KR930010296B1 - Analog trunk circuit in electronic exchange - Google Patents

Abstract

The circuit comprises a voice processing section for converting voice signal and PCM (Pulse Code Modulation) data mutually, a dial pulse emitting section for emitting dial signal to an opponent, an inversion detecting section for detecting inversion signal of the opponent, an inversion transmitting section for transmitting inversion signal to the opponent, a dial pulse detecting section for detecting dial pulse from the opponent, and an interface section for transmitting operation control signal to all the system.

Description

Analog trunk and premises broadcasting simultaneous reception circuit in electronic switchboard.

1 is a schematic diagram according to an embodiment of the present invention.

2 is a connection diagram according to the direct call function of the present invention.

3 is a connection diagram according to the dedicated line function of the present invention.

4 is a connection diagram according to the premises broadcasting function of the present invention.

* Explanation of symbols for main parts of the drawings

1: voice processor 2: signal transmitter

3: signal detection unit 4: interface unit

The present invention is a circuit for accommodating analog trunk (Analog trunk) and premises broadcasting (Paging) at the same time in the electronic switchboard, the analog trunk function of the direct trunk function (DOD: Direct Outward Dialing) and dedicated line function in one circuit pack ( The present invention relates to an analog trunk and an on-premises broadcasting simultaneous receiving circuit in an electronic switching system capable of accommodating up to four channels of tie trunk and paging.

In general, in the case of an electronic switch, not only the control processing but also data transmission are executed digitally, while in the case of a private exchange, data transmission is analogized. Therefore, when the above-mentioned electronic switch and private exchange are connected, a separate converter for converting digital data into analog data is required on the private exchange side.

In addition, the private exchange is equipped with a direct call function (DOD), a tie trunk, and an on-premises broadcasting function (Paging), where the subscriber circuit pack (polarity reversal function) of the local exchange is provided on the other side in the direct call function. When the private line function is connected, the analog trunk of the private exchange is connected, and when the broadcast function is used, a general amplifier and a speaker are connected.

However, the above-mentioned direct call function, dedicated line function, and premises broadcasting function have two or more types of circuit packs different from each other in order to perform the function. The omission reduces the usability of the device.

In order to improve this disadvantage, the present invention can be used by mounting anywhere in the analog trunk rack or subscriber pack according to the use of the function required in the system, or can perform the premises broadcasting by the direct dialing function (DOD) of the analog trunk, In case of on-premises broadcasting, analog trunk and on-premises broadcasting can be simultaneously accommodated in an electronic switchboard which cuts -48V and ground to reduce the power loss of the system by DC current between tip, ring and amplifier, and reduce the damage caused by heat. The purpose is to provide a circuit.

In the electronic switchboard according to the present invention for realizing the above object, the analog trunk and on-premises broadcasting simultaneous receiving circuit includes voice processing means for converting voice signals and PCM data and dial pulse sending means for transmitting dial signals to the other party, and the other party. Polarity inversion detecting means for detecting the polarity inversion signal on the side, polarity inversion sending means for sending the polarity inversion signal to the other side, dial pulse detection means for detecting dial pulses from the other side, and operation control signal from the processor Characterized in that it comprises an interfering means for transmitting.

1 is a schematic diagram of a circuit according to an embodiment of the present invention, which includes a voice processing unit 1 for converting a voice signal and PCM data, a signal transmitting unit 2 for transmitting various signals to the other party, and various signals of the other party. It is divided into a signal detection unit (3) for detecting a, and an interface unit (4) for exchanging data with a processor.

In the audio processing unit 1, analog and digital signal conversion, 2-wire and 4-wire conversion, voice signal band filtering, and time slot assignment function are performed. The signal transmission unit 2 is suitable for a counterpart exchange. A dial pulse, an E & M signal and a polarity inversion signal, which are signal forms, are sent. In the signal detection unit 3, the detection unit 3 detects a dial pulse, E & M, and a polarity inversion signal coming from the opposite station.

At this time, the user can check whether the corresponding channel is used by LED. The timing of LED lighting is based on the status of transmitting, detecting and passing dial pulse and E & M signal.

The interface unit 4 writes a write buffer (WR Buffer) for writing data at the time of signal transmission, a read buffer (READ BUFFER) for reading data at the time of signal detection, a write buffer used for CLK, FS, address, etc. and two addresses. A decoder that separates into channels is used.

In this case, only the voice processing unit and the signal transmitting unit are used for the direct transmission function of the analog trunk, the voice processing unit, the signal transmitting unit, and the signal detecting unit are all used for the dedicated line function, and only the voice processing unit is used for the internal broadcasting function.

