KR20010036511A - Subscriber modem apparatus of digital subscriber line system able to service multi-phone - Google Patents

Abstract

PURPOSE: An XDSL subscriber modem for multiphone service is provided to offer multiphone service as well as high-speed data service like Internet through a single telephone line by embodying a voice packet over ATM function based on an ATM AAL(ATM Adaptation Layer) protocol in a subscriber side XDSL modem. CONSTITUTION: An XDSL subscriber modem is composed of an XDSL transceiver(11), an ATM converter(12), an AAL2 processor(13), a PCM/ADPCM converter(14) and a CPU(15). The XDSL transceiver(11), after demodulating an analog signal for analog telephone service into a digital XDSL signal or converting an input digital XDSL signal into an analog signal, outputs the demodulated digital XDSL signal or the converted analog signal to an XDSL line card in a DSLAM(Digital Subscriber Line Access Multiplexer). The ATM converter(12) extracts an ATM cell signal from the demodulated digital XDSL signal or generates a digital XDSL signal using an input ATM cell signal. The AAL2 processor(13), converting the extracted ATM cell signal into a voice packet or an input voice packet into an ATM cell signal, outputs the converted packet or signal to the ATM converter(12). The PCM/ADPCM converter(14) converts the converted voice packet into an analog telephone service signal and provides it to a plurality of subscriber telephones. Also the PCM/ADPCM converter(14) converts an inputted analog telephone service signal into a voice packet and outputs it to the AAL2 processor(13). The CPU(15) controls the operations of each of the units of the XDSL subscriber modem.

Description

Subscriber modem apparatus of digital subscriber line system able to service multi-phone}

The present invention provides a voice packet over ATM function for a subscriber-side XDSL modem device of an XDSL system such as an asymmetric digital subscriber line (ADSL) system, a VDSL system, and a high bit rate-DSL (HDSL) system. The present invention relates to a subscriber modem apparatus of an XDSL system capable of providing a multi-phone service as well as providing a high-speed data service such as the Internet and a multi-phone service through a single phone line.

In general, XDSL systems use existing telephone lines to provide not only analog telephone service but also interactive services such as Video Of Demand (VOD) service and Internet service without interfering with the analog telephone service. It is a system that can provide high speed digital data service. It is a technology that increases bandwidth so that multimedia information such as voice, graphic and video can be simultaneously transmitted while using existing telephone lines. It is in the spotlight as a service network that can be delivered to subscribers.

The XDSL system includes a telephone exchanger 1 providing a T1 or E1 signal including an analog telephone service signal of 64 Kbps as shown in FIG. 1, an internet server 2 providing a high speed Internet service signal, and the telephone. Voice over ATM Line Card (3) for extracting telephone service signal of 64 Kbps from T1 or E1 signal provided by exchange 1 and converting into ATM cell signal, service signal provided by Internet server 2 A high speed data line card 4 for converting the ATM cell signal into an ATM cell signal, and an ATM back plane for switching the ATM cell signals converted from the voice over ATM line card 3 and the high speed data line card 4 5) an XDSL line card 6 which modulates an ATM cell signal switched in the ATM backplane 5 into a digital XDSL signal, converts it back into an analog signal, and then transmits the signal through an existing telephone line. XDSL which receives analog signal of DSLAM (7) and DSLAM (7) transmitted through telephone line and separates analog telephone service and digital data service to one phone and PC respectively. Subscriber modem 8;

As described above, in the conventional XDSL subscriber modem 8, one analog telephone service and digital data service are provided to the subscriber through one telephone line.

On the other hand, conventionally, there is a problem that the economic burden is small, such as using a high-speed optical cable or a special backbone network such as ISDN to implement a multi-phone service.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to implement a voice packet over ATM function based on ATM ATM Adaptation Layer (AAL) protocol provided by an AAL2 processor with an XDSL modem device of a subscriber side of an XDSL system. The present invention provides a subscriber modem device for an XDSL system capable of providing a multi-phone service as well as a high-speed data service such as the Internet through a single telephone line.

1 is a block diagram of a general digital subscriber line system;

Figure 2 is a block diagram of a subscriber modem device of a digital subscriber line system capable of multi-phone service according to the present invention.

<Explanation of symbols for main parts of drawing>

11: XDSL transceiver 12: ATM conversion unit

13: AAL2 processor 14: PCM / ADPCM conversion unit

15: CPU

The subscriber modem apparatus of the XDSL system capable of multi-phone service of the present invention for achieving the above object, demodulates the analog signal for analog telephone service transmitted over the telephone line from the DSLAM into a digital XDSL signal, the demodulated digital XDSL After extracting an ATM cell signal from the signal, the extracted ATM cell signal is converted into a voice packet through a voice packet over ATM function, and then the converted voice packet is converted into a 64Kbps PCM signal or an 32PCbps ADPCM signal. It is characterized in that the conversion to provide a plurality of subscriber phones.

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration and operation of the subscriber modem device of the XDSL system capable of multi-phone service according to the present invention.

