JP2007281800A - Automatic synchronization signal switching device and its method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an automatic synchronization signal switching device and its method which detect a trouble of a master repeater set outputting a synchronization signal, and perform automatic switching to a new master. <P>SOLUTION: The device determines relation of a master between main CPUs 9 of a plurality of repeater sets 100 in an initial establishment, notifies it to a sub-CPU 1. If the CPU is a master, it outputs a synchronization signal to a plurality of repeater sets from a first MPU 2 through synchronization signal driver/receiver 7, and outputs to the sub-CPU 1 through a second switch 6 and supervises. If it is a slave, it receives the synchronization signal of another master through the synchronization signal driver/receiver 7 and a first switch 5, supervises by the sub-CPU 1, detects a trouble of the master, and if there is a trouble, a new master is set among a plurality of repeater sets. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a synchronization signal of a plurality of repeater sets constituting a repeater, and a synchronization signal automatic switching device for detecting a failure of a master repeater set that outputs a synchronization signal and automatically switching to a new master. Regarding the method.

  FIG. 4 is a repeater configuration diagram showing the configuration of a conventional repeater using a plurality of repeater sets. In FIG. 4, the repeater 200 includes a master repeater set 110 and slave repeater sets 120, 130, 140, and 150. The synchronization signal is output from the master repeater set 110 and transmitted to the slave repeater sets 120, 130, 140, and 150. Further, they are connected to each other by Ethernet (registered trademark), and perform communication for control related to connection of communication channels necessary as repeaters.

  Each set has DIP switches 111-151 and PC connection ports 112-152, respectively, and the master-slave relationship is determined by the settings of the DIP switch, and the PC is connected to the PC connection port, and the necessary communication for each. The software was set up. For this reason, when the master repeater set 110 fails and does not output a synchronization signal, the administrator makes one of the repeater sets 120, 130, 140, and 150 operating as a slave master. Until the DIP switch was reset and the communication software was replaced from the PC connection port, the function as a repeater remained stopped.

The repeater setting location varies depending on the communication environment, so it takes more time to reconfigure a repeater set up in a remote location than a repeater installed in the vicinity, causing trouble in communication work It was. In Patent Document 1, the communication interruption detection means detects that a fixed relay radio device that relays monitoring control data of an alarm station to and from the control monitoring station is not able to communicate with the control monitoring station during normal times. Then, it is described that the balloon carrying the mobile relay radio device is released into the air and communication for relaying the monitoring data of the alarm station is performed.
JP-A-2005-94181

  The present invention has been made to solve such a problem. The purpose of the present invention is to detect a failure of a repeater set of a plurality of repeater sets constituting a repeater and automatically switch to a new master. An object of the present invention is to provide an automatic synchronizing signal switching device and method therefor.

  A synchronization signal automatic switching device according to the present invention is a synchronization signal automatic switching device that automatically switches the synchronization signals of a plurality of repeater sets that constitute a repeater, and includes a main CPU, a sub CPU, a first MPU, a second MPU, and a synchronization signal. It consists of a driver / receiver, a first switch, a second switch, and a LAN connection section. In the initial setting of the repeater, the main CPU of the plurality of repeater sets communicates with the other plurality of repeater sets via the LAN connection section. , Determine the relationship between the master and the slave and notify the sub CPU, and if it is the master, the sub CPU outputs the synchronization signal from the first MPU to the other repeater sets via the synchronization signal driver / receiver, And if it is a slave, it outputs to the sub CPU, the first MPU and the second MPU via the second switch. Received via the synchronization signal driver receiver and a first switch from the master of the other set for a plurality of repeaters, characterized by input sub CPU, the first 1MPU and second 2MPU.

  The sub CPU of the synchronous automatic switching device of the present invention monitors the input synchronization signal, and determines that the master has failed when the synchronization signal stops, and the main CPU communicates with a plurality of other repeater sets via the LAN connection unit. It communicates, determines the relationship between a master and a slave at the time of failure, outputs a synchronization signal if it is a master, and receives a synchronization signal if it is a slave.

  The monitoring of the synchronization signal of the sub CPU of the automatic synchronization switching device of the present invention is performed by counting the clock of the internal counter of the sub CPU using the synchronization signal as a trigger.

  The synchronous automatic switching method of the present invention is a synchronous signal automatic switching method for automatically switching the synchronization signals of a plurality of repeater sets that constitute a repeater, and in the initial setting of the repeater, between the master and the plurality of repeater sets. Determining the relationship with the slave; the master repeater set outputting a synchronization signal; the slave repeater set receiving the synchronization signal; and a plurality of repeater sets monitoring the synchronization signal. When the synchronization signal stops, the step of determining that the master repeater set is faulty, the step of determining the relationship between the master and the slave at the time of failure among the sets of repeaters, and the master are synchronized A step of outputting a signal and a step of receiving a synchronization signal if a slave. The features.

  According to the present invention, since a plurality of repeater sets constituting a repeater detect a failure of a master repeater set and automatically switch to a new master, it becomes possible to ignore a failure time due to a repeater synchronization signal. This eliminates the need for a recovery operation by the administrator using the synchronization signal.

