JPH10271042A - Changeover system for radio equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a changeover system for an active/standby transmitter where channel interference is prevented on the occurrence of a fault in a radio equipment. SOLUTION: A radio equipment is made up of a terminal station equipment (multiplexer section) 11, active/standby transmitters 12, 13, an active/standby changeover device 14, and a controller 15 that monitors a state of each device and provides an output of a signal. On the occurrence of a fault in the active transmitter 12 by the supervision of the controller 15, the changeover device 14 is switched to the standby transmitter 13 and information is sent to the active transmitter 12 to interrupt transmission. When both the active/standby fransmitters 12, 13 are faulty or the multiplexer section 11 is faulty, information is sent to the active/standby transmitters 12, 13 to interrupt transmission.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a switching method of a wireless device equipped with two transmitting devices.

[0002]

2. Description of the Related Art FIG. 3 shows a system diagram of a radio apparatus provided with two working / standby transmitting apparatuses conventionally used. The transmitting device is provided with two working devices and three working devices, and the terminal device (multiplexing unit) 1 is constituted by one device. The transmitting device 2 of the active device and the transmitting device 3 of the standby device are connected to the antenna 6 by the switch 4. The switch 4 is switched by the controller 5.

The data input to the radio is multiplexed in a multiplexing unit 1 and transmitted from an antenna 6 via a transmitting device 2. The controller 5 constantly monitors the state of the active transmission device 2, and switches to the backup transmission device 3 instantaneously when an abnormality occurs in the active device 2 due to the alarm (ALM) judgment. When the working transmitter 2 is normal, the switch 4
The relay K1 is switched to the active device side, and the relay K2 is connected to the transmitting device 2. However, when an alarm occurs in the active transmitting device 2, the signal is switched by the monitoring of the controller 5 to the switch device 4.
In addition, the relay K2 is connected to the dummy side, the relay K3 is connected to the auxiliary transmission device 3, and the relay K1 is switched to the auxiliary transmission device 3.

[0004] The controller 5 also monitors the state of the backup transmitter 3, and when an alarm occurs in both the active and backup transmitters 2, 3, the relay K3 also falls to the dummy side, so that the line is disconnected. Become. The controller 5 also monitors the state of the terminal device 1, and when an alarm occurs, both relays K
2, K3 falls to the dummy side and the line is disconnected.

[0005]

As described above, in a conventional wireless device composed of two transmitting devices, an active device and a standby device, and one terminal device, a line disconnection caused by a device failure occurs. There is a disadvantage that the number of times is extremely large.

[0006] The object of the present invention is to provide an active / standby machine.
It is an object of the present invention to provide an active / standby switching method for reducing a line disconnection rate in the event of a device failure in a wireless device including one transmitting device and one terminal device.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to monitor the status of a terminal device and two transmission devices and, when an alarm is generated in one of the transmission devices, a transmission device in which an alarm is not generated in a switch. Control to output a switch-off signal to the transmitting device in which an alarm has occurred, and to output transmission cut-off information to two transmitting devices when an alarm has occurred in two transmitting devices or terminal devices. This is achieved by providing means.

According to the above means, even if an alarm occurs in the transmitting device or the terminal device, the line is not disconnected,
It is only necessary to switch to a transmission device that does not generate an alarm, and to add a transmission disconnection information to the transmitting device that has generated an alarm to make a transmission disconnection. Then, by continuing the state monitoring, the transmission can be restored instantaneously when it becomes normal. As a result, the frequency of line disconnection at the time of failure is reduced, and transmission efficiency can be increased.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a system diagram of a wireless device according to an embodiment of the present invention. Two active transmitters 12, a standby transmitter 13, one terminal device (multiplexing unit) 11, an active / standby switch 14, a controller for monitoring the status of each device and outputting a switch signal 15 is comprised.

