JP3068585B1 - Hot standby system with transmission output control function - Google Patents

Abstract

In a hot standby system, when a high output is transmitted due to an equipment failure of an output controller that controls the output of a transmitter, switching of the transmitter from a working to a standby system is not performed, and nonlinearity due to the high output is not performed. Deterioration of characteristics and interference with other circuits occur, and transmission quality deteriorates. SOLUTION: An H for dividing a signal received by a receiving side into two parts.
YB7, receivers 8 and 9 for receiving the distributed signals, and level detectors 10 and 11 for detecting the reception levels of the receivers 8 and 9 and transmitting the information signals to the output controllers 3 and 4 on the opposite side. Transmitters 1, 2 with variable transmission output on the transmission side
And output controllers 3 and 4 for transmitting a control signal based on information from the level detectors 10 and 11 and transmitting a switching signal 13 or 14 when a control signal for transmitting a maximum output value is transmitted for a certain period of time. , A switching controller 5 for monitoring output lowering alarms of the transmitters 1 and 2 and transmitting a switching signal 12
And a switch 6 for switching the outputs of the transmitters 1 and 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot standby system having a transmission output control function in a microwave communication apparatus, and more particularly to a case where a transmission output is controlled to a maximum output value within a control range for a predetermined time. The present invention relates to a hot standby system capable of controlling transmission output, wherein a switching signal is transmitted from an output controller to a switch and the operation is switched to a standby system.

[0002]

2. Description of the Related Art Conventional communication systems employing a hot standby system having a transmission output control function are disclosed in, for example, JP-A-6-216788 and JP-A-6-291.
Japanese Patent Application Laid-Open Nos. 698, 8-251141, 10-276120, and the like have proposed techniques.

As shown in FIG. 6, the techniques described in each of the above publications commonly include a HYB 7 for distributing a signal received by a receiving side into two parts, and an active and a spare for respectively receiving the distributed signal. Receivers 8 and 9 and working and protection level detectors 10 and 11 for detecting reception levels of the receivers 8 and 9 and sending information signals to working and protection output controllers 3 and 4 on the opposite side. And a transmitter 1 or 2 having a variable transmission output on the transmitting side, and a transmitter 1 or 2 based on a signal from a level detector 10 or 11 of the opposite station.
Output controllers 3 and 4 for transmitting a control signal for controlling the transmission output of the transmitter, and a switching controller 5 for monitoring an output reduction alarm (transmission alarm) of the transmitters 1 and 2 and transmitting a switching signal.
And a switch 6 for switching the outputs of the working and backup transmitters
And

[0004]

However, the switching unit 6 switches between the working transmitter and the backup transmitter according to the switching signal 12 from the switching controller 5.
When high output is transmitted due to equipment failure of the output controller, switching of the transmitter from the working to the standby system is not performed,
Deterioration of nonlinear characteristics due to high output and interference with other lines occur, and transmission quality deteriorates.

[0005] Further, at the time of up-fading, there is a fear that a device failure of the receiver or the like may occur.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and has been made in order to solve the above-mentioned drawbacks inherent in the prior art. In this case, the switching of the transmitter from the working system to the standby system is not performed, and it is possible to prevent the deterioration of the nonlinear characteristics due to the high output, the interference with other lines, and the deterioration of the transmission quality beforehand. To provide a new hot standby method.

[0007]

In order to achieve the above object, a hot standby system having a transmission output control function according to the present invention is a hot standby system having a transmission output control, wherein the transmission output of the transmitter is reduced. When the maximum output value within the control range of the transmitter is controlled for a certain period of time, a switching signal is sent from the output controller that controls the output of the transmitter to the working / standby switch to switch the operation to the standby system. It is characterized by:

[0008] The hot standby system having the transmission output control function according to the present invention further comprises a distributor for dividing a signal received on the receiving side into two, a working receiver and a protection receiver for receiving the distributed signal, respectively. A working and protection level detector for detecting the reception levels of the working and protection receivers and transmitting an information signal to the working and protection output controllers on the transmission side, and enabling the transmission side to vary the transmission output When a control signal is transmitted based on information from the active and backup transmitters and the level detectors on the receiving side, and the transmitter transmits a control signal for transmitting a maximum output value for a certain period of time, A current and standby output controller having a function of transmitting a first switching signal, a switching controller for monitoring a power reduction alarm of each of the transmitters, and transmitting a second switching signal; Constructed and a switch for switching the output of said working and protection of the transmitter based on the second switching signal.

