KR20010057813A - Hybrid Exchange System Using ADSL Subscriber Link Interface - Google Patents

Abstract

PURPOSE: A hybrid exchange system for interfacing with ADSL(Asymmetric Digital Subscriber Line) subscriber link is provided to accommodate an ADSL subscriber without change in a loop of an existing subscriber terminal, and simultaneously supplies a voice service and a high-speed data service to the subscriber. CONSTITUTION: An ADSL subscriber interface unit(30) enables interface between the subscriber terminal and an ADSL subscriber link via an NT(Network Terminator), and thereby provides the voice service and high-speed data service at the same time. The unit(30) provides the voice service via a line exchange switch(40). The unit(30) provides the high-speed data service via an ATM(Asynchronous Transfer Mode) switch(50). The line exchange switch(40) performs a switching operation of the analog voice data exchanged between the interface unit(30) and a PSTN/ISDN network. The ATM switch(50) carries out a switch operation of the high-speed digital data exchanged between the interface unit(30) and an ATM network.

Description

Hybrid Exchange System Using ADSL Subscriber Link Interface}

The present invention relates to a complex switching system for asymmetric digital subscriber line (ADSL) subscriber link matching, and in particular, to implement circuit switching and ATM switching technology by implementing an ADSL subscriber board without installing a separate digital subscriber line access multipelexer (DSLAM). The present invention relates to a complex switching system for ADSL subscriber link matching, which can simultaneously provide general voice and high speed data services.

In general, Asymmetric Digital Subscriber Line (ADSL) is a new modem technology that enables multimedia high-speed data communication using a conventional two-wire subscriber telephone line. A subscriber telephone line receives 6Mbps to 8Mbps and 640kbps to 1Mbps. Transmission is possible.

In addition, subscribers using the corresponding ADSL (hereinafter referred to as 'ADSL subscribers') can receive multimedia video service through the service provider and the data transmission / reception and service provider while using a regular telephone in the home. It is expected to be an important means in the business of providing information using video and multimedia.

However, in order to provide an ADSL service through a subscriber's telephone line, a separate ADSL service system that can be interlocked with an exchange system was required. The ADSL service system is attached to simultaneously provide voice and high-speed data services, which are ADSL services. As shown in FIG. 1, a digital subscriber line access multipelexer (DSLAM) 11, a splitter 12, and an edge router 13 are provided.

The DSLAM 11 matches an ADSL subscriber link connected to a subscriber station (PC, POTS / ISDN) through a network terminator (NT), and the splitter 12 connects the DSLAM 11 and a network terminator ( It is located between NT) and separates voice and high-speed data transmitted from subscriber station and matches with corresponding Public Switched Telephone Network (PSTN) / Integrated Services Digital Network (ISDN) network.

The edge router 13 processes protocols related to routing and authentication for high-speed data traffic such as PPP / IP / ATM (Point to Point Protocol / Internet Protocol / Asynchronous Transfer Mode) generated from an ADSL subscriber.

In the conventional ADSL service system configured as described above, the DSLAM 11 and the edge router 13 provide high-speed data service by interworking with the ATM network, and in the case of general voice, the DSLAM 11 does not go through the DSLAM 11. Through the LPF (Low Pass Filter) in the splitter 12 located in front of the (11) to match the PSTN / ISDN network to provide a corresponding voice service.

As described above, in the related art, a separate DSLAM has to be installed in order to provide a high speed data service for an ADSL subscriber link, and in order to simultaneously provide general voice and high speed data service through the corresponding ADSL subscriber link, The downside was that a separate splitter was required to separate voice and high-speed data from the DSLAM front end.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and its object is to accommodate an ADSL subscriber link requiring general voice and high-speed data service without installing a separate DSLAM, without changing the loop of an existing subscriber station. In addition to accommodating ADSL subscribers, it is possible to simultaneously provide general voice and high-speed data services to the corresponding ADSL subscribers.

