JPH01240022A - High speed switching device for radiocommunication circuit - Google Patents

Abstract

PURPOSE:To reduce the passing loss of a spare circuit direction, to make the title device economical and to execute non-instantaneous cutting switching by providing a separate-switching circuit to switch-output the signal of a spare circuit in a testing signal detecting circuit direction and in a high speed switching circuit and a high speed switching circuit to execute the switching of the signal from a living circuit and the signal of the spare circuit and executing the non-instantaneous cutting switching of the living circuit and the spare circuit. CONSTITUTION:A high speed switching device 3 select-outputs a signal inputted from a living circuit through a U-B converting circuit 4 as an output signal when the living circuit is normal. When the fault of the living circuit is generated, the switching action of respective switching circuits 1 and 2 is executed, and the switching of a receiving side is executed at a high speed. Thus, the signal inputted from the spare circuit through the U-B converting circuit 4 flows in an (a) to (b) direction in a separate- switching circuit 2, flows in the C to B direction in a high speed switching circuit 1, and goes out as the output signal. Consequently, when the fault is generated at the living circuit, non-instantaneous cutting switching from the signal of the living circuit to the signal of the spare circuit can be executed.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is a bipolar signal stage on the receiving end side of a wireless communication line, and is used for high-speed switching of a wireless communication line in which a signal on a working line is switched to a signal on a protection line without momentary interruption. Regarding equipment.

``Prior art'' For example, in a digital wireless communication line of N, a device that performs high-speed switching between a working line and a protection line at the receiving end is equipped with a preliminary test signal when switching the line at the receiving end. It is required to reduce the directional passing loss.

Conventionally, on the receiving end side of such 1:N digital wireless communication lines, switching devices using high-speed switching elements such as FETs have been used to perform instantaneous switching at the bipolar signal stage. .

However, this high-speed switching device has a problem in that, in addition to the conventional coaxial switching device that causes instantaneous interruption, the signal transmission loss is large.

In addition, in a digital wireless communication line of N, the signal passing loss of the preliminary test system increases as N increases.
In the conventional high-speed switching device described above, there is a problem that a large level difference occurs between the signal of the current system and the preliminary test signal system, which is extremely undesirable as a switching configuration for a digital wireless communication line.

For this reason, in the conventional high-speed switching system, a bipolar signal amplifier or the like is installed in the middle of the preliminary test signal system to reduce the difference in signal level between the working system and the backup system.

However, such a conventional system is uneconomical in that it requires an extra amplifier, and furthermore, this amplifier becomes a factor that reduces the reliability of the entire system.

[Problems to be Solved] The great invention was made in view of these conventional problems, and its purpose is to improve the passage of the preliminary test signal direction without using an amplifier etc. in the middle of the preliminary test signal system. An object of the present invention is to provide a high-speed switching device for wireless communication lines that can reduce losses.

[Means for Solving Problems] In order to achieve the above object, the present invention provides a high-speed switching device that performs instantaneous interruption switching between a working line and a protection line at a bipolar signal stage on the receiving end side of a wireless communication line. A separation switching circuit that switches and outputs the line signal in the direction of the test signal detection circuit and the high-speed switching circuit, and a high-speed switching circuit that switches between the signal from the working line and the signal of the protection line that is switched and output from the separation switching circuit. The circuit includes a circuit, and is configured to perform instantaneous switching between the working line and the protection line.

[Example] Next, preferred embodiments of the present invention will be described based on the drawings.

FIG. 2 shows an example of a 1:N digital wireless line using the high-speed switching system according to the present invention. In the figure, 3 is a high-speed switching device, 4 is a U-B conversion circuit, and 5 is a high-speed switching device. A test signal detection circuit, and 6 a test signal generation circuit.

FIG. 1 shows a specific configuration of the high-speed switching device 3 shown in FIG. Each represents a preliminary direction.

The high-speed switching circuit 1 normally has A and B connected to selectively output signals from the working line, and when a failure occurs, C and B are connected and the separation switching circuit 2 Select and output the output signal.

In addition, in the division riddle selection circuit 2, normally A and C are connected,
It is formed so that A and B are connected when a failure occurs.

The present embodiment has the above configuration, and its operation will be explained next.

First, assume that the current line is operating normally.

In this case, high-speed switching port l? A and B are connected to 81, and a and C are connected to separation switching circuit 2. Therefore, the signal input from the current direction 7 through the U-B converter circuit 4 passes through the high-speed switching circuit 1 in the A-+B force direction and exits as an output signal.

At this time, the signal input via the U-B conversion circuit 4 of the protection line passes through the separation switching circuit 2 in the a-c direction,
Continuously connected, test signal detection port l? Sent to 35.

In this way, the high-speed switching device 3 of this embodiment selectively outputs the signal inputted from the working line via the U-B conversion circuit 4 as an output signal when the working line is normal. That will happen.

Next, assume that a failure occurs in the working line. In this case, first, the separation switching circuit 2 switches from a-+c to a→b.
Then, high-speed switching circuit 1 or A-B to C-
Switch to B.

In this way, the high-speed switching device 3 of this embodiment performs switching operations on each of the switching circuits 1 and 2 when a fault occurs in the working line, and switches on the receiving end side at high speed. The signal input via the U-B conversion circuit 4 flows in the separation switching circuit 2 in the direction a→b, and then passes through the high-speed switching circuit 1.
The signal flows in the C-4B direction and exits as an output signal.

In this way, according to the embodiment, when a failure occurs in the working line, it is possible to perform instantaneous interruption switching from the working line signal to the protection line signal.

Note that this embodiment is not limited to the above embodiment, and various modifications can be made within the scope of the gist of the present invention.

For example, in the embodiments described above, a digital radio circuit has been described as an example, but the present invention can also be applied to an analog radio circuit.

[Effects of the Invention] As explained above, according to the present invention, a separation switching circuit is used to switch the signal on the protection line to the test signal detection circuit and the high-speed switching circuit, and moreover, the signal from the working line to the protection line is switched from the working line to the protection line. By using a high-speed switching circuit for switching, it is possible to switch from the working line to the protection line without installing a bipolar signal amplifier etc. in the middle of the preliminary test signal system, and as a result, the passing loss in the direction of the protection line can be reduced. This has the advantage that it is possible to construct a wireless line that is economical and capable of switching without interruption.

[Brief explanation of the drawing]

FIG. 1 is a block circuit diagram 1 showing a preferred example of a high-speed switching device for wireless communication lines according to the present invention, and FIG. 2 is a 1:N digital wireless line configured using the high-speed switching device of FIG. 1. FIG. 1: High-speed switching circuit 2: Separation switching circuit 3: High-speed switching device 5: Test signal detection circuit 6: Test signal generation circuit 7: Working direction 8: Reserve direction

Claims (1)

[Scope of Claim] In a high-speed switching device that performs instantaneous disconnection switching between a working line and a protection line in a bipolar signal stage on the receiving end side of a wireless communication line, the signal of the protection line is switched in the direction of a test signal detection circuit and at high speed. a separation switching circuit that switches and outputs in the switching circuit direction; and a high-speed switching circuit that switches between a signal from the working line and a protection line signal that is switched and output from the separation switching circuit. A high-speed switching device for a wireless communication circuit, characterized in that it performs instantaneous switching between a wireless communication circuit and a wireless communication circuit.