JPS62269455A - Duplex system for line control equipment - Google Patents

Abstract

PURPOSE:To attain duplication of equipments simply by selecting a line connected to a normal line control equipment in two callee lines registered corresponding to callee party number in advance so as to mount a line switch externally to a small-sized exchange system. CONSTITUTION:Line controllers 41, 42 are simplex system and they are connected to lines 71, 72 respectively. One of the lines 71, 72 is selected by a line switch 8 and connected to a host terminal equipment 12 via a host subscriber line 10. If one line controller 41 is faulty permanently, a system controller 5 switches a subscriber line so as to be connected to the normal line controller 42, a line number is read from the callee subscriber numbers at the connection of a call generated, and if the line controller 41 connected to the line 71 is faulty permanently, the next line number is read and the call is connected to the normal line controller 42. Thus, the line switch is mounted externally to the small-sized exchange system and the duplication of the equipments is attained simply.

Description

[Detailed description of the invention] 1 industry-1- field of application'1 The present invention relates to a duplex system for line control equipment.

(Conventional technology) Conventionally, the redundant configuration of line control equipment was a complete duplex system.
There is a -1-1 backup method.

FIG. 2 is a diagram showing an example of a conventional complete duplex system. In the figure, system control device] 4 is a duplex line control device],! , one of 112,
For example, the line control device 11 is connected to the line circuit 16 via the line circuit common bus 15 and joins. It becomes possible to send and receive data to and from the private line.

In this method, the system control device 14 is a duplicated line control device 111. By managing the 12 operating/non-operating states and reporting these states to the other line controller, the other line controller is in the operating state (within the duplex line controller). 1 for line control device
Data can be transferred via the 1-coset bus 13.

[Problems to be solved by the invention] 14 The conventional method described above is either an essential method for an exchange system where reliability is an absolute requirement or a method for a large-scale exchange system, or a method for a small-scale exchange whose main purpose is low cost. The system has a drawback in that it is difficult to incorporate such duplication 171 into the performance in terms of cost and I aspect.

The purpose of the present invention is to enable two specific important subscriber prestigious lines under the restriction that the system control of the line control device is a unified function.
It is possible to connect to one line control device, and when one line control device fails, f1! ! An object of the present invention is to provide a duplex system for line control equipment in which one line control equipment can send and receive data to and from a subscriber line.

1 Means for Solving Problem 1 The redundant system of the line control device of the present invention consists of: - A redundant line control device 2?1, and the line from each line control device is switched and connected to the subscriber's line. a system nano 9 control device that detects fixed faults in the 111f line control device and reads out multiple line numbers from the called party number when a communication call is connected (ahem, one MIF When a fixed failure occurs in the line control equipment, the air system control equipment switches the subscriber line to connect to the normal line control equipment side, and then connects the subscriber's line from the called subscriber number when connecting a communication call. It has the function of reading the line number, and if the line control device to which that line is connected is suffering from a fixed failure, reading the next line number and connecting the communication call to the normal line control device.

lExample 1 Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a duplex (1) system of a line control device according to the present invention.

In the switching system 1 shown in FIG.
11 and 42 are single-layered, and the lines 7], 72 respectively.
is connected to. One of the concave lines 71 and 72 is selected by the line switching device 8 and connected to the post terminal 12 via the post subscriber line 10.

Here, the line control device! The operation when a fixed failure occurs will be explained.

The system control device 5 periodically transmits health check data via the processor bus 2, and the line control device 41
If there is no response data from the line control device 41, the line control device 41 is restarted, or if restart is not possible, it is determined that there is a fixed failure in the line control device 41. When the system control device 5 detects a fixed failure in the line control device 41, it sends a signal to the line switching device 8 to switch the post subscriber line 10 to the line 72 side. By the operation of the line switching device 8, a connection path from the line control device 42 to the line 72 to the line switching device 8 (shown with broken lines) to the POS I/subscriber line 10 is set.

In this state, when establishing a communication call connection from the unsubscribed subscriber line 9 to the host subscriber line 10, the line control device 3 transmits connection request data including the host called subscriber number of the host subscriber line 10 to the processor bus. 2 to the system control device 5. The system control device 5 accesses the number conversion memory 6 using the POS l-called subscriber number as a key, and first the line control device 1
The line number - of the line 71 connected to 1 is read out. Next, since the system control device 5 determines that the line control device 41 is in a fixed failure state, it accesses the number conversion memory 6 again and this time reads the line number of the four-line 72 that is registered as a pair with the four-line 71. read out.

Next, the system control device 5 transfers the connection request data to the dashed line 7.
2, and the line controller 42 receives connection request data from the terminal subscriber line 9 via the connection path of four wires 72 - line switching device 8 - post subscriber line 10. is transmitted to the post terminal 12 via the post I/subscriber line 10.

In this way, the connection from the subscriber terminal 11 to the POS 1 to the terminal 12 is made via the normal line control device 42.

[-Effects of the Invention] As described above, the present invention provides a method for dealing with callee spoofing in advance when a system control device connects a communication call in a small-scale switching system that is a redundant system. By selecting the called line that is connected to a normal line control device among the two registered called lines, the line switching device can be connected to a small-scale switching system. This has the effect of making duplication simple and economical.

[Brief explanation of the drawing]

The eleventh system 1 is a duplex system of the line control device 6 of the present invention.
・A block diagram showing an embodiment. FIG. 2 is a block diagram showing an example of a conventional full-seven-fold north system. 1...Exchange system, 2,13...Brosezahas,
3, /I1. /12,111,112...Line control device, 5.14...System control device, 6...Fragrance conversion memory, 8...Line switching device, 9.Terminal subscriber line, ]0
...Post subscriber line, 11...Subscriber terminal, 12
... Post terminal,] 5. Line circuit common lotus, 16.
... line circuit, 7], 72... line.

Claims (1)

[Claims] Two single line control devices, a line switching device that switches and connects the lines from each line control device to the subscriber's line, and detects a fixed fault in the line control device and a called party number when connecting a communication call. a system control device that reads a plurality of line numbers from a subscriber line, and when one of the line control devices becomes a fixed failure, the system control device switches the subscriber line to connect to the normal line control device side. When a communication call is connected, the line number is read from the called subscriber's number, and if the line control device to which the line is connected has a fixed failure, the next line number is read and the line control device becomes normal. A duplex system for line control equipment, which is characterized by connecting communication calls to the network.