KR940008348A

KR940008348A - Asynchronous serial communication circuit of multi-switch unit electronic switching system

Info

Publication number: KR940008348A
Application number: KR1019920016306A
Authority: KR
Inventors: 한성용; 이금영
Original assignee: 정장호; 금성정보통신 주식회사
Priority date: 1992-09-07
Filing date: 1992-09-07
Publication date: 1994-04-29
Anticipated expiration: 2012-09-07
Also published as: KR950012581B1

Abstract

본 발명은 멀티교환유니트 전자교환시스템에 관한 것으로, 단위교환유니트와 주교환유니트간에 가입자 정보를 효율적으로 송수신 할수 있도록 한 멀티교환유니트 전자교환시스템의 비동기 직렬통신회로에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-switch unit electronic switching system, and more particularly, to an asynchronous serial communication circuit of a multi-switch unit electronic switching system capable of efficiently transmitting and receiving subscriber information between a unit switching unit and a main switching unit.

본 발명은 각 단위교환유니트와 주교환유니트간에 메세지를 송수신하는덴 있어 2진메세지를 아스키 메세지로 변환하는 과정없이 직접2진 메세지를 송수신하므로 통신속도를 향상시키며, 각 단위 교환 유니트와 주교환 유니트간에 메세지 충돌없이 원활히 통신 가능하게 된다.The present invention improves the communication speed by directly transmitting and receiving binary messages without converting binary messages to ASCII messages, and transmitting and receiving messages between each unit exchange unit and the main exchange unit. It can communicate smoothly without message collision between them.

Description

Asynchronous serial communication circuit of multi-switch unit electronic switching system

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제1도는 본 발명에 따른 멀티교환유니트 전자 교환시스템의 블럭도.1 is a block diagram of a multi-switching unit electronic switching system according to the present invention.

제2도는 제1도에 나타낸 멀티교환 유니트 전자교환 시스템의 상세 구성도.2 is a detailed block diagram of the multi-switch unit electronic switching system shown in FIG.

제3도는 제2도에 나타낸 입출력 인터페이스 모듈에 구비된 직렬입출력 접속회로, RS-232C접속회로 및 통신속도 조절회로의 상세회로도.FIG. 3 is a detailed circuit diagram of a serial input / output connection circuit, an RS-232C connection circuit, and a communication speed control circuit provided in the input / output interface module shown in FIG.

제4도는 제2도에 나타낸 주교환 유니트에 구비된 RS-232C접속회로 및 직렬입출력 접속회로의 상세 회로도.4 is a detailed circuit diagram of an RS-232C connection circuit and a serial I / O connection circuit provided in the main exchange unit shown in FIG.

Claims

In a multi-switching unit electronic switching system in which a plurality of unit exchange units are connected to a single main exchange unit, and the main exchange unit switches communication paths between the unit exchange units, the unit exchange unit is serially connected from the main exchange unit. Subscriber information transmission and reception means for converting the parallel subscriber information for receiving and converting the parallel subscriber information transmitted in parallel and transmitting the data in parallel to the main switching unit, wherein the main switching unit is serial from the unit switching unit. And a subscriber information transmitting / receiving means for converting serial subscriber information for receiving, converting in parallel and transmitting subscriber information transmitted in parallel to the unit, and transmitting the serial subscriber information to the unit switching unit side. Communication circuits.

The subscriber information transmitting / receiving means of the unit exchange unit comprises: a serial input / output connection circuit for converting subscriber information supplied in parallel from its CPU in parallel, and subscriber information supplied in series from the serial input / output connection circuit. RS-232C connection circuit for transmitting to the main switching unit, receiving subscriber information serially supplied from the main switching unit, and supplying to the serial input / output connection circuit and a communication speed for controlling the transmission / reception rate of subscriber information of the serial input / output connection circuit. An asynchronous serial communication circuit of a multi-switching unit electronic switching system, comprising a control circuit.

The serial input / output unit according to claim 1, wherein the subscriber information transmitting and receiving means of the main exchange unit converts subscriber information supplied in parallel from its own CPU into serial and converts subscriber information supplied in series to its own CPU in parallel. RS-232C connection circuit which transmits the connection circuit and subscriber information supplied in series from the serial input / output connection circuit to the unit switching unit side, receives the subscriber information supplied in series from the unit switching unit, and supplies it to the serial input / output connection circuit side. An asynchronous serial communication circuit of a multi-switching unit electronic switching system comprising: a.

