JPH0821279B2 - 3-step switch device - Google Patents

Description

The present invention relates to a three-stage switch device, and more particularly to a redundancy system.

[Conventional technology]

A conventional three-stage switch circuit is shown in FIG. In FIG. 4, 1-1, ..., 1-l, ..., 1-N / n are N / n primary switch circuits constituting the primary switch 1, 2-1, 2-2, ..., 2 −
(2n-1) constitutes the secondary switch 2, and (2n-1) secondary switch circuits, 3-1, ..., 3-l, ..., 3-N / n constitute the tertiary switch 3. N / n tertiary switch circuits, T1, ..., T
n, ..., T (nl- (n-1)), ..., Tnl, ..., T (N- (n-
1)), ..., TN are input terminals, E1, ..., En, ..., E (nl− (n−
1)), ..., Enl, ..., E (N- (n-1)), ..., EN are output terminals.

Therefore, each primary switch circuit of the primary switch 1 has n inputs and 2n-1 outputs, and each secondary switch circuit of the secondary switch 2 has N / n inputs and N / n outputs. Have number 3
Each tertiary switch circuit of the next switch has 2n-1 inputs and n
Output number of.

As can be seen from the configuration of FIG. 4, in the conventional three-stage switch device, no particular consideration was given to redundancy.

[Problems to be solved by the invention]

Since the conventional three-stage switch device described above does not have a redundant configuration, any one of the primary switch circuit, the secondary switch circuit, and the tertiary switch circuit that constitutes the three-stage switch is used.
It had the drawback of losing its function if one failed.

[Means for solving problems]

In order to solve such a problem, the three-stage switch device according to the present invention has one spare tertiary switch circuit as a spare line between the input terminal and the output terminal, and the tertiary switch circuit and the output terminal. A spare changeover switch for switching between outputting an electric signal to the output terminal from a normal tertiary switch circuit or a spare tertiary switch circuit is provided therebetween.

Further, as a spare line, one spare primary switch circuit and an electrical signal from the input terminal between the primary switch circuit and the input terminal are input to the normal primary switch circuit or to the spare primary switch circuit. It is provided with a preliminary changeover switch for changing over.

Moreover, one secondary switch circuit is provided as a backup line.

[Action]

In the present invention, even if one of the switch circuits of the primary switch, the secondary switch, and the tertiary switch fails,
The function of connecting any input terminal to any output terminal is not impaired.

〔Example〕

FIG. 1 is a system diagram showing an embodiment of a three-stage switch device according to the present invention. In FIG. 1, the same or corresponding parts as those in FIG. 4 are designated by the same reference numerals, and in FIG. 1, 3- (N / n + 1) is a standby switch circuit for the tertiary switch 3, 4-1, ..., 4 -N / n outputs the signal to be output to the output terminals E1, ..., EN from the tertiary switch circuits 3-1, ..., 3-N / n or the standby switch circuit 3- (N / n + 1) It is a preliminary changeover switch circuit for selecting
The preliminary changeover switch circuit constitutes the preliminary switch 4.

Next, the operation of this device will be described. First, the signal from the input terminal T1 is input to the first input terminal of the primary switch circuit 1-1. In the primary switch circuit 1-1, n ×
The (2n-1) switch is set, and the signal is output to the first output terminal of the primary switch circuit 1-1. The most output terminal of the primary switch circuit 1-1 is connected to the most input terminal of the secondary switch circuit 2-1, and the signal is the most input terminal and most output terminal in the secondary switch circuit 2-1. When it is set to connect with, the signal is input to the first input terminal of the tertiary switch circuit 3-1. If the third switch circuit 3-1 is set to connect the most input terminal and the most output terminal, and further set to connect the most output terminal and the output terminal E1 of the preliminary changeover switch circuit 4-1. The input terminal T1 and the output terminal E1 are electrically connected.

In such a state, if the tertiary switch circuit 3-1 is broken, the connection between the input terminal T1 and the output terminal E1 becomes impossible. However, the spare changeover switch circuit 4-1 cannot change the spare switch circuit 3- (N / n + 1). ) Output signal to output terminal E1. Spare switch circuit 3- (N / n
In +1), set to connect the most input terminal and the most output terminal, and further connect the most input terminal and the (N / n + 1) th output terminal in the secondary switch circuit 2-1. This allows the input terminal T1 and the output terminal E1 to be connected again.

