KR20000037650A - Adsl modem with internet phone - Google Patents

Abstract

PURPOSE: An ADSL(Asymmetric Digital Subscriber Line) modem with an internet phone is provided to combine an internet phone with an ADSL modem. CONSTITUTION: An ADSL modem with an internet phone comprises a key pad(53), a voice input and output handset(54), a phone controller(55), a codec(52), a packet converter(51), and a mixer/distributor(20). The key pad inputs a telephone number. The voice input and output handset receives and transmits voices. The phone controller outputs the voices according to a call connection. The codec outputs the voices by converting the data to digital data or by converting the received digital data to analog data. The packet converter converts the digital data to data of a packet type or the packet type data to the digital data. The mixer/distributor mixes and distributes the data from the packet converter or voice packet data of received data.

Description

ADSL modem for combination of internet phone module

The present invention relates to asymmetric communication modem, and in particular, an asymmetric digital subscriber line (hereinafter referred to as ADSL) which is used only for data communication. It is about a modem.

In general, the development of electronic technology has made rapid progress in the field of communication technology and computer, so that a new form of communication, data communication, is becoming a part of life.

Conventional voice-band modems can connect users end-to-end via a public switched telephone network (PSTN). However, the transmission throughput of the voice-band modem is limited to about 40 Kbps or less due to the 3.5 KHz bandwidth limited by the codes at the bandpass filter and PSTN interface points. On the other hand, the twisted-pair telephone subscriber loop of a computer user has more available bandwidth.

Depending on the length of the subscriber loop, the bandwidth at 50 dB of loss may be 1 MHz wide. Transmission systems according to local subscriber loops are generally referred to as digital subscriber lines (DSLs).

As consumers' demands for entertainment in digital formats (eg, video-on-dimend) and interactive electronic access to information (the Internet) increase, these demands are in fact traditional voice-bands. The modems have exceeded their capabilities. As a result, various transmission methods have been proposed, such as optical fiber links, direct satellite transmissions, and broadband coaxial cables to each home.

However, these methods are often too expensive and high bit rates using cable modems using coaxial cable connections to existing homes and twisted-pair of existing copper wires connecting home and telephone company central offices (COs). Cheaper alternatives such as digital subscriber lines (DSLs) have emerged.

Several digital subscriber line (DSL) technologies have been developed for different applications. The original 2B1Q digital subscriber line technology was used as the ISDN Basic Rate Access channel U-interface. High speed transmission digital subscriber line (HDSL) technology has been used as a repeaterless T1 (T1) service.

A prior art example using DSL technology transmits signals over a telephone loop defined by a standard specification as a communication system protocol that provides a low speed data stream from a residence to a CO (upstream) and a CO to a residence (downstream). Is an asymmetric digital subscriber line (ADSL).

Briefly, the ADSL method has a transmission speed of 1.5M bits (or 6M bits) per unit time (seconds) in the downward direction from the telephone station to the home using an existing telephone line (a twisted pair copper wire). Upwards, the term refers to an asymmetric communication method capable of maintaining a transmission rate of 16K bits per unit time (seconds).

The feature of the ADSL communication method is that it can be used by coexisting existing telephone or ISDN basic interface (2B + D) on the same telephone line. However, the ADSL communication method is proposed by "Bell Core" and uses a bandwidth of 400KHz at a frequency of 50-100KHz or more, which is a higher frequency band than the voice of a telephone.

In the case of data communication using the above-described ADSL, a general home distinguishes between a general telephone and an ADSL modem through a splitter called a splitter.

However, as described above, since the ADSL modem operates at a frequency higher than the voice band frequency, the ADSL modem is called a splitter because no suitable module is provided even though the voice-band modem or telephone call can operate at the same time. There is a problem that requires the use of expensive equipment.

SUMMARY OF THE INVENTION An object of the present invention for solving the above problems is to provide an asymmetric digital subscriber line modem for a combined internet phone that combines a module for internet telephony with a digital subscriber line modem that is used only for data communication.

1 is a block diagram of a general subscriber side using a conventional asymmetric digital subscriber line modem.

2 is an exemplary configuration diagram of an asymmetric digital subscriber line modem for a combined Internet phone according to the present invention.

