KR200304385Y1 - Home network adopting SMS / CD system in DS-based home telephone network - Google Patents

Abstract

The present invention relates to a Digital Subscriber Line (DSL), and more particularly, to a home network employing a CSMA / CD scheme to use multiple terminals using a home telephone line. The present invention is a home network system for receiving digital subscriber line (DSL) data service, is equipped with a network interface card (DSL NIC) for receiving DSL data service, connected to an external telephone line, and adopts a CSMA / CD scheme. One or more servers mounted with a network interface card (NIC) including a transceiver and connected to an internal telephone line; And a plurality of information terminals mounted on a network interface card (NIC) including the same transceiver as the server and connected to the server and an internal telephone line. The transceiver performs Asynchronous Transfer Mode (ATM) based transmission; ATM segment and reassembly for segmenting and reassembling information data, ATM physical layer for mixing and demixing ATM data flow, and line coding for line coding / line decoding for transmission to telephone lines part; And a collision detection unit that monitors the state of the telephone line and controls the timing of sending the line coding unit.

Description

Home network adopting SMS / CD system in DS-based home telephone network

The present invention relates to a digital subscriber line (hereinafter referred to as DSL), and more particularly to a home network employing a CSMA / CD scheme to use multiple terminals using a home telephone line.

One of the approaches to increase information traffic and respond to video, data and multimedia services is to apply advanced modulation technology to Twist Pair Line (TP line) based transmission, and the other is TP based subscriber. It turns the network into an optical fiber. The former TP-based bandwidth extension method has different transmission distances and allocated bandwidths depending on various modulation methods. high-speed Digital Subscriber Line).

On the other hand, due to the spread of low-cost personal computer (PC), homes or small companies that own one or more PCs, it is necessary to configure a network between terminals. In particular, when a home network is formed using a telephone network, it is possible to configure a terminal using a plurality of telephones and a single DSL.

However, when networking multiple information terminals using multiple phones and DSLs, a new data network for the information terminals must be constructed. 1 and 2 illustrate a home network type configured using such a DSL.

In Fig. 1, a telephone line 2 connected to a telephone station enters a premises through a telephone network interface device (TNID) 10, and a plurality of telephones 11-1, 11 connected to the premises telephone line 2; -2) is connected. In order to configure several information terminals using a telephone network, a plurality of information terminals such as an information terminal 15-1, an information terminal 15-2, and an information terminal 15-3 are used for data transmission. , 4-wire wire) and a hub 16 located at the center thereof. One side of the hub 16 is provided with a server 100 that manages multiple information terminals and serves as a gateway to the telephone network, and the other side comprises a plurality of information terminals 15-2, 15- constituting the data network 110. 3) is provided. The server 100 mounts a DSL Network Interface Card (DSL NIC) 12 in a slot of the information terminal 15-1, and the card 12 and the telephone line 2 are connected. In addition, the server 100 mounts a network interface card (NIC) 14-1 in another slot, and the card 14-1 is connected to the hub 16. FIG. The plurality of information terminals 15-2 and 15-3 each mount NIC cards 14-2 and 14-3, and the cards are connected to the hub 16, respectively.

In FIG. 2, a plurality of telephones 21-1 and 21-2 are connected to the telephone line 6 brought into the home via the TNID 20 similarly to the configuration in FIG. 1. The data network 210 is connected to a plurality of information terminals such as the information terminal 24-1 and the information terminal 24-2 via a hub 25 by a data transmission cable 8. The telephone network and data network are connected via an interface device 200 such as, for example, a DSL single router or bridge. The interface device 200 is connected to the telephone line 6 by mounting the DSL NIC 22 in the slot and is connected to the hub 25 by mounting the NIC 23-1 in the other slot.

1 and 2, in order to receive a data service using a DSL together with an existing telephone service, a splitless DSL may be directly connected to a home telephone network in a plug and play manner. At this time, DSL is composed of a central DSL terminal unit (ATU-C) connected to an operator side and an ADSL terminal unit (ATU-R) of a subscriber side connected to a line operator. Because it operates in a point-to-point fashion, only one ATU-R can be connected.

Therefore, only one terminal can be connected in the home telephone network, and a separate line configuration is required in order to configure several information terminals using a DSL as a network, and thus there is a problem in that an information distribution equipment such as a hub is required.

