KR20020039930A - Sdsl subscriber system for supporting voice and data transmission simultaneously - Google Patents

Abstract

PURPOSE: An SDSL(Symmetric Digital Subscriber Line) subscriber system for simultaneously supporting the transmission of voices and data is provided to divide a voice signal and a data signal according to a frequency band by a splitter and simultaneously transmit the voice signal and the data signal. CONSTITUTION: An SDSL subscriber device(110) connects to a user computer(170), and controls the transmission of voices and data through 2 SDSL lines. A splitter(200) connects between the SDSL subscriber device(110) and a telephone terminal(180). The splitter(200) divides the signal transmitted from the telephone terminal(180) by a frequency bandwidth, transmits a signal having a frequency band corresponding to a voice signal to a telephone(210), and transmits a signal having a frequency band corresponding to a data signal to the SDSL subscriber device(110). The splitter(200) inserts a signal transmitted from the telephone(210) into the signal transmitted from the SDSL subscriber device(110) and transmits the signal to the telephone terminal(180).

Description

SDSL subscriber system supporting voice and data transmission at the same time {SDSL SUBSCRIBER SYSTEM FOR SUPPORTING VOICE AND DATA TRANSMISSION SIMULTANEOUSLY}

The present invention relates to an SDSL subscriber system that simultaneously supports voice and data transmission. More specifically, the present invention relates to an SDSL subscriber system that splits and transmits a voice signal and a data signal by a splitter. The present invention relates to an SDSL subscriber system that simultaneously supports voice and data transmission.

DSL is a technology that enables high-speed information transfer to homes and small businesses over conventional copper telephone lines. Among them, ASL (Asymmetric Digital Subscriber Line) allocates most of the full-duplex bandwidth to the downward direction for transmitting data to the user side and relatively little bandwidth for the upward direction for transmitting data from the user. Asymmetric ". On the other hand, the symmetric digital subscriber line (SDSL) is a technique for allocating bandwidth of the same size in the upward direction and the downward direction, and for this reason, it is called "symmetry".

The configuration of the subscriber system of the SDSL will be described with reference to FIG. 1.

1 is a block diagram of a conventional SDSL subscriber system.

The SDSL subscriber device 10 includes an Ethernet transformer 20, a bridge chip 30, an SDSL chip 40, a line state measuring circuit 50, and an SDSL transformer 60 therein, and a user computer. 70 is connected to the Ethernet transformer 20 inside the SDSL subscriber device 10 via two phone lines 90, and the telephone terminal 80 is also connected to the SDSL subscriber device via two phone lines 90. (10) The configuration is connected to the internal SDSL transformer 60.

The Ethernet transformer 20 performs a function of amplifying and separating an Ethernet data signal to prevent distortion of the signal, and the bridge chip 30 recognizes the Ethernet data signal received from the user computer 70 by the SDSL chip 40. Converts a serial data signal received from the SDSL chip 40 into an Ethernet data signal that the user computer 70 can recognize. do.

The SDSL chip 40 converts the serial data signal received from the bridge chip 30 into the 2B1Q signal form and converts the 2B1Q signal received from the telephone terminal 80 into the serial data signal form and transfers the serial data signal to the bridge chip 30. It performs the function.

In addition, the line state measuring circuit 50 has a function of transmitting various information about the telephone line state to the SDSL chip 40 including a filter function and the like, and the SDSL transformer 60 supplies SDSL signals in the frequency band of 0 to 400 KHz. It has the function of amplifying for long distance transmission and controlling the impedance of primary and secondary side of transformer to prevent signal distortion.

In such a conventional SDSL subscriber system, it is difficult to simultaneously transmit a voice signal (i.e., use of a telephone) together with a data signal. This is because the conventional SDSL subscriber system generally transmits data signals as SDSL signals in the 0 to 400 KHz frequency band, and since the frequency band of the voice signal is 0 to 4 KHz, there is a problem of overlapping bandwidth with each other. .

In addition, even if a splitter for separating the voice signal and the data signal according to the frequency band, the signal of the 0 ~ 4KHz frequency band also includes the data signal of the same frequency band and is transmitted to the telephone, so the noise is excessive during telephone calls. There is a problem in transmitting the data signal and the voice signal at the same time because the break occurs in the middle.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide an SDSL subscriber system capable of simultaneously transmitting voice and data by splitting and transmitting voice and data signals according to frequency bands by a splitter. .

It is another object of the present invention to provide a SDSL subscriber system without noise problems during a telephone call by transmitting a data signal by blocking a signal of a frequency band of a voice signal by a dedicated SDSL voice transformer.

1 is a block diagram of a conventional SDSL subscriber system.

2 is a block diagram of an SDSL subscriber system supporting voice transmission and data transmission simultaneously according to the present invention.

* Description of the symbols for the main parts of the drawings *

100: SDSL subscriber system 110: SDSL subscriber device

120: Ethernet transformer 130: bridge chip

140: SDSL chip 150: line state measurement circuit

160: SDSL Voice Transformer 162: Dual Diode

164: Polyswitch / Thyristor 170: User Computer

180: telephone terminal 190: telephone line

200: splitter 210: phone

In order to achieve the object as described above, the present invention is connected to a user computer, SDSL subscriber apparatus for controlling the transmission of voice and data over two SDSL lines; And a splitter connected between the SDSL subscriber station and the telephone terminal, wherein the splitter separates a signal transmitted from the telephone terminal by a frequency bandwidth, and transmits a signal having a frequency band corresponding to a voice signal to a telephone and a data signal. A signal having a frequency band corresponding to the present invention is transmitted to an SDSL subscriber device, and inserts a signal transmitted from a telephone into a signal transmitted from the SDSL subscriber device and provides a function of transmitting to a telephone terminal. do.