1 is a diagram illustrating a schematic service network of a conventional ADSL service system.

2 illustrates a schematic service network of a composite switching system for registering ADSL subscriber links in accordance with the present invention.

FIG. 3 is a detailed block diagram of the ADSL subscriber matching device of FIG. 2; FIG.

Explanation of symbols on the main parts of the drawings

20: edge router 30: ADSL subscriber matching device

31: ADSL Subscriber Board 31-1: Splitter

31-2: subscriber link matching unit 31-2a: reception filter

31-2b: Transmission filter 31-2c: AFE unit

31-2d: DSP 31-3, 32-3: control unit

32: upper control board 32-1: ATM cell processing unit

32-2: concentrator 33: ADSL modem

34: SLI board 40: circuit switched switch

50: ATM switch

A feature of the present invention for solving the above object is a circuit switched switch for switching the general voice for the PSTN / ISDN network; An ATM switch for switching high speed data for an ATM network; While providing a general voice and high-speed data service by matching the ADSL subscriber link connected to the subscriber terminal through the network termination device, and provides a general voice service by matching with the PSTN / ISDN network through the circuit switched switch, the ATM switch In order to provide a complex switching system for the DS subscriber link matching including the ADSL subscriber matching device that provides a high-speed data service by matching with the ATM network.

Here, the ADSL subscriber matching device includes: an ADSL subscriber board for matching voice and high-speed data simultaneously by matching with an ADSL modem and an SLI board; And an upper control board that matches high-speed data transmitted / received to and from the ATM network through the ADSL subscriber board and the ATM switch in conjunction with an edge router that processes routing and protocols for the ADSL subscriber.

The ADSL subscriber board includes: a splitter for separating and processing general voice and high-speed data input through an ADSL modem; A subscriber link matching unit for matching the ADSL subscriber link through the splitter and performing a corresponding high speed data processing; And controlling the overall operation of the ADSL subscriber board and matching with the upper control board, wherein the subscriber link matching unit provides a UTOPIA-II interface for matching with the ATM network through the upper control board. DSP; An AFE unit for performing A / D conversion and D / A conversion between the DSP and the 2-wire tip / ring terminal to match analog voice and high speed data; The apparatus may further include a transmission filter and a reception filter for filtering analog data transmitted and received between the splitter and the AFE unit.

Further, the upper control board includes a concentrator for converging an ADSL subscriber link; ADSL subscriber board converts high-speed digital data received through ADSL subscriber board into ATM cell to match ATM network through ATM switch, or converts ATM cell received from ATM network through ATM switch and concentrator into digital data ATM cell processing unit for transmitting to; A control unit for controlling the overall operation of the upper control board is characterized in that it further comprises.

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

In the present invention, the ADSL subscriber is accommodated without installing a separate DSALM and the corresponding ADSL subscriber link is matched to provide not only a high-speed data service but also a general voice service at the same time. A hybrid exchange system (HES) includes an ADSL subscriber matching device 30, a circuit switched switch 40, and an ATM switch 50, as shown in FIG.

The ADSL subscriber matching device 30 matches the ADSL subscriber link connected to the subscriber terminal (POTS / ISDN, PC, TV) through the network termination unit (NT) to simultaneously provide voice and high-speed data service, but the circuit switched switch Through 40 to match the PSTN / ISDN network to provide a general voice service, and through the ATM switch 50 to match with the ATM network to provide a high-speed data service.