The method according to any one of claims 1 to 4, wherein when the subscriber information transmitting / receiving means of the unit switching unit transmits / receives the subscriber information to the main switching unit side, if the subscriber information to be transmitted exists, it can be received by the main switching unit side. In a first step of transmitting an inquiry message for inquiring a message, if there is a response to the inquiry message from the main exchange unit, the subscriber information is transmitted after transmitting a transmission start message indicating the start of subscriber information transmission to the main exchange unit. In the second step of terminating subscriber information communication, transmitting a transmission end message to the main switching unit side, and repeating the first and second steps when there is a response to the transmission end message from the main switching unit. Multi-exchange unit electronic exchange, characterized by three steps of operation System asynchronous serial communications circuit.

3. The inquiry message according to any one of claims 1 and 2, wherein the subscriber information transmitting and receiving means of the unit switching unit receives the subscriber information from the main switching unit, inquiring whether the subscriber information may be transmitted. Receiving a message from the main exchange unit and determining whether the current state is the idle state, and if the current state is the idle state, sends a response message to the inquiry message to the main exchange unit, and the current state is the idle state. If not, a second step of transmitting a retransmission request message requesting to retransmit the inquiry message to the main switching unit side, and in the second step, a transmission start message for initiating subscriber information communication after transmitting a response message to the main switching unit side; When it is received from the main exchange unit, it switches to the reception standby state. Receiving a subscriber information from the main switching unit and transmitting a retransmission request message to the main switching unit requesting to retransmit the transmission starting message if the transmission starting message is not received from the main switching unit; A fourth step of determining whether an error exists in the received subscriber information by checking the received BCC when the reception of the subscriber information from the main exchange unit is completed; and if the error exists in the received subscriber information, the subscriber information. Transmitting a resend request message requesting retransmission to the main switching unit, and sending a reception end message to the main switching unit to inform that the reception is terminated if there is no error in the received subscriber information. Multi-exchange unit, characterized in that Chair exchange system asynchronous serial communication circuit.

The subscriber information according to any one of claims 1 to 3, wherein when the main exchange unit transmits subscriber information to the unit exchange unit side, the subscriber information to be transmitted when the unit exchange unit is not in a reception state after waiting a predetermined time. After the first step of calculating the BCC, and after performing the first step to determine whether the unit switching unit is in the receiving state, if the unit switching unit is not receiving the subscriber information to the unit switching unit side and In a second step of receiving a response from the unit exchange unit, in the case of a response time transmission time message from the unit exchange unit, switching to a reception state to receive subscriber information from the unit exchange unit, and receiving the information from the unit exchange unit. If the response indicates that the response may be transmitted, the subscriber information is sent to the unit switching unit. And a third step of receiving a reception completion response signal from the unit switching unit side after transmission.

The memory according to any one of claims 1 to 3, wherein when the main exchange unit receives subscriber information from the unit exchange unit, information indicating that subscriber information is being received from the unit exchange unit side is recorded in a memory. A first step of transmitting a response message indicating completion of subscriber information reception to the unit exchange unit; if subscriber information and BCC are received from the unit exchange unit within a predetermined time, the received BCC is checked to check whether the received subscriber information is normal If it is determined that the received subscriber information in the queue is normal, and if the queue is normal, the second step of transmitting a response message indicating that the received message is normal to the unit exchange uni-side, the subscriber received by checking the BCC in the second step As a result of determining whether the information is normal, if the information is not normal and the received subscriber information If it is not normal, information indicating that the subscriber information recorded in the memory is being received after performing the third, second and third steps of transmitting a response message indicating that the received subscriber information is not normal to the unit exchange unit. Asynchronous serial communication circuit of a multi-switching unit electronic switching system, characterized in that for operating in a fourth step of erasing and terminating the operation.

4. The subscriber information according to any one of claims 1 to 3, wherein the main switching unit processes subscriber information received from the unit switching unit, the subscriber information present in the queue when the received subscriber information exists in the queue. In the first step of determining whether the subscriber information to be transmitted to the other exchange unit side, the subscriber information to be stored in the queue corresponding to the transmission unit exchange unit to be transmitted to the other unit exchange unit side, the subscriber information to be transmitted to the other exchange unit side If not the information, the asynchronous communication circuit of the multi-switching unit electronic switching system, characterized in that it operates in a second step of processing the subscriber information in itself.

※ Note: The disclosure is based on the initial application.