JPH0936780A - Unit changeover device and unit changeover method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To use a unit without hindrance on the occurrence of a fault in which a faulty channel unit cannot be disconnected when a signal line is switched to a standby channel unit. SOLUTION: When a channel unit e.g. 1.m is faulty, a 1st switch (a) in a channel switch 3.m corresponding to the channel unit 1.m is turned off. Then a 2nd switch (b) in other channel switch 3.(m-1) receiving a signal of the faulty channel is closed to supply the signal having been supplied to the faulty channel unit 1.m to the standby channel unit 2 to conduct switching. When the faulty unit cannot be disconnected, the switch unit 3.m is removed to disconnect the faulty unit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is mainly used in a multiplexer having a plurality of channel units and, when the channel unit fails, a unit for switching a signal supplied to the failed channel to a spare channel unit. The present invention relates to a switching device and a unit switching method.

[0002]

2. Description of the Related Art Generally, a multiplexer uses a plurality of channel units. If this channel unit fails, you need to replace it with a spare channel unit.
A typical unit is not designed for hot plugging and unplugging, so it is necessary to turn off the power to insert and remove the channel unit. However, if the power is turned off, the system will go down, and it will not be possible to use other channels using the channel unit that has not failed.

To prevent such a situation, normally, as shown in FIG. 5, the signal line of the signal supplied to the channel units 1.1 to 1.n is drawn into the switch unit 3 to cause a malfunction of the channel unit. Only the signal line of is selected by the switch unit 3 and connected to the spare channel unit 2. At this time, the input signal supplied to the failed channel unit is disconnected. With such a configuration, the failed channel can continue to operate without replacing the failed channel unit. Then, at a time when the power may be turned off, such as in the middle of the night, the power may be turned off and the defective channel unit may be extracted and repaired.

[0004]

However, in such a conventional apparatus, when a channel unit fails and a spare channel unit is used by using a switch unit, the input signal line of the failed channel unit is If the disconnection is no longer possible, the failed channel unit and the spare channel unit are connected in parallel, which poses a problem that impedance matching cannot be achieved. The present invention has been made in view of such a situation, and when a signal line is switched to a spare channel unit due to a failure of one of a plurality of channel units, the failure of the failed channel unit cannot be separated. Even if a problem occurs, it can be used without any trouble.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a unit switching device which, when one of a plurality of channel units fails, switches the signal supplied to the failed channel unit to a spare channel unit. It is a thing. Then, in order to solve the above-mentioned problems, a first switch (a) for turning on / off a signal of a failed channel and a second switch for turning on / off a signal of another channel.
A switch unit (3.1 to 1) provided with a switch (b)
3 · n), the signal of each channel is connected via the first switch of the channel switch corresponding to that channel so as to be supplied to the channel unit (1) corresponding to that channel, and It is connected so as to supply the signal via the second switch of the channel switch corresponding to the channel to the spare channel unit (2). The apparatus thus configured turns off the first switch in the channel switch corresponding to the channel unit when the channel unit fails, so that the signal for the failed channel is supplied to other channels. By switching on the second switch in the channel switch, switching is performed by supplying the signal supplied to the failed channel unit to the spare channel unit.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a circuit diagram showing an embodiment of the present invention, and the same parts as those in FIG. In FIG. 1, channel units 1.1 to 1 · n are provided for each channel, and changeover switches 3.1 to 3 · n are individually provided corresponding to the respective channel units. Each changeover switch sets the signal of the channel adjacent to the contact a (first switch) for connecting the signal of its own channel to the corresponding channel unit, in this example, the channel adjacent to the right side to 1 for all channel units. Contacts b to connect to the two spare channel units 2
(Second switch). The output sides of the contacts b are all commonly connected and connected to the spare channel unit.

When each channel unit is normal, the contact a is on and the contact b is off in all switch units, and the signals of each channel are all supplied to the corresponding channel unit. Here, for example, the operation when the channel unit 1 · m of the channel m has a failure is shown in FIG.
Shown in At this time, channel unit 1 of channel m
The switch a of the switch unit 3 · m corresponding to m is turned off, and the switch unit 3 · (m−
Turn on the switch b of 1).

In this way, the signal of channel m is shown in FIG.
Is supplied to the spare channel unit 2 by a path indicated by a thick line in FIG. 2, and the function of the failed channel unit is replaced by the spare channel unit 2. FIG. 2 summarizes the operation of each relay contact corresponding to the failed channel unit. For example, when the channel unit 1 · m of the channel m fails, the switch unit 3 · m of the channel m turns off both the relay contacts a and b as shown in FIG. 2, and the signal of the channel m is the previous switch unit. Three
-Because it is output to the spare channel unit 2 via (m-1), the contacts of the switch unit 3 (m-1) are both turned on, and the other switch units have contact a.
Is on and the contact b is off.

Next, if the switch unit 3 · m has a failure such that the contact “a” does not turn off when the channel unit 1 · m has a failure and is switching to the spare channel unit 2, two channels are left as they are. Units are connected in parallel. Therefore, as shown in FIG. 4, when the switch unit 3 · m is pulled out, the failed switch unit 3 · m does not affect the signal circuit, so that the signal of the channel m becomes the channel switch 3 · (m− The channel unit 1 · m which is supplied to the spare channel unit 2 via 1) and has a failure is disconnected and does not adversely affect the spare channel unit. Since the switch units 3.1 to 3m are composed of only relays, the elements inside thereof are not destroyed even when hot-plugging is performed.

[0010]

As described above, according to the present invention, the channel switch is provided corresponding to each channel unit, and when the channel unit in use fails, the signal of the failed channel is transmitted through the adjacent channel switch. Since the power is supplied to the spare channel unit, even if the channel switch corresponding to the failed channel unit fails and the signal line connection that needs to be disconnected cannot be turned off, remove the failed channel switch. This has the effect of repairing the failed channel without affecting the other channels.

[Brief description of drawings]

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

FIG. 2 is a diagram showing a relationship between a failed channel unit and a relay contact that operates.

FIG. 3 is a circuit diagram showing an operation when a channel unit of channel m fails.

FIG. 4 is a circuit diagram showing an example when a defective switch unit is extracted.

FIG. 5 is a diagram showing a conventional example.

[Explanation of symbols]

1.1-1.n channel unit, 2 spare channel unit, 3.1-3 n switch unit.

Claims (2)

[Claims] 1. A unit switching device for switching a signal supplied to a failed channel unit to a spare channel unit when one of the plurality of channel units fails to turn on the signal of the failed channel. A switch unit provided with a first switch for turning off and a second switch for turning on / off a signal of another channel, and a signal of each channel is a signal through a first switch of a channel switch corresponding to the channel. A unit connected so as to be supplied to a channel unit corresponding to that channel, and connected so as to supply a signal via a second switch of a channel switch corresponding to another channel to a spare channel unit. Switching device. 2. The unit switching method according to claim 1, wherein when one of the plurality of channel units fails, the signal supplied to the failed channel unit is switched to be supplied to the spare channel unit. When a certain channel unit fails, the first switch in the channel switch corresponding to that channel unit is turned off, and the second switch in the channel switch for the other channel to which the signal of that channel is supplied is turned off. A unit switching method characterized in that a signal which has been supplied to a failed channel unit by being turned on is supplied to a spare channel unit.