CN100391218C - Long-distance network transmission architecture and related device thereof - Google Patents

Abstract

The invention is a long distance network transmission structure and relative device, which uses current CAT 5 transmission network to realize high speed and long distance network service; in the long-distance network transmission structure, a physical layer device (DSP PHY) with digital signal processing capability is used for receiving data signals on a long-distance network and then driving the data signals to a user end using a common physical device so as to transmit high-capacity and high-speed network data signals by using the network transmission line; the data signal transmitted by DSP PHY can exceed 300 meters, and the transmission speed can be increased to 100Mbps in both directions; the invention can reduce the cost of the operator and the user terminal device in the network transmission structure and the network transmission structure can be more easily constructed by using 2 pairs of CAT 5 network transmission lines as full duplex transmission and using the idle 2 pairs of transmission lines to support the power supply for providing the repeater.

Description

Long-distance network transmission architecture and related devices

technical field

The present invention relates to a long-distance network transmission technology for digital signals, in particular to a long-distance network transmission architecture and related devices, and a physical layer device (Digital Signal Processing Physical, hereinafter referred to as DSP PHY) with digital signal processing technology.

Background technique

Due to the rapid development of the information industry in recent years, the application of traditional information has gradually evolved from simple calculation processing, document processing and local area network (LAN) applications to the transmission of network information through wide area network (WAN) connections. Furthermore, the functions of personal computers (PC) have been greatly improved and the prices have been greatly reduced, which has promoted the popularization of high-function data processing systems; in addition, after the Internet (Internet) has been transformed from an academic research network to a commercial system, due to the maturity of related technologies and the price of network use Low cost, abundant resources and wide range of connections, coupled with the rapid development of multimedia technology, especially Hypertext and WEB technology, simplify the way computers are used, leading to the rapid growth of the Internet. Since the data content of multimedia information is richer and the amount of data is larger, the amount of data carried by the network has increased significantly, and the general network capacity has been unable to meet the needs of users; The application (VoIP) demand is strong, and the traditional network transmission function cannot handle it. Therefore, the support of a broadband multimedia network that can transmit a large amount of information in real time is required to meet the needs of the application system. Therefore, improving network transmission speed has become an important topic for the long-term development of the Internet.

The direction of network speed improvement can be roughly divided into three directions: (1) Utilize the original network system that has already been set up with a large number of connected objects, and make technical improvements to provide high-speed transmission capabilities, with the development of digital subscriber line (xDSL) system As the most important example, use the traditional telephone network system for high-speed data transmission; (2) use the system that was originally not a computer network to provide new technologies and equipment to enable high-speed information networks, using coaxial cables The development of Cable Modem and Hybrid Fiber Coaxial (HFC) is the most important example. Cable TV lines are used as high-speed data transmission for on-demand video services; (3) Development New technologies, such as information systems that provide high-speed transmission, such as Asynchronous Transfer Mode (ATM), Fast Ethernet and GIGA Switch, are the main examples.

xDSL With the vigorous development of the Internet, telephone companies feel the increasing bandwidth demanded by users, as well as the competition from cable television to actively upgrade the network architecture and provide integrated data network services. In the early 1990s, American telephone companies focused their business strategies on merging cable TV companies, and even operating cable TV businesses across the sea. They were nothing more than fancy cable TV's high penetration rate and broadband network, but they ignored the value of their own huge twisted pair network. . For telephone companies, using XDSL technology to provide high-speed network services on existing telephone lines is the most practical niche for developing broadband network services. XDSL is a general term for a technology that was first developed by Bellcore and AT&T in the late 1980s. It mainly provides high-speed data transmission services on traditional twisted-pair telephone lines with a new generation of different levels of modulation technology.

DSL is the abbreviation of Digital Subscriber Line in English, that is, digital subscriber loop. People who often use the Internet know that the signal processed and transmitted by the network is digital information, but the telephone line that is usually dialed is an analog line, which can only transmit analog signals such as voice. The modem (Modulator-Demodulator, Modem) converts the digital signal of the computer into an analog signal, and then transmits it on the telephone line, so this produces the DSL technology. Because DSL directly modulates the digital signal on the telephone line without analog/digital conversion, it can obtain a much higher frequency bandwidth and rate than ordinary modems. At present, 56Kbps is the limit rate on ordinary telephone lines. Therefore, DSL technology is an advanced modulation technology. It is connected to a DSL modem (DSL Modem) at both ends of a twisted-pair copper wire (that is, an ordinary telephone line), and uses the high-frequency bandwidth characteristics of digital signals to perform modulation. Transfer data at high speed. If a splitter for separating audio frequency band and high frequency band is configured, telephone and high-speed data services can be provided at the same time.