The controller 15 constantly monitors the statuses of the transmitting device 2 of the active device, the transmitting device 3 of the standby device, and the multiplexing unit 11 of the terminal device, and switches when an error occurs in the active transmitting device 2. It outputs a signal and switches to the standby transmission device 3 instantaneously.
For the switching, a switching signal is transmitted from the controller 15 to the switching unit 14, and information of the transmission interruption is transmitted to the control input of the transmitting device 12, 13 in which the abnormality has occurred, thereby controlling the transmission interruption and the line switching.

The controller 15 receives ALM information from each of the transmitting devices 12 and 13 and the multiplexing unit 11 and receives AND1 and AN1.
Information is input to the ALM determination unit 15a from a logic circuit including D2, OR1, OR2, and NOT, and the ALM
It makes a determination and outputs a switching signal based on the determination result.

FIG. 2 is a table for explaining the function of ALM determination based on information of the controller 15. The controller 15 constantly monitors the status, and each of the transmitting devices 12, 13 and the multiplexing unit 11 receives a normal (OK) signal. ), Abnormal (NG) ALM information is input. In the case of the state, the working and protection transmitting devices 12 and 13
If both are OK, "0" information is input and the ALM determination unit 15a
When "0" is input from both OR1 and OR2, and the normality is determined, in this case, a switching signal for connecting the active transmitting device 12 is transmitted to the switching device 14, and information indicating that the standby transmitting device 13 will be disconnected is transmitted. send. The output information of the transmission interruption is “1” (the transmission OK information in this case is “0”).

In the case of the state, the active transmitting apparatus 12 inputs "1" as NG and the standby transmitting apparatus 13 inputs "0" as OK.
“1” is input from OR1 and “0” is input from OR2 to the LM determination unit 15a, and a switching signal for disconnecting the active transmission device 12 and connecting the protection transmission device 13 is output based on the determination result. If the active transmission device 12 returns to normal depending on the state, the active device is connected.

If both the working and protection transmitting devices 12 and 13 are NG as in the state, "1" is input, and the transmission of both the working transmitting device 12 and the protection transmitting device 13 is cut off. Becomes indefinite. NG of the multiplexing unit 11
In the case of (1), both the working and protection transmitting devices are in a transmission-disabled state. The output lines from the controller 15 to the respective devices are separated bundles. NOT and A
The feedback information to the ND 1 feeds back a control input to the active transmission device 12.

In the conventional circuit, when the multiplexing unit determines that there is an error, a switching signal for stopping transmission is sent to the switching unit to disconnect the line. In the present invention, however, the multiplexing unit is used to minimize disconnection of the line. When it is determined that there is an abnormality in the conversion unit 11, the transmission of each of the transmission units 12 and 13 of the active unit and the standby unit is cut off according to the control input information. By continuing the monitoring, when the multiplexing section 11 becomes normal, the better transmitting device (the working device when both the working and the protection devices are good) can be instantaneously selected and returned to resume the transmission.

[0017]

According to the above-described switching method of the present invention, the frequency of disconnection of the transmission line can be greatly reduced as compared with the conventional case. Thereby, transmission efficiency is improved.

[Brief description of the drawings]

FIG. 1 is a system diagram of an embodiment of the present invention.

FIG. 2 is an explanatory diagram of an ALM determination function in FIG. 1;

FIG. 3 is a conventional system diagram.

[Explanation of symbols]

11: multiplexing unit, 12: active transmitting device, 13: standby transmitting device, 14: switch, 15: controller, 16: Annate, 15a: ALM determining unit.

Claims (1)

[Claims] A terminal device to which data is input, two working and protection transmitting devices connected to the terminal device, and a switch for switching and connecting the two transmitting devices to an antenna. In the switching method of the wireless device provided, the state of the terminal device and the two transmitting devices is monitored, and when an alarm is generated in one of the transmitting devices, switching to a transmitting device in which the alarm is not generated in the switching device is performed. A control means for outputting a signal to the transmitting device in which an alarm has occurred to output information of transmission interruption, and outputting information of transmission interruption to two transmitting devices when an alarm has occurred in two transmitting devices or terminal devices. A switching method for a wireless device, which is provided.