JPS6329864B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multiplexing and distributing apparatus, and more particularly to a multiplexing and distributing apparatus having a function of detecting an abnormality in a relay line corresponding section or a common control section of the multiplexing and distributing apparatus.

A multiplex concentrator and distribution device is installed facing each other between the terminal side and the center side via a high-speed relay line, and has the function of scanning multiple low-speed lines and consolidating them into a high-speed relay line, and vice versa. It has the function of distributing connections to lines. As a result, data from multiple terminals or the central side is character-multiplexed in accordance with the channel on the trunk line determined to correspond to the terminal line and sent out onto the trunk line, while the data arrives character-multiplexed. Data on the trunk line is distributed to a plurality of corresponding terminal lines and received by the corresponding terminal device or central communication control device.

By the way, in the conventional multiplex distribution device,
There is no information exchange between the trunk line corresponding section and the common control section that make up this, and therefore,
If a failure occurs in the trunk line support section and the trunk line goes down, it is not possible to determine whether the problem is due to an abnormality in the trunk line support section or the common control section, resulting in a delay in finding the fault. Ta.

The purpose of the present invention is to eliminate the above-mentioned drawbacks of conventional multiplexing and distribution devices, and to detect whether a failure occurs in a relay line, whether it is due to an abnormality in the relay line corresponding section or a failure in the common control section. An object of the present invention is to provide a multiplexing and distributing device that can identify the information.

The above-mentioned object of the present invention is to provide a multiplex concentrator and distribution device having one or more trunk lines, between a relay line corresponding section corresponding to the relay line and a common control section that controls the entire multiplex concentrator and distribution device. , a storage means having a pair of memory areas is provided, and one of the trunk line corresponding unit or the common control unit checks the validity of the information written in one of the memory areas by the other, and determines whether the information is valid or not. If so, an operation to reset the information is performed periodically, and the same operation as described above is also performed periodically for information written in the other memory area by the other of the trunk line corresponding section or the common control section. This is achieved by a multiplex concentrating and distributing device that is characterized by mutually monitoring each other's inoperability.

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

FIG. 1 is a diagram showing an example of the configuration of a communication system using a multiplex concentrator and distribution apparatus according to an embodiment of the present invention, and FIG. 2 is a block diagram showing an outline of the multiplex concentrator and distribution apparatus.

In the figure, 1 is a terminal device, 2 and 2' are low-speed modems, 3 is a low-speed line, 4 and 7 are multiplex concentrator and distribution devices,
5, 5' are high-speed modems, 6 is a high-speed line, 8 is a low-speed line, 9 is a communication control device, 20 is a common control unit, 2
Reference numeral 1 indicates a trunk line support section, and numeral 22 indicates a low speed line support section. The common control unit 20 controls the connection between the low-speed line support unit 22 corresponding to the low-speed line 3 and the trunk line support unit 21 corresponding to the trunk line 6.

FIG. 3 shows the trunk line support section 21 and the common control section 20.
This is a flowchart showing the principle of mutual monitoring between

Two memories A and B are provided, where memory A is an information exchange area for monitoring the common control unit 20 by the trunk line support unit 21, and memory B is an information exchange area for monitoring the trunk line support unit 21 by the common control unit 20. The control section 20 and the trunk line correspondence section 21 use the above memory area to periodically monitor the other party using the method described below.

The monitoring method will be explained based on the flowchart shown in FIG.

The common control unit 20 writes "0" into its own monitoring information exchange area A. The trunk line support unit 21 also writes "0" to its own monitoring information area B (flowchart: (1)).

Next, the common control unit 20 reads the monitoring information area B of the trunk line correspondence unit 21, determines whether the read data is “0”, and if it is “0”, the trunk line correspondence unit 21 is normal. It is determined that this is the case, and "1" is written in the information exchange area B of the trunk line corresponding section 21. Similarly, the trunk line support section 21 is connected to the common control section 2.
0 information exchange area A, and determines whether the read data is "0" or not. If it is "0", it is determined that the common control unit 20 is normal, and the common control unit 20 exchanges information. Write "1" in area A (flowchart: (2)).

The above is a series of operations during normal operation, and the common control unit 2
0. The trunk line corresponding section 21 repeats the above operation periodically.

Next, a case where an abnormality is detected will be explained.
For example, if the trunk line support section 21 detects an abnormality in the common control section 20, the common control section 20 will no longer be able to write "0" into its own information exchange area A. Since the relay line support unit 21 always writes “1” after reading and determining the information exchange area A of the common control unit 20, the next time the information exchange area of the common control unit 20 is read, data of “1” will be input. This means that it is determined to be an error during judgment. The number of errors is determined to be an arbitrary number, and when the specified number of errors is reached, a predetermined operation is performed (for example, by duplicating the common control unit 20,
(e.g. switching from the working circuit to the backup circuit).

In the above explanation, the case where the trunk line support unit 21 detects an abnormality in the common control unit 20 is taken as an example.
The same applies when the common control section 20 detects an abnormality in the trunk line corresponding section 21.

The above memory may be provided in either the common control section 20 or the trunk line correspondence section 21, or may be provided in another location.

It goes without saying that various types of memories, registers, etc. can be used as the storage means.

As described above, according to the present invention, in a multiplex concentrator and distribution apparatus having one or more trunk lines, a relay line corresponding section corresponding to the relay line and a common control section that controls the entire multiplex concentrator and distribution apparatus are provided. A storage means having a pair of memory areas is provided between the relay line corresponding section or the common control section, and the other one inspects the validity of the information written in one of the memory areas. However, if it is valid, it periodically resets the information, and also performs the same operation as described above for the information written by the other of the trunk line support unit or the common control unit in the other memory area. Since the operation is performed periodically and each side monitors the other's inoperability, it has the remarkable effect of making it possible to immediately identify the location of the failure in the event of a failure in the relay line. play.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of the configuration of a communication system using a multiplexing and distributing device which is an embodiment of the present invention, and FIG. 2 is a block diagram showing an outline of the multiplexing and distributing device.
FIG. 3 is a flowchart illustrating the mutual monitoring system of the present invention. 1: Terminal device, 2, 2': Low speed modem, 3,
8: Low-speed line, 4, 7: Multiplex distribution device, 5,
5': high speed modem, 9: communication control device, 20: common control section, 21: relay line support section, 22: low speed line support section.

Claims (1)

[Claims] 1. In a multiplex concentrator and distribution device having one or more relay lines, a pair of memory areas is provided between a relay line corresponding unit corresponding to the relay line and a common control unit that controls the entire multiplex concentrator and distribution device. The relay line support unit or the common control unit may check the validity of the information written in one of the memory areas by the other, and if it is valid, reset the information. The same operations as those described above are also performed periodically on the information written by the other of the trunk line correspondence section or the common control section in the other memory area, and A multiplex concentrating and distributing device characterized in that it monitors inoperability.