However, all three functions must use the interface unit in common.

2 is a direct call function connection diagram of the present invention, and relates to connection and description of a counterpart station for performing a direct call function.

As shown in FIG. 2, S4 and S5 are composed of hardware switches, and each function is used according to the needs of -48V and its own.S1, S2 and S3 are relay switches, S2 is D1 bit, S1 and S3. Is configured to operate on software data of D3 bits.

In the present invention, the switch normally has S2 open, S4 and S5 shorted, and -48V and branch are supplied to the tip and ring, and S1 and S3 are connected to the subscriber circuit of the trunk line switch and the present invention because C is shorted to the A side. There is no current caused by the potential difference.

However, when operating in direct call function under normal condition, S2 is shorted by two bits (D1, D3) of WR buffer, and S1 and S3 are C (short) from A to B. OV), current flows to -48V of the subscriber circuit via S1, S2, S3 of the present invention.

When this is detected by the local exchange subscriber circuit, and the necessary digits are written to the circuit of the present invention through the WR buffer as one bit (D1), the S2 switch opens and shorts the digits to the other station. When the subscriber hooks (Off) by connecting the circuit, the circuit pack connected to the present invention sends a polarity inversion signal as a response signal.

This circuit detects this, and then the RD buffer of the upper four bits (D4-D7) corresponding to the channel is read and then made.

3 is a connection diagram of a tie trunk state. Like a direct call function, a connection line is connected to an analog trunk of a counterpart station without connecting to an analog trunk of a counterpart station as a direct call function. It is a circuit that accommodates.

As a condition of the dedicated line function, the present invention simultaneously accepts the direct dialing function (DOD) and the direct receiving function (DID: Direct Inward Dialing) per channel, and according to the signal type of the analog trunk of the opposite station, the loop dedicated line method and the 2-wire E & M The leased line system is configured to be used.

Loop dedicated line method processes both signal and voice with Tip and Ring line, while 2-wire E & M dedicated line processes only voice signal with Tip and Ring and signal with E & M line. Is different.

In the loop-only line transmission method, the direct transmission function and the operation method are the same as those in FIG. 2, and when the analog trunk of the opposite station performs the direct transmission function as opposed to the direct transmission function, the trunk line is captured by the flow of current. When the RD buffer of the lower 4 bits (D0-D3) is detected by reading the transmitted digit and then translated, it is translated and the subscriber receives the call signal (RING: 20Hz) or turns off (HOOK OFF). The answer signal (Answer Signal) is transmitted to the calling station through the WR buffer D2 in reverse polarity, and then a call is made with the other station.

However, the two-wire E & M leased line system is a process consisting of a tip ring line after sending a branch signal, which is a capture signal of the opposite station, to the M line when the call is transmitted, and the reverse when the call is received. At this time, the response signal AD sends a pulse to the originating station by the M line, not the polarity reversal signal, and the originating station detects this. Since the E & M dedicated line method does not use polarity inversion as the response signal, the RD buffer uses all 8 bits of the loop method, but uses only the lower 4 bits, not the upper 4 bits.

4 is a connection diagram of the premises broadcasting function. When a subscriber inputs a premises broadcasting special code for requesting premises broadcasting, the processor processes it and connects the audio signal to a specific line of the inventive line. It exports to and speaker.

In this case, the present invention and the amplifier are always connected and used, so to reduce the power consumption of the system due to the DC current generated between the amplifier and the circuit pack when the -48V and the branch are not opened, and to reduce the damage of the present invention due to heat. No current flows, and only the audio signal is sent out.

To this end, in the present invention, when the hardware switches S4 and S5 are used in the premises broadcasting function as shown in FIG. 4A, the voice signal is introduced into the amplifier by opening -48V and branch.

And, without using the internal broadcasting function as the present invention, the direct dialing function is always processed by software using the analog trunk of the existing domestic and private exchanges as shown in FIG. 4b to cut off the DC current by cutting off -48V. There is a method of transmitting only a voice signal.

As described above, three functions of the present invention are constituted by one circuit pack, thereby reducing the volume and cost of the exchanger, and allowing the user to easily receive the desired functions only with the intention of the user.

Claims (1)

Voice processing means for converting the voice signal and PCM data to each other, dial pulse sending means for sending the dial signal to the other side, polarity inversion detecting means for detecting the polarity inversion signal at the other side, and polarity for sending the polarity inversion signal to the other side And an inverting transmitting means, a dial pulse detecting means for detecting dial pulses from a counterpart side, and an interface means for sending an operation control signal to the whole apparatus.