KR20010111947A - Digital subscriber line access multiplexer - Google Patents

Abstract

The present invention relates to a digital subscriber line connection multiplexer including a network connection board for matching with a data communication network, a control board for control and management, and a plurality of function modules detachable from a backplane, wherein the function module is connected to a position. Mounted on the control board to automatically detect when mounted without; A voice over IP board configured to extract a telephone signal from an analog signal input through the data communication network to provide a plurality of telephone services to a single telephone line on the backplane; A digital subscriber line multiplexer for digitizing the extracted telephone signal into an IP packet, converting the extracted telephone signal into an ATM cell, and transmitting the same to an asynchronous digital subscriber line frame. By providing a telephone service to improve the quality of the DSLAM, and can be plugged into the slot of the DSLAM slot without any distinction, there is an advantage that can improve the convenience and safety compared to the fixed system.

Description

Digital subscriber line connection multiplexer {DIGITAL SUBSCRIBER LINE ACCESS MULTIPLEXER}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital subscriber line connection multiplexer, and more particularly, to a digital subscriber line connection multiplexer which is installed in an exchange office and is capable of attaching and detaching a board regardless of the position of the backplane and supporting voice over IP. will be.

In general, data communication is performed by using a modem to connect to a data communication network such as the Internet to exchange predetermined information using a predetermined protocol.

Recently, an asynchronous digital subscriber line system that can provide broadband data service at a speed of 8 Mbps or lower and 800 Kbps upward using an existing telephone line without installing a new subscriber line has been in the spotlight.

The asynchronous digital subscriber line system is provided with a digital subscriber line access multiplexer (hereinafter referred to as DSLAM), which will be described in detail.

1 is a block diagram showing the configuration of a conventional digital subscriber line connection multiplexer. One end of the DSLAM 10 is connected to a data communication network 20 such as an Internet service provider (ISP), and the other end is asynchronous digital. An Asynchronous Digital Subscriber Line (ADSL) modem 22 is connected, which is installed at the switching center.

In addition, the DSLAM 10 is directly connected to the data communication network 20 performs a network connection function of the network board 12, and a control board 14 for generating a predetermined control signal by a program stored therein and And a plurality of subscriber access boards 18 connected to each of the network access board and the control board and mounted on a backplane connected by one cell bus. The subscriber access board 18 is connected to the ADSL modem 22.

DSLAM 10 having such a configuration performs the following functions.

Data input from the subscriber board through the subscriber modem port is concentrated to the 155 Mbps optical port or 45 Mbps DS3 port of the uplink board to transfer data to the network side, and 155 Mbps optical port of the uplink board or 45 Mbps Distributes the downlink data input to the DS port of the subscriber board to the asynchronous communication modem port of the subscriber board, the control board performs the control and management functions for this.

However, since the conventional DSLAM as described above not only performs the multiplexing function of the ATM cell, but also does not match the communication protocols for the data path, the SDSL or HDSL does not provide a telephone service and provides only a data service. In the case of ADSL, it has a disadvantage of providing one analog telephone service and data service.

In addition, since the boards connected to the backplane are fixed in position, a problem arises when the boards are mounted in different positions, and there is a problem in that the configuration of the DSLAM needs to be changed when additional boards are mounted.

Therefore, there is a need to develop a DSLAM that provides data service and telephone service at the same time and recognizes and detects the board at any location.

The present invention is to solve the above-mentioned problems, and to meet the above needs, by implementing a voiceover IP module to provide a plurality of telephone services to one telephone line, the analog signal input to the dedicated line T1 or E1 It is an object of the present invention to provide a digital subscriber line connection multiplexer that extracts a telephone signal from the digital packet, converts it into an IP packet, converts it into ATM cell data, and transmits the same to an ADSL frame.

Another object of the present invention is to provide a digital subscriber line connection multiplexer to be installed in the slot without distinguishing the subscriber module, network connection module, voice-over IP module by providing a function that automatically detects each module detachable in the slot. will be.

1 is a block diagram showing the configuration of a conventional digital subscriber line connection multiplexer.

2 is a block diagram for explaining a modification of the digital subscriber line connection multiplexer according to the present invention;

3 is a block diagram showing the configuration of the voice over eyeboard shown in FIG.

4 is a block diagram illustrating conceptual functions of the microprocessor shown in FIG. 2;

5 is a block diagram showing the configuration of the asynchronous digital subscriber line board shown in FIG.

Figure 6 is a block diagram showing the configuration of a control board shown in FIG.

