KR960008564Y1 - P.c.b. circuit - Google Patents

Abstract

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Description

Mixed use of extension and trunk lines of private exchange

1 is a mixed internal and trunk line circuit of a private exchange according to a preferred embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

11: ring injection circuit 12: hook on / off detection circuit

13: Battery supply and hybrid circuit 14: CODEC and converter

15 ring detection circuit 16 polarity inversion detection circuit

17: Battery supply and hybrid circuit 18: CODEC and converter

19: line signal control circuit

The present invention relates to a mixed extension and trunk line circuit of a private exchange, and more particularly, to a combined extension and trunk line circuit of a private exchange used in a small capacity private exchange.

In the conventional private exchange, the circuits related to the station and the trunk line each consisted of separate boards. In the case of an extension, a ring injection circuit for supplying a ring voltage to the subscriber and a hook on / off for detecting the hook on / off state of the subscriber Detection circuits, battery supply and hybrid circuits that supply current to subscribers and perform impedance matching during voice calls, code / decoder and converters that code and decode and convert digital / analog signals And a control circuit for controlling the circuits, a ring detection circuit for detecting a ring input from the trunk line, a polarity inversion detection circuit for outputting an inverted result when the polarity input from the trunk line is inverted; Battery supply and hybrid circuit that supplies current to trunk line and performs impedance matching during voice call, codes and decodes, and digital / analog Code / decoder for converting between the signal: and (CODEC COde and DECode) and the converter, and a control circuit for controlling the respective circuits.

The conventional station and trunk lines circuits separated as described above are operated by respective control circuits, but since they are separate boards, small-capacity private switchboards mount unnecessary lines in response to customer demands, thereby increasing costs. The disadvantage of this is that the number of slots to be mounted and the number of slots to be mounted increase, which impedes implementation of a multifunctional private exchange.

Accordingly, an object of the present invention is to provide an internal and trunk line mixed circuit of a private exchange used for a small capacity private exchange in order to compensate for the above disadvantage.

In order to achieve the above object, a mixed extension and trunk line circuit of a private exchange provided by the present invention is connected to a ring injection circuit for supplying a ring voltage to a subscriber, and connected to the ring injection circuit to monitor a hook on / off state of a subscriber. A hook on / off sensing circuit, a battery supply and hybrid circuit connected to the hook on / off sensing circuit to supply a current to a subscriber and performing impedance matching during a voice call, and a battery supply and hybrid circuit connected to the battery And a code / decoder and converter for decoding and converting between digital and analog signals, a ring detection circuit for detecting a ring input from a trunk line, and a ring input circuit connected to the ring detection circuit and inverted when the polarity input from the trunk line is reversed. Connected to the output polarity inversion detection circuit and the polarity inversion detection circuit to supply current to the trunk line, Battery supply and hybrid circuit for impedance matching, Code / decoder and converter connected to the battery supply and hybrid circuit for sign and decoding and converting between digital and analog signals, and multiplexing signals of each circuit It consists of a line signal control circuit that generates a signal that controls the internal circuitry by outputting or demultiplexing an external signal.

With reference to the drawings will be described a mixed circuit of the private exchange and trunk line of the present invention.

1 is a mixed internal and trunk line circuit of a private exchange according to a preferred embodiment of the present invention.

Referring to FIG. 1, a mixed extension and trunk line circuit of a private exchange of the present invention is connected to a ring injection circuit 11 for supplying a ring voltage to a subscriber and the ring injection circuit 11 to hook on / off a subscriber. A battery supply and hybrid circuit 13 connected to the hook on / off detection circuit 12 for monitoring a state and the hook on / off detection circuit 12 to supply a current to a subscriber and perform impedance matching during a voice call. A code / decoder and converter (14) connected to the battery supply and hybrid circuit (13) and performing code and decoding, and conversion between digital and analog signals, and a ring detection circuit (15) for detecting a ring input from a trunk line. ), A polarity inversion detection circuit 16 connected to the ring detection circuit 15 to output an inverted result when the polarity input from the trunk line is inverted, and a current connected to the trunk line by being connected to the polarity inversion detection circuit 16. Supply and well A battery supply and hybrid circuit 17 for impedance matching during communication, and a code / decoder and converter 18 connected to the battery supply and hybrid circuit 17 for signing and decoding and converting between digital and analog signals; And a line signal control circuit 19 which multiplexes the signals of the respective circuits and outputs them to the outside, or demultiplexes the external signals to generate signals for controlling the internal circuits.

Since the mixed extension and trunk lines of the private exchange of the present invention configured as described above are capable of simultaneous extension and trunk line functions, the general subscriber's phone is connected to the extension line, and the CO line has a central office (CO) function. Is connected to the CO line.

First, during an extension call, the ring injection circuit 11 supplies a voltage to the subscriber, and the hook on / off detection circuit 12 monitors the subscriber's off-hook state and displays the state of the line signal control circuit 19. Report). The battery supply and hybrid circuit 13 supplies a current to the subscriber and also performs impedance matching during a voice call, and the CODEC and the converter 14 filter, code and decode, and D / A the input signal. (Digital / Analog) or A / D (Anlog / Digital) conversion.

The ring detection circuit 15 which detects a ring input from a trunk line during a trunk line communication reports a detection signal to the line signal control circuit 19, and the polarity inversion detection circuit 16 is input from a trunk line. If the polarity of 48V and GND (GrouND) is reversed, it is switched from 'low' to 'high' and reports to the line control circuit 19. In addition, the battery supply and hybrid circuit 17 sets a voltage of -48 V input from a trunk line into a line connected to the battery supply and hybrid circuit 17 so that current flows in the line, and the current flows in the battery. It is to be used for the voice call of the supply and hybrid circuit 17 and the CODEC and the converter 18.

The line signal control circuit 19 multiplexes the signals output from the respective lines therein to report the desired processing signals for each line to the upper central processing unit (CPU), which is transmitted from the CPU. Each line is controlled by demultiplexing a control signal.

The mixed extension and trunk lines of the private exchange of the present invention as described above can be flexibly used to implement each function by simultaneously implementing the extension function and the trunk line function in the private exchange through one line signal control circuit. In particular, it makes it possible to accommodate multifunction in a limited slot in a small capacity private exchange.

Claims (1)

A ring injection circuit 11 for supplying a ring voltage to the subscriber, a hook on / off detection circuit 12 connected to the ring injection circuit 11 to monitor the hook on / off state of the subscriber, and the hook on / off A battery supply and hybrid circuit 13 connected to the off-sensing circuit 12 to supply a current to the subscriber and to perform impedance matching during a voice call, and a battery supply and hybrid circuit 13 connected to the battery supply and hybrid circuit 13 to receive codes and decoding. Coder / decoder and converter 14 for converting between digital and analog signals, a ring detection circuit 15 for detecting a ring input from a trunk line, and a polarity connected to the ring detection circuit 15 and inputted from a station book. When the signal is inverted, the polarity inversion detecting circuit 16 outputting the inverted result and the battery supply and hybrid circuit 17 connected to the polarity inversion detecting circuit 16 to supply current to the trunk line and perform impedance matching during voice communication Wow A code / decoder and converter 18 connected to a pick-up and hybrid circuit 17 for signing and decoding, and converting between digital and analog signals, and multiplexing the signals of the respective circuits and outputting them to the outside or outputting an external signal. A mixed line and trunk line circuit of a private exchange comprising a line signal control circuit (19) for generating a signal for controlling an internal circuit by demultiplexing.