KR20010003793A - Digital Subscriber Line Modem for Universal Serial Bus - Google Patents

Abstract

The present invention relates to a universal serial bus (USB) digital subscriber line (DSL) modem. In the related art, digital subscriber line (DSL) modems use a DSL modem in a home PC because they provide an Ethernet or ATM-25 interface. The problem was that a separate Ethernet network interface card or ATM-25 network interface was required. The present invention provides a general-purpose serial bus interface that makes it possible to easily use a digital subscriber line (DSL) modem even for home PC users who do not have an Ethernet network interface card or an ATM-25 network interface card with an existing Ethernet interface. A universal serial bus built into a home PC enables high-speed ATM service using a telephone line, and the bridge function enables two independent networks separated from each other to be combined into one network.

Description

Digital Subscriber Line Modem for Universal Serial Bus

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a Universal Serial Bus (USB) Digital Subscriber Line (DSL) modem, and uses a high speed ATM (Asynchronous Transfer Mode) using a telephone line through a universal serial bus built in a general home PC. The present invention relates to a general-purpose serial bus digital subscriber line modem that enables a service and enables two independent networks separated from each other to be connected to one network by using a bridge function.

4 is a diagram illustrating a conventional general digital subscriber line network configuration diagram, a digital subscriber line access multiplexer (DSLAM) through the Ethernet hub and each ATM DSL modem from a personal computer (PC), the Internet It shows the configuration connected to ATM switch through.

However, in the related art, since DSL modems provide Ethernet or ATM-25Mbps interfaces, a separate Ethernet network interface card or ATM-25Mbps network interface is required to use a DSL modem in a home PC.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a universal serial bus interface with an existing Ethernet interface so that home PC users without an Ethernet network interface card or an ATM-25 network interface card can easily be used. It enables the use of digital subscriber line (DSL) modems to enable high-speed ATM service over telephone lines through a universal serial bus (USB) built into a home PC. The present invention provides a universal serial bus (USB) digital subscriber line (DSL) modem that allows two networks to be linked to one network.

1 is a network diagram of the present invention,

2 is a hardware configuration diagram of the present invention;

3 is a protocol diagram of the present invention;

Figure 4 is a conventional general digital subscriber line network configuration diagram.

(Explanation of symbols for the main parts of the drawing)

One ; Ethernet access block 2; Serial connection block

3; Microprocessor block

4 ; AAL-5 SAR block 5; EPLD Block

6; Flash memory block 7; DRAM block

8 ; EEPROM block 9; UTOPIA interface

10; ADD / DATA interface 11; Power supply block

12; Faceplate block 13; DSP / Framer Block

14; Local memory block 15; Analog front-end block

100; Hardware 200; Device driver block

300; Protocol block 400; API block

500; Application block

In order to achieve the above object, the Universal Serial Bus (USB) Digital Subscriber Line (DSL) modem of the present invention can be easily digitally subscribed to home PC users without an Ethernet network interface card or ATM-25 network interface card together with the existing Ethernet interface. Provides a universal serial bus interface that allows the use of a charitable line (DSL) modem.

Hereinafter, the present invention will be described with reference to the illustrated drawings.

The universal serial bus digital subscriber line modem proposed in the present invention is connected to an ATM network using a telephone line as shown in FIG. The subscriber-side interface provides Ethernet and Universal Serial Bus (USB) simultaneously and can be selected according to the user's PC environment.

2 is a hardware configuration diagram of a general-purpose serial bus digital subscriber line modem of the present invention, in which the lower part divided by a dotted line in the drawing is a conventional main board (MB) and the upper part is a DSL daughter board (DB) according to the present invention. to be. The function of each block is as follows.

First, the Ethernet access block (1) on the motherboard (MB) is connected to the LAN equipment supporting the Institute of Electrical and Electronics Engeering (IEEE) 802.3 (10Base-T) Ethernet standard. In general, an Ethernet Hub or an Ethernet Switch is connected.

The serial connection block 2 is connected to equipment supporting the universal serial bus interface. Typically, a home PC or a universal serial bus hub is connected.