Accordingly, the present invention has been devised to solve the above problems, and employs a transceiver capable of Carrier Sense Multiple Access / Collision Detection (CSMA / CD) for the network card of the information terminal. The present invention provides a home network employing a CSMA / CD scheme in a DSL-based home telephone network that can use a plurality of information terminals in a home without a line configuration.

The present invention for achieving the above object is, in a home network system for receiving a digital subscriber line (DSL) data service, a network interface card (DSL NIC) for receiving the DSL data service is mounted and connected to an external telephone line At least one server mounted with a network interface card (NIC) including a transceiver employing a CSMA / CD scheme and connected to an internal telephone line; And a plurality of information terminals mounted on a network interface card (NIC) including the same transceiver as the server and connected to the server and an internal telephone line.

1 is an embodiment of a conventional DSL-based home network configuration,

2 is another embodiment of a conventional DSL-based home network configuration,

3 is an embodiment of a home network configuration employing the CSMA / CD method according to the present invention,

4 is a detailed block diagram of the server of FIG. 3;

5 is a detailed block diagram of the transceiver of FIG. 4.

** Explanation of symbols for the main parts of the drawing **

30: Telephone network interface device (TNID)

31-1,31-2: Phone 300: Server

310,320: Node 32: DSL Network Interface Card (NIC)

33-1,33-2,33-3: Transceiver 34-1,34-2,34-3: Information terminal

40: ATM Segmentation and Reassembly

41: ATM Physical Layer Protocol (PHY)

42: line coding section

43: collision detection unit

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention.

3 is an embodiment of a home network configuration employing the CSMA / CD method according to the present invention. The access method of the home network of the present invention conforms to the CSMA / CD specification for sharing a single transmission path among multiple users (terminals). The telephone line 35-1 connected to the telephone station enters the home via the TNID 30, and a plurality of telephones 31-1 and 31-2 connected to the home telephone line 35-1 are connected. In the home network for the DSL data service, a server 300 for network management and a plurality of nodes such as a first node 310 and a second node 320 are connected to a telephone line 35-2 (eg, a two-wire system). Wire).

The server 300 stores a shared database and various programs of each individual node, and is an information terminal 34-1 that serves as an information gateway between the network and the outside. The server 300 mounts a DSL NIC 32 connected to a Plain Old Telephone Service (POTS) line 35-1. The server 300 also mounts a network interface card (NIC) including a transceiver 33-1 designed to transmit electrical signals by telephone lines 35-2, such as two-wire lines. The transceiver 33-1 employs a CSMA / CD scheme to access the telephone line 35-2, which is a shared medium.

The first node 310 and the second node 320 each have an information terminal 34-2 having a transceiver 33-2 and a transceiver 33-3 having the same transmission characteristics as the transceiver 33-1. ) And an information terminal 34-3. As such, the information terminals receiving the DSL service form a network through the telephone line 35-2 to exchange data with each other.

According to the present invention, by applying a transceiver suitable for a 2-wire line capable of CSMA / CD to a network card, a network can be configured without a separate line configuration (that is, without a separate hub).

The present invention has a structure similar to 10BASE-2 (Thin Net), which does not require a hub, among the existing Ethernet structures. For reference, 10BASE-2 uses CSMA / CD as a media access method for coaxial cable, and baseband differential Manchester coding as line coding.

4 is a detailed block diagram of the server of FIG. 3, and FIG. 5 is a detailed block diagram of the transceiver of FIG.

Referring to FIG. 4, the information terminal 34-1 communicates transmission / reception information with the lower layer DSL NIC 32 and the transceiver 33-1 as the highest application layer. The transceiver 33-1 employs a well-known ATM (Asynchronous Transfer Mode) communication method that can handle various services together.

The transceiver 33-1 includes an ATM segmentation and reassembly (40) for segmenting and reassembling application service information, an ATM physical layer (41) for mixing / demixing ATM data information, and a two-wire telephone. A line coding unit 42 which encodes / decodes to be transmitted to a line, and a collision detection unit 43 which detects whether data is occupied by a two-wire telephone line.

Referring to FIG. 5, the ATM SAR unit 40 divides service information of the information terminal 34-1, which is an application layer, for transmission, forms a protocol data unit (PDU), and sends it to the ATM PHY unit 41. Through the reverse process, the PDU is reassembled, restored to the received information, and provided to the information terminal 34-1.

