KR20020037220A - Method and apparatus of Digital Subscriber Line Access Multiplexer using IP addresses - Google Patents

Abstract

PURPOSE: A DSLAM(Digital Subscriber Line Access Multiplexer) using an IP address method is provided to control data traffic and voice traffic in an IP method, so as to stably transceive voice information and data information as well as reduce the number of ATM exchanges. CONSTITUTION: A subscriber voice traffic interface module(115) comprises as follows. Many voice traffic interfaces(110) are connected with voice traffic transmitted from many subscribers. A signal processing module(120) connected to the voice traffic interfaces(110) uses a DSP(Digital Signal Processing) for compressing the voice traffic. A voice traffic IP address provider(130) allows an IP address to the compressed voice traffic, and transmits the voice traffic to an ATM exchange. A subscriber data traffic interface module(118) comprises as follows. Many data traffic interfaces(140) are connected with data traffic transmitted from many subscribers. A data traffic IP address provider(150) allows an IP address to the data traffic, and transmits the data traffic to the ATM exchange.

Description

DS and multiplexing method using IP address method {Method and apparatus of Digital Subscriber Line Access Multiplexer using IP addresses}

The present invention relates to a DLAM (Digital Subscriber Line Access Multiplexer) included in a network communication device, more specifically, a network environment for transmitting voice signals and data using a DSL (Digital Subscriber Line).

In the recent information age, many people have paid attention to information processing and information sharing methods, and accordingly, the field of communication has been remarkably developed.

Communication or Correspondence is the act of transferring information to an opponent through an intermediate medium between two geographically remote devices. Code information such as military code, text information such as fax, and telephone Refers to an activity of transmitting and receiving voice information and video information such as broadcasting by voice, wireless, optical or other electronic methods, and devices and devices required to perform such activities.

For example, exchanging information through communication media such as telephone networks, leased lines, satellites, broadcasts, antennas, etc., between geographically separated systems can all be examples of communications. The exchange of information is called computer communication.

In addition, a network and a communication structure in which two or more devices are connected based on a common purpose of data communication are called networks. Among them, a computer network using a computer is connected to the general public due to the recent spread of personal computers. It is rapidly becoming popular.

In order to construct such a network system, not only computer systems that are separated from each other but also transmission apparatuses and exchange apparatuses that connect them, an electronic communication line is required, and they are connected to each other to form a network to enable data communication.

In particular, although various methods are used as the communication line, DSL (Digital Subscriber Line) has the advantage of easily providing the public with a high-speed communication service of multimedia information including data and voice information in recent years as well as domestically. ) Is in the spotlight.

These DSL technologies are classified into several types such as VDSL (Very High Bit Rate DSL), SDSL (Symmetric DSL), HDSL (High Bit Rate DSL), and IDSL (ISDN DSL) depending on the speed of upstream and downstream. For this reason, DSL is commonly referred to as multiDSL (xDSL).

A process of communicating data information using a terminal and voice information using a phone in a DSL network environment including a general DSLAM will be described in detail with reference to FIG. 1.

Since the general data information and voice information transmission process through DSL is connected in the form of point-to-multipoint like a voice telephone network, the physical configuration is similar.

This physical configuration is largely divided into a Customer Premises Equipment (CPE), a Central Office (Co), and a Network Service Provider (NSP).

In the DSL network environment, the process of transmitting data traffic through the terminal and voice traffic through the phone from the subscriber service (CPE) part to the network service provider (NSP) will be described first. Or, subscribers corresponding to businesses transmit data traffic using various different data access devices such as each computer terminal or a web phone connected thereto.

Data traffic sent through these different access devices enters an integrated access devices (IAD) 2 that manages different data access device modules multiplely, in order to reduce overall bandwidth waste. Network traffic is integrated and multiplexed.

Thereafter, the multiplexed data traffic passes through the first Attnchronous Transfer Mode (ATM) switch 3, is converted into an ATM scheme, and transferred to a CPE splitter (4).

In this case, the ATM (Astnchronous Transfer Mode) method will be described in more detail.