7 is a block diagram showing a network interface board of a digital subscriber line connection multiplexer according to the present invention;

<Explanation of symbols for main parts of drawing>

100: backplane 110: XDSL subscriber board

120: voice over IP board 130: network connection board

140: control management board

A feature of the present invention for achieving the above object is a digital subscriber line connection multiplexer comprising a network connection board for matching with a data communication network, a control board for control and management, and a plurality of functional modules detachable to the backplane. The control board includes a function for automatically detecting when the function module is mounted regardless of position; A voice over IP board configured to extract a telephone signal from an analog signal input through the data communication network to provide a plurality of telephone services to a single telephone line on the backplane; A digital subscriber line multiplexer for digitizing the extracted telephone signal into an IP cell, converting the extracted telephone signal into an ATM cell, and transmitting the same to an asynchronous digital subscriber line frame.

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

As shown in FIG. 2, the DSLAM 100 according to the present invention allows the module to be plugged regardless of the slot position, and provides a plurality of telephone services in one telephone line by embedding a voice over IP board.

That is, the backplane of the DSLAM XDSL subscriber board 110, voice over IP board 120, the network connection board 130, the control management board 140 can be plugged without distinction, it is not provided in the existing configuration Voice over IP board is installed.

In particular, as shown in FIG. 3, the voiceover IP board 120 includes a T1 / E1 transceiver 122 directly connected to T1 / E1, which is a data communication line, and a T1 / E1 framer 124 constituting an ATM frame. And a voice codec unit 126 for encoding or decoding a voice signal, a microprocessor 128 for performing a predetermined arithmetic function, and a cell bus interface device 129 for interfacing with a cell bus. .

Functional description of the microprocessor 128 is as follows.

FIG. 4 is a block diagram conceptually illustrating the microprocessor illustrated in FIG. 3. The microprocessor 128 includes an application layer including an address translation and analysis module, a network management module, and other applications, and H.323 and TCP / UDP. Network protocol module for IP, AAL-1, AAL-2, AAL-5, SAR, ATM, telephone signal processing module including CCS signal processing and CAS signal processing module, voice for interfacing voice packet It is configured to include a packet interface.

In addition, the ADSL subscriber board 110, as shown in Figure 5, one end is connected to the cell bus, the other end is connected to the telephone line to perform the multiplexing function of the input data. That is, the cell bus interface device 112 connected to the cell bus for interfacing with the cell bus, the microprocessor 114 for generating a predetermined control signal, and a phone line are respectively connected to each other to transmit and receive asynchronous communication data. And a plurality of XDSL transceivers 116 to perform functions. At this time, the cell bus interface device and the XDSL transceiver are connected by Utopia 2, and the microprocessor controls the cell bus interface device and the XDSL transceiver.

Meanwhile, as shown in FIG. 6, the control management board 140 is connected to CellBus and is connected to CellBus interface device 142 for CellBus interfacing, and an Ethernet card 146 connected to another external maintenance system by UTP cable. ), And a serial communication unit 148 connected with an external console and a serial communication cable.

In addition, the network interface board 130 is connected to the cell bus interface device 132 for interfacing with the cell bus, an optical cable or a coaxial cable, and a data communication unit 136 for data transmission and reception, and the cell bus interface device. And a microprocessor 134 for controlling each of the data communication units.

DSLAM according to the present invention having such a configuration not only further includes a voice over IP board, but also has a configuration to detach the various boards without slot position separation.

According to a preferred embodiment of the present embodiment disclosed as described above has the following advantages.

First, by providing a voice over IP board, there is an advantage that can improve the quality of DSLAM by providing a plurality of telephone services in one telephone line.

Second, by allowing the board to be plugged into the slot of the DSLAM without distinguishing the location, there is an advantage that the convenience and safety can be improved compared to the existing system having a fixed position.

Claims (4)

In the digital subscriber line connection multiplexer comprising a network connection board for matching with a data communication network, a control board for control and management, and a plurality of functional modules detachable to the backplane, The control board is equipped with a function to automatically detect when mounting the function module regardless of the position, And a voice over IP board configured to provide a plurality of telephone services to one telephone line by extracting telephone signals from the analog signals input through the data communication network on the backplane. And digitizing the extracted telephone signal into an IP packet, converting the extracted telephone signal into an ATM cell, and then transmitting the extracted telephone signal in an asynchronous digital subscriber line frame. The method of claim 1, The voice over IP board is connected to a data dedicated network, a transceiver for transmitting and receiving data, a framer for configuring the transmitted signal as a frame, a voice codec unit for encoding or decoding a voice, and a microprocessor for controlling the board. And a cell bus interface unit for interfacing with an external cell bus. The method of claim 1, The control board includes a cell bus interface device for interfacing with an external cell bus, a control board for emitting control signals for control and management, an ethernet card for connection with an external maintenance system, an external console, Digital subscriber line connection multiplexer comprising a serial communication device for connection of the. The method of claim 2, And the transceiver is connected to an external E1 line or T1 line.