JPH04258026A - Active/standby line matrix changeover system - Google Patents

Abstract

PURPOSE:To reduce the gate delay time and the quantity of the hardware with respect to the active/standby line matrix changeover system for a receiver side of the digital multiplex radio system. CONSTITUTION:The system is provided with a logic conversion means 10 converting a control signal controlling a standby line into a control signal controlling an active line and selection means 21-2n selecting one of plural standby lines #1-#n and outputting a signal by the designation of the logic conversion means 10. Then the control signal controlling a standby line sent from a sender side is converted into the control signal controlling an active line by the logic conversion means 10 and the control signal controls the selection means 21-2n to select one of data for the plural standby lines 1-n and to output the data as an active line data thereby switching a matrix line.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a working/protection line matrix switching system on the receiving side of a digital multiplex radio system. In a digital multiplex radio system, m protection lines are generally prepared for n working lines, and when a failure occurs in the working line, communication is continued by switching to the protection line.

[0002] In this switching between working lines and protection lines, the working lines and protection lines do not have a one-to-one correspondence, but matrix switching is performed so that n working lines can be arbitrarily connected to m protection lines. ing.

FIG. 4 is a diagram illustrating line switching in digital multiplex radio. The figure shows an example of three working lines and three protection lines, and for the three working lines 01, 02, and 03,
There are three protection lines 01A, 02A, and 03A, and during normal operation, transmitting side #1, #2, and #3 are transmitting side matrix 2.
The signals pass through as is and are output to #1, #2, and #3 on the receiving side.

[0004] When a line failure occurs, one of the protection lines 01A, 02A, and 03A is
One is arbitrarily selected and connected, and on the receiving side, the intersection of the matrices corresponding to that line is closed using matrix 1, and the output is output to any of the switches 31 to 33 on the receiving side.

For example, if the working line 02 becomes faulty and communication is performed using the protection line 01A, matrix 1
, the intersection of the ☆ marks in matrix 2 is closed. In such switching between the working line and the protection line, there is a need for a matrix switching system that can minimize delays in the main data system even when the protection line is used.

[0006]

2. Description of the Related Art FIG. 5 is a diagram illustrating a conventional example. 12 in the figure is a control circuit, 21a to 21c, 22a to 22c,
23a to 23c are selectors, and 21d to 23d are logical sum circuits (hereinafter referred to as OR circuits).

[0007] In the above configuration, the control signal sent from the transmitting side is ``Connect backup #〇〇 to working #〇〇.
The control circuit 12 closes the selector corresponding to the control signal.

For example, in the case of control such as "Connect backup #1 data to current #2 data", the selector 21b in the figure
is turned on, all other selectors are turned off, and the preliminary #1 data that has passed through the selector 21b is sent to the OR circuit 22d.
The data is output as current #2 data.

[0009]

[Problems to be Solved by the Invention] In the above-mentioned conventional example, in order to connect data on a designated protection line to data on a designated working line, it is necessary to pass through one stage of selector and one stage of OR circuit. ,When the data rate is high, errors may occur due to ,gate delays. Furthermore, the required number of selectors for selecting the current data to be connected for each backup data is "number of backup lines x number of current lines", which increases the amount of hardware.

The present invention attempts to realize a working/protection line matrix switching system with a small gate delay time and a small amount of hardware.

[0011]

Means for Solving the Problems FIG. 1 is a block diagram illustrating the principle of the present invention. 10 in the figure is a logic conversion means for converting a control signal for controlling the protection line into a control signal for controlling the working line, and 21 to 2n are logic conversion means 10.
It is a selection means that selects and outputs one of the plurality of input protection lines #1 to #n according to the specification of The conversion means 10 converts it into a control signal for controlling the working line, and the selection means 21 to 2n are controlled by the signal,
By selecting one of the multiple backup lines 1 to n data and outputting it as working line data to perform matrix line switching, gate delay is small and matrix switching can be performed with a configuration that requires a small amount of hardware. Become.

