Special exchanger and control method of special exchanger

Abstract

A private branch exchange changes the load distribution according to the use condition by a main control unit and a sub-control unit. A line card comprises a first module group normally carrying out various operations in response to an instruction of the sub-control unit, a second module group carrying out various operations in response to the sub-control unit or the main control unit, a bus arbitration circuit, and an internal module bus selecting unit having a bypass selector for bypassing the bus arbitration circuit. The main control unit predicts the load on a system at the start of the system from the information stored in the incorporated line card, and determines, considering the prediction result, whether the control is made by the sub-control unit or the main control unit, for each module of each line card.

Description

technical field [0001] The present invention relates to a dedicated exchange and a control method for the dedicated exchange, in particular to a dedicated exchange in which a main control component is mounted on a main control card and a sub-control component is mounted on a line card, and a control method thereof. Background technique [0002] In recent years, private branch exchanges (PBXs) with built-in computer telephony integration (Computer Telephone Integration: CTI) functions, ISDN-compatible PBXs, and PBXs equipped with wireless functions have been commercialized. [0003] Based on such an environment, in order to adapt to the ever-increasing load, a PBX equipped with multiple central processing units (CPUs) has been introduced. In this kind of PBX, the main CPU (main control unit) mainly performs the processing and overall control of the main application program. The sub-CPU (sub-control unit) is installed in various line cards, and mainly performs necessary real-...

AI Technical Summary

Problems solved by technology

In this way, when the sub-control unit 105 is in an inoperable state, the action of the line card carried by the sub-control unit 105 cannot be guaranteed.

At this time, the action in the inner line of the line card fails

[0019] In addition, for example, the first module group A 107 and the independent storage unit 106, and the second module group B 108a, 108b can be directly accessed by both the main control unit 101 and the sub-control unit 105, and the operation of the line card can also be guaranteed, but there must be multiple bus arbitration circuit

In addition, when the control unit 101 or the sub-control unit 105 accesses the lower modules, all bus arbitrations are performed, which reduces the access speed.

In this way, the performance of the PBX decreases accordingly

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