KR970002689Y1 - Terminal exchange equipment using a telegraph channel unit - Google Patents

Abstract

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Description

Station using telegraph channel unit

1 is a block diagram of a device according to the present invention.

* Explanation of symbols for main parts of the drawings

10: transmission and reception double flow circuit unit 20: transmission and reception single flow circuit unit

30: PC coupling part 40: control circuit part

50: modulator 60: demodulator

70: buffer amplifier 80: amplitude limiting amplifier

The present invention relates to a station apparatus using a telegraph channel unit.

The general telegraph end station has been installed since 1974, and its overuse and retirement are severe.The opulence, which is a problem for the TELEX line, and the production ceased from mid 80s, there is no small capacity telegraph station to replace. There is a problem that a huge cost occurs when replacing a new time division multiplexer (TDM) telegraph end station.

The present invention devised to solve the above problems, the whole body to make a PCM / VTG (Pulse Code Modultaion / VOICE TELEGRAPH) telegraph channel unit inserted into the position of the KD-4 single station channel unit to enable direct line configuration without a telegraph end station It is an object to provide a station apparatus using a channel unit.

In order to achieve the above object, the present invention receives an input from a Pulse Code Modulation (PCM) channel board and amplifies and outputs an input signal that fluctuates the signal to a stable level to obtain a stable output against input variations. Amplitude limiting amplification means; Demodulation means for receiving an output from the amplitude limited amplification means and amplifying the amplitude limited amplified signal to a corresponding level; Control means connected to the demodulation means and controlling to output a signal (eg, mark and space signal) voltage necessary for frequency shift using a linear IC; Photocoupler coupling means connected to the control means for converting a direct current DC signal on the input side into a voltage of the control means (eg, a LINERAR IC operating voltage) and outputting the converted signal; It converts into a double-flow telegraph path as required by the exchange side, and uses a current transmitted from the exchange side to turn on and off the PTO COUPLER element in the photocoupler coupling means to change the voltage (e.g., mark ( MARK and SPACE) and transmit / receive double flow converting means for converting into a double flow signal current upon receiving a mark signal when receiving; Transmission and reception step conversion means connected to the photo coupler coupling means and the transmission and reception double flow conversion means for converting into a single flow whole body signal requested by a subscriber station (TTY) and supplying a terminal operating voltage; Modulating means (MOD) connected to the control means for oscillating the fundamental frequency (F) and shifting the frequency and then sending it to the amplifier stage; And buffer amplification means connected to the modulation means to amplify the output of the oscillator and to prevent the influence of load variation on the oscillator circuit.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

1 is a configuration diagram of a single station apparatus according to the present invention, in which 10 is a transmission and reception double circuit circuit unit, 20 is a transmission and reception single circuit circuit unit, 30 is a PC coupling unit, 40 is a control circuit unit, 50 is a modulator, 60 is a demodulator, 70 Denotes a buffer amplifier and 80 denotes an amplitude limiting amplifier, respectively.

As shown in the figure, the transmission and reception double flow circuit unit 10 of the present invention is a transistor relay circuit, which is converted into a four-wire double flow whole body signal required by the exchange side by using the switching characteristics of the transistor, and is transmitted from the exchange side. The current of the MA) is turned on and off through the transistor relay circuit to make the mark and space signal voltages.The receiver receives +50 ( V) is converted into a double-flow signal current of -20 (MA) via the LOOP side. Here, it is adjusted to constant current +20 (MA), and the range is 2.5 (KΩ).

Transmitting / receiving single-circuit circuit section 20 converts into a two-wire single-phase full-body signal required by the subscriber station (TTY) using the transistor relay circuit and the transistor switching action and supplies the terminal operating voltage. The terminal TTY flows a current from +50 (V) through the loop side to -50 (V) and supplies a single-phase signal voltage of DC 100 (V). Normally, loop side becomes high resistance and -5 (MA) supervisory current flows, and when calling or connecting to other station, it reverses polarity of current by switching of transistor and +40 (MA) current flows to make terminal (TTY) Operate.