The ATM PHY unit 41 receives the PDU in the transmission direction, stores the PDU in a first in first out (411) FIFO, outputs it to the mixing unit 412 on a first-in first-out basis, and the mixing unit 412 mixes the ATM data flow. (scrambling) In addition, after descrambling the ATM data flow through the demixing unit 413 in the receiving direction, the ATM data is output to the ATM SAR unit 40 on a first-in first-out basis through the FIFO 414.

The line coding unit 42 codes the data mixed in the transmission direction through the line coding unit 421 and transmits the coded signal on the two-wire telephone line 35-2 through the line driver 422. . In addition, the coded signal on the two-wire telephone line in the receiving direction is received through the line driver 423, decoded by the line decoding unit 424, and then transferred to the demixing unit 413.

The collision detection unit 43 monitors the state of the two-wire telephone line 35-2, and detects whether the line 35-2 is in use or occupied by another information terminal. If there is data in the line 35-2, the collision detection unit 43 controls the line driver 422 and waits for a predetermined time before starting transmission (CSMA / CD method). In addition, when two or more information terminals are simultaneously transmitted to the idle line, a collision occurs, so the collision detection unit of each information terminal must have a random random delay time. If a collision is detected, it can be retransmitted after a predetermined delay.

In the transmission process of the transceiver according to the present invention, transmission information data inputted from the information terminal 43-1 is divided into PDUs in the ATM SAR 40, and then outputted in order through the FIFO 411 to be mixed with the mixing unit 412. And NRZ line coding in the line coding unit 421. The line coded data is output to the line 35-2 via the line driver 422 when the line is empty under the control of the collision detector 43. The receiving process of the transceiver is performed in the inverse of the transmitting process, and the data input from the line 35-2 is passed through the line driver 423, the line decoding unit 424, the inverse mixing unit 413, and the FIFO 414. The ATM SAR 40 reassembles the received information into the information terminal 34-1.

In a more preferred embodiment of the present invention, since it is used only in the home using a two-wire telephone line, a coding scheme for effectively operating at a short distance, for example, a baseband non-return to zero (NRZ) line coding scheme should be used. The line coder 421 codes the input bitstream by the 4b / 5b group coding method using the NRZ method. In 4b / 5b encoding, four bits are represented by grouping 5baud, which reduces the bandwidth burden compared to Manchester coding.

As described above, the present invention configures a network by connecting a plurality of information terminals with two-wire lines around a server having a CSMA / CD transceiver that can be transmitted to a DSL NIC and a two-wire telephone line in a home telephone network. Therefore, the DSL service home network using the home telephone network can be configured without a separate line. In addition, there is no need for a distribution device such as a hub, and plug and play is a simple advantage in configuring and installing a home network.

Claims (3)

In a home network system for receiving digital subscriber line (DSL) data services, One that is connected to an external telephone line by mounting a network interface card (DSL NIC) for receiving DSL data service, and is connected to an internal telephone line by mounting a network interface card (NIC) including a transceiver employing the CSMA / CD method. More servers; And Home using the CSMA / CD system in a DSL-based domestic telephone network, comprising a plurality of information terminals connected to the server and an internal telephone line by mounting a network interface card (NIC) including the same transceiver as the server. network. 2. The apparatus of claim 1, wherein: the transceiver performs Asynchronous Transfer Mode (ATM) based transmission; An ATM segment and reassembly (SAR) unit for dividing the transmission information data inputted from the information terminal into a predetermined PDU (Protocol Data Unit) and reassembling the PDU provided in the reception direction into the reception information data; ATM PHY (Physical) which mixes ATM data flows by outputting PDUs provided by the ATM SAR unit on a first-in first-out basis (FIFO), and demixes ATM data flows provided in a receiving direction and then provides the ATM SAR unit on a first-in-first-out basis. layer); A line coding unit which line-codes the mixed data provided from the ATM PHY unit and transmits it on the telephone line, and decodes the line coded signal on the telephone line in a receiving direction to provide the ATM PHY unit; And And a CSMA / CD scheme in a DSL-based domestic telephone network, comprising a collision detection unit that monitors the telephone line state and controls the timing of sending the line coding unit. 3. The CSMA / CD scheme of a DSL-based domestic telephone network according to claim 2, wherein the line coding unit employs a 4b / 5b group coding method of baseband non-return to zero (NRZ) line coding. Home network.