JPS59200595A - Contention prevention system of subscriber attended control type electronic switchboard - Google Patents

Abstract

PURPOSE:To eliminate the need to arrange a dedicated contention preventing device individually and simplify system constitution by providing a connection control processor with a means which sets a contention prevention flag in a contention flag memory. CONSTITUTION:If a terminal equipment connected to a subscriber circuit 401 changes in state, a signal control processor 201 detects the state change, and the connection control processor 101 sets the contention prevention flag in a corresponding area in the contention prevention flag memory 211. When the setting of this flag is completed, the contents of a center terminal flag memory are read and its readout information is added to send out a state change detection signal to the processor 101. When the terminal equipment which is connected to the circuit 101 and has the state change detected is in the center, the processor 101 gives priority to processing for it to perform exchange processing. When this terminal equipment is not in the center, the contention prevention flag is set in a corresponding area in the contention prevention flag memory 21m corresponding to the terminal equipment which is connected to a subscriber circuit 4n1 and considered to be in the center.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a competition prevention method in a distributed control electronic exchange.

Conventionally, conflict prevention in electronic exchanges has been achieved by providing a conflict prevention device that can be accessed in common from each processor and a memory that stores a conflict prevention flag within this conflict prevention device. This is done by setting the contention prevention flags of all terminal equipment related to the call using the test and set means of the processor when a processing request for the call occurs, and prohibiting processing requests from other terminal equipment. There is. However, in order to prevent conflicts with respect to processing requests from terminal equipment in this way, it is necessary to provide a dedicated conflict prevention device that can be commonly accessed by each processor, and also to create a space between each processor and the conflict prevention device. It is necessary to provide a special communication means, which complicates the system configuration. SUMMARY OF THE INVENTION An object of the present invention is to provide a competition prevention method for a distributed control type electronic exchange that can eliminate such problems.

The present invention provides a signal control device having a control means for detecting a control signal arriving from an external device to a device connected to a communication path network, and a control means for sending a control signal from the device connected to the communication path network to the external device. A control processor is provided corresponding to a predetermined group of devices connected to the communication path network, and at least one connection control processor is provided for controlling connection of the communication path network, and the signal control processor and the connection control processor are provided. and a transmission means for transferring information between these processors to control a conversion system. A memory for storing a conflict prevention flag in an area corresponding to the external device and a memory for storing a central terminal flag indicating that the external device is an external device that gives priority to processing of internal state changes of the external device in a connected state. and a means for setting a conflict prevention flag in the conflict prevention flag memory is provided in the connection fee (goods) processor, and processing requests from the plurality of external devices are given priority and processed.

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

Referring to the diagram showing an embodiment of the contention prevention method according to the present invention, the communication path network 60 includes subscriber circuits 401 to 40n,
......, 4n1 to 4nn and trunk circuit 50
1 to 50-e, . A terminal device (not shown) is connected via the terminal.