  Embodiments of a synchronous automatic switching device according to the present invention will be described with reference to the drawings. FIG. 1 is a circuit block diagram showing a configuration of a synchronous automatic switching device according to the present invention. 1, a repeater set 100 includes a sub CPU 1, a first MPU 2, a second MPU 3, a VCXO 4, a first switch 5, a second switch 6, a synchronization signal driver / receiver 7, a synchronization signal connector 8, a main CPU 9, and a LAN connection unit 10. And an Ethernet connector 11.

  The general-purpose port terminal of the sub CPU 1, the switch control terminals of the first switch 5 and the second switch 6, the drive enable terminal and the receive enable terminal of the synchronization signal driver / receiver 7 are connected to each other. The receive terminal of the synchronization signal driver / receiver 7 and the input terminal of the first switch 5 are connected, and the drive terminal, the input terminal of the second switch 6 and the general-purpose port terminal of the first MPU 2 are connected. The output terminals of the first switch 5 and the second switch 6, the interrupt port terminals of the first MPU 2 and the second MPU 3, and the timer input terminal of the sub CPU 1 are connected.

  The synchronization signal driver / receiver 7 is connected to the synchronization signal connector 8 and transmits / receives a synchronization signal to / from other plural repeater sets. The sub CPU 1 is connected to the main CPU 9, the main CPU 9 is connected to the LAN connection unit 10, and the LAN connection unit 10 is connected to the Ethernet connector 11. The main CPU 9 performs communication for control related to connection of communication channels necessary as a repeater with a plurality of other repeater sets via an Ethernet line (not shown), and sends a communication control command to the sub CPU 1. Based on this command, the sub CPU 1 instructs the audio processing of the first MPU 2 and the second MPU 3 and the modulation / demodulation processing of a transceiver (not shown) to establish communication with other repeaters or mobile radios. The VCXO 4 is connected to the first MPU 2 and the second MPU 3.

  When power is turned on to the repeater set 100, initial setting is started. In the initial setting of the repeater set 100, the main CPU 9 communicates with a plurality of other repeater sets via the LAN connection unit 10 to determine a master / slave relationship. When the sub CPU 1 receives a master instruction from the main CPU 9, it outputs a high level signal from the general-purpose port to the control terminals of the first switch 5 and the second switch 6. Therefore, the first switch 5 is turned off, the second switch 6 is turned on, the driver enable of the synchronization signal driver / receiver 7 is turned on, and the receive enable is turned off. As a result, the synchronization signal generated by the VCXO 4 is output from the general-purpose port of the first MPU 2 to the other plurality of repeater sets via the synchronization signal driver / receiver 7 and the sub CPU 1 and the second CPU 6 via the second switch 6. It is output to 1MPU2 and 2nd MPU3.

  If the instruction from the main CPU 9 is a slave, the sub CPU 1 outputs a low level signal from the general-purpose port to the control terminals of the first switch 5 and the second switch 6. Therefore, the first switch 5 is turned on, the second switch 6 is turned off, the driver enable of the synchronization signal driver / receiver 7 is turned off, and the receive enable is turned on. As a result, the synchronization signal is received from the master of the plurality of other repeater sets via the synchronization signal driver / receiver 7 and the first switch 5, and sent to the timer input terminal of the sub CPU 1, the interrupt ports of the first MPU 2 and the second MPU 3. input.

  In order to monitor the received synchronization signal, the sub CPU 1 starts an operation of counting the clock of the internal counter of the sub CPU 1 using the synchronization signal as a trigger. If the counting is not performed normally, it is determined that the synchronization signal has been stopped due to the failure of the master, and the main CPU 9 communicates with a plurality of other repeater sets via the LAN connection unit 10 to determine whether the master or slave at the time of the failure. Determine the relationship. If it is a master, a synchronization signal is output in the same manner, and if it is a slave, a synchronization signal is received.

  In the master repeater set, the synchronization signal is output to the sub CPU 1, the first MPU 2, and the second MPU 3, so the sub CPU 1 of the master repeater set executes the same counting operation based on the synchronization signal at the timer input terminal. . The determination of the master or slave may be, for example, in the order in which the Ethernet IP addresses are younger or the set order of the control channels.

  FIG. 2 is a timing chart showing an internal clock counting procedure for monitoring a synchronization signal according to the present invention. Assuming that the period of the synchronization signal input to the timer input terminal of the sub CPU 1 in FIG. 1 is 80 ms and the clock of the internal counter of the sub CPU 1 is divided by 14.6745 MHz by 32 (denoted as f32), one period of the synchronization signal is 80 ms. The counter number of f32 is 80 ms × (14.7456 MHz / 32) = 36864. By setting the initial value of the internal counter to be counted down to 36864 (0x9000) or more, the counter is reloaded to the initial value by the trigger by the synchronization signal before the counter underflows.

