KR19980044349A - Output Burst Control Device of Key Phone System - Google Patents

Abstract

The present invention relates to an output burst control device of a keyphone system configured to sense a current flowing in a matching circuit of a keyphone system through a photocoupler and to control an output burst based on the detected current. A claim for controlling a burst output based on a transformer for a transformer, a regulator for supplying operating power to a key-phone telephone through the transformer, current detecting means installed on a power output line of the regulator, and a detection result by the current detecting means. Characterized in that the configuration, including the current detection means characterized in that it comprises a photocoupler.

According to the present invention having the above-described configuration, the signal according to the connection state of the key-phone telephone is automatically notified to the main device, so that the main device can quickly detect the state of the plurality of connection ports.

Description

Output Burst Control Device of Key Phone System

The present invention relates to an output burst control apparatus of a keyphone system. In particular, an output burst control of a keyphone system is configured to sense a current flowing in a matching circuit of a keyphone system using a photocoupler and to control an output burst based on the detected current. Relates to a device.

In general, the key phone system is to provide various services necessary for office automation, and consists of the main device, key phone terminal, and other peripheral devices. It is a variable digital system.

1 is a block diagram showing the main components of a conventional key-phone dedicated terminal, wherein reference numeral 10 is a key phone telephone connected to a main device (not shown), and 11 is a voltage input to the key phone telephone 10 from the main device. UDLT transformer to convert. The UDLT transformer 11 converts the signal from the main device into a signal level suitable for the key phone telephone 10 as well as the impedance matching with the main device.

In addition, reference numeral 12 denotes a UDLT (Univertial Digital Loop Transceiver) slave (Slave), a transmission / reception dedicated chip that transmits and receives data in a 160Kbps full-duplex method through a single pair line, which is a UDLT master unit (DSM) of the main unit. In case of extension, it supports '2B + 2D' format, which is the basic structure of ISDN (Intergrated Service Digital Network), among which, key search information and line status of key phone telephone 10 is provided. A 20-bit burst of messages every 125 ms communicates through the UDLT slave 12 in a ping pong manner.

In addition, reference numeral 13 denotes a regulator for supplying power required by the key phone telephone 10, which receives -24V DC from the master (DSM) through a single pair line and converts it into DC ± 5V.

In addition, reference numeral 14 denotes a microprocessor as a control unit which collectively controls all button information generated in the key phone telephone 10, 15 denotes a program memory that stores instructions for a program of the key phone telephone 10, and 16 denotes data. 17 is a custom IC designed to easily implement various peripheral events generated in the key phone telephone 10. It is a decoder logic, latch, buffer, and key search. (Key Scanning), synchronization of serial data, line status display by LED.

In addition, reference numeral 18 denotes an enable signal for controlling the latch circuit inside the custom IC 17 at addresses A000h-C000h, for example, to control the line state display operation by 32 LEDs. 19 is a status display unit, and 19 reads the state of the column column by direct addressing method at address E000h-EE00h to search the input state of 32 external buttons provided outside of DSS (not shown). As a key scanning unit, the key arrangement is composed of an 8 row (ROW) x 7 column (COLUMN) matrix.

That is, when the user inputs the key phone telephone 10 having the above-described configuration, the microprocessor 14 transmits a data signal corresponding to the selection button through the UDLT slave 12, and the main device side The display data corresponding to the input data signal is sent to the key phone telephone 10 side, and the control operation corresponding to the selected button is executed. In the key phone telephone 10, the microprocessor 14 drives the status display unit 18 based on the display data received from the main device via the UDLT slave 12, thereby calling information corresponding to the button selected by the user. Will be displayed.

However, in the above-described conventional key phone system, the main device sends a predetermined message for each connection line of each key phone telephone and determines whether the key telephone telephone is connected based on the acknowledgment of the message, and then controls accordingly. It is intended to send out signals.

Therefore, in the conventional key phone system, since the main device performs the detection operation sequentially for each connection port of each key phone telephone, it takes a considerable time to detect the connection of the key phone telephone, and the control signal to the connection port where the key phone terminal is not connected. If you send them there was a problem such as a malfunction occurs.