The ATM method is a method for transmitting data information and voice information connected through a plurality of terminals and telephones through a single dedicated line. When a terminal is transmitting data, a plurality of terminals may simultaneously transmit data. It is a control method to ensure that

This ATM method converts data information and transmission information into 53-byte cells consisting of 48-byte information and 5-byte headers, and divides it into blocks of a certain length or less when the circuit is empty. A method of transmitting such an ATM cell, and an apparatus for exchanging and connecting data information and transmission information in a cell unit is called an ATM switch.

The data information converted into an ATM cell through the first ATM switch 3 is reassembled by being connected to a CPE splitter 4 together with voice information transmitted by a user through a general telephone.

In this case, the splitter is a two-way communication, and the various electrical signals connected thereto are separated into electrical signals having different frequencies, or signals coming from several places are reassembled into one signal to transmit data traffic through DSL. And a device capable of transmitting voice and voice traffic at the same time, generally located in the subscriber service part to reassemble electrical signals transmitted from the subscriber to the central processing unit and separate electrical signals transmitted from the central processing unit to the subscriber. The splitter to be transmitted is referred to as a customer premises equipment (CPE) splitter (4), and the splitter located at the central service part with a corresponding role is called a central office (C) splitter (6) to distinguish each other.

Thus, data traffic and voice traffic applied to the CPE splitter 4 are combined in the CPE splitter 4 and delivered to the CO splitter 6 of the central service portion CO via a DSL, which is a regular telephone line.

Thereafter, the data traffic and voice information traffic delivered to the CO splitter 6 are separated by the CO splitter 6 so that the voice information traffic is connected to a public switched telephone network (PSTN) 16, which is a public switched telephone network. It is sent to the provider.

At this time, the data information traffic separated from the voice information traffic by the CO splitter 6 is connected to the Digital Subscriber Line Access Multiplexer (DSLAM) 8 to be multiplexed and connected to the third ATM switch 10. Explain in detail.

DSLAM has a role of centralizing and multiplexing DSL circuits, and centralizing such data information traffic in order to access data information traffic transmitted from multiple subscribers to an Asynchronous Transfer Mode (ATM) network or in the ATM network. Multiplexing device to deliver incoming ATM cell to each subscriber.

The general structure of the DSLAM has a form in which the lower module 18 and the upper module 20 are connected to a cell bus 50 made of an optical cable as shown in FIG. 2, and the lower module 18 is transferred from a subscriber. Comprising a plurality of subscriber matching unit 30 that receives the data traffic of the ATM cell type and the lower cell bus connection unit 40 to load the ATM cell data traffic received from the plurality of subscriber matching unit 30 on the cell bus 50. have.

In addition, the upper module 20 uses the ATM cell extracting unit 60 for extracting only the necessary ATM cells from the ATM data cells loaded on the cell bus 50 and the cells extracted by the ATM cell extracting unit 60 as serial data. A second ATM switch 70 for switching and a data processing module 80 for centralizing the data traffic converted from the second ATM switch 70 into serial data and transferring the same to the third ATM switch.

The serial data traffic concentrated by the DSLAM is then forwarded to the third ATM switch 10 of FIG. 1 to the Internet Service Provider 14 located at the network service provider through the ATM network 12. Delivered.

In addition, the return data sent from the Internet service provider to the subscriber of the network service provider is converted into serial data traffic through the third ATM switch, and entered into the data processing unit located in the upper module of the DSLAM, and multiplexed. It is converted into ATM cell data through and loaded on the cell bus through the ATM cell extracting unit.

After that, the ATM cell data loaded on the shell bus of the DSLAM is extracted from the upper module connection unit of the lower module and transferred to the subscriber through the subscriber matching unit.

When transmitting data from the general subscriber to the network service provider through the network environment using the general DSLAM through the above-described process, a plurality of ATM exchangers are required in three parts. Serial data that can be centralized by a plurality of first ATM exchangers that convert such data traffic into ATM cell data type when transmitting data information and data processing unit located in the upper module of DSLAM located in the central processing unit. A second ATM switch needed to convert to data and a third ATM switch needed to convert this centralized serial data back to ATM cell data for connection to an ATM network.