The circuit switched switch 40 switches the analog voice data transmitted and received between the ADSL subscriber matching device 30 and the PSTN / ISDN network, and the corresponding ATM switch 50 switches between the ADSL subscriber matching device 30 and the ATM network. Switching on high-speed digital data transmitted and received at

On the other hand, the ADSL subscriber matching device 30 simultaneously provides voice and high-speed data services to the ADSL subscriber side, ADSL subscriber without changing the loop of the existing subscriber station (POTS / ISDN) and installation of DSLAM to the carrier side In order to accommodate the above, a detailed configuration of the ADSL subscriber matching device 30 for this purpose is matched with the ADSL modem 33 and the Subscriber Line Interface (SLI) board 34 as shown in FIG. Through the ADSL subscriber board 31 and the ATM switch 50 in association with the ADSL subscriber board 31 for simultaneously processing voice and high-speed data, and the edge router 20 for routing and protocols for the ADSL subscriber. And an upper control board 32 that matches high-speed data transmitted and received with the ATM network.

At this time, the ADSL subscriber board 31 and the upper control board 32 transmit and receive high-speed data through the UTOPIA-II bus (Universal Test & Operations Physical Interface for ATM level II) bus matching method, and the status by the maintenance block Managed.

In addition, the corresponding ADSL subscriber board 31 provides a high speed data service by providing a general voice service through the SLI board 34 and matching with the upper control board 32, and is input through the ADSL modem 33. Splitter 31-1 for separating and processing normal voice and high-speed data, and subscriber link matching unit 31- for matching the ADSL subscriber link through the splitter 31-1 and performing the corresponding high-speed data processing. 2) and a controller 31-3 that controls the overall operation of the ADSL subscriber board 31 and matches the upper control board 32. FIG.

Here, the subscriber link matching unit 31-2 includes a digital signal processor (DSP) 31-2d (DSP) that provides a UTOPIA-II interface for matching with an ATM network through the upper control board 32, and an analog voice. And analog-to-digital (A / D) and digital-to-analog (D / A) conversion between the DSP 31-2d and 2-wire Tip / Ring terminals to match high-speed data. An analog front end (AFE) unit 31-2c, a splitter 31-1, and a transmission filter 31-2b for performing filtering on the analog data transmitted and received between the AFE unit 31-2c and receiving. A filter 31-2a is further included.

Meanwhile, the upper control board 32 converts the high-speed digital data received through the ADSL subscriber board 31 into an ATM cell, matches the ATM network through the ATM switch 50, or the ATM switch 50 from the ATM network. And an ATM cell processing unit 32-1 for converting the ATM cell received through the collecting unit 32-2 into digital data and transmitting the same to the ADSL subscriber board 31, and the collecting unit 32- for collecting the ADSL subscriber link. 2) and a control unit 32-3 for controlling the overall operation of the upper control board 32.

The voice and high-speed data service processing operation of the HES according to the present invention configured as described above will be described below.

First, the ADSL subscriber board 31 is located in the ADSL subscriber matching device 30 of the corresponding complex switching system (HES), and is connected to an ATM network through an ATM switch 50 to request an ADSL subscriber (high speed data service). PC and TV) and at the same time through the circuit-switched switch 40 to accommodate the general subscriber (POTS / ISDN) requesting the general voice service in conjunction with the PSTN / ISDN network.

At this time, the transmission rates that can be implemented in the high-speed data service for the corresponding ADSL subscriber is shown in Table 1 below.

Recommendation Recommendation G.992.1 of the ITU-T Recommendation G.991.2 of the ITU-T division Speed Speed Speed Top speed Downstream (Kbps) 32 8192 64 1536 Upstream (Kbps) 32 1024 32 512

Here, the transmission rate presented in the G.992.1 Recommendation of the relevant ITU-T is the serviceable transmission rate at the ADSL full rate, and the transmission rate presented in the G.991.2 Recommendation of the relevant ITU-T is the serviceable transmission in the implementation of Universal ADSL. As speed, Downstream means transmission from the switching system to the ADSL subscriber, and Upstream means transmission from the ADSL subscriber to the switching system.

On the other hand, the splitter 31-1 located on the corresponding ADSL subscriber board 31 is 4khz or less for analog voice signal for plain old telephone service (POTS) and 50khz or less for analog signal for ISDN terminal. In the low frequency band of the filter is transmitted to the SLI board (34).

