KR950009003Y1 - Subscriber connection circuits for keyphone syste, - Google Patents

Abstract

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Description

Terminal connection circuit for digital key phone system

1 is a schematic block diagram of a digital key-phone terminal connection circuit including the present invention.

2 is a circuit diagram of the present invention.

3 is a PCM data distribution diagram on a multiplexed line according to the present invention.

* Explanation of symbols for main parts of the drawings

600: extension subscriber circuit unit 610: demultiplexer

620: Multiplexer

630-640, 950, 951: digital data receiver

650-660, 740, 750, 940, 941: digital data transmitter

671-677, 730, 730, 910, 911, 920, 921: Matching transformer

700: Data terminal connection circuit 760,960,961: CPU

770: RS 232 770: RS 232 Connector

900, 901: Voice terminal 970, 971: D / A and A / D converter

980, 981: voice input / output unit 990, 991: keyboard

995, 996: LCD A: terminal connection circuit

The present invention relates to a terminal connection circuit for a digital key phone system through a PCM method.

The key phone system includes a plurality of trunk line subscriber circuits, a plurality of station subscriber circuits, a voice change circuit for digitalizing a voice signal, and a CPU for controlling them collectively.

In such a system, communication is performed through the PCM data transmission method. Until now, the terminal connection means is connected by analog voice signals.

In other words, although voice digital data is formed on the transmission line during the switching period, the voice signal transmission method between the exchange and the trunk line terminal uses analog signals, so that only one subscriber terminal can be installed on a single line, so it is not scalable and the system equipment is complicated. The aspect will stand out.

The present invention proposes a digital communication terminal access device that can build a full-fledged PCM communication system.

Hereinafter, the present invention will be described with reference to the accompanying drawings.

1 is a schematic blue diagram for introducing the concept of the present invention.

Here, the voice exchange circuit unit 100, the CPU 200 which exchanges the digital data and the address with the voice exchange circuit unit 100, the consultation call circuit unit 300 and the tone generating circuit unit 400 respectively connected to the multiplexed lines. And the trunk line subscriber circuit unit 500 constitutes an existing key phone system, the terminal connection circuit unit (A) to which the voice exchange circuit 100 is further connected is the present invention to enable complete data communication of the PCM method, the subscriber The circuit unit 600 includes a data terminal connection circuit unit 700 and voice terminals 900 and 901.

2 shows a detailed circuit configuration of the terminal connection circuit portion (A) of the present invention.

The RSS 232 770 of the data terminal connection circuit unit 700 connects the RS 232 connector 780 with a PC or a printer (not shown) so that the PC or printer can exchange data with the CPU 760 and the CPU ( Data of the 760 is configured to connect and transmit along the transmission path through the digital data transmission, the receivers 740 and 750 and the matching transformers 720 and 730.

The transmission data that has passed through the matching transformer 720 passes through the demultiplex 610 through each of the matching transformers 671 and 672 and the data receivers 630 and 631 of the subscriber subscriber circuit unit 600 and then the voice switching circuit ( 100) to be provided.

In addition, the voice input signal of the voice switching circuit 100 is matched with the data terminal connection circuit unit 700 along the transmission path through the multiplexer 620 and the respective matching transformers 675 and 676 of the digital data transmitters 650 and 651. Connect to be provided to the transformer 730.

Each voice terminal 900 or 901 has a CPU 960 and 961, a keyboard 990 and 991, an LCD 995 and 996, an audio input and output unit 980 and 981, a D / A and an A / D converter, respectively. 970, 971), digital songs. Receivers 940, 941, 950, 951, and matching transformers 910, 911, 920, 921 and DC power transformers 930, 931, and the voice terminal 900 includes a data terminal connection circuit 700. The voice terminal 901 is connected to each other and the transmission line is shared, and each matching transformer (677, 673) of the subscriber circuit unit 600 along the transmission path, and each digital data transmission. The receivers 660 and 640 are separately connected to the multiplexer 620 and the demultiplexer 610.

The operation and effects of the present invention configured as described above will be described.

First, digital communication between the data terminal connection circuit unit 700 and the subscriber subscriber circuit unit 600 will be described.