<Explanation of symbols for main parts of drawing>

10: ADSL Physical Layer 20: Mixer / Distributor

30: asynchronous transfer mode layer 40: asynchronous transfer mode interface

51: packet converter / reducer 52: codec

53: keypad 54: voice input and output handset

55: phone controller

A feature of the present invention for achieving the above object is an asynchronous transmission mode interface as a matching unit for transmitting and receiving data with the telephone line network, and asynchronous transmission mode and transfer the data transmitted or received via the asynchronous transmission mode interface when receiving In an ADSL modem comprising an asynchronous transmission mode layer for converting asynchronous data into synchronous data, and an ADSL physical layer for performing digital data communication through the asynchronous transmission mode layer:

A keypad for inputting a telephone number, a voice input / output handset for listening to a voice of a caller or transmitting a voice of a speaker, and a telephone number input through the keypad determine whether a call connection with the other party is established. Accordingly, when a call connection is made, the phone controller outputs the voice generated through the voice input / output handset or delivers the received voice to the voice input / output handset, and digital data of the voice and the telephone number generated by the phone controller. Codec which converts the digital data to be output or received by converting it into an analog signal and delivers it to the phone controller side, and converts the digital data generated from the codec into a packet form to convert the output or received packet data into digital data. Converted and provided to the codec side A packet-transformer / reduction unit, and data generated from an ADSL physical layer and data generated from a packet-converter / reduction unit are mixed and delivered to the asynchronous transmission mode layer or a voice related packet is input from the data input from the asynchronous transmission mode layer. It is to include a mixer / distributor to separate and deliver to the packet converter / reducer.

An additional feature of the present invention for achieving the above object is that the phone controller operates by applying the H.323 protocol or SIP protocol.

The above objects and various advantages of the present invention will become more apparent from the preferred embodiments of the invention described below with reference to the accompanying drawings by those skilled in the art.

First, looking at the basics and features of ADSL in more detail, the ADSL standard allows for operation without affecting conventional voice telephony, such as conventional telephone service (POTS). The ADSL upstream channel provides only simple control functions or slow data transfer. High speed downstream channels provide higher throughput. This asymmetric information flow is desirable for applications such as video on demand (VOD).

ADSL modems are usually installed in pairs, one modem in the home and the other in the telephone company's central office, serving the home. Pairs of ADSL modems are connected to opposite ends of the same twist-pair, and each modem can only communicate with the modem at the other end of the twist-pair, and the central station can provide services (eg, movies, Internet, Direct connection).

In addition, a typical ADSL-based system is a server that can be deployed in a CO to provide movies or other data-intensive content, and a set-top that can receive and recombine data at the residence as well as send control information back to the CO. Contains a box. Meaningful display or use of downstream content typically requires a sustained data rate through the modem. Due to the continuing demand for data rates, ADSL systems are basically designed to run only at certain speeds under certain operating conditions. If the subscriber line meets the quality requirements, the ADSL modem can function, otherwise new line equipment must be installed or the line quality must be improved.

In particular, the ANSI standard ADSL requires up to 6Mbps transmission (downstream) and up to 640 Kbps reception (upstream) from the home over existing twisted-pair.

ADSL modems differ in many respects from the voice-band modems currently used for digital communication on telephone systems. Voice-band modems at home substantially change the digital bits to modulated tones within the voice-band (30 Hz-3.3 KHz), so that the signals can be transmitted as if they were ordinary voice signals generated in a telephone set. The voice-band modem at the receiving home then recovers digital bits from the received signal. Current ITU V-Series voice-band modem standards (eg, V.32 and V.34) require transmission at bit rates up to 33.6 Kbps; Even this is very slow for real-time video and very slow for Internet graphics. In contrast, ADSL modems operate in a higher frequency range than the voice-band; This enables higher data rates.

However, twist-pair subscriber lines increase distortion and loss with frequency and line length; Thus, the ADSL standard data rate is determined by the maximum rate obtainable for a length of subscriber lines of 9,000 feet (9kft) for 26 gauge lines, or 12kft for 24 gauge lines, for example.

Thus, the voice-band modem data rate is limited by at least the following factors: 1) The sampling rate of the line cards of the central station is only 8KHz; 2) low bit resolution of the A / D and D / A converters used on the line cards reduces the dynamic range; 3) the length of the subscriber line (twist-pair) and any combined electrical losses. Although the ADSL modem can avoid the above two factors, it also suffers from subscriber line length limitations and electrical losses.

As mentioned above, the basic matters and features of the ADSL have been described. As described above, the voice-band modem or the telephone call can operate simultaneously. Accordingly, the present invention is to provide an asymmetric digital subscriber line modem for the combined use of the Internet phone that can suppress the use of the splitter by coupling the module according to voice communication to the data communication dedicated modem according to the above-described ADSL method.

Hereinafter, a preferred embodiment according to the present invention will be described with reference to the accompanying drawings.