The reason why a large number of ATM switches are needed is that the type of data information that a general DSLAM can process is ATM. That is, in order to centralize data within the DSLAM, the ATM must be delivered to the DSLAM by ATM. In order to centralize cellular data, it is converted to serial data, and thus data information transmitted by the subscriber from the subscriber to the network service provider requires multiple ATM switches.

In addition, as described above, a method of transmitting data in which the first ATM exchanger is not installed at the subscriber side, that is, a method of transmitting the DSL data traffic through the DSL from the subscriber side to the central processing unit is also possible. In order for the DSL data to enter the DSLAM, a first ATM switch for converting the data information separated through the CO splitter into an ATM cell form must be located at a plurality of subscriber matching units of the DSLAM.

That is, in order to transfer voice information and data information from subscriber to network service provider using existing DSLAM, a plurality of ATM switches located in three parts are required.

When constructing a network environment through such a general DSLAM, data switching is required several times, and accordingly, a plurality of ATM switches are required, which increases the production cost and stability of data traffic delivery in constructing the network environment. It has the problem of inhibiting.

Accordingly, an object of the present invention is to provide a DSLAM capable of reducing the number of ATM exchangers.

1 is a diagram illustrating a data and voice information network environment including a DSLAM using a general ATM method.

2 is a block diagram illustrating an internal system of a DSLAM using a general ATM method.

3 illustrates a data and voice information network environment including an integrated DSLAM in accordance with the present invention.

4 is a block diagram illustrating an internal system of an integrated DSLAM according to the present invention.

<Name of main part of drawing>

110: voice traffic matching unit 115: subscriber voice traffic matching module

118: subscriber data traffic matching module 120: signal processing module using DSP

130: voice traffic IP address granter 140: data traffic matching unit

150: data traffic IP address granter

In order to achieve the above object, the present invention uses a plurality of voice traffic matching unit to which voice traffic delivered from a plurality of subscribers is connected, and a plurality of voice traffic matching units, respectively, and using a DSP for compressing the voice traffic. A subscriber voice traffic matching module having a signal processing module and an IP address assigning unit connected to the signal modules using the plurality of DSPs and assigning unique IP addresses to the compressed voice traffic and transmitting them to the ATM switch; A plurality of data traffic matching units to which data traffic delivered from a plurality of subscribers is connected, and an IP address granting unit connected to the plurality of data traffic matching units to give a unique IP address to the data traffic and transmit it to the ATM switch. It provides a DSL network environment including a subscriber data traffic matching module.

In addition, the present invention comprises the steps of receiving the voice traffic of the subscriber transmitted from the landline; Compressing the voice traffic; Assigning a unique IP address to the compressed voice traffic; The present invention provides a multiplexing method of voice traffic in a DS including transmitting the voice traffic given the IP address to an ATM switch.

In particular, receiving the data traffic of the subscriber transmitted from the terminal; Assigning a unique IP address to the data traffic; It provides a multiplexing method of data traffic in the DS including transmitting the data traffic given the IP address to the ATM switch.

Transmission process of data information and voice information using DSL including integrated DSLAM according to the present invention is connected to the same device in the form of point-to-multipoint as shown in FIG. It is divided into the Customer Premises Equipment (CPE) section, the Central Office (CO) section, and the Network Service Provider (NSP) section.

In the DSL network environment including the DSLAM according to the present invention, a process in which data traffic through the terminal and voice traffic through the telephone are transmitted from the subscriber service part to the network service provider will be described first. Subscribers, who are individuals or businesses, send data information using a variety of different data access devices, such as each computer terminal or a web phone connected to it.

Data information transmitted through these different access devices is integrated and multiplexed by the IAD (Integrated Access Devices) 2 which manages multiple modules of different data access devices in order to reduce overall bandwidth waste.

After that, the multiplexed data information is transferred to a customer premise equipment splitter (4). At this time, the user is connected to the CPE splitter (4) and reassembled together with the voice information transmitted through a general telephone. It is delivered to the CO splitter 6 of the service part.

