JP2838316B2 - Key telephone equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION (Field of Industrial Application) The present invention relates to a key telephone apparatus for controlling exchange of an internal line and an external line to be accommodated.

(Prior Art) Generally, in the control processing of a key telephone device, an event such as an on-hook or button push is always generated. The lamp is turned on in response to the event, for example, when going off-hook. Processing such as generating a DTMF signal by pressing the number keys interrupts the main processing at regular intervals, starts the program in response to the interrupt, and outputs to the corresponding peripheral device I have.

That is, the periodical interrupt execution management means in the conventional key telephone apparatus manages the activation of each peripheral execution program at regular intervals, and outputs lamp lighting information and bell ringing information to the key telephone. The event output control unit for performing the control is activated by the periodic interrupt management unit at regular intervals because it is a periodic execution program.

(Problems to be Solved by the Invention) However, in the event output control as described above, since the execution cycle of the control is constant, when the maximum number of events to be output in one cycle is determined, Is determined by the interrupt cycle. Therefore, the time interval between occurrences of calls input to the key telephone device becomes short, and when the processor that performs control becomes overloaded, the event output buffer that stores events to be output to the button telephone is stored in the event output buffer. Output events are stored for a longer time. In addition, when an output event further occurs and the event output buffer becomes full, the call processing control unit that performs the exchange control of the event output source stops, and the exchange control waits until the event output buffer becomes empty, or after the event output buffer becomes full. Event input data will be cut off. In order to solve this problem, it is conceivable to reduce the number of single event processes by shortening the interrupt cycle. However, when the number of events is small, the processing time of the main program is reduced due to the interrupt time. There is a problem of lengthening. In addition, waiting for the above exchange control causes a delay in the lighting of the lamp display and the like of the key telephone, and depending on the waiting state, the reception of a new call must be restricted. Completion rate worsens.

FIG. 3 shows how events are registered (stored) in the event output buffer. The column (a) shows the number of events that have occurred, the column (b) shows the timing of occurrence of the event, and the column (c) shows the event. The occurrence timing of the event output control unit
It is represented by S ₁ , S ₂ , S ₃ , S ₄ . Column (d) shows the movement (registration) of the event in the event output buffer, and column (e) shows the number of output events at the timing shown in column (c). Is output.

As can be seen, the number of events shown in column (a) is output as shown in column (d) at the timing of A to G in column (b), while S ₁ , S ₂ , S _{3 in} column (c) , at the timing of S _4, the event of two each are output, for example, at the timing S _2, two timing S ₁ is two events occur at the timing a is registered in the event the output buffer Then, the event output buffer is empty as shown in column (e), but at timings B and C, five and three events are generated, respectively, for a total of eight events, of which two events are Eventually, six events are registered in the event output buffer. At timings D, E and F, two each, G
When one event is generated and output to the event output buffer, the event output buffer is completely full at the timing F. In other words, at the timing G, even if only one event is registered, it waits until the event output buffer becomes empty.

An object of the present invention is to provide a key telephone apparatus which solves the above problems.

(Means for Solving the Problems) The present invention is directed to a key telephone device,
A telephone communication control unit for controlling calls with a plurality of key telephones belonging to the telephone line; a call processing control unit for switching and connecting an extension call constituted by the key telephones to another extension or external line; An event processing buffer for storing an event for causing an extension lamp, a bell, etc. to function, a cycle interrupt execution management means for receiving a cycle interrupt and managing the cycle execution program, and a cycle execution program started by the An event output control unit that reads the event output buffer and outputs the event output buffer to the telephone communication control unit; and detects the number of events stored in the event output buffer and executes an output corresponding to the detection status by executing the periodic interrupt. Comprising a congestion detection means to be input to the management means, the start cycle of the event output unit, which is executed by a cycle interrupt, Serial, and outputs a congestion detection means, by changing in accordance with the queuing status information events, output events to achieve the above, the key telephone system to shorten the time stored in the event the output buffer.

(Examples) Hereinafter, the present invention will be described with reference to examples.

FIG. 1 is a block diagram showing a configuration of a control unit necessary for outputting an event for turning on a display lamp or ringing a bell for a key telephone by the key telephone apparatus of one embodiment of the present invention. FIG. 2 is a time chart of an event output for controlling a key telephone set when the present invention is implemented.

In FIG. 1, reference numeral 1 denotes a key telephone, and 2 denotes a key telephone communication control unit which can perform data communication with the key telephone. Reference numeral 3 denotes a call processing control unit, which performs exchange control for calling another key telephone 1 or transmitting to an outside line based on information received from the key telephone communication control unit 2. 4 is an event output buffer,
This section stores control information for the key telephone 1 generated as a result of performing exchange control by the call processing control section 3. Reference numeral 5 denotes a cycle interrupt execution management means, which is started by a hardware interrupt at regular intervals, and determines which cycle interrupt program to execute from a plurality of cycle start programs. Reference numeral 6 denotes an event output control unit, which is one of the cycle interrupt programs started by the cycle interrupt execution management means 5 and sends an event for controlling the key telephone 1 to the key telephone communication control unit 2. This is a part for controlling output from the output buffer 4. Reference numeral 7 denotes a congestion detecting means for detecting the number of registered events when storing an event in the event output buffer 4 and for determining the event output control unit 6 according to the registration status.
In order to change the start cycle of the program, the cycle interrupt execution management means 5 is requested to output a change.

The present invention is configured as described above. Before describing the operation, the conditions necessary for the operation of the control unit having the configuration shown in FIG. 1 are assumed as follows.

1. The maximum storage number of the event output buffer 4 is ten.

2. The congestion detection means 7 sends the periodic interrupt execution management means 5
When the number of stored events in the event output buffer 4 is less than six, an L level signal is output, and when the number is six or more, an H level signal is output.

3. Periodic interrupt execution management means 5 activates event output control section 6 at a cycle of 32 ms when receiving L level from congestion detecting means 7 and half of 16 ms when receiving H level.
Starts periodically.

4. The event output control unit 6 retrieves up to two events from the event output buffer 4 by one activation and outputs the events to the key telephone communication control unit 2.

Assuming the above, the operation of the present invention will be described with reference to the event output time chart of FIG. 2 and FIG. 3 with reference to the event output time chart of the conventional system. Note that the event occurrence timing and the number of occurrences have the same condition.

First, two events occur at the timing A in FIG. 2 and are stored in the event output buffer 4 in FIG. Cycle interrupt execution management unit 5 at the timing of S ₁ is
Activate the event output control unit 6 and output two events to the key telephone communication control unit 2. Before the next cycle start
When five and three events occur at timings B and C, respectively, the number of events stored in the event output buffer 4 becomes eight as shown in FIG.
Output an H level signal. _Two events are output at the timing of S2, and the number of stored events remains 6, so that the execution level of the periodic interrupt execution management means 5 remains at the H level, so that at the next timing of _S2a Then, two more events are output, whereby the number of stored events becomes four, so that the execution level of the periodic interrupt execution management means 5 becomes L level.

In the case of the conventional method, the activation cycle of the event output control unit 6 is constant, so that the event output control unit 6 is not activated at the timing of _S2a . Similarly, when two events occur at the timings of D, E, and F, respectively, in the method of the present invention, the cycle of execution of the event output control unit 6 is dynamically changed by the cycle interrupt execution management means 5, so that S ₃ , _S3a , an event is output, and the number of events stored at the timing of F is six. However, in the conventional method, the number of events stored at the same timing of F is ten, and the event output buffer 4 becomes full. It is about to become. Here, even if one event occurs at the timing of G, the event is stored in the event output buffer 4 in the method of the present invention. However, in the conventional method, only one event is not stored and the event is issued. Waiting occurs in the call processing control unit 3 that has performed. Comparing the time until the output of the event that occurred at the timing of B ends, the method of the present invention is shorter than the conventional method of FIG. 3, and the delay of the key telephone control is reduced.

(Effects of the Invention) As is apparent from the above description, according to the present invention, when a large number of control events are output to the key telephone in the key telephone apparatus and the load on the exchange control is heavy, the activation cycle interval to the event output control unit is increased. To reduce the time that events occupy the memory of the output buffer and reduce the delay of key phone control,
It is possible to reduce the waiting time for the output buffer of the call processing control unit that performs the switching control, so that call congestion can be suppressed, the call completion rate can be improved, and the event output buffer can store events. Since the execution interval of the periodic interrupt control can be dynamically changed according to the situation, the load applied to the switching control by the periodic interrupt control is reduced as compared with a case where the cycle of the periodic interrupt control is simply advanced. And other remarkable effects.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a control unit for outputting a control event of a main part of an embodiment of the present invention, FIG. 2 is an event output time chart in the present invention, and FIG. 3 is an event output time chart in a conventional example. . 1 ... key telephone, 2 ... key telephone communication control unit,
3 ... call processing control unit, 4 ... event output buffer, 5
... Cycle interruption execution management means, 6... Event output control section, 7.

Claims (1)

(57) [Claims] In a key telephone apparatus, a telephone communication control unit for controlling a telephone call with a plurality of key telephones belonging to the key telephone apparatus, and a call processing for exchanging a call of an extension constituted by the key telephone with another extension or an outside line. A control unit, an event output buffer for storing an event for causing an extension lamp, a bell, or the like generated during the exchange connection to function, and a cycle interrupt execution management unit for receiving a cycle interrupt and managing a cycle execution program The event output buffer is read by the periodic execution program started by the above, the event output control unit for outputting the event output buffer to the telephone communication control unit, and the number of stored events in the event output buffer are detected. And a congestion detecting means for inputting a corresponding output to the periodic interrupt execution managing means. The time during which an output event is stored in the event output buffer is reduced by changing the activation cycle of the event output unit according to the event waiting status information output by the congestion detection means. A key telephone device characterized in that the key telephone device is operated.