The switching unit receives a signal line of two first switching signals on the working side and a protection side and selects and outputs a signal line of the first switching signal which is always in operation, and the selection circuit. An OR circuit for inputting a signal line of a switching signal on the working side and a signal line of the second switching signal output from the first circuit, and the first circuit which is operated by the output of the OR circuit and the selection circuit is always in operation
A drive circuit for supplying a control signal for controlling the selection of the signal line of the switching signal to the selection circuit, and a switch circuit for switching the outputs of the working and backup transmitters in accordance with the switching signal from the drive circuit And

[0010] A timer measures the fixed time during which the working and backup output controllers send control signals to each of the transmitters so that each of the transmitters sends the maximum output value.

[0011]

Next, preferred embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a hot standby system having a transmission output control function according to the present invention, and FIG. 2 is an embodiment of a switch for switching the outputs of a working transmitter and a backup transmitter. It is a block diagram showing an example.

[Structure of Embodiment] Referring to FIGS. 1 and 2, in one embodiment of the present invention, a receiving side receives HYB 7 which divides a received signal into two, and receives each of the divided signals. Working and protection receivers 8 and 9, and working and protection level detectors for detecting the reception levels of the receivers 8 and 9 and transmitting information signals to the working and protection output controllers 3 and 4 on the opposite side. 10 and 11, while transmitting and receiving a control signal based on information from active and standby transmitters 1 and 2 whose transmission outputs can be varied, and level detectors 10 and 11 on the opposite side, and a maximum output. When a control signal for transmitting a value is transmitted for a predetermined time, the switching signal 1
Current and standby output controllers 3 and 4 having a function of transmitting 3 or 14; a switching controller 5 for monitoring the output reduction alarm (transmission alarm) of the transmitters 1 and 2 and transmitting a switching signal 12; And a switch 6 for switching the output of the spare transmitters 1 and 2.

The working and protection output controllers 3 and 4 are connected to the working and protection transmitters 1 and 2 respectively.
Sends a control signal for transmitting the maximum output value for a certain period of time, which can be set by, for example, a timer.

As shown in FIG. 2, the switching unit 6 includes a selection circuit 20 that outputs a switching signal from an operating output controller in response to a selection signal 22 from the driving circuit 18, and a switching circuit 5 that outputs a switching signal from the switching controller 5. An OR circuit 17 that receives the switching signal 12 and the output of the selection circuit 20 as inputs, a driving circuit 18 that operates by an output signal of the OR circuit 17, and a SW 19 that performs switching by a switching signal 21 from the driving circuit 18. ing.

[Operation of the Embodiment] Next, the operation of the embodiment according to the present invention will be described with reference to FIGS.

According to signals from the opposing level detectors 10 and 11, a 2-bit digital control signal as shown in the table of FIG.
In FIG. 3, "A" in FIG. 3 has a low reception level, a control signal "10" is sent from the output controllers 3 and 4, and the maximum output value (for example, " +30 dBm "), the state of" C "in FIG. 3 indicates that the opposite reception level is high, the control signals" 00 "are sent from the output controllers 3, 4, and the transmitter outputs the minimum output of the controllable range. A value (for example, “+20 dBm”) is output, and the control signal “01” is transmitted from the output controllers 3 and 4 at “B”, which is an intermediate reception level between “A” and “B”. The intermediate output value (for example, “+
25 dBm ").

When the state of FIG. 3A continues for a predetermined time (for example, 90 seconds), a switching signal is transmitted from the output controllers 3 and 4.

At this time, the transmitter 1 is set to the operating state, the control signal 15 of "01" is transmitted from the output controller 3 by the signals of the level detectors 10 and 11 of the opposite station, and "+25 dBm" is transmitted from the transmitter 1. Consider the case where the data is output (state "B" in FIG. 3).