2 is a block diagram of a subscriber modem device of an XDSL system capable of multi-phone service according to the present invention, that is, an XDSL subscriber modem 8, transmitted from a XDSL line card 6 in a DSLAM 7 via a telephone line. XDSL transceiver 11 for demodulating an analog signal for analog telephone service into a digital XDSL signal or converting an input digital XDSL signal into an analog signal and outputting it to the XDSL line card 6 in the DSLAM 7 through a telephone line. And an ATM converter 12 for extracting an ATM cell signal from the digital XDSL signal demodulated by the XDSL transceiver 11 or generating a digital XDSL signal from an input ATM cell signal, and in the ATM converter 12. An AAL2 processor 13 for converting the extracted ATM cell signal into a voice packet, or converting an input voice packet into an ATM cell signal and outputting the same to the ATM converter 12; and in the AAL2 processor 13 Converts voice packets into analog telephone service signals, which are 64Kbps PCM or 32Kbps ADPCM signals, to be provided to multiple subscriber phones, or converts 64Kbps PCM or 32Kbps ADPCM signals, which are input from subscriber phones, into voice packets. And a PCM / ADPCM conversion unit 14 outputted to the AAL2 processor 13, and a CPU 15 for controlling the operations of the respective building blocks 11-14.

The AAL2 processor 13 provides an ATM AAL protocol that supports a voice packet over ATM function that enables multiple analog telephone services.

The operation of the XDSL subscriber modem 8 according to the present invention configured as described above is as follows.

First, when an analog telephone service signal for providing multi-phone service is transmitted from the DSLAM 7 of the XDSL system to the XDSL subscriber modem 8 through a telephone line, the DSLAM 11 of the XDSL transceiver 11 in the XDSL subscriber modem 8 is transmitted. 7) The analog signal for analog telephone service transmitted from the XDSL line card 6 through the telephone line is demodulated into a digital XDSL signal, and then the ATM converter 12 demodulates the digital XDSL demodulated by the XDSL transceiver 11. Extract the ATM cell signal from the signal.

Subsequently, the AAL2 processor 13 converts the ATM cell signal extracted by the ATM converter 12 into a voice packet through a voice packet over ATM function, and the PCM / ADPCM converter 14 converts the converted voice packet. It is converted into multiple analog telephone service signals, which are 64 Kbps PCM signals or 32 Kbps ADPCM signals, to be provided to multiple subscriber phones.

On the contrary, when the XDSL subscriber modem 8 transmits an analog telephone service signal for receiving a multi-phone service to the DSLAM 7 of the XDSL system via a telephone line, the PCM / ADPCM conversion unit 14 uses a plurality of subscriber phones. A plurality of analog telephone service signals, which are 64 Kbps PCM or 32 Kbps ADPCM signals, are collected and converted into voice packets. The AAL2 processor 13 converts the voice packets converted by the PCM / ADPCM conversion unit 14 into ATM. The signal is converted into a cell signal and output to the ATM converter 12.

Subsequently, the ATM converter 12 generates a digital XDSL signal using the ATM cell signal converted by the AAL2 processor 13 and transmits the digital XDSL signal to the XDSL transceiver 11, and the XDSL transceiver 11 transmits the generated digital XDSL signal. The signal is converted into an analog signal and output to the XDSL line card 6 in the DSLAM 7 through a telephone line.

As described above, the present invention, by configuring the subscriber modem device of the XDSL system to implement the voice packet over ATM function by the ATM AAL protocol provided by the AAL2 processor, a high-speed data service such as the Internet by one telephone line Of course, there is an effect that can provide a multi-phone service.

Claims (1)

DSLAM (7) consisting of telephone exchange (1), Internet server (2), voice over ATM line card (3), high speed data line card (4), ATM backplane (5), XDSL line card (6) And the XDSL system comprising the XDSL subscriber modem 8, The XDSL subscriber modem 8 demodulates the analog signal for analog telephone service transmitted from the XDSL line card 6 in the DSLAM 7 via a telephone line into a digital XDSL signal, or converts the input digital XDSL signal into an analog signal. ATM cell signal is extracted from the XDSL transceiver 11 and the digital XDSL signal demodulated by the XDSL transceiver 11 through the telephone line and outputted to the XDSL line card 6 in the DSLAM 7. An ATM converter 12 that generates a digital XDSL signal from an ATM cell signal, and converts an ATM cell signal extracted by the ATM converter 12 into a voice packet or converts an input voice packet into an ATM cell signal; Converts the AAL2 processor 13 outputted to the ATM converter 12 and the voice packet converted by the AAL2 processor 13 into an analog telephone service signal which is a PCM of 64 Kbps or an ADPCM signal of 32 Kbps. A PCM / ADPCM converter 14 for converting an analog telephone service signal, which is provided to a subscriber phone of the subscriber phone or a 64 Kbps PCM or 32 Kbps ADPCM signal inputted from the subscriber phone, into a voice packet and outputs the voice packet to the AAL2 processor 13; A subscriber modem apparatus of a digital subscriber line system capable of multi-phone service, characterized in that it comprises a CPU (15) for controlling the operation of the components blocks (11 to 14).