KR0178250B1 - Apparatus for sensing/transmitting signals in full electronic switching system - Google Patents

Abstract

The present invention relates to an apparatus for detecting and transmitting a signal for a trunk using an in-band signal at an exchange. In the prior art, analog trunks use analog filter elements to detect signals at 2600 Hz and bandwidths and levels within certain areas of the signals. Therefore, there is a drawback that the bandwidth and level are not accurately sensed due to the limitation of the analog filter element. Accordingly, in the present invention, the signal detection unit 250 receives a signal of 260 Hz, which is received through the analog trunk, to digitally process the signal and detects the bandwidth and the level of the signal. Therefore, since the signal and the bandwidth and the level of the signal can be more accurately sensed, the relay performance of the exchange is improved.

Description

Trunk Signal Detection and Transmission Device at Exchange

1 is a block diagram showing an embodiment of a trunk signal detection and transmission device of an exchange according to the present invention;

* Explanation of symbols for main parts of the drawings

100: tone generating unit 200: trunk

210: buffer 220: codec and filter

230: level variable part 240: hybrid circuit

250: signal detector 252: digital signal processor

254: ROM 256: Latch

258 RAM 300 Processor

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trunk signal detection and transmission device of a switchboard, and more particularly, to an apparatus for detecting and transmitting a signal for a trunk using an in-band signal at a switchboard.

In an all-electronic switching system according to the prior art, an analog trunk communicates with a counterpart station using a signal of 2600 Hz and a bandwidth and level within a predetermined range of the signal. In this case, the analog trunk uses an analog filter element to detect a signal of 2600 Hz and a bandwidth and a level in a predetermined region of the signal.

In this conventional technique, an analog trunk uses an analog filter element to detect a signal at 2600 Hz and a bandwidth and level within a given region of the signal. Therefore, there is a drawback that the bandwidth and level are not accurately sensed due to the limitation of the analog filter element.

The present invention has been made to solve the drawbacks of the prior art, the digital signal processor (DSP (Digital Signal Processor) using a digital signal processor (DSP) to receive the signal and the bandwidth and the bandwidth for the signal It is an object of the present invention to provide a trunk signal detection and transmission device of an exchange to accurately detect a level.

The present invention for achieving the above object, the tone generating unit for generating a tone signal during transmission; A trunk receiving the tone signal of the barrel generator and supplying it to a counterpart station through a transmission line and receiving a signal transmitted from the counterpart station; The trunk is controlled so that the trunk informs the other station of an abnormality in a line or a corresponding line. When the corresponding bit is set, the trunk connects a voice path and becomes in a call state. Characterized in that it comprises a processor.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing an embodiment of a trunk signal detection and transmission apparatus of a switch according to the present invention, and includes a tone generator 100, a trunk 200, and a processor 300.

In the figure, the tone generator 100 receives a 2600 Hz tone signal, that is, a Pulse Code Modulation (PCM) signal Dx of 2600 Hz. In this case, Dx is a transmission pulse code modulation signal. In addition, the tone generator 100 supplies the trunk signal 200 with a tone signal of the same frequency as the received tone signal Dx having a level of -8 dB, that is, a tone signal Dr, CLK, and FS of 2600 Hz. do. At this time, Dr is a received pulse code modulation signal. CLK is the reference clock. FS is a frame synchronization signal. The tone generator 100 supplies 2600 Hz tone signals Dr, CLK, and FS to the trunk 200 because the error of the frequency can be minimized and the desired transmission level can be set accurately. .

Next, the trunk 200 receives a tone signal (Dr, CLK, FS) of 2600Hz from the tone generator 100 and supplies it to the counterpart station through a transmission line (transmission tip, transmission ring). In addition, the trunk 200 receives a 2600 Hz signal transmitted from the other station through a receiving line (receiving tip, receiving ring) and applies a tone signal Dx of 2600 Hz having a level of -8 dB to the tone generator 100. do.

Subsequently, the processor 300 controls the trunk 200 to notify the counterpart station of the trunk 200 through a transmission line when an abnormality occurs in a line or a corresponding line, and when the corresponding bit is set, the trunk ( 200 connects the voice path and puts it on the phone.

Here, the buffer 210 in the trunk 200 is a tone signal (Dr, CLK, FS) of 2600Hz having a level of -8dB of the tone generator 100, the control signal (control address, control data) of the processor 300 And a latch signal according to signal detection of the digital signal processor 252 through the latch 256 to output the respective signals Dr, FS, and MCLK. At this time, the MCLK is a pulse code modulation basic control clock.