In this case, the splitter 31-1 may be implemented separately for a general telephone and an ISDN terminal, or may be integrated into a band corresponding to an ISDN terminal and implemented as one.

The ADSL subscriber board 31 interworks with the upper control board 32 through the UTOPIA-II and the maintenance block, and then the ATM switch 50 and the edge router 20 through the upper control board 32. It will work with.

Here, the ATM switch 50 is located inside the complex switching system (HES) to transmit traffic for the high-speed data, the edge router 20 is located outside the complex switching system (HES) to the ADSL subscriber It handles routing and authentication related protocols for high speed data traffic such as PPP / IP / ATM.

As described above, the composite switching system according to the present invention is capable of accommodating ADSL subscribers without the installation of DSLAM, and the ADSL subscriber boards accommodating the ADSL subscribers can be distributed and accommodated in the switching subsystem in the composite switching system. As a result, subscribers can use general voice and high-speed data services, and service providers can accommodate ADSL subscribers without changing the loop for the existing general subscriber station (POTS / ISDN).

In addition, in the complex exchange system according to the present invention, it is possible to integrate billing, statistics, and management functions provided by the existing exchange system, and to provide additional services such as caller information, and to control the ADSL subscriber board. It is possible to monitor the service operation by connecting a debugging port to the duplex port, and connect the Telecommunications Management Network (TMN) through Simple Network Management Protocol (SNMP), which is a simple polling protocol, to connect the Windows-based browser. It is possible to provide the service.

In addition, the embodiments according to the present invention are not limited to the above-described embodiments, and various alternatives, modifications, and changes can be made within the scope apparent to those skilled in the art.

As described above, the present invention can accommodate the ADSL subscriber without changing the loop of the existing subscriber station by accommodating the ADSL subscriber link requiring a general voice and high-speed data service without installing a separate DSLAM, As a result, it is possible to simultaneously provide general voice and high-speed data services to the corresponding ADSL subscribers.

Claims (5)

A circuit switched switch for switching the general voice for the PSTN / ISDN network; An ATM switch for switching high speed data for an ATM network; While providing a general voice and high-speed data service by matching the ADSL subscriber link connected to the subscriber terminal through the network termination device, and provides a general voice service by matching with the PSTN / ISDN network through the circuit switched switch, the ATM switch The ADSL subscriber link matching complex switching system for providing a high-speed data service by matching with the ATM network through. The method of claim 1, The ADSL subscriber matching device includes: an ADSL subscriber board that matches an ADSL modem and an SLI board and simultaneously processes voice and high speed data; ADSL subscriber link matching, comprising: an upper control board for matching high-speed data transmitted / received to / from an ATM network through the ADSL subscriber board and an ATM switch in association with an edge router that processes routing and protocols for an ADSL subscriber. Complex exchange system. The method of claim 2, The ADSL subscriber board includes: a splitter for separating and processing general voice and high-speed data input through an ADSL modem; A subscriber link matching unit for matching the ADSL subscriber link through the splitter and performing a corresponding high speed data processing; And a control unit for controlling the overall operation of the ADSL subscriber board and matching with the upper control board. The method of claim 3, wherein The subscriber link matching unit includes: a DSP providing a UTOPIA-II interface for matching with an ATM network through an upper control board; An AFE unit for performing A / D conversion and D / A conversion between the DSP and the 2-wire tip / ring terminal to match analog voice and high speed data; And a transmission filter and a reception filter for performing filtering on the analog data transmitted and received between the splitter and the AFE unit. The method of claim 2, The upper control board includes a concentrator for converging an ADSL subscriber link; ADSL subscriber board converts high-speed digital data received through ADSL subscriber board into ATM cell to match ATM network through ATM switch, or converts ATM cell received from ATM network through ATM switch and concentrator into digital data ATM cell processing unit for transmitting to; And a control unit for controlling the overall operation of the upper control board.