The Ethernet connection block 1 and the serial connection block 2 are connected to the microprocessor block 3. The microprocessor block 3 is connected to the daughter board DB through a UTOPIA interface (9; Universal Test & Operation Physical Interface for ATM Interface) and an ADD / DATA interface (10), and the ADD / DATA interface (10). For example, EPLD blocks (5; Erasable Programmable Logic Device Block), flash memory blocks (6; Flash Memory Block), DRAM blocks (7; Dynamic Random Access Memory Block), EEPROM blocks (8; Electric Erasable Programmable Read Only Memory Block) The connection is connected.

The EPLD block 5 receives a signal required by the microprocessor block 3 and generates a control signal required for the device. The flash memory block 6 includes a basic program and a device driver for operating the device. Protocols are built in.

The DRAM block 7 is a block for storing temporary data to be used while the equipment is operating. The EEPROM memory block 8 allows data to be stored even when the power of the equipment is turned off.

Meanwhile, the microprocessor block 3 performs a function of a basic microprocessor. The microprocessor block 3 reads the software of the flash memory block 6 to perform a function of a modem or to store temporary data generated during operation of the modem. Read / store from the Dynamic Random Access Memory Block, and read and store the basic configuration values of the modem from the EEPROM block (8; Electric Erasable Programmable Read Only Memory Block).

The AAL-5 SAR block (4; ATM Adaptation Layer-5 Segmentation and Reassembly Block) located in the microprocessor block 3 transfers data input through the Ethernet access block 1 or the serial access block 2 to the ATM cell. Convert The converted ATM cell is transferred to the DSL Daughter Board (DB) through the UTOPIA interface (9; Universal Test & Operation Physical Interface for ATM Interface) and performs the reverse function.

Unexplained symbol "11" is a power supply block to provide 5V, 3.3V, + 12V, -12V, etc. required for the equipment, "12" is a front panel block of power (ON, OFF), daughter board Displays the type of equipment (T1, E1, 25 Mbps, 155 Mbps), the status of the microprocessor block 3 (RUN, FAIL), and the presence or absence of input data (Ethernet, T1, E1, 25 Mbps, 155 Mbps).

Next, as mentioned above, the DSL daughter board DB connected through the UTOPIA interface 9 and the ADD / DATA interface 10 from the main board MB is connected to the DSP / framer block 13 (Digital Siginal Processor). A framer block, a local memory block 14, an analog frontend block 15, and a line driver block 16.

The DSP / framer block 13 modulates data input through the UTOPIA interface 9 to DSL standard or performs the reverse function.

The local memory block 14 stores temporary data to be used while the DSP / framer block 13 is operating.

The analog front end block 15 performs analog to digital (A / D), digital to analog (D / A), and filter functions.

The line driver block 16 performs impedance matching and separation functions for the telephone line.

3 is a diagram illustrating a protocol configuration of the present invention, in which each column is sequentially arranged from the bottom to the hardware (100), the device driver block (200), the protocol block 300, and the application program interface (API) block ( 400, application block 500.

The hardware 100 is further provided with an ADSL (103;) in addition to the serial (serial) 101 and Ethernet 102, which are existing configurations.

The device driver block 200 may be configured as an AAL-5 SAR 203 for the ADSL 103 in addition to the DISI 201 for the serial 101 hardware and the LAN 202 to which the Ethernet 102 is connected. ) Is provided.

The protocol block 300 includes TCP / IP (301; Transmission Control Protocol / Internet Protocol), which defines transmission control and addressing scheme of the Ethernet network, and a procedure for ATM signaling. UNI (305; User Network Interface) that satisfies 3.0 / 3.1 and 4.0 standard, and converts serial data and transmits it to TCP / IP (301), or vice versa, and controls IP address system for serial subscriber. Point to Point Protocol (PPP) 306, and messages for ATM signaling to the AAL-5 SAR 203, or vice versa, perform flow control and collision control on this data, and also errors in the protocol. SSCF / SSCOP (304; Service Specific Coordination Function / Service Specific Connection Oriented Protocol) that detects, recovers, and establishes, resynchronizes, and releases the connection with the SSCF / SSCOP protocol block of the other party connected to the network. And, such a virtual LAN is the conventional configuration;; (Internet Protocol over ATM 303) is further configured (302 Virtual LAN) and IPOA.

The virtual LAN 302 allows a TCP / IP 301 frame to be effectively associated with an IPOA 303 protocol block via a virtual LAN driver.

