JPH11243449A - Line switching device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To duplex a line input part or a line output part, switch a signal at the time of fault occurrence and to rescue it, without adding a line switching part in a large-scale and without incorporating line switching into the line input part or the line output part itself. SOLUTION: This line switching device is constituted such that an attachment 6 is connected to an external input on the input side of a line input part 4, receives an input signal from an external line, switches and outputs input signal to an input terminal corresponding to reception line input parts 1 and 4. Furthermore, it is so constituted that an attachment 14 is connected to the output parts of line output parts 3 and 5, receives an output signal from a line exchange part 2 from an output terminal corresponding to the line output parts 3 and 5, switches it and transmits it to the external line.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a line switching device in a circuit switching device.

[0002]

2. Description of the Related Art In general, in a line switching device, a line input unit and a line output unit are connected, the connection is switched by the line switching unit, and a signal input from an arbitrary external line is switched to an arbitrary external line and transmitted. Is done. If a fault occurs in the line input section or the line output section, a specific line becomes unusable. To prevent this, it is necessary to double the line input section and the line output section and switch to the time of the fault to recover. is there.

Conventionally, a line switching device with a backup function has been developed. There have been proposed ones having a fixed backup interface, those having a line switching unit interposed between a line input unit or a line output unit and a line switching unit, and others.

For example, Japanese Patent Publication No. 8-4274 discloses that
It describes that a line switching unit is incorporated in the line input unit or the line output unit itself.

[0005]

However, in the above-mentioned conventional line switching device with a backup function, the backup interface is fixedly incorporated and becomes large-scale, and the reliability of this block is more problematic. It even happened.

In a system in which a line switching unit is incorporated in a line input unit or a line output unit itself, even in a system that does not require line switching, the line switching unit is constantly added and becomes redundant. Was gone. In addition, the same switching circuit is mounted on each line input unit, and there is a disadvantage that, although only one of the switching units operates at the time of line switching, those that do not need to operate simultaneously are wasted.

[0007] An object of the present invention is to provide a circuit switching unit without adding a large-scale line switching unit as in the related art, and without incorporating a line switching unit in a line input unit or a line output unit itself.
It is an object of the present invention to provide a line switching device which can double a line input unit and a line output unit to switch a signal at the time of failure or the like to perform rescue.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to output and switch an input signal from an external line when at least one of two line inputs of a line input unit connected to a line switching unit fails. This is achieved by providing an attachment for

[0009] The above object is also provided with an attachment for switching and outputting an input signal from an external line when one of at least two line inputs of a line input unit connected to the line switching unit is removed. Achieved by:

It is another object of the present invention to switch and output an input signal from an external line to at least two line inputs among line input units connected to a line switching unit, and to provide a normally closed contact side when power supply is lost. This is achieved by providing an attachment for switching an input signal from an external line to the line input of the present invention.

According to the above means, when the line input unit connected to the external line cannot be used, the signal input from the external line is switched to another line input unit by the attachment and input to the line switching unit. can do. The signal passed through the circuit switching unit is transmitted to a necessary external line via an arbitrary line output unit.

When the power supply for operation supplied to the attachment is lost, the input signal from the external line is switched to the line input on the normally closed contact side.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the principle of one embodiment of the present invention. The line switching device includes a plurality of line input units 1, a plurality of line output units 3, and a line switching unit 2 between the line input unit 1 and the line output unit 3 for connecting an arbitrary line input to an arbitrary line output. Prepare. By the switching of the circuit switching unit 2, a signal input from an arbitrary external line is switched to an arbitrary external line and transmitted.

As a line switching device, a line input unit 1 for switching an input signal from an external line and a transmission signal to an external line.
Are provided before and after the line output unit 3. This attachment 6,14
Are equipped with switching relays 7 and 15, respectively. The input side attachment 6 is supplied with power from the line input unit 4, has contacts connected to at least the line input units 1 and 4, and supplies an input signal to either one. Switching output. The output side attachment 14 is supplied with power from the line output unit 5, has contacts connected to at least the line output units 3 and 5, and switches an output signal from the line switching unit 2.

For example, when the line input unit 1 connected to the external line cannot be used, the relay 7 of the attachment 6 is switched by the switching instruction signal from the line input unit 4, and the input signal input from the external line is input. Connects the input signal to the line input unit 4 by switching the attachment 6 connected to the outside line, and
Input the signal. Thereafter, the signal is transmitted to a required external line via an arbitrary line output unit via the line switching unit 2.