Then, the data traffic and voice information traffic delivered to the CO splitter 6 are separated by the CO splitter 6 and connected to the integrated DSLAM 108 according to the present invention, respectively, centralized and connected to the ATM switch 10. Then, it is transmitted through the ATM network 12 to the Internet service provider 14 and the public switched telephone network 16 respectively located in the network service provider.

In this case, the integrated DSLAM according to the present invention for centralizing or multiplexing both the voice information data and the data information traffic in the process of transmitting the data traffic and the voice information traffic from the subscriber to the network service provider through the above-described process will be described in detail.

Integrated DSLAM according to the present invention is composed of two subscriber matching module as shown in FIG.

The two subscriber matching modules are divided into a subscriber voice traffic matching module 115 and a subscriber data traffic matching module 118. The subscriber voice traffic matching module 115 is a plurality of subscriber voice traffic matching devices connected to each subscriber. A unit 110, a signal processing unit 120 using a plurality of digital signal processing (DSP) connected to the subscriber voice traffic matching unit 110, and one voice traffic IP address granter 130, respectively.

In addition, the subscriber data traffic matching module 118 is composed of a plurality of subscriber data traffic matching unit 140 and data traffic IP address granter 150 connected with a plurality of subscribers.

In the integrated DSLAM having the above configuration, the voice traffic and the data traffic separated from the CO splitter will be described below. First, the voice traffic is the subscriber voice traffic matching unit of the subscriber voice traffic matching module 115 described above. And the traffic is compressed by a signal processing unit 120 using a DSP which serves to compress traffic and have an address therein, in the form of a PC1 transmission circuit having a transmission rate of 2.048 Mbps. The traffic enters the IP address providing unit 130.

Thereafter, the voice traffic IP address assigning unit 130 receives an IP address and enters an ATM switch. In this case, the IP to which the voice traffic is granted is applied to the ATM switch through a network using a general LAN network. The IP address destined for the IP address is used when the voice traffic is connected to an ATM exchanger and needs to adapt different classes of applications to the ATM layer to support various kinds of services with different traffic characteristics and system requirements. Among the AALs, the AAL2 layer is supported, which supports time-sensitive connection-oriented services such as voice.

In addition, the data traffic separated by the CO splitter is delivered to the subscriber data traffic matching unit 140 of the subscriber data traffic matching module 118 of the integrated DSLAM according to the present invention and enters the data traffic IP address granting unit 150. In this case, data traffic having an IP address through a general network address translation (NAT) method is transmitted to an ATM using a general LAN network. Adaptation layer will be supported.

By using the IP method according to the present invention, it is possible to reliably transmit and receive voice information and data information, and unlike the general DSLAM, the IP method can be used to reduce the number of ATM switches compared to a general network environment, thereby reducing costs. It has more effect.

Claims (3)

A) a plurality of voice traffic matching units to which voice traffic delivered from a plurality of subscribers is connected, B) a signal processing module connected to each of the plurality of voice traffic matching units and compressing the voice traffic, and C) A subscriber voice traffic matching module having an IP address assigning unit connected to a signal module using the plurality of DSPs and assigning a unique IP address to a compressed voice traffic and transmitting the unique IP address to an ATM switch; A) a plurality of data traffic matching units to which data traffic delivered from a plurality of subscribers is connected, and B) connected to the plurality of data traffic matching units to give a unique IP address to the data traffic and transmit it to the ATM switch. Subscriber Data Traffic Matching Module with IP Address Assignment DSL network environment including the DS Receiving a voice traffic of a subscriber transmitted from a landline telephone; Compressing the voice traffic; Assigning a unique IP address to the compressed voice traffic; Transmitting the voice traffic given the IP address to an ATM switch. Multiplexing method of speech traffic in DS Receiving a data traffic of a subscriber transmitted from the terminal; Assigning a unique IP address to the data traffic; Transmitting the data traffic given the IP address to an ATM switch; Multiplexing method of data traffic in DS