The IPOA 303 transmits a TCP / IP 301 frame to the AAL-5 SAR 203 or performs the reverse function, and performs traffic control and connection control for such a frame. . In addition, it interoperates with the SSCF / SSCOP 304 and the UNI 305 to perform ATM ARP (Address Resolution Protocol) and Inverse ATM ARP functions, and the IPOA protocol block and PVC and SVC (Switched) of the other party connected to the network. Virtual Circuit) Connection is set / released.

In another general configuration, the API block 400 includes a socket API 401 connected to the TCP / IP 301 and a signaling API 402 connected to the UNI 305.

The application block 500 connected to the API block 400 may include a bridge 501, a security / firewall 502, an SNMP 503, a telnet connected to the socket API 401. / FTP (504; Telnet / FTP), RIP / OSPF (505; Routing Information Protocol / Open Shortest Path First), and PVC / SVC signaling (506) connected to the signaling API (402), QOS / traffic control ( 507; QOS / Traffic Control), ILMI / OAM-F5 (508; Integrated Local Management Interface / Operation and Management-F5).

The bridge 501 is an application for tying two independent Ethernet networks into one Ethernet network, the security / firewall 502 is an application for protecting the network from unauthorized users, and the SNMP 503 is a remote application. Remote network management application for managing routers.

Also, telnet / FTP 504 is a remote control application for setting up and monitoring a router remotely, and RIP / OSPF 505 is an application program for managing routing information of an Ethernet network. PVC / SVC signaling 506 is an ATM signaling application, and QOS / traffic control 507 is a QOS and flow control management application such as Available Bit Rate (ABR), Variable Bit Rate (VBR), and Usable Bit Rate (UBR). Program, ILMI / OAM-F5 508, is an ATM layer management application.

Transmitting and receiving procedure of a universal serial bus (USB) digital subscriber line (DSL) modem proposed in the present invention is as follows.

Ethernet packets received via the Ethernet 102 connection are forwarded to the TCP / IP protocol block via the LAN device driver block 202, and the serial data received via the serial 101 connection is sent to the DISI 201 device driver and the PPP. 306 is passed through the protocol block to the TCP / IP 301 protocol block.

The forwarded packet is passed to the virtual LAN 302 protocol block or the IPOA 303 protocol block via the socket API 401 and the corresponding application program block 500 and again through the TCP / IP 301 protocol block. The transmitted TCP / IP packet is converted into an ATM cell through the IPOA 303 protocol block and the AAL-5 SAR 203 device driver block, and the converted ATM cell is converted into a DSL daughter board through the UTOPIA interface 9 in FIG. Is passed to (DB). The transferred ATM cell is modulated in the DSP / player block 13, D / A converted in the analog front end block 15, and transmitted via the line driver block 16. The DSL modulated signal received from the other party is converted into an ATM cell through A / D conversion and demodulation in the reverse order.

The present invention as described above is able to provide a high-speed ATM service (about 1Mbps) using a universal serial bus (USB) built in a home PC without a separate device. Accordingly, the present invention does not require a separate device other than a home PC, and can use a dedicated line service using a bridge function in an environment in which a dedicated line is not installed. In addition, by using the bridge function, two independent networks separated from each other can be linked to one network.

Such the present invention can be used to configure an independent network without a separate DSLAM because it selects and uses the functions of the CO (Central Office) equipment and the subscriber (CP; Customer Premises) equipment.

Claims (3)