FIG. 2 is a block diagram showing a detailed configuration of a line switching unit to which an attachment 6 on the line input unit side according to an embodiment of the present invention is added. The figure exemplifies and describes an apparatus provided with at least two systems of a line input unit 1 and a line input unit 4.

The same reference numerals as those in FIG. 1 denote the same parts. Reference numeral 8 denotes a control 0 system for performing switching control of line input, and 9 denotes a control 1 system. The control 0 system 8 has an ACT switching register 10,
A system selection display register 12 is provided in the line input unit 1. The control 1 system 9 has an ACT switching register 11, and a selection display register 13 of the 1 system is provided in the line input unit 4. The instruction from the ACT switching register 10 of the control 0 system 8 and the instruction from the ACT switching register 11 of the control 1 system 9 are connected in a confounding manner, operate the selection display registers 12 and 13 of the line input unit, and operate the line input unit 4. Supplies the switching operation voltage to the relay 7 of the attachment 6.

An input signal from an external line connected to the attachment 6 is connected to the line input unit 1 via a relay contact inside the attachment 6, and thereafter, an exchange process in the apparatus is performed. At this time, the relay contact of the attachment 6 has a normally closed contact (Normally Co.) on the line input section 1 side.
The transmission line is forcibly connected to the line input unit 1 even if there is no switching setting from the control system that performs the switching control. For this reason, there is no need to always turn on the relay 7 and the reliability is high.

When a fault occurs in the line input unit 1, a setting instruction from a control system for performing switching control is sent to the attachment 6, and switching of the relay contact is switched from the line input unit 1 to the line input unit 4 side. Can be Further, when a failure occurs in the control 0 system 8, switching can be performed only by the control 1 system, so that the line can be switched regardless of the failure mode of the control 0 system 8 and the line input unit 1. That is, the control 0 system 8 and the control 1 system 9 that issue the line switching instruction are connected to the line input unit 1 and the line input unit 4 in a confounding manner, respectively, and follow the instruction from the line input unit 4 to the attachment 6. Since the relay operating voltage is supplied and switching from the line input unit 1 to the line input unit 4 is performed by switching the relay contacts, the control of the attachment 6 cannot be disabled by only one of the failures in the control system. There is no problem in reliability.

When the control 1 system 9 is removed and the power is turned off, or when the line input unit 4 is removed and the power is turned off, the relay contact of the attachment 6 is forcibly and forcibly hardened to the line input unit on the normally closed contact side. Switched to 1. In this regard, there is no problem even if the connection for the operation control of the relay 7 of the attachment 6 for the line switching control is connected only to the control 1 system 9.

[0022]

As described above, according to the present invention, an attachment for switching an input signal from an external line and outputting the signal to a line input unit is added. When not added, there is an effect that a configuration without a standby system can be easily formed. In addition, the attachment is not a large-scale one and is highly reliable, and has the effect that it is not fixedly incorporated or constantly added to make it redundant.

[Brief description of the drawings]

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

FIG. 2 is a detailed block diagram of a part of one embodiment of the present invention.

[Explanation of symbols]

1,4 ... line input unit, 2 ... line switching unit, 3,5 ... line output unit, 6,14 ... attachment, 7,15 ... relay,
8, 9 ... control system, 10, 11 ... ACT switching register, 1
2, 13 ... System selection display register.

Claims (3)

[Claims] 1. A line switching device in a line switching device comprising a plurality of line input units, a plurality of line output units, and a line switching unit for connecting an arbitrary line input to an arbitrary line output. A line switching device provided with an attachment for switching and outputting an input signal from an external line when one of at least two line inputs of a line input unit connected to the other fails. 2. A line switching device in a line switching apparatus comprising a plurality of line input units, a plurality of line output units, and a line switching unit for connecting an arbitrary line input to an arbitrary line output. A line switching device provided with an attachment for switching and outputting an input signal from an external line when one of at least two line inputs of a line input unit connected to the other is removed. 3. A line switching device in a line switching device comprising a plurality of line input units, a plurality of line output units, and a line switching unit for connecting an arbitrary line input to an arbitrary line output. Attachment that switches and outputs an input signal from an external line to at least two line inputs of the line input units connected to the switch, and switches the input signal from the external line to a line input on the normally closed contact side when the power supply is lost. A line switching device comprising: