JPH02277395A - Call issuing detecting system by interruption signal - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to call detection from an extension telephone of an electronic exchange, and particularly to call detection by an exchange that performs the process from call detection to trunk connection in a short time.

[Conventional technology]

The current call detection method for electronic exchanges uses a central processing unit that controls the connection between the extension circuit that detects telephone calls and the entire electronic exchange. It was a scanning method that read the status of the extension circuit at intervals and analyzed the read data to detect calls.

[Problem to be solved by the invention]

In an electronic exchange using the above-mentioned conventional technology, a trunk is connected to a telephone device that is always in a receiving state and then switched to a transmitting state when necessary, and the corresponding extension and the telephone device are connected based on call information from the extension circuit. If you build a system that connects a call path and switches the telephone device to the transmitting state, the call axis detection method is a scan method, so the time from the extension call to the time the telephone device is switched to the transmitting state is This is a problem because it takes a long time and the first part of the message may not be transmitted to the other party.

The purpose of the present invention is to quickly recognize extension call information in a central processing unit, connect the call path between the relevant extension and the target trunk, and shorten the time it takes to switch the telephone device to the transmitting state. The purpose is to accurately transmit the contents of the message.

[Means to solve the problem]

The above purpose is to autonomously transmit call information from the extension circuit by inputting an interrupt signal to the central processing unit based on the call information, instead of using a scanning method to recognize the detection of an extension call. The solution is to shorten the time it takes to recognize a call.

In addition, in order to combine multiple extensions and one communication device into one group and accommodate multiple groups in one electronic exchange, the extension circuit has a group number that can be rewritten by a priority control interrupt circuit and a central processing unit. A holding circuit and an interrupt mask holding circuit are provided to release the interrupt signal after detecting a call. The central processing unit is provided with an interrupt priority control circuit and an address switching circuit that switches the interrupt destination address for each group number.

[Effect]

Simultaneously with the off-hook of the telephone, a calling signal is output from the extension circuit, and at the same time an interrupt signal of the group number to which it belongs is output.

The central processing unit processes the interrupt to the address corresponding to the group number of the interrupt signal, and the calling extension accommodation location can be read in encoded format, so the path connection between the extension and trunk and the communication equipment are easy. It is also possible to switch to transmitting in a short time.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram of an interface with a telephone. When a current flows through the extension circuit 2 due to off-hook of the telephone 1, a calling signal is input to the priority control and encoding circuit 3, and a calling signal encoding output 4 encodes the accommodation position of the called extension.
is obtained, and at the same time, call information is input to the upper side of the interrupt signal gate 6. Furthermore, since the interrupt mask holding circuit 5 is cleared in the initial state, the calling information is input to the group number holding circuit 7. Since the group number holding circuit 7 has an initial value written by the central processing unit, the group number expansion circuit 8 outputs an interrupt signal 9 of the corresponding group number. FIG. 2 is a block diagram of the interrupt control section of the central processing unit. When an interrupt signal is input to the priority control and encoding circuit 10, an interrupt destination encoded address 13 according to the group number of the interrupt signal is output, and at the same time, an interrupt signal 14 is input to the central processing unit 11. Ru.

When the interrupt signal 14 is accepted by the central processing unit 11, a signal indicating the interrupt acceptance state is output, so during this time, the address switching circuit 12 switches the address 13 encoded according to the group number to make the address one. If used as a part,
A vector address corresponding to the interrupt group number can be generated.

Therefore, it is possible to create a program that detects the calling extension for each interrupt group number, and by reading the calling signal encoded output 4 of the corresponding group number, the location where the calling extension is accommodated can be immediately determined. The time from when the caller 1 goes off-hook until the central processing unit 11 recognizes the calling extension can be shortened.

As a result, the path connection between the extension and the trunk and the switching of the telephone device from receiving to transmitting can be accomplished in a short time.

〔Effect of the invention〕

According to the present invention, in a call between an extension and a telephone device connected to a trunk that is always in a listening state and is used by switching between sending and receiving, the time required to switch from receiving to sending can be shortened, so that the content of the sending message can be corrected. It has a communicable effect.

[Brief explanation of drawings]

FIG. 1 is a block diagram from an interface section with a telephone to an interrupt signal generation circuit corresponding to a group number according to an embodiment of the present invention. FIG. 2 is a block diagram from the interrupt signal receiving section of the central processing unit to the address switching circuit. 1...Telephone, 2...Extension circuit, 3...Priority control and encoding circuit, 4...Calling signal encoded output, death...
Interrupt mask holding circuit, 6... Interrupt signal gate, 7...
・Group number holding circuit, 8...Group number expansion circuit, 9...
Interrupt signal for each group number, 10...Priority control and encoding circuit, 1...Central processing unit, 3...Interrupt destination coding a5...Address output. 12...Address switching circuit, address, 14...Interrupt signal,

Claims (1)

[Claims] 1. In an electronic exchange that has an extension circuit that detects calls from a telephone and a central processing unit that receives extension call information and controls the connection of the call path to a designated trunk circuit, the call information is transmitted to the extension circuit. A priority control interrupt circuit that generates an interrupt signal by the central processing unit, a group number holding and expansion circuit that can be rewritten by the central processing unit, and an interrupt signal control unit that generates an interrupt signal of the corresponding group number are provided, and the central processing unit By providing an address switching unit that receives multiple interrupt signals and switches the interrupt address for each interrupt priority control unit and group number, the calling group number is identified by the interrupt address, and the calling extension storage location is determined. A call detection method using an interrupt signal, which is characterized by shortening the time it takes to detect a call by narrowing down and scanning.