A microprocessor block (3) to which an Ethernet access block (1) and a serial access block (2) are connected, and an EPLD block (5) for receiving the signals required by the microprocessor block (3) and generating control signals necessary for the equipment. Flash memory block 6 with built-in basic program, device driver, and protocol for operation of device, DRAM block 7 storing temporary data to be used while the device is operating, and should be stored even when the power is turned off. EEPROM memory block (8) for storing data, AAL-5 SAR block (4) for converting Ethernet data input through Ethernet access block (1) into ATM cell, the microprocessor block (3) and daughter board ( DB) UTOPIA interface (9) and ADD / DATA interface (10) connected between the power supply block 11 for providing the power required for the equipment and the front panel block 12 for displaying the status of the equipment According to which a motherboard (MB), which also, DSP / MS that connects and connects through the UTOPIA interface 9 and the ADD / DATA interface 10 from the main board MB, and modulates the data input through the UTOPIA interface 9 to the DSL standard or performs the reverse function. A framer block 13, a local memory block 14 storing temporary data to be used while the DSP / framer block 13 operates, and an analog front end block 15 performing A / D, D / A and filter functions. DSL daughter board (DB) having a line driver block 16 for performing impedance matching and disconnection function for the telephone line; Universal Serial Bus (USB) Digital Subscriber Line (DSL) modem further comprising a. Hardware (100) consisting of serial (101) and Ethernet (102); A device driver block (200) comprising a DISI (201) connected to the serial (101) of the hardware (100) and a LAN (202) to which an Ethernet (102) is connected; It is connected to the device driver block 200 and transmits the TCP / IP 301 for defining the transmission control and the address scheme of the Ethernet network, the ATM signaling message to the AAL-5 SAR 203, and performs the reverse function. SSCF / SSCOP 304 for performing flow control and collision control on data, detecting and recovering errors in protocols, and establishing, resynchronizing, and releasing connections with SSCF / SSCOP protocol blocks of peers connected to the network; UNI 305, which defines signaling procedures and satisfies the ATM Forum UNI 3.0 / 3.1 and 4.0 specifications, converts serial data and delivers it to the TCP / IP 301 or performs the reverse function. A protocol block 300 composed of a PPP 306 that is in charge of controlling the IP address system for the network; An API block 400 having a socket API 401 connected to the TCP / IP 301 of the protocol block 300 and a signaling API 402 connected to the UNI 305; The bridge 501 is connected to the API block 400, connected to the socket API 401, for bridging two independent Ethernet networks into one Ethernet network, and security for protecting the network from unauthorized users. Firewall (502), Remote Network Management SNMP (503) for remotely managing routers, Remote Control Telnet / FTP (504) for configuring and monitoring routers remotely, RIP / OSPF (for managing routing information of Ethernet networks) 505, PVC / SVC signaling 506 connected to the signaling API 402 and provided as an ATM signaling application, Available Bit Rate (ABR), Variable Bit Rate (VBR), Usable Bit Rate (UBR), etc. An QOS / traffic control 507 for managing QOS and flow control of the application block 500 and an ILMI / OAM-F5 508 for ATM layer management; In having a protocol composed of The hardware 100 includes an ADSL 103, the device driver block 200 includes an AAL-5 SAR 203 connected to the ADSL 103, and the protocol block 300 includes a TCP / IP 301. ) Delivers the frame to the AAL-5 SAR 203 or vice versa, and performs ATM Address Resolution Protocol (ARP) and Inverse ATM ARP functions by interworking with the SSCF / SSCOP 304 and the UNI 305. IPOA 303 for establishing and releasing the IPOA protocol block of the other party connected to the network, PVC and SVC connection, and TCP / IP 301 connected to the TCP / IP 301 and through a virtual LAN driver. A Universal Serial Bus (USB) Digital Subscriber Line (DSL) modem, wherein the Virtual LAN 302 has an additionally configured protocol that allows frames to be effectively associated with the IPOA 303. Ethernet packets received via the Ethernet 102 connection are forwarded to the TCP / IP protocol block via the LAN device driver block 202, and the serial data received via the serial 101 connection is sent to the DISI 201 device driver and the PPP. 306, passing it through the protocol block to the TCP / IP 301 protocol block; The packet transmitted to the TCP / IP 301 protocol block passes through the socket API 401 and the corresponding application program block 500, and then through the TCP / IP 301 protocol block to the virtual LAN 302 protocol block or IPOA ( 303) passing to the protocol block; Converting a TCP / IP packet transmitted to the virtual LAN 302 protocol block or an IPOA 303 protocol block into an ATM cell while passing through an IPOA 303 protocol block and an AAL-5 SAR 203 device driver block; The ATM cell converted in this step is transferred to the DSL daughter board (DB) via the UTOPIA interface 9, and the transferred ATM cell is modulated in the DSP / player block 13 and D in the analog front end block 15. / A converted and transmitted via the line driver block 16; And a DSL modulated signal received from the other party is converted into an ATM cell through A / D conversion and demodulation in the reverse order of the above steps.