Here, the SDSL subscriber device preferably includes an SDSL voice-only transformer having a frequency filtering function for blocking and transmitting a signal having a frequency band of the voice signal.

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

2 is a block diagram of an SDSL subscriber system supporting simultaneous voice and data transmission according to the present invention.

The SDSL subscriber system 100 according to the present invention includes an SDSL subscriber device 110, a user computer 170, a telephone terminal 180, a telephone 210, and a splitter 200.

SDSL subscriber device 110 includes Ethernet transformer 120, bridge chip 130, SDSL chip 140, line state measurement circuit 150, dual diode 162, SDSL voice only transformer 160 and Polyswitch / Thyristor 164 is provided.

The user computer 170 is connected to the Ethernet transformer 120 inside the SDSL subscriber device 110 via two phone lines 190, and is split between the telephone terminal 180 and the SDSL subscriber device 100. 200 is also connected via two phone lines 190, and splitter 200 is also configured to be connected to phone 210.

Here, the Ethernet transformer 120, the bridge chip 130, the SDSL chip 140 and the line state measuring circuit 150 have the same functions as the components named by the same name in the conventional SDSL subscriber device 10. The description thereof will be omitted.

In addition, as disclosed in patent application No. 2000-66705 filed November 10, 2000 by the same applicant as the present applicant and entitled “SDSL subscriber device with lightning protection”, the dual diode 162 ) Blocks the abnormal signals generated due to the changed polarity signal or the small noise, and the polyswitch / thyristor 164 performs the function of blocking the overvoltage and overcurrent signals.

In the present invention, a conventional SDSL voice-only transformer 160 different from the conventional SDSL transformer 60 is used. The term "voice-only" means a transformer suitable for transmitting a voice signal simultaneously with a data signal. The transformer will be installed in all of the SDSL subscriber devices of the plurality of subscribers in which the present invention is carried out.

The SDSL voice-only transformer 160 is a high pass filter that blocks a signal having a frequency band of 0 to 4 KHz (ie, a voice signal) from the transmitted signal and passes a signal of the remaining bandwidth (ie, a data signal). Performs the function of.

The splitter 200 separates signals transmitted from the telephone terminal 180 according to the frequency bandwidth, so that a signal having a frequency band of 0 to 4 KHz (ie, a voice signal) is transmitted to the telephone 210, and the frequency band is 4 KHz. The above signal (ie, data signal) performs a function of transmitting to the SDSL subscriber device 110.

In addition, the splitter 200 inserts a signal (i.e., a voice signal) transmitted from the telephone 210 into a signal (i.e., a data signal) transmitted from the SDSL subscriber device 110 to simultaneously call a voice signal and a data signal. Transmit to terminal 180.

Hereinafter, a process in which voice and data are separated and transmitted in the SDSL subscriber system 100 which simultaneously supports voice and data transmission according to the present invention will be described.

When a signal is transmitted through the telephone terminal 180 (voice signal and data signal alone as well as a mixture of voice and data signals can be transmitted), the splitter 200 is a signal of frequency 4KHz or less (that is, voice signal ) Transmits the call to the telephone 210 to make a telephone call, and transmits a signal having a frequency of 4 KHz or more (ie, a data signal) to the SDSL subscriber device 110 so that the user computer 170 transmits and receives data.

In this way, since the splitter 200 separates the data signal and the voice signal and transmits the data signal and the voice signal to the SDSL subscriber station 110 and the telephone 210, respectively, it is possible to simultaneously support data and voice transmission.

The present invention also solves the problem of noise during a telephone call in the conventional SDSL subscriber system, which is due to the high pass filtering function of the SDSL voice-only transformer 160.

In the case of the conventional SDSL subscriber system, even if the splitter is used to transmit only the signal of the frequency band below 4KHz to the telephone, the signal of the frequency band below 4KHz also includes the data signal. Was to occur.

However, according to the present invention, since a signal having a frequency band of 4 KHz or less has already been removed from the SDSL voice-only transformer of another SDSL subscriber system, the data signal coming through the telephone terminal 180 has been removed. Signals below 4 KHz do not contain data signals. As a result, a signal having a frequency of 4KHz or less transmitted to the telephone 210 includes purely a voice signal, so that noise is not generated during a telephone call.

While the invention has been particularly shown and described with reference to the above embodiments, it has been used for the purpose of illustration and those of ordinary skill in the art to which the invention pertains have the spirit and spirit of the invention as defined in the appended claims. Various modifications can be made without departing from the scope.

As described above, according to the present invention, voice and data can be simultaneously transmitted by splitting and transmitting the voice signal and the data signal according to the frequency band by the splitter, and the signal of the frequency band of the voice signal by the SDSL voice-only transformer. It is effective to implement SDSL subscriber system that has no problem of noise during telephone call by transmitting data signal by blocking.

Claims (3)

An SDSL subscriber device coupled to the user computer for controlling the transmission of voice and data over two SDSL lines; And A splitter connected between the SDSL subscriber device and a telephone terminal, The splitter divides a signal transmitted from the telephone terminal by a frequency bandwidth, transmits a signal having a frequency band corresponding to a voice signal to a telephone, and transmits a signal having a frequency band corresponding to a data signal to the SDSL subscriber device. And inserting a signal transmitted from the telephone into the signal transmitted from the SDSL subscriber apparatus and transmitting the signal to the telephone terminal. The method of claim 1, The SDSL subscriber system includes an SDSL voice-only transformer having a frequency filtering function for blocking and transmitting a signal having a frequency band of the voice signal. The method according to claim 1 or 2, And the frequency band of the voice signal is 4 KHz or less.