However, the control signal 15 of "10" is transmitted from the output controller 3 due to the equipment failure of the output controller 3, and the transmitter 1 outputs "+3" which is the maximum output value in the controllable range.
0 dBm ”(“ A ”state in FIG. 3) for 90 seconds, the output controller 3 outputs the switching signal 13 as described above.
To the switch 6.

A selection circuit 20 provided inside the switch 6
In order to select and output the switching signal on the operation side according to the selection signal 22 from the driving circuit 18, the switching signal 13 is output from the selection circuit 20, and the switching signal 13 is output from the OR circuit 17. Since the circuit 18 operates and the switching signal 21 is output, the SW 19 is controlled by the normal control signal 16 of “01” from the output controller 4 and “+25”.
The switching is performed to the backup-side transmitter 2 that outputs dBm ″.

On the other hand, when the output of the transmitter 1 is cut off, the transmitter 1 sends a transmission alarm to the switching controller 5, and a switching signal 12 is sent from the switching controller 5 to the switching device 6.
Since the switching signal 12 is output from the OR circuit 17 of the switch 6, the drive circuit 18 operates and switches the SW 19 to the backup transmitter 2 to output the switching signal 21.

Next, the operation of the embodiment according to the present invention will be described with reference to a flowchart and a timing chart.

FIG. 4 is a flowchart showing an operation flow example of one embodiment of the present invention, and FIG. 5 is a timing chart showing an operation example of one embodiment of the present invention.

Referring to FIGS. 1, 2, 4 and 5, it is first assumed that the transmitter 1 is in an operating state.

First, in step S1, it is determined whether or not the switching signal 13 has been output from the output controller 3.

As a result of the determination in step S1, the switching signal 13
Is output, the switching signal 13 on the operating side is output from the selection circuit 20 by the selection signal 22 from the drive circuit 18 in step S2.

The switching signal 13 is supplied to the OR circuit 1 in step S3.
7 and output from the OR circuit 17 as it is.

The timing chart of FIG. 5 shows a case where the switching signal 12 is generated at the same time as the switching signal 13. The switching signal 12 and the switching signal 13 may be generated at the same time. Occurs at different times.
In the timing chart of FIG. 5, the switching signal 14 is generated before the switching signal 13 is generated. However, in this embodiment, the transmitter 1 is in the operating state and the transmitter 2 is not in the operating state. The switching signal 1 from the selection circuit 20 in FIG.
4 is not output.

In step S3, the OR circuit 17
In step S4, the drive circuit 18 operates according to the switching signal 13 output from the switch circuit SW1 shown in FIG.
In addition to transmitting the switching signal 21 to the switching signal 9, the selection circuit 20 outputs a selection signal 22 that outputs the switching signal 14 instead of the switching signal 13.

Next, in step S5, the switching signal 2
The output of SW19 is switched to the transmitter 2 side by 1.

In the timing chart of FIG. 5, it can be seen that the switching signal 21 and the selection signal 22 have the same pulse waveform. Therefore, the signal line of the selection signal 22 of the drive circuit 18 of FIG.
Is supplied to the selection circuit 20, whereby the switching signal 13
And 14 can be configured to be selected as needed.

Returning to the previous step, as a result of the determination in step S1,
If the switching signal 13 is not output from the output controller 3, the process proceeds to step S6, and the switching signal 1 is output from the switching controller 5.
It is determined whether 2 is output.

As a result of the determination in step S6, the switching signal 12
Are output, steps S3, S4, S5
Then, the same processing as when the switching signal 13 is output is executed, and the processing ends.

As a result of the determination in step S6, the switching controller 5
Does not output the switching signal 12, the process proceeds to steps S7, S8 and S9, where no output is generated from the OR circuit 17, the driving circuit 18 does not operate, and the switching signal 21 is not output. The selection signal 22 holds the current state,
The output of SW19 ends while the transmitter 1 is held.

The above is the operation flow in the case where the transmitter 1 is in the operating state, but the same processing is performed when the transmitter 2 is in the operating state.