The operating current of the terminal is converted into a mark and space signal voltage by turning on or off the photo coupler through the transistor relay circuit. Here, the constant current of 40 (MA) is adjusted, and the range of the load on the loop side is 2.5 (KΩ).

The photo coupler coupling unit 30 converts the DC direct current signal on the input side into a linear IC operating voltage of the control circuit unit 40 to be described later.

In addition, the mark and the space signal voltage of the control circuit unit 40 are converted into a bias (BAIS) operating voltage of the transistor relay circuit.

The control circuit unit 40 supplies a mark and space signal voltage necessary for frequency shifting to the modulator 50, which will be described later, using a linear IC.

In addition, the signal voltage rectified and differentiated in the demodulator 50 is turned on / off by the photo coupler of the photo coupler coupler 30 to convert the signal voltage into the mark and space full-body signal current.

The modulator MOD is an FS oscillator. The oscillator OSC NET of a keying circuit composed of two diodes and a Hartley oscillator composed of transistors are electronically coupled. It oscillates at 1860Hz, the fundamental frequency (F), and oscillates at 2010Hz when the mark signal voltage is applied. When the space signal voltage is applied, 1710Hz is oscillated and sent to the amplifier stage by frequency shifting.

The buffer amplifier 70 amplifies the output of the oscillator and prevents the influence of load fluctuations on the oscillator circuit.

The amplitude limiting amplifier 80 amplifies the input signal at which the signal varies from the reference level +15 (DB) to -15 (DB) to a stable level to obtain a stable output against input variations.

The demodulator 60 is composed of a DISC NET (receive tuner) and a rectifier circuit of the first stage power amplifier, and the amplitude limited amplified signal at the receiver is amplified to a sufficient level and then becomes a DISC NET. DISC NET is a double-tuned discriminator consisting of a tuning circuit for F- △ F (1710Hz) and a tuning circuit for F + △ F (2010Hz). By adding the signal, the whole body signal modulated signal is detected and supplied to the operating voltage of the linear IC of the control circuit. VR1 connected to the tuning circuit is used to adjust the shift of the discriminator output.

Therefore, the present invention as described above can directly configure the circuit without a telegraph end station, solve the occurrence of the opuls, and inevitably use a large amount of TDM telephony end station when replacing the old telegraph end station, so facility investment and inefficiency accordingly Because it prevents and transmits to PCM, it is possible to provide a good quality line to the user, and there is an advantage of effectively operating the telegraph line by connecting to a high telex telegraph switch that is currently being installed.

Claims (1)

An amplitude limiting amplifying means (80) for receiving an input from a PCM (Pulse Code Modulation) channel board and amplifying and outputting an input signal whose signal is varied up to a reference level to a stable level to obtain a stable output against input variations; Demodulation means (60) for receiving an output from the amplitude limited amplification means (80) and amplifying the amplitude limited amplified signal to a corresponding level; Control means (40) connected to the demodulation means (60) for controlling a signal (e.g., mark and space signal) voltage required for frequency shifting using a linear IC; A photo-coupler coupling means (30) connected to the control means (40) for converting a direct current DC signal on the input side into a voltage of the control means (for example, a linear IC operating voltage) and outputting it; It converts into a double-flow full-body signal required by the exchange side, and by using the current transmitted from the exchange side, the photo coupler (POTO COUPLER) element in the photo coupler coupling means 30 is turned on (ON, OFF) voltage (eg Transmission and reception double flow converting means (10) for creating a mark (MARK) and a space (SPACE) signal and converting the signal to a double flow signal current upon receiving a mark signal; Transmission and reception current flow conversion means (20) connected to the photocoupler coupling means (30) and the transmission and reception double flow conversion means (10) for converting into a short-circuit telegraph signal requested by a subscriber station (TTY) and supplying a terminal operating voltage; Modulation means (MOD) (50) connected to the control means (40) for oscillating a fundamental frequency (F) and shifting the frequency and then sending it to the amplifier stage; And buffer amplifying means (70) connected to the modulating means (50) to amplify the output of the oscillator and to prevent the influence of load fluctuations on the oscillator circuit.