Subscriber circuits 401 to 40n, 4n1 to 4
nn and trunk circuits 501-50. ＃、・・・・・・
, 5n1 to 5n, and 13 are divided into groups and connected to the signal control processors 201 to 20m, respectively. Also, at least one communication path network 60 is connected to the signal control processors 201-20m. Each of the signal control processors 201 to 20m processes signals input to and output from subscriber circuits and trunk circuits, and selects a communication path network. Furthermore, each of the signal control processors 201-20m has a conflict prevention flag memory, 211-21m, and a central terminal flag memory 221-22m. These memories are built into each processor or connected externally. Each of the contention prevention flag memories 211-21m and the central terminal flag memories 221-22m corresponds to a terminal device. 4n
n,) has flag storage areas corresponding to rank circuits 5nl to 5ne. The control processors 101-10! are connected to the signal control processors 201-20m via the bus 30! is connected to any signal control processor so that it can send and receive signals. Here, the signal control processors 201 to 20m5
- constitutes a functionally distributed arrangement form, and the connection control processor 101
~The IOA in the empty state is the subscriber circuit 401 and the subscriber circuit 4nl in the signal-controlled distributed electronic exchange.
If the terminal devices connected to the respective terminal devices are in a communication state and a new state change occurs in the terminal device currently connected to the joining saving circuit 401, when the signal control processor 201 detects the state change, the conflicting Defense flag memory 211
For example, a conflict prevention flag is set in the corresponding area by the test and set means of the connection opening/opening first processor 101. If this flag setting is successful, the contents of the central terminal flag memory 221 for displaying which of the currently connected terminal devices can receive priority for processing after the central terminal is read out and the read information is added. and sends a state change detection signal to the connection control processor 101 via the bus 30. The connection control processor 101 identifies whether the terminal device connected to the subscriber circuit 401 whose status change has been detected this time is the central terminal 6-, and if it is the central terminal, compares its processing with other processing. The exchange process is executed with priority given to the On the other hand, if this terminal device is not the central terminal, connect to the corresponding area of the conflict prevention flag memo IJ 21 m for the terminal device connected to the main subscriber circuit 4n1 among other terminal devices connected to this terminal device. A competition prevention flag is set by the test and set means of the control processor 101, and the timing is adjusted to the signal-based neighboring processor 20m. If this set is successful, the main priority terminal device (connected to the subscriber circuit 4nl) assumes that the process is not yet executed, and executes the process for the terminal device whose status has changed this time (connected to the subscriber circuit 401). At this time, since the corresponding area of the conflict prevention flag memory 21m for the terminal device (4n1 connection) is set, the state change detection from both terminal devices connected by the communication path network 60 is excluded from now on. In addition, conflict prevention flag memo I for the terminal device (4n1 connection) that should be the center
If the result of the test and set for the corresponding area of J 21 m is unsuccessful, detection of the state change of the terminal device whose state has changed this time is excluded as the priority terminal processing is being executed.

Note that even if the signal control processor 201 checks the contention prevention flag memory 211 corresponding to the state-changing terminal device by test and set and is unsuccessful, the current state change detection is excluded as the corresponding terminal processing is being executed. As explained above, according to the present invention, the signal control processor is provided with a storage memory for conflict prevention flags and a storage memory for central terminal flags, and the connection control processor is provided with a memory for conflict prevention flags that is tested and set via a bus. By providing a means for performing this, it is possible to simplify the system configuration by eliminating the need for a dedicated conflict prevention device that is individually arranged.

[Brief explanation of the drawing]

The figure is a configuration diagram showing an embodiment of the present invention. 101, IOJ...-Connection control processor, 2
01゜20m...Signal control processor, 211
．． 21m・・・・・・Conflict prevention flag memory, 2
21.22m...Central terminal flag memory, 30...-
... bus, 401°40n, 4nl, 4nn...
...Subscriber circuit, 5o1゜50A, 5n 1, 5n-8
=-- Trunk circuit, 6°... Call path network. 9-

Claims (1)

[Claims] a control means for detecting a control signal arriving from an external device to a device connected to the communication path network; and an fc connected to the communication path network.
A signal control processor having a control means for sending a control signal from a device to an external device is provided corresponding to a predetermined group of devices connected to the communication path network, and connection control is performed to control the connection of the communication path network. A distributed control type electronic father exchange system is provided in which at least one processor is provided, the signal overturning processor, the connection control processor, and a transmission means for transferring information between these processors are provided to control the father exchange system. In the step, an external device processes a change in the state of the external device connected to a memory storing a conflict prevention flag in an area corresponding to the external device accommodating the communication path network controlled by each of the signal control processors. a memory for storing a central terminal flag indicating that there is a central terminal flag, and a means for setting a conflict prevention flag in the conflict prevention flag memory is provided in the connection control processor, giving priority to processing requests from the plurality of external devices. A competition prevention method for distributed control electronic switching equipment that is characterized by processing by assigning rankings.