  If the initial value of the internal counter is 0xFFFF (hexadecimal), it takes (1 / 14.7456 MHz) × 32 × 0xFFFF≈142.2 ms for the counter to start with a single trigger and count down. When the internal counter is triggered by the synchronization signal in period 1 in FIG. 2, the internal counter is set to 0xFFFF with an initial value and starts counting down. When the internal counter is counted down to 0x6FFF in one period of the synchronization signal, Retried to the initial value by triggering the synchronization signal of period 2, and starts counting down again.

  If this process is repeated, the sub CPU 1 determines that the synchronization signal is normally input. However, when the trigger by the synchronization signal is stopped in period 3, the counter continues to count down, so that the value of the counter exceeds 0x0000 in period 3 and underflows. When underflow occurs, an interrupt due to underflow occurs in the sub CPU 1. When the interrupt is generated, the sub CPU 1 determines that a failure in which the synchronization signal is stopped has occurred in the master, and notifies the main CPU 9 of the failure. The main CPU 9 communicates with a plurality of other repeater sets via the LAN connection unit 10 to determine a master / slave relationship at the time of failure. If it is a master, the sub CPU 1 outputs a synchronization signal, and if it is a slave, it receives the synchronization signal.

  FIG. 3 is a flowchart showing a method for automatically switching synchronization signals according to the present invention. In FIG. 3, when power is supplied to the repeater set, initial setting is started (step 10). The repeater set communicates with other repeater sets to determine the master / slave relationship (step 20). If it is a master, while outputting a synchronizing signal to another set for repeaters, it uses as a synchronizing signal of its own set, and monitors a synchronizing signal (step 30, step 40). If it is a slave, a synchronization signal is received from the master repeater set, and the reception state of the synchronization signal is monitored (steps 20 and 40). When the synchronization signal being monitored stops, it communicates with another repeater set again to determine the relationship between the master and slave. If it is a master, the process returns to step 30 (step 50, step 60). If it is a slave, it returns to step 40 (step 60).

  As described above, according to the present invention, since a plurality of repeater sets constituting a repeater detect a failure of a master repeater set and automatically switch to a new master, the failure time due to a repeater synchronization signal is ignored. This makes it possible to improve the operational efficiency of wireless communication because it is not necessary for the administrator to recover from the failure by the synchronization signal.

The circuit block diagram which shows the structure of the synchronous automatic switching apparatus by this invention. The timing chart which shows the counting procedure of the internal clock of this invention. The flowchart which shows the synchronous signal automatic switching method of this invention. The block diagram which shows the structure of the repeater by the set for several conventional repeaters.

Explanation of symbols

1 Sub CPU
2 First MPU
3 Second MPU
4 VCXO
5 First switch
6 Second switch
7 Synchronous signal driver / receiver
8 Sync signal connector
9 Main CPU
10 LAN connection
11 Ethernet connector 100 Repeater set 110 Repeater set (master)
120, 130, 140, 150 Repeater set (slave)
111, 121, 131, 141, 151 DIP switch 112, 122, 132, 142, 152 PC connection port 200 Repeater

Claims (4)

A synchronization signal automatic switching device for automatically switching the synchronization signals of a plurality of repeater sets constituting a repeater,
Consists of main CPU, sub CPU, first MPU, second MPU, synchronization signal driver / receiver, first switch, second switch, and LAN connection unit,
In the initial setting of the repeater, the main CPU of the plurality of repeater sets communicates with the other plurality of repeater sets via the LAN connection unit, and determines a master or slave relationship to determine the sub CPU. Notify
If it is the master, the sub CPU outputs a synchronization signal from the first MPU to the other repeater sets via the synchronization signal driver / receiver, and the sub CPU via the second switch, Output to the first MPU and the second MPU;
If it is the slave, the synchronization signal is received from the master of the plurality of other repeater sets via the synchronization signal driver / receiver and the first switch, and the sub CPU, the first MPU, and the first switch are received. 2. A synchronous signal automatic switching device characterized by being input to 2MPU.   The sub CPU monitors the input synchronization signal, and determines that the master has failed when the synchronization signal stops, and the main CPU communicates with the other repeater sets via the LAN connection unit. 2. The synchronization according to claim 1, wherein a relationship between a master and a slave at the time of a failure is determined, and if the master is the master, the synchronization signal is output, and if the slave is the slave, the synchronization signal is received. Automatic switching device.   The synchronous automatic switching device according to claim 1 or 2, wherein the monitoring of the synchronization signal of the sub CPU is performed by counting the clock of the internal counter of the sub CPU using the synchronization signal as a trigger. . A synchronization signal automatic switching method for automatically switching a synchronization signal of a plurality of repeater sets constituting a repeater,
Determining the relationship between the master and the slave among the plurality of repeater sets in the initial setting of the repeater;
The master repeater set outputs a synchronization signal;
The slave repeater set receives the synchronization signal;
The plurality of repeater sets monitoring the synchronization signal and determining that the master repeater set is faulty when the synchronization signal stops;
Determining a relationship between a master and a slave at the time of failure between the plurality of repeater sets;
If the master, the step of outputting the synchronization signal;
And a step of receiving the synchronization signal if it is the slave.

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