JPS6333752B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a distributed and centralized mixing control system for a concentrator stage having a plurality of modules in a digital exchange.

In general, the concentrator stage of a digital switch consists of a small-scale concentrator channel for concentrating lines from several hundred telephones, and a distributed control module that integrates a control section to control this, depending on the scale of the station. It is configured by installing only a few. As the control section, a microprocessor is used, which has recently become rapidly smaller, more economical, and more sophisticated.

In conventional concentrating stages, the concentrating communication paths included in each of the distributed control modules were controlled independently, ie, in a distributed manner, by the respective control sections. Furthermore, since the failure rate of microprocessors used in the control section is relatively high, each module is equipped with multiple microprocessors to ensure the required reliability in the concentrator stage. The system was designed to switch to a spare microprocessor in the event of a failure.

However, there was a problem in that the cost of the concentrator stage became high due to the provision of multiple control units in each module, or in the case of a dual redundant configuration of the control units in an expanded form, which impairs economic efficiency. .

An object of the present invention is to enable, when a failure occurs in a control section included in one module, the control of the concentrating communication path within that module to be performed centrally by a normal control section included in another module. ,
The object of the present invention is to provide a decentralized/centralized mixing control system in which the number of control sections included in one module is increased to one in a concentrating stage of an exchange, thereby increasing economic efficiency and equivalently having the effect of multiplexing control sections.

The gist of the present invention is that, in a concentrator stage of an exchange including a plurality of modules including concentrator talk paths, each of the modules has a control section that controls the concentrator talk path by a storage program method, and a controller for each of the control sections. It is equipped with a control line selection circuit that selects any one of the confounding control lines connected to the output and connects it to the concentrating communication path, and when all the control units are normal, each control unit is connected to the same module. and when a failure occurs in at least one of the control units, one of the normal control units controls the concentrator communication path in the module including the failure control unit. The main feature lies in the distributed and centralized mixing control method of the concentrator stage.

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

The attached drawings apply to one embodiment of the present invention.
FIG. 3 is a block diagram of a concentrating stage of a module; In the figure, the concentrator stage A consists of two distributed control modules 0 and 10, each module accommodating subscriber lines from hundreds of telephones 20 and 20', and a distribution stage that is the next stage after the concentrator stage. Concentration communication paths 1 and 11 forming paths connected to communication path B, and a control section 2 that controls the concentration communication paths by performing concentration connection control and various exchange signal processing using a storage program method using a microprocessor. ,12
, control line selection circuits 3 and 13 that select one control information from the control unit 2 or 12 and apply it to the concentrator communication paths 1 and 11; and a highway 5 that connects the modules 0 and 10 and the distribution stage B. A signal insertion/removal circuit 4, which extracts communication information (common line signal) contained in a specific plurality of bits from the audio information and signal control information transmitted and received via the control line selection circuit 15, and supplies the extracted communication information (common line signal) to the control line selection circuits 3, 13, respectively. It consists of 14.

The operation of the concentrator stage shown in the figure is as follows.
First, in a normal state where no fault has occurred in any of the control sections, the signal insertion/removal circuits 4 and 14 extract the control line selection signal sent from the distribution stage B and send it to the control line selection circuits 3 and 13, respectively. As a result, in module 0, the control line selection circuit 3
In the module 10, the control line selection circuit 13 selects the control information from the control section 12, thereby performing distributed control for each module as in the conventional method.

Next, when the control unit 2 becomes inoperable due to a failure for some reason, the control line selection circuit 3 on the distribution stage B side sends a control line selection signal to the highway 5 and the control line selection circuit 3 so as to select the control information from the control unit 12. The signal is sent to the control line selection circuit 3 via the signal insertion/removal circuit 4, whereby the concentrating communication paths 1 and 11 are centrally controlled by the control section 12. In addition, before shifting to the centralized control mode, the path information and various status information of module 0 that the control unit 2 had before the failure is transferred to the common line signal route 7, the signal insertion/removal circuit 4, the highway 5, and the distribution stage. B and common line signal route 17
The data is transferred to the control unit 12 via.

If the control section 12 encounters a failure, the control section 2 similarly shifts to a mode in which the concentrator communication paths 1 and 11 are centrally controlled.

Please note that the number of modules is not limited to two.
As before, it is possible to install as many as necessary depending on the scale of the station, and in this case, the concentrator communication path included in the faulty control unit will be centrally controlled by one of the normal control units. .

Furthermore, in the above embodiments of the present invention, a case has been described in which the control line selection signal and the path information immediately before the failure of the failure control unit are sent from the distribution stage via the highway, but the present invention is not limited to this. The sources and routes of these signals are irrelevant to the subject matter of the present invention.

According to the present invention, a low-cost distributed centralized control system can be obtained in which the number of control units included in each module constituting the concentrator stage of a digital exchange is one, and which equivalently has the effect of multiplexing the control units.

[Brief explanation of the drawing]

The attached drawings apply to one embodiment of the present invention.
FIG. 3 is a block diagram of a concentrating stage of a module; A: Concentration stage, B: Distribution stage, 0, 10: Distributed control module.

Claims (1)

[Claims] 1. In a concentrator stage of an exchange equipped with a plurality of modules including concentrator communication paths, each of the modules is connected to a control unit that controls the concentrator communication path by a storage program method, and to the output of each of the control units. It is equipped with a control line selection circuit that selects any one of the confounding control lines and connects it to the concentrating communication path, and when all the control units are normal, each control unit connects the concentrating communication path in the same module. and when a failure occurs in at least one of the control units, one of the normal control units controls the concentration line in the module including the failure control unit. Distributed and centralized mixing control method.