FIG. 2 is a system diagram showing a second embodiment of the three-stage switch device according to the present invention. In FIG. 2, the same or corresponding parts as those in FIG. 1 are designated by the same reference numerals. In FIG. 2, 1- (N / n + 1) is a spare switch circuit of the primary switch 1, 4-1, ..., 4 -N / n inputs the signals input from the input terminals T1, ..., TN to the primary switch circuits 1-1, ..., 1-N / n or to the standby switch circuit 1- (N / n + 1) It is a preliminary changeover switch circuit for selecting
The preliminary changeover switch circuit constitutes the preliminary switch 4.

Next, the operation of the second embodiment will be described. First,
The signal from the input terminal T1 is input to the first input terminal of the primary switch circuit 1-1 through the preliminary changeover switch circuit 4-1. In the primary switch circuit 1-1, n * (2n-1) switches are set and the signal is output to the first output terminal of the primary switch circuit 1-1. The most output terminal of the primary switch circuit 1-1 is connected to the most input terminal of the secondary switch circuit 2-1, and the signal is the most input terminal and most output terminal in the secondary switch circuit 2-1. When it is set to connect with, the signal is input to the first input terminal of the tertiary switch circuit 3-1. If the third switch circuit 3-1 is set to connect the most input terminal and the most output terminal, it means that the input terminal T1 and the output terminal E1 are electrically connected.

In such a state, if the primary switch circuit 1-1 is broken, the connection between the input terminal T1 and the output terminal E1 becomes impossible, but the spare changeover switch circuit 4-1 switches the signal from the input terminal T1 to the spare switch. Switch to output to circuit 1- (N / n + 1). Spare switch circuit 1- (N / n +
In 1), set to connect the most input terminal and most output terminal, and further connect the (N / n + 1) th input terminal and most output terminal in the secondary switch circuit 2-1. This allows the input terminal T1 and the output terminal E1 to be connected again.

A third embodiment of the present invention is shown in FIG. In FIG. 3, A1, A2, ..., A (2n-1) are output lines of each switch circuit of the primary switch 1, and B1, ..., Bl, ..., BN / n are each switch circuit of the secondary switch 2. , C1, ..., Cl, ..., CN / n are output lines of each switch circuit of the secondary switch 2, D1, D2, ..., D (2n−
Reference numeral 1) is an input line of each switch circuit of the tertiary switch 3, and in FIG. 3, the same or corresponding portions as those in FIG. 1 are designated by the same reference numerals.

The difference between the third embodiment and the conventional device shown in FIG. 4 is that the number of output lines of each switch circuit of the primary switch 1, the number of switch circuits of the secondary switch, and the number of input lines of each switch circuit of the tertiary switch 3 are different. And are each increased by 1 to 2n.

In the third embodiment, the output lines A1, A2, ..., A2n of each switch circuit of the primary switch 1 and the input lines B1, ..., Bl, ..., BN / n of the 2n switch circuits of the secondary switch 2 are used. And are connected, 3
Input lines D1, D2, ..., D2n and 2 of each switch circuit of the next switch
Output lines C1, ..., Cl, of 2n switch circuits of the next switch 2
…, CN / n are connected.

In the device configured as described above, there are 2n routes connecting an arbitrary input terminal and an arbitrary output terminal. The paths required to connect an arbitrary input terminal and an arbitrary output terminal are shown in the following.

The path used by the remaining (n-1) input terminals of the switch circuit of the primary switch 1 to which any input terminal is connected is n-1. The switch circuit of the tertiary switch 3 to which any output terminal is connected. The path used by the remaining (n-1) output terminals is n-1. The path connecting any input terminal to any output terminal is 1 or more, and the minimum is (n-1) + (n-1) + 1 = 2n-1
Need a street route.

As described above, in the three-stage switch device shown in FIG. 3, there are 2n paths for connecting any input terminal and any output terminal, and the minimum required number of paths is 2n−1.
This means that two backup routes are configured. Therefore, 2
Even if one of the switch circuits of the next switch 2 fails, the function of connecting any input terminal to any output terminal will not be impaired.

〔The invention's effect〕

As described above, in the three-stage switch device according to the present invention, one of the switch circuits of the primary switch, the secondary switch, and the tertiary switch fails because the backup line is provided between the input terminal and the output terminal. Even so, there is an effect that the function of connecting an arbitrary input terminal and an arbitrary output terminal is not impaired.

