JP3019775B2 - Hot standby communication method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot standby communication system having transmission output control in a microwave communication device.

[0001]

2. Description of the Related Art Conventionally, in a hot standby communication system having transmission output control, as shown in FIG. 3, a HYB 6 for distributing a signal received by a receiving side into two and a working and standby receiver 7 for receiving the distributed signal respectively. , 8 and a level detector 9 for detecting the reception level of the receiver and transmitting an information signal to the output controller 3 of the opposite station. 2 and an output controller 3 for transmitting a control signal for controlling the transmission output of the transmitter based on a signal from the level detector 9 of the opposite station, and a device failure alarm (transmission alarm) of the transmitters 1 and 2 is monitored. Switching signal 1
And a switch 5 for switching the outputs of the working and protection transmitters 1 and 2 in accordance with the switching signal 1 from the switching controller 4 to switch between the working and protection transmitters 1 and 2. This is performed by the switching signal 1 from the switching controller 4.

[0002] Such a conventional technique is described in, for example, JP-A-07-86989.

[0003]

However, in the above-mentioned hot standby communication system having the conventional transmission output control function, when the control signal of the output controller and the actual transmission output corresponding thereto are different and a high output is transmitted, the transmission is performed. Since the alarm is not activated and the transmitter is not switched from the working system to the standby system, the non-linear characteristic is degraded due to the high output and interference with other lines is caused to deteriorate the transmission quality.

According to the present invention, deterioration of nonlinear characteristics due to high output and deterioration of transmission quality due to interference with other lines are prevented, thereby improving the reliability and maintainability of the microwave communication apparatus.

[0005]

In the hot standby communication system having a transmission output control function according to the present invention, the active and standby transmitters are switched by a switching signal from an output controller and a switching controller. Specifically, when the transmission alarm is not activated, but the control signal from the output controller and the actual transmission output corresponding thereto are different and a high output is transmitted, the working and backup transmitters are switched by the switching signal from the output controller. Switch.

[0006] By switching between the working transmitter and the backup transmitter according to the switching signal from the output controller, deterioration of nonlinear characteristics due to high output and deterioration of transmission quality due to interference with other lines are prevented.

[0007]

FIG. 1 is a block diagram showing an embodiment of a hot standby communication system having a transmission output control function according to the present invention.

[0008] HY for distributing a signal received by the receiver to two
B6 and working and backup receivers 7 and 8 for receiving the distributed signals, and a level detector 9 for detecting the reception level of the receiver and transmitting an information signal to the output controller 3 of the opposite station. And a control signal for controlling the transmission output of the transmitter 1 or 2 based on signals from the active and standby transmitters 1 and 2 whose transmission output is variable and the level detector 9 of the opposite station. The output controller 3 having a function of monitoring the transmission output of the transmitter and activating an answerback alarm and transmitting a switching signal when the control signal and the actual transmission output corresponding thereto are different, and the output lowering alarm of the transmitters 1 and 2 (transmission Alarm) and a switching controller 4 for transmitting a switching signal and a switching unit 5 for switching the outputs of the working and standby transmitters. The switching unit 5 switches between the output controller 3 and the switching controller 4. By issue 51 implementing the switching of the working and protection of the transmitter.

The operation of the embodiment of the present invention will be described in more detail with reference to the drawings.

In FIG. 1, it is assumed that a control signal as shown in Table 1 is supplied from the output controller 3 by a signal from the level detector 9 of the opposite station. Also, when the trigger point of the transmission alarm due to the equipment failure of the transmitters 1 and 2 is lower than the normal value by 3 dB or more, the answerback alarm which is triggered when the control signal from the output controller 3 differs from the actual transmission output corresponding thereto Let the point deviate from the normal value by 3 dB or more.

For example, the control signal shown in Table 1 "B" is sent from the output controller 3 to the working transmitter 1, but when the actual transmission output is in the state "A", the transmission output is 5 dB higher than the normal value. An answerback alarm that is activated at a deviation of 3 dB from the normal value is activated, but a transmission alarm that is activated at a value 3 dB lower than the normal value is not activated. In the prior art, a switching signal 51 from a switching controller 4 monitoring a transmission alarm is provided.
The switch 5 switches between the active transmitter 1 and the standby transmitter 2 only by the switch, so that the active transmitter 1 does not switch to the standby transmitter 2 and a high output is transmitted from the active transmitter 1. On the other hand, in the case of the present invention, as shown in FIG. 2, the switching unit 5 outputs the switching signal 51 from the switching controller 4 and the switching signal 52 from the output controller 3 in response to the activation of the answerback alarm. , The drive circuit 11 is operated to switch the SW 12 between the active and standby transmitters 1 and 2. Therefore, in the above state, the drive circuit 11 is operated by the switching signal 2 and S
W12 switches the transmission output from the active transmitter 1 to the standby transmitter 2.

[0012]

As described above, when the control signal of the output controller and the actual transmission output corresponding thereto are different and a high output is transmitted, an answerback alarm is activated and a switching signal is transmitted to the switch to transmit the transmission output. By switching to the backup transmitter, it is possible to prevent the deterioration of the nonlinear characteristic due to the high output and the deterioration of the transmission quality due to the interference with other lines.

[Brief description of the drawings]

FIG. 1 is a block diagram of a hot standby communication system having a transmission output control function according to the present invention.

FIG. 2 is a block diagram showing a configuration of a switch 5 of FIG.

FIG. 3 shows a conventional hot standby communication system having a transmission output control function.

[Explanation of symbols]

 1, 2 transmitter 3 output controller 4 switching controller 5 switch 6 hybrid (HYB) 7, 8 receiver 9 level detector 51, 52 switching signal 10 OR gate 11 drive circuit 12 switch

Claims (2)

(57) [Claims] 1. A hybrid (HYB) for distributing a received signal to two receivers.
Working and backup receivers each receiving the distributed signal, and a level detector for detecting a reception level of the receiver and transmitting an information signal to an output controller of the opposite station; Working and backup transmitters with variable transmission output, and a control signal for controlling the transmission output of the transmitter by a signal from the level detector, further monitoring the actual transmission output, and An output controller having a function of activating an alarm and transmitting a switching signal when the actual transmission output is different from the actual transmission output; a switching controller monitoring a device failure alarm of the transmitter and transmitting a switching signal; A hot-standby communication system comprising: a controller; and a switching unit that switches the outputs of the working and standby transmitters according to a switching signal from the switching controller. 2. The hot standby communication method according to claim 1, wherein the hot standby method is used for a microwave communication device.