Members of the xDSL family include: High bit rate DSL (HDSL), asymmetric digital subscriber loop (Asymmetric DSL, ADSL), symmetrical digital subscriber loop (SymmetricDSL, SDSL), ISDN digital subscriber loop (ISDN DSL, IDSL) ) and very high bit rate DSL (hereinafter referred to as VDSL), these technologies mainly differ in signal modulation technology, transmission speed and distance, and other derivative factors such as network terminal location and erection costs. VDSL has the fastest transmission speed among all XDSL families, with a downstream direction of 13 to 55Mbps and an upstream direction of 1.5 to 2.3Mbps. Due to its high bit rate, it is regarded as a low-cost alternative to Fiber To Home (FTTH) or Fiber To the Community (Fiber To the Curb; FTTC); the transmission distance of this asymmetric transmission method, The network transmission architecture is about 300 meters from the computer room to the user. If you want to extend the transmission distance, you can use the optical network switching unit (Optical Network Unit, ONU) connection method, and use optical fiber cables from the computer room to the optical network switching unit. , Only twisted-pair telephone copper wires are used between the optical fiber network switching unit and the user, so that the transmission distance can be extended to 1.4 kilometers. However, there is no standard platform for various specifications of VDSL at present.

Please refer to FIG. 1 , which shows the VDSL network transmission architecture and related devices in the prior art. The VDSL network architecture can be divided into central office 11 (Central office, CO), optical network switching unit 12 (ONU), and customer premise equipment (Customer Premises Equipment, CPE); the central office 11 equipment is mainly connected to the Internet and can be regarded as a VDSL terminal The central office 11 is connected with the optical network switching unit 12 by the optical network 111 (OpticalNetwork Unit), and the optical network switching unit 12 includes a switch (Switch) 121 and a VDSL modem 13 (VDSL Modem), through which the device network information passes through The service network is connected in series with various network services, and after the data signal is modulated by the VDSL modem 13, the modulated data signal is transmitted to the VDSL modem 13 through the conventional telephone line 112 to demodulate and receive the data signal. Send it to the client again, and the client device includes: VDSL modem 13, network interface card 14 (Network Interface Card, NIC) and personal computer 15 (PC); after the data signal after demodulation is transmitted to the client device , the modulation of the VDSL modem 13 is restored to the information that the personal computer 15 can receive, and then the data signal conversion (analog/digital conversion) is sent to the personal computer 15 through the network transmission line 113 through the network interface card 14 . The method of transmitting the data signal from the personal computer 15 to the central office 11 is also the same. As mentioned above in the conventional technology, although the VDSL architecture can use the existing telephone network lines to transmit data signals, it is quite convenient in network wiring, and reaches a transmission distance of about 3000-4000 feet, and a transmission rate of about 26Mbps; However, its disadvantage is that the cost of the VDSL modem device is too expensive and cannot be popularized, and the too old telephone transmission line will reduce the transmission rate of the data signal. Therefore, the present invention provides a long-distance network transmission framework and related devices to increase the transmission distance of data signals on the network and the transmission rate of network data signals, while effectively reducing the cost of network transmission framework and enabling the construction of network transmission framework It is more convenient to increase the penetration rate of the general public to install this system.

Contents of the invention

The main purpose of the present invention is to provide a long-distance network transmission architecture and related devices, using a repeater with DSP PHY and cooperating with CAT 5 network transmission lines to increase the distance of network data signal transmission, through the present invention can be The data signal transmission distance is extended to 400 meters, and there is no need to limit the equipment level of the user end.

The second purpose of the present invention is to increase the transmission speed of the long-distance network transmission framework. Through the present invention, the transmission speed can be increased to 100 Mbps to benefit business opportunities in the future broadband market.

Yet another object of the present invention, because the long-distance network transmission framework of the present invention and relevant device thereof have reduced the VDSL modem device in the prior art, and cooperate existing network transmission line framework and the original hardware equipment of client end, make it in The cost of installing this system can be greatly reduced to facilitate the installation and use of the general public.

To achieve the above object, a long-distance network transmission framework of the present invention includes: a network switching unit for exchanging data signals between a first network and a second network; and a repeater with a first One end interface is connected to the aforementioned network switching unit through a first network transmission line, and a second end interface is connected to a user end device through a second network transmission line; wherein, the first end interface has a digital signal processing The physical layer device processes the signal received on the transmission line of the first network by digital signal processing technology.

The aforementioned first network transmission line can support power supply. The first-end interface supports full-duplex data transmission and reception. The first network transmission line is a CAT 5 network transmission line. The CAT 5 network transmission cable has 4 pairs of transmission lines, of which 2 pairs of transmission lines support power supply, and the other 2 pairs of transmission lines support full-duplex data transmission and reception.

