KR950028377A - Terminal exchange method and circuit using commercial telephone - Google Patents

Abstract

The present invention relates to a technology for performing an exchange function for a general telephone and a wireless telephone, not a general telephone and a wireless telephone keyphone terminal. In a general keyphone system, only a keyphone terminal having the same protocol as the main body can be used. There are limitations, and when using an extension, there is a problem that a separate battery should be used in case of power failure, and the indoor wiring is composed of four wires using two voice lines and two data lines. In order to solve this problem, the present invention comprises a two-wire indoor wiring to solve this problem, and the switching unit 3, the internal and external interface 2, (under the microcontroller 4) ( 1) Use regular telephones by connecting communication lines, and use regular telephones and cordless telephones, door phones, fax machines, computers Emitter modems, etc. can also have readily available as well as all people do not have knowledge of the key phone compatibility, and can be automatically connected to the trunk without the need for a separate battery during power outages.

Description

Terminal exchange method and circuit using commercial telephone

Since this is an open matter, no full text was included.

1 is a block diagram of an exchange circuit of a terminal using a commercial telephone of the present invention;

2 is a signal flow diagram for a method of exchange of a terminal of the present invention.

Claims (3)

Receives the external line input or extension input, and if the line is outside, goes to the trunk line. In case of the extension, special functions such as the station interface function, memory dialing, paging / alarm / call polling, etc. are based on the first dialed number. A method of exchanging a terminal using a commercial telephone, characterized in that the function, program selection function, and trunk line selection function are selected and performed. External interface 1 for connecting a line between an external input / output device and an internal device, an internal interface 2 for connecting a line between each internal terminal and an external device, and the external interface 1 and internal interface 2 Converts the analog signal input from the digital signal to the microcontroller 2, and converts the digital signal input from the microcontroller 4 into an analog signal to the external interface 1 and the internal interface 2; A switching unit 3 which is connected to an external interface 2 which connects one of the internal devices 5A-5G through the internal interface 2 under the control of the microcontroller 4 and the output box; A microcontrol that controls one of the internal devices 5A-5G to be connected to the external interface 1 based on the device selection number input through the switching unit 3. An exchange circuit for a terminal using a commercial telephone, characterized by comprising a roller (4). The switching circuit of a terminal using a commercial telephone according to claim 2, wherein the switching unit (3) is configured so that each external line is switched to each internal station at the time of power failure by using the trunk line / extension switching relay. ※ Note: The disclosure is based on the initial application.