Accordingly, the present invention has been made in view of the above circumstances, the connection state of the key phone and the main device detects the flow of current using a photocoupler, and if there is a detected current is immediately transmitted to the main device to control the output burst. It is an object of the present invention to provide an output burst control device of a key phone system.

1 is a block diagram showing the main configuration of a conventional key-phone dedicated terminal.

Figure 2 is a block diagram showing the internal configuration of the output burst control device of the key phone system according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

10: Key Phone Phone 11: UDLT Transformer

12, 22: UDLT slave 13: regulator

14, 24: microprocessor 15: program memory

16: data memory 17: custom IC

18: line status display section 19: key search section

30: photocoupler D: photodiode

TR: Phototransistor

The output burst control apparatus of the digital key phone system according to the present invention for achieving the above object is a transformer for matching the key phone telephone from the main device, a regulator for supplying the operating power to the key phone telephone through the transformer, the power output of the regulator And a claim value for controlling the burst output based on the detection result of the current detection means.

In addition, the current detecting means is characterized in that it comprises a photocoupler.

According to the present invention having the above-described configuration, when the key phone is coupled to the tip wire and the ring wire, the current output from the regulator by the photocoupler is detected and transmitted to the main device.

Therefore, the claim value can easily detect the connection state of the key-phone telephone.

Hereinafter, an embodiment according to the present invention will be described with reference to the drawings.

Figure 2 is a block diagram showing the internal configuration of the output burst control device of the key phone system according to an embodiment of the present invention, the components that perform the same function as the configuration of Figure 1 in Figure 2 with the same reference numerals. The detailed description is omitted.

In FIG. 2, the photocoupler 30 is coupled between the regulator 13 and the transformer 11. The photocoupler 30 includes a photodiode provided on a power supply output line of the regulator 13 and a light receiving transistor turned on / off in accordance with an optical signal output from the photodiode. The output of this light receiving transistor is applied to the UDLT slave 22.

On the other hand, the UDLT slave 22 performs the same function as described with reference to FIG. 1, and when the high level current detection signal is input to the signal enable terminal SE, for example, the high level valid ( Valid) signal is output.

The microprocessor 24 controls the burst output through the UDLT slave 22 based on whether or not a valid signal is input from the UDLT slave 22.

Next, the operation of the device having the above configuration will be described.

First, when the user connects the phone phone 10 to any port of the main device using a single pair line, -24V DC power is applied to the transformer 11 through the regulator 13, and accordingly As the photodiode of the photocoupler 30 is turned on, a high level detection signal is input to the UDLT slave 12.

Subsequently, when the current detection signal is input from the photocoupler 30, the UDLT slave 12 switches to a normal burst transmission / reception state and outputs a high level valid signal to the microprocessor 24. do.

When the high level valid signal is applied from the UDLT slave 22, the microprocessor 24 recognizes that the key phone is connected and controls the key phone through various control signals accordingly.

On the other hand, when the key-phone telephone is not connected to the tip line and the ring line, the tip line and the ring line are open so that there is no current flowing through the regulator 13.

Therefore, in this case, the low level output of the photocoupler 30 is applied to the UDLT slave 22, and the effective signal applied from the UDLT slave 22 to the microprocessor 24 is also set to the low level so that the microprocessor Reference numeral 22 can easily recognize that the key-phone telephone is not connected.

That is, in the above embodiment, the main device can easily detect whether the key phone telephone is connected, and can quickly determine whether the connection is made.

In addition, this invention is not limited to the said Example, It can variously change and implement within the range which does not deviate from the technical summary of this invention.

As described above, according to the present invention, since the signal corresponding to the connection state of the key phone telephone is automatically notified to the main device, the main device can quickly detect the state of the plurality of connection ports.

Claims (2)

A transformer for matching a key-phone telephone from the main unit, Regulator for supplying the operating power to the phone phone through the transformer, A current detecting means installed at a power output line of the regulator; And an asserted value for controlling a burst output based on a detection result by said current detecting means. The apparatus of claim 1, wherein the current detecting means comprises a photocoupler.