0012

[Operation] The control signal sent from the transmitting side to the receiving side is
Connect backup #〇〇 to working #〇〇.'' This control signal is input to the logic conversion means 10,
Convert it into a control signal that says "Connect standby #〇〇 to current #〇〇."

This control signal is input to the selection means 21 to 2n, and the selection means 21 to 2n select and connect one of the spare #1 to n data input in parallel, thereby making a selection. It becomes possible to perform matrix switching in one stage of means 21 to 2n.

[0014]

Embodiment FIG. 2 is a diagram illustrating an embodiment of the present invention. In this example, there are three working lines and three protection lines.
A read-only memory (hereinafter referred to as RO) is used as the logic conversion means 10.
M) 11, selection means 21 to 2n, 1/3
This is an example composed of selectors 21A to 23A.

FIG. 3 is a diagram illustrating the operation of the ROM according to the embodiment of the present invention. (A) is a control signal in the format of "Connect standby #〇〇 to working #〇〇".
1 indicates the operation of converting the control signal to "Connect standby #〇〇 to current #〇〇" and inputting it to the ⅓ selectors 21A to 23A.

(B) is the control signal regulation to be written to the ROM 11, and when connecting the protection line to the working line, (0,
1) to current #1, (1, 0) to current #2, (1, 1
) indicates connection to current #3, and (0, 0) indicates no control.

(Example 1) is an example in which the backup data #1 is connected to the current data #2, and the control signal is sent only to the backup #1 (1).
, 0), and reserve #2 and reserve #3 are specified as uncontrolled (0
, 0) are input. In the ROM 11, this is a signal that controls the 1/3 selectors 21A to 23A (indicated as #1 selector to #3 selector in the figure) corresponding to the working line. 3 selector 21
A and 23A do not perform control. ” and output it,
The 1/3 selector 22A selects and outputs the spare #1 data according to this control signal.

(Example 2) is an example in which the backup data #2 is connected to the current data #3, and the control signal is sent only to the backup #2 (1
, 1) is specified and input. In ROM11, this is “
The 1/3 selector 23A selects and outputs the data of the spare #3, and the 1/3 selector 22A selects and outputs the data of the spare #3.

[0019]

[Effects of the Invention] According to the present invention, a control signal sent from the transmitting side in the form of "Connect standby #〇〇 to working #〇〇" is converted to "working #〇〇" by logic conversion means. By performing reading control in the format of "Connect spare #〇〇 to
A working/protection line matrix switching system that can reduce the amount of hardware can be realized.

[Brief explanation of the drawing]

[Figure 1] Block diagram explaining the principle of the present invention

[Figure 2
] Diagram explaining an embodiment of the present invention

[Fig. 3] Diagram explaining the operation of the ROM according to the embodiment of the present invention

[Figure 4] Diagram explaining line switching of digital multiplex radio

[Figure 5] Diagram explaining the conventional example

[Explanation of symbols]

10 Logic conversion means 11 ROM
12 Control circuit 21 to 2n selection means
21A-23A 1/3 selector 21a-21c, 22a-22c, 23a-23c
Selector 21d to 23d OR circuit 01, 02, 03 Working line 01A
, 02A, 03A Protection line 1, 2 matrix
31-33 switch

Claims (1)

[Claims] 1. A working/protection line matrix switching system on the receiving side of a digital multiplex radio system, comprising: logic conversion means (10) for converting a control signal for controlling a protection line into a control signal for controlling a working line; , a plurality of input protection lines (#1
-#n) selection means (2) for selecting and outputting one of them;
1 to 2n), and converts the control signal for controlling the protection line sent from the transmitting side to the logic converting means (1 to 2n) on the receiving side.
0) is converted into a control signal for controlling the working line, and the selection means (21 to 2n) is controlled by the signal to select one of the plurality of protection line data (1 to n) and select it for the working line. A working/protection line matrix switching method characterized by performing matrix line switching by outputting line data.