoring system according to claim 8. 11. The branch line digital radio communication monitoring system according to claim 1, wherein when the radio line failure disappears, the master radio device is immediately returned to the slave radio device.