[Other Embodiments] The present invention is not limited to the above embodiment. For example, if the state of "A" in FIG. The output controller forcibly sends a control signal of "00" such as "C" in FIG. 3 for a certain period of time (for example, 100 seconds) in order to judge whether the control is normal according to the line state such as fading or the like. The minimum output value of the controllable range is "+ 25d
Bm "is transmitted and the system returns to the automatic control state after 100 seconds.

Here, the reception level of the opposing receivers 8 and 9 is kept low for 110 seconds due to the fading of the line, and the control signal 15 of "10" is transmitted from the output controller 3,
It is assumed that the transmitter 2 outputs “+30 dBm”. This control is normal, but if the state of “A” in FIG. 3 as described above continues for 90 seconds, the output controller 3 sets the output controller 3 for 100 seconds to determine whether the control is due to equipment failure or normal control. FIG.
And transmits a control signal of “00” such as “C” of the transmitter 1
, A low output of “+20 dBm” is transmitted, so that the transmission quality deteriorates.

In the case of the present invention, when the state of "A" in FIG.
After the switching signal 13 is sent out from the active side and the state of “A” in FIG.
The state of "A" in FIG. 3 is continued for 20 seconds on the standby side, and after that, control according to the line state is performed on the standby side.
Prevent degradation of transmission quality due to low output for 00 seconds.

[0040]

As described above, according to the present invention, when high output continues for a certain period of time due to a failure of the output controller, a switching signal is sent from the output controller to the switch to switch the transmission output to the standby system. Accordingly, there is an effect that deterioration of nonlinear characteristics due to high output and deterioration of transmission quality due to interference with other lines are prevented.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment according to the present invention.

FIG. 2 is a block diagram showing an embodiment of a switch shown in FIG. 1;

FIG. 3 is a correspondence table of a transmission output of a transmitter to a control signal of an output controller.

FIG. 4 is a flowchart illustrating an example of an operation flow of the present invention.

FIG. 5 is a timing chart illustrating the operation of the present invention.

FIG. 6 is a block diagram showing a conventional example.

[Explanation of symbols]

 Reference numerals 1, 2, transmitter 3, 4, output controller 5, switch controller 6, switch 7, HYB 8, 9, receiver 10, 11, level detector 17, OR circuit 18, drive circuit 19, switch circuit 20 ... Selection circuit

Claims (3)

(57) [Claims] 1. In a hot standby system having a transmission output control function, a signal received on a receiving side
A distributor for distributing, working and protection receivers for receiving the distributed signals, and receiving information levels of the working and protection receivers to provide working and protection output controllers on the transmitting side with information signals. Active and backup level detectors, which can change the transmission output on the transmission side, and transmit control signals based on information from the respective level detectors on the reception side. A working and standby output controller having a function of transmitting a first switching signal when each of the transmitters transmits a control signal for transmitting a maximum output value for a certain period of time; and an output reduction alarm of each of the transmitters. A switching controller that monitors the first switching signal and sends a second switching signal;
Or a switch for switching the outputs of the working and backup transmitters based on a second switching signal, wherein the transmission output of the transmitter is controlled to a maximum output value within a controllable range of the transmitter for a fixed time. A transmission output control function characterized by transmitting the first switching signal from the output controller that controls the output of the transmitter to the working and protection switching device to switch the operation to the protection system. Hot standby system. A selector circuit for inputting two signal lines of a first switching signal on a working side and a protection side and selecting and outputting a signal line of a first switching signal which is always in operation; A signal line for a working-side switching signal output from the selection circuit and the second
An OR circuit for inputting the signal line of the switching signal, and a control signal that operates by the output of the OR circuit and controls the selection circuit to select and output the signal line of the first switching signal that is always in operation. 2. The transmission output control according to claim 1, further comprising: a driving circuit to be supplied to the selection circuit; and a switch circuit for switching an output of the working and standby transmitters according to a switching signal from the driving circuit. Hot standby system with functions. 3. The system according to claim 2, wherein the working and backup output controllers measure a fixed time for sending a control signal to each of the transmitters such that each of the transmitters sends a maximum output value, using a timer. A hot standby system having the transmission output control function according to claim 1.