JP2500755B2 - Redundant system switching method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a redundant system switching system, and more particularly to a redundant system switching system for digital transmission equipment.

[0002]

2. Description of the Related Art In a conventional redundant system switching system for a digital transmission device, all the alarms generated in each redundant system package are collected in a switching control unit, and the switching control unit performs priority processing by software to perform switching. It controls the operation.

[0003]

In this conventional redundant system switching system, an alarm is temporarily collected from the redundant system package to the switching control unit and then software processing is performed in the switching control unit, so that the alarm is collected. Since it is necessary to have a circuit and a software processing unit, there are problems that the circuit scale becomes large and that it takes time from the generation of an alarm to the control of the switching operation.

An object of the present invention is to provide a redundant system switching system by multi-valued level determination which solves the above problems.

[0005]

A redundant system switching system according to the present invention has a D / A conversion unit for inputting a plurality of alarm signals arranged in accordance with the priority order of switching operation, and a common unit to be selected. A plurality of packages each having a signal output; a comparison unit having inputs of outputs of respective D / A conversion units from the plurality of packages; an output of the comparison unit and respective selected signals from the plurality of packages; And a common unit having a switching unit that receives the selected signal based on the output of the comparison unit and outputs the selected signal as a selection signal.

[0006]

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. To simplify the description, the number of redundant packages is set to two as shown in the figure.

The first redundant system package 1 is provided with a D / A conversion unit 10, and the first, second and third alarm signals 4, 5 and 6 are switched to the first redundant system package 1. The first level output 12 is output after being arranged and input according to the priority order of the conditions, and D / A converted. The first level output has a voltage level proportional to the priority of the generated switching condition.

Similarly, the second redundant system package 2 is D
The second redundant package 2 including the A / A converter 11
, The first, second, and third alarm signals 7, 8, and 9 are arranged and input according to the priority order of the switching conditions, and D /
It is A-converted and outputs the second level output 13. The second level output has a voltage level proportional to the priority of the generated switching condition.

First and second redundant packages 1 and 2
From the first and second selected signals 16, 1 respectively.
7 is output.

The common section 3 comprises a comparison section 14 and a switching section 18.

The first and second level outputs 12 and 13 from the redundant packages 1 and 2 are provided to the comparison unit 14 of the common unit 3.
The comparison unit 14 compares the first and second level outputs, and outputs the larger level output to the switching unit 18 as a switching control signal 15.

First and second selected signals 16 and 17 are input to the switching unit 18. The switching unit 18 selects one of the selected signals based on the switching control signal 15,
The selection signal 19 is output.

[0014]

As described above, according to the present invention, the alarm signals in the redundant packages are D / A-converted according to the priority order, and the switching priority order between the redundant system packages is compared and determined as the voltage level. There is an effect that it is not necessary to have a collecting circuit and a software processing section, and it takes almost no time from the alarm issuance to the switching control.

[Brief description of drawings]

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

[Explanation of symbols]

 1, 2 Redundant system package 3 Common part 4, 5, 6, 7, 8, 9 Alarm signal 10, 11 D / A conversion part 12, 13 Level output 14 Comparison part 15 Switching control signal 16, 17 Selected signal 18 Switching Part 19 Selection signal

Claims (3)

(57) [Claims] 1. A D / A conversion section which receives as input a plurality of alarm signals arranged in accordance with the priority of switching operation, a plurality of packages having a selected signal output to a common section, and the plurality of packages. From which the output of each D / A conversion unit is input, and the output of the comparison unit and each selected signal from the plurality of packages as input, and selection based on the output of the comparison unit A redundant system switching system, comprising: a common unit having a switching unit that selects a signal and outputs it as a selection signal. 2. The plurality of alarm signals are arranged in accordance with the priority order of switching conditions and input to a D / A converter, and D / A
The redundant system switching system according to claim 1, wherein the output of the conversion unit has a voltage level proportional to the priority of the generated switching condition. 3. The redundant system switching system according to claim 2, wherein said comparison unit compares the voltage levels output from the D / A conversion unit and uses the larger output as a switching control signal.