JPH1168941A - Method for starting system-down talkie - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the reliability of a system by providing another transmission line between a concentrator and a distributer, informing it to the concentrator via the transmission line on the occurrence of a system-down of the distributer and allowing the concentrator to inform subscribers of a system-down talkie so as to surely send a start instruction. SOLUTION: A central processing unit 10 generates an emergency operation signal to select either of systems in operation in duplicate on the occurrence of a software bug or a fault in the hardware. A controller 11 monitors both the emergency operation signal and a system-down signal from the central processing unit 10, and externally discriminates whether or not an exchange operation of a distributer 2 and transmits a transmission instruction of the system-down signal to a public network 4. The concentrator 1 analyzes a system-down start instruction received by a controller 8 and gives the instruction to a system-down talkie sound source 7. The talkie sound source 7 informs busy subscribers of a system-down talkie from a time division switch 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system down activation system in a switching system having a plurality of devices.

[0002]

2. Description of the Related Art FIG. 4 shows an example of a conventional digital switching system having a line concentrator and a distributor. In the case of a conventional inter-device communication method for notifying a subscriber of a notice that the switching function has been stopped (hereinafter referred to as “system down talk”) when the system of the distribution device is down, the system down of the distribution device 42 is performed. In order to detect and activate the system downtalk 46 of the concentrator 41, a specific channel 48 in the transmission path 43 between the concentrator 41 and the distribution device 42 is used, and autonomous control by hardware without software intervention is performed. By providing a communication control device 52,
An instruction was given to the concentrator 41.

[0003] The control device 47 of the concentrator 41 that has received the system down activation instruction analyzes the contents of the channel dropped from the specific channel in the transmission line and notifies the subscriber 44 of the system down talk. In FIG. 4, reference numerals 45 and 49 denote a line concentrator, a time-division switch of a distribution device, 50 a central processing unit of the distribution device, and 51 a control device for monitoring system down or the like.

[0004]

However, in the above-mentioned conventional inter-device communication method, when a failure occurs in the transmission path control device or when the transmission line cannot be communicated due to disconnection or the like,
System down talk cannot be sent to subscribers because the line concentrator cannot be instructed to send system down talk.
There is a problem that.

[0005] The reason is that, in the above-mentioned conventional inter-device communication system, control information between the concentrator and the distribution device, a transmission line for carrying a communication channel of each subscriber, and control information for system down are shared. That is, the transmission path for transmitting the system downtalk is shared.

Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to provide a switching system including a concentrator and a distribution unit, which is not affected by a transmission line disconnection or the like. To provide an instruction method.

[0007]

In order to achieve the above-mentioned object, the system down activation method of the present invention, in brief, is provided with another transmission line between a concentrator and a distributor. According to the present invention, in a digital switching system having a concentrator and a distributor, a communication transmission path different from a transmission path for performing communication between the concentrator and the distributor is prepared, and a system down of the distributor occurs. In this case, the system down is notified to the concentrator via the communication transmission line, and the concentrator is notified of a system downtalk to the subscriber. The present invention preferably uses a public network between the concentrator and the distributor to secure a transmission path for starting up the system.

[0008]

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

FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention. Referring to FIG. 1, an embodiment of the present invention includes a switching system including a concentrator 1, a distribution device 2, a transmission line 3, a public network 4, and a subscriber 5.

The concentrator 1 includes a time division switch (TSW)
6, a system downtalk sound source 7, and a control device (CNT-B) B8 for communicating via the public network 4 and issuing a system downtalk activation instruction.

The distribution device 2 includes a time-division switch 9 and a central control device 10 for operating under the control of a storage program.
And a control unit (CNT-A) A11 for communicating via a public network with means for detecting system down.

The transmission path 3 is a transmission configured by optical communication, and the public network 4 is controlled by a packet communication network using an X25 protocol.

FIG. 2 is a diagram showing an example of the control device 11 of the distribution device 2 according to the embodiment of the present invention. FIG.
, 14 is a device for monitoring / starting the operating state of the central control device 10, and 15 is an interface device (X.
25 is a microprocessor control device.