[Brief description of drawings]

FIG. 1 is a system diagram showing one embodiment of a three-stage switch device according to the present invention, FIGS. 2 and 3 are system diagrams showing second and third embodiments of the present invention, and FIG. FIG. 3 is a system diagram showing the three-stage switch device of FIG. 1 ... Primary switch, 2 ... Secondary switch, 3 ... Tertiary switch, 4 ... Preliminary changeover switch, 1-1, 1-l, 1-N /
n ... Primary switch circuit, 2-1,2-2,2- (2n-1) ...
… Secondary switch circuit, 3-1, 3-l, 3-N / n …… Tertiary switch circuit, 3- (N / n + 1) …… Spare switch circuit, 4
-1,4-l, 4-N / n ... Preliminary changeover switch circuit, T1, Tn, T
(Nl- (n-1)), Tnl, T (N- (n-1)), TN ...
Input terminals, E1, En, E (nl- (n-1)), Enl, E (N-
(N-1)), EN ... Output terminal.

Claims (3)

[Claims] 1. N / n primary switch circuits capable of electrically freely connecting n input terminals and (2n-1) output terminals, and N / n input terminals and N / n. (2n-1) secondary switch circuits that can be electrically connected to n output terminals,
It is composed of (2n-1) N input terminals and N output terminals, which can electrically freely connect N / n third-order switch circuits, and has N input terminals and N output terminals. They can be electrically connected freely, the output terminals of each primary switch circuit are connected to the input terminals of all secondary switches, and the output terminals of each secondary switch circuit are connected to the input terminals of all tertiary switches. In the connected three-stage switch device, one spare tertiary switch circuit is provided between the input terminal and the output terminal, and an electrical signal to the output terminal is provided between the tertiary switch circuit and the output terminal as a normal tertiary signal. Equipped with a spare changeover switch that switches between output from the switch circuit and output from the spare tertiary switch circuit, the number of output terminals of the secondary switch circuit is N / n + 1, and the input terminal of the spare tertiary switch circuit is All two Connected to the output terminal of the switch circuit, all secondary switching circuit of the secondary switch circuit
A three-stage switch device having a function of electrically connecting N / n input terminals and N / n + 1 output terminals of a secondary switch circuit freely. 2. N / n primary switch circuits capable of electrically freely connecting n input terminals and (2n-1) output terminals, and N / n input terminals and N / n. (2n-1) secondary switch circuits that can be electrically connected to n output terminals,
It is composed of (2n-1) N input terminals and N output terminals, which can electrically freely connect N / n third-order switch circuits, and has N input terminals and N output terminals. It can be electrically connected freely, the output terminals of each primary switch circuit are connected to the input terminals of all secondary switches, and the output terminals of each secondary switch circuit are connected to the input terminals of all tertiary switches. In the connected three-stage switch device, one spare primary switch circuit is provided between the input terminal and the output terminal, and an electric signal from the input terminal is normally provided between the primary switch circuit and the input terminal. Equipped with a spare changeover switch that switches between input to the switch circuit and spare primary switch circuit, the number of input terminals of the secondary switch circuit is N / n + 1, and the output terminal of the spare primary switch circuit is All secondary Connected to the input terminal of the switch circuit, all secondary switch circuit secondary switching circuit N /
A three-stage switch device having a function of electrically connecting freely n + 1 input terminals and N / n output terminals of a secondary switch circuit. 3. N / n primary switch circuits capable of electrically freely connecting n input terminals and (2n-1) output terminals, and N / n input terminals and N / n. (2n-1) secondary switch circuits that can be electrically connected to n output terminals,
It is composed of (2n-1) N input terminals and N output terminals, which can electrically freely connect N / n third-order switch circuits, and has N input terminals and N output terminals. It can be electrically connected freely, the output terminals of each primary switch circuit are connected to the input terminals of all secondary switches, and the output terminals of each secondary switch circuit are connected to the input terminals of all tertiary switches. In the connected three-stage switch device, one spare secondary switch circuit is provided between the input terminal and the output terminal, and the output line of each primary switch circuit and the input line of the 2n secondary switch circuits are provided. Is connected, and the input line of each tertiary switch circuit and the output line of 2n secondary switch circuits are connected.