Transmission data such as a PC or a printer connected to the RS 232 770 through the RS 232 780 is transferred along the PCM transmission path through the digital data transmitter 740 and the matching transformer 720 via the CPU 760. (671) (672).

At this time, the data terminal connection circuit unit 700 receives a DC 24V through a transmission line and receives + 5V and ± 10V generated by the transformer 790 as operating voltages.

Digital data such as a PC or a printer that has passed through the matching transformer 671 672 is supplied to the voice switching circuit unit 100 through the demultiplexer 610 via the digital data receivers 630 and 631.

The demultiplexer 610 receives the time-division data from the 8 subscriber line and multiplexes it.

Contrary to the above, the data of the voice switching circuit unit 100 input through the multiplexing preference is time-divisionally transmitted to eight lines by the multiplexer 620, and the digital data transmitters 650, 651 and matching transformers 675 and 676 are used. Is provided to the input matching transformer of the data terminal connection circuit unit 700 along the transmission path.

Accordingly, the data received by the digital data receiver 750 is output to a printer or a PC connected to the RS 232 770 via the CPU 760.

Next, data communication between the subscriber subscriber circuit unit 600 and the voice terminals 900 and 901 will be described.

The D / A and A / D converters 970 and 971 of the voice terminals 900 and 901 are digital data transmission, receivers 940 and 950 and 941 and 951, and voice input and output units 980 and 981. ) Converts the digital signal into an analog signal or vice versa, and has a time zone setting (time slot) by each CPU 960 (961).

The PCM data is composed of 8 bits, and the MSB changes the signal structure and the LSB changes the signal size by 1/256. The LSB performs the transmission and reception between the main CPU and the terminal CUP.

The terminal CPU receives only the LBSs of the PCM data from the subscriber and analyzes the LBSs of the PCM data to control the voice terminals 900 and 901, and sends the user command to the LSB of the PCM data to be transmitted again to the main CPU.

3 illustrates the PCM data distribution of the subscriber subscriber circuit unit 600, the data terminal connection circuit unit 700, and the voice terminals 900 and 901.

Meanwhile, the voice terminal 900 may share a transmission line with the data terminal connection circuit unit 700 so as to output incoming data as voice or transmit a voice signal. 960 and can be displayed on the LCD 995.

In addition, through the voice exchange circuit unit 100 and the voice terminal 901, the pure voice signal can be transmitted and received by PCM data. In this case, the subscriber subscriber circuit unit 600 includes a demultiplexer 610, a digital data receiver, and a multiplexer 620. The digital data transmitter 660 is operated.

In summary, the present invention operates as described above, even when the voice terminal 900, 901, the data terminal 700, or a single user use all of them in the subscriber subscriber circuit unit 600. Will be realized.

Therefore, the voice terminal and the data terminal can be shared in one data transmission signal, thereby minimizing the data communication facility and facilitating the installation work.

In particular, since the end user is given flexibility in use and expansion, the added value of the data communication system can be significantly improved.

Claims (1)

A digital key phone system, comprising: an RS 232 (770) for connecting a digital data processing system, the RS 232 (770) and a digital data transmission. A data terminal connection circuit unit 700 including a CPU 760 for time-division control of digital data between the receivers 740 and 750, sharing a transmission line with the data terminal connection circuit unit 700, and transmitting digital data. D / A and A / D converters for exchanging voice between the receivers 940 and 950 and the voice input / output unit 980, a CPU 960 for time-division control of transmission and reception digital data, and a keyboard 990. The voice terminal 900, the data terminal connection circuit unit 700 and the shared transmission line of the voice terminal 900 and the dedicated line between the voice terminal 901, a plurality of digital data transmission, receivers (650, 651) ( 630, 631 and the digital subscriber station 600 including a digital data transmission, receiver 660, 640, a demultiplexer 610 and a multiplexer 620 for 8-bit data multiplexing, and the voice terminal 901 The terminal connection circuit for a digital key phone system having the same configuration as that consisting of an internal subscriber circuit unit 600 and a voice terminal 901 connected by a dedicated line.