FIG. 3 is a diagram showing an example of the control device 8 of the concentrator 1 according to the embodiment of the present invention. 3, reference numeral 17 denotes a system down-talking activation device, 18 denotes a public network interface device (X.25 control device), 19
Is a microprocessor controller.

Next, referring to FIGS. 1, 2 and 3,
The operation of the embodiment of the present invention will be described.

In the central processing unit 10, an emergency operation signal (referred to as "EMA") is used to switch the redundantly operated device when a software bug or hardware failure occurs.
The central processing unit 10 itself monitors the EMA and generates a system down signal.

The control device 11 monitors both the emergency operation signal (EMA) from the central processing unit 10 and the system down signal, and externally determines whether the exchange operation of the distribution device 2 is normally performed. Then, a system down signal transmission instruction is transmitted to the public network 4.

In the line concentrator 1, the control unit 8 is controlled by the public network 4.
The system-down activation instruction received in step (1) is analyzed and transmitted to the system-down talk sound source 7.

The system downtalk sound source 7 notifies the subscriber during a call of the system downtalk from the time division switch 6.

The control device 11 of the distribution device 2 is controlled by firmware of a microprocessor (μP) 16 and can operate irrespective of the operation of the central control device 10. The control protocol of the public network is controlled by X.25, and the system down activation signal is sent in a packet.

The control device 8 of the subscriber control module performs the same control as the control device 11.

In another embodiment of the present invention, the switching system has the same configuration as the system shown in FIG. 1, and a transmission line for sending a system downtalk activation instruction is replaced by the Internet or a dedicated line instead of the public network. May be replaced by

In this case, the line interface section 18 of the control device 8 of the concentrator 1 and the control device 1 of the distribution device 2
By changing one line interface unit 15 to a device corresponding to each protocol, it is possible to provide a flexible system down-talking activation method.

[0024]

As described above, according to the present invention,
The following effects are obtained.

A first effect of the present invention is that a system downtalk activation instruction can be transmitted reliably even when a failure such as a disconnection of a transmission line occurs, thereby improving the reliability of the system.

The reason is that the present invention has a separate transmission path between the concentrator and the distribution apparatus. This is because the probability that a failure in which the network becomes unusable occurs at the same time is very small.

A second effect of the present invention is that a flexible system down-talking activation method can be provided.

The reason is that, in the present invention, the system down signal can be transmitted on various lines other than the public network by changing the line interface of the control device of the concentrator and distribution device to a device corresponding to each protocol. This is because

[Brief description of the drawings]

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

FIG. 2 is a diagram illustrating a configuration of a control device according to the embodiment of the present invention.

FIG. 3 is a diagram illustrating a configuration of a control device according to the embodiment of the present invention.

FIG. 4 is a diagram showing a system configuration of a conventional system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Concentrator (subscriber control module) 2 Distribution device (circuit switching module) 3 Transmission line 4 Public network 5 Subscriber 6 Time division switch in concentrator 7 System downtalk sound source 8 Control device B 9 Time division in distribution device Switch 10 Central control device 11 Control device A 14 Device for monitoring / starting operation state of central control device 15 Public network interface device (X25 control device) 16 Microprocessor control device 17 System downtalking activation device 18 Public network interface device (X25 control Device) 19 Microprocessor control device

Claims (4)

[Claims] In a digital switching system having a concentrator and a distributor, a communication transmission line different from a transmission line for performing communication between the concentrator and the distributor is prepared, and a system down of the distributor occurs. In this case, the system down is notified to the concentrator via the another communication transmission line, and a system down talk is notified to the subscriber from the concentrator, so that the system down talk is activated. . 2. The communication line according to claim 2, wherein the another communication line comprises a public network.
2. The system downtalking activation method according to claim 1, wherein: 3. The method according to claim 1, wherein said another communication transmission line comprises a dedicated line or the Internet. 4. The system town talker according to claim 1, wherein in said line concentrator and said distribution device, an interface unit of said another communication transmission line is changeable to a device corresponding to each protocol. Starter method.