FIG. 2 is an exemplary configuration diagram of an asymmetric digital subscriber line modem for an Internet phone combined use according to the present invention. Asynchronous transmission mode layer 30 for asynchronously converting data transmitted or received through a) and converting asynchronous data into synchronous data upon reception; a keypad 53 for inputting a telephone number; It is determined whether a call connection with the other party is established through the voice input / output handset 54 for listening to the caller's voice or for transmitting the speaker's voice and the telephone number input through the keypad 53. When a connection is established, the voice generated through the voice input / output handset 54 is output or the voice received is received. The phone controller 55 which transmits to the output handset 54 and the voice and telephone number generated by the phone controller 55 are converted into digital data and the digital data is converted into an analog signal. The codec 52 which is transmitted to the phone controller 55 and the digital data generated by the codec 52 are converted into a packet form and output, or the data of the received packet form is converted into digital data and the codec 52 is converted into digital data. Packets and data generated in the ADSL physical layer 10 and the ADSL physical layer 10 that perform digital data communication through the asynchronous transmission mode layer 30 and the packet conversion / reduction unit 51 provided to the side. Voice of data input from the asynchronous transmission mode layer 30 by being mixed with data generated by the conversion / reduction unit 51 or transmitted to the asynchronous transmission mode layer 30 It is configured to separate the relevant packet to a mixing / splitter 20 for delivery to the packet transformation / reduction exchanger (51).

Looking at the preferred operation of the asymmetric digital subscriber line modem for the combined use of the Internet phone according to the present invention configured as described above are as follows.

The ADSL physical layer 10 connected to the computer outputs data generated by the computer as a digital signal using a frequency band having a bandwidth of 400 KHz at a frequency of 50 to 100 KHz or more.

On the other hand, if any user wants to make a telephone call in addition to the computer data communication described above, the user inputs the telephone number through the keypad 53 and the phone controller 55 accordingly configures the telephone line network through the configurations to be described below. To pass.

Then, when a call connection is made through the telephone network, a call is made with the other party connected through the voice input / output handset 54. At this time, the voice spoken by the user is transmitted to the codec 52 through the phone controller 55, and the codec 52 converts data on the voice and telephone number generated by the phone controller 55 into digital data. The data is converted and transferred to the packet converter / reducer 51.

The packet converter / reducer 51 converts the digital data generated by the codec 52 into the form of a packet and delivers it to the mixer / distributor 20. Accordingly, the mixer / distributor 20 mixes the data generated by the ADSL physical layer 10 and the data generated by the packet converter / reducer 51 and transfers the generated data to the asynchronous transmission mode layer 30.

In this case, the asynchronous transmission mode interface 40 transfers data through a matching unit for transmitting and receiving data with the telephone line network 30, the asynchronous transmission mode layer 30 converts the data input through the mixer / distributor 20 asynchronously Transfer to the asynchronous transmission mode interface 40 side.

The operation according to the received voice or call connection request is performed in the reverse direction of the above-described transmission process.

In addition, the phone controller 55 is operated by applying the H.323 protocol or SIP protocol.

By providing an asymmetric digital subscriber line modem for the combined use of the Internet phone operating as described above, there is an effect to enable telephone communication using the characteristics of the ADSL itself without using a splitter.

While the invention has been shown and described with respect to particular embodiments, it will be apparent to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the invention as set forth in the claims. Anyone can see it easily.

Claims (2)

An asynchronous transmission mode interface as a matching unit for transmitting and receiving data with a telephone line network, and asynchronous transmission mode of data transmitted or received through the asynchronous transmission mode interface, and converting asynchronous data into synchronous data upon reception. In an ADSL modem comprising an asynchronous transport mode layer and an ADSL physical layer for performing digital data communication through the asynchronous transport mode layer: A keypad for inputting a telephone number; A voice input / output handset for listening to a voice of a received caller or transmitting a voice of a speaker; It is determined whether the call connection with the other party is established through the telephone number input through the keypad, and when the call connection is established, the voice generated through the voice input / output handset is output or the voice received is transmitted to the voice input / output handset. A phone controller; A codec for converting data about voice and telephone number generated by the phone controller into digital data and outputting the digital data or converting the received digital data into an analog signal and transmitting the same to the phone controller; A packet converter / reducer for converting the digital data generated by the codec into a packet form and outputting the converted data into a packet form or providing the digital data to the codec side; And The data generated from the ADSL physical layer and the data generated from the packet conversion / reduction unit are mixed and transmitted to the asynchronous transmission mode layer or the voice related packet is separated from the data input from the asynchronous transmission mode layer to the packet conversion / reduction unit. An asymmetric digital subscriber line modem for use with an internet phone, characterized in that it comprises a mixer / distributor for transmitting. The method of claim 1, The phone controller is asymmetric digital subscriber line modem for the Internet phone, characterized in that the operating by applying the H.323 protocol or SIP protocol.