Next, the codec and the filter 220 receive a 2600 Hz tone signal Dr, FS, and MCLK having a level of -8 dB from the buffer 210 and convert it into an analog signal of 2600 Hz to convert the level variable unit 230. Will output In addition, the codec and filter 220 converts the signal received from the level variable unit 230 into a tone signal of 2600 Hz and applies it to the tone generator 100.

In addition, the level variable unit 230 drives a corresponding channel blocking relay to notify the counter station when an abnormality occurs in a line or a corresponding line, and thus the level of the 2600 Hz analog signal from the codec and the filter 220. The output is varied by -13dB. In addition, the level variable unit 230 applies a signal of 2600Hz transmitted from the opposite station to the codec and the filter 220.

In addition, the hybrid circuit 240 receives the data and the latch enable signal from the buffer 210 and transmits a signal of 2600 Hz transmitted from the counter station through the reception line to the level variable unit 230. In addition, the hybrid circuit 240 controls the level variable unit 230 and receives the output of the level variable unit 230 to transmit the level variable unit 230 to the counterpart station through a transmission line.

In addition, the signal detector 250 receives the signals FS and MCLK from the tone signal Dx of 2600 Hz and the buffer 210 of the codec and the filter 220, respectively. Thereafter, the signal detector 250 senses a frequency and a level of the received 2600 Hz signal, and applies a signal to the buffer 210 to set a corresponding bit when a valid signal exists in a specific region.

That is, the digital signal processor 252 in the signal detector 250 digitally processes the 2600 Hz tone signal Dr of the codec and filter 220 and the outputs FS and MCLK of the buffer 210.

Also, the read only memory (ROM) 254 provides data necessary for digital signal processing to the digital signal processor 252 under the control of the digital signal processor 252.

The latch 256 latches data of the ROM 254 and applies it to the buffer 210.

Next, random access memory (RAM) 258 stores the data of the ROM 254.

As described above, the present invention allows the signal detection unit 250 to digitally process a signal of 260 Hz received through an analog trunk so as to detect the signal and the bandwidth and level of the signal. Therefore, since the signal and the bandwidth and the level of the signal can be detected more accurately, the relay performance of the exchange can be improved.

Claims (3)

A tone generator 100 which receives a tone signal Dx by the other station and generates tone signals Dr, CLK, and FS during transmission; The trunk that receives the tone signals Dr, CLK, and FS from the tone generator 100 and supplies them to the other station, receives a signal transmitted from the other station, and applies the tone signal Dx to the tone generator 100. 200; The trunk 200 controls the trunk 200 to notify the other station of an abnormality in a line or a corresponding line. When the corresponding bit is set, the trunk 200 connects a voice path. Trunk signal detection and transmission device of the exchange comprising a processor (300) to place a call state. According to claim 1, The trunk 200, Tone signal (Dr, CLK, FS) of the tone generator 100, the control signal of the processor 300, and the latch signal according to the digital signal detection, respectively A buffer 210 that is applied and outputs each signal Dr, FS, and MCLK; Codecs and filters that receive tone signals Dr, FS, and MCLK from the buffer 210, convert them into analog signals, and output them, and convert the received signals into tone signals Dr and apply them to the tone generator 100. 220; In order to notify the other station of an abnormality in the line or the corresponding line, the channel blocking relay is driven to output the variable level of the analog signal from the codec and the filter 220, and to output the signal transmitted from the other station. A level variable unit 230 applied to the codec and the filter 220; Receives a signal from the buffer 210 and receives a signal transmitted from the counter station to the level variable section 230, and controls the level variable section 230 to apply the output of the level variable section 230 A hybrid circuit 240 for receiving and transmitting to a counter station; When the tone signal Dx of the codec and the filter 220 and the respective signals FS and MCLK of the buffer 210 are applied, a signal for setting a corresponding bit when a valid signal exists in a specific region is provided in the buffer 210. Trunk signal detection and transmission device of the exchange comprising a signal detection unit (250) applied to. The digital signal processor 252 of claim 2, wherein the signal detector 250 digitally processes the tone signal Dx of the codec and the filter 220 and the outputs FS and MCLK of the buffer 210. ); A ROM (254) for providing data for digital signal processing to the digital signal processor (252) under the control of the digital signal processor (252); A latch 256 for latching data of the ROM 254 and applying it to the buffer 210; Apparatus for detecting and transmitting trunk signal of an exchange comprising a RAM (258) for storing data of the ROM (254).