The present invention also provides a repeater, including: a first terminal interface with a physical layer device for digital signal processing, connected to a network switching unit via a first network transmission line; and a second terminal interface with a The physical layer device is connected to a client device via a second network transmission line; wherein the digital signal processing physical layer device of the first interface processes signals received by the first network transmission line through digital signal processing technology.

Both the first network transmission line and the aforementioned second network transmission line are CAT 5 network transmission lines. The first network transmission line has 4 pairs of transmission lines, wherein 2 pairs of transmission lines support power supply, and the other 2 pairs of transmission lines support full-duplex data transmission and reception. The second network transmission line has 4 pairs of transmission lines, 2 pairs of transmission lines support power supply, and the other 2 pairs of transmission lines support full-duplex data transmission and reception.

The long-distance network transmission framework and related devices of the present invention will have many advantages and features, wherein the present invention increases the transmission distance of data signals on the network and the transmission rate of network data signals, wherein the transmission rate of data signals is two-way 100Mbps, transmission The distance reaches 300 to 400 meters; at the same time, the present invention can effectively reduce the cost of the network transmission structure, which can save hardware costs for network communication operators and users, and makes the construction of the network transmission structure more convenient, so as to increase the cost of installing this system for ordinary people penetration rate.

Description of drawings

Fig. 1 is the schematic diagram of prior art VDSL network transmission architecture;

Fig. 2 is a schematic diagram of the long-distance network transmission architecture of the present invention;

FIG. 3 shows the basic internal structure of the repeater in the long-distance network transmission architecture of the present invention.

Detailed ways

In view of the prior art, in the VDSL network transmission architecture, any data signal transmitted by VDSL on the telephone line must first be modulated on the telephone line by the VDSL modem, so that the VDSL data signal can be transmitted at high speed. However, due to the high cost of the VDSL modem, it cannot be popularized by ordinary users. The present invention then proposes a long-distance network transmission architecture and related devices, which use a chip repeater with a digital signal processing technology (DSP PHY) chip to cooperate with a CAT 5 network transmission line to improve long-distance network transmission capabilities , to replace the conventional technology using VDSL modem, and without changing the device and network transmission wiring at the user end, a longer data signal transmission distance and a good high-speed transmission rate can be obtained, and at the same time, the installation cost of the long-distance network transmission architecture system can be reduced .

The advantages and features of the long-distance network transmission architecture and related devices of the present invention will be further understood from the following detailed description and the accompanying drawings.

First, please refer to FIG. 2 , which shows a long-distance network transmission architecture diagram of the present invention. Firstly introduce the architecture diagram of one specific embodiment of the transmission mode from the central office 11 to the user end in the present invention, its architecture includes: a central office 11 equipment, in order to be connected with the network switching unit 21 through the network transmission line; a network switching unit 21, which includes: a media access unit 211 (MAC) and a physical layer device (DSP PHY) 212 with digital signal processing capabilities, through which the data signals on the network are driven to the CAT 5 network transmission line 213 through the DSP PHY 212; CAT 5 (Category 5, CAT 5) network transmission line 213, used to connect the network transmission line between the network switching unit 21 and the repeater 22 and the repeater 22 and the user end, wherein between the network switching unit 21 and the repeater 22 The transmission line 213 between them can transmit power, and the aforementioned data signal is transmitted to the repeater 22 through the CAT 5 network transmission line 213; a repeater (Repeater) 22 obtains power through the CAT 5 network transmission line connected to the network switching unit 21, and passes After the digital signal processing (DSP) inside the repeater 22 restores the aforementioned data signal, it is transmitted to the client through another CAT 5 network transmission line 213, wherein the client includes: a network interface card 14 and a personal computer 15 , the network interface card 14 is used to receive data signals on the network.

In further detail, the basic procedure included in the transmission method of the long-distance network transmission framework of the present invention is: in a network switching unit 21, a physical layer device (DSP PHY) 212 utilizing digital signal processing technology is used to replace the VDSL modem 13. A repeater 22 is provided between the aforementioned network switching unit 21 and the user end equipment, and the physical layer device 212 connected to the aforementioned repeater 22 and the aforementioned network switching unit 21 utilizes special modulation technology and digital signal processing technology, to carry out long-distance network transmission and reception; and support power supply and full-duplex data transmission on the transmission line connected between the aforementioned repeater 22 and the aforementioned network switching unit 21, wherein, in the preferred implementation of the present invention In the example, a CAT 5 network transmission line 213 can be used to support power supply and full-duplex data transmission on the transmission line, because currently the CAT 5 network transmission line 213 provides 4 pairs of transmission lines, 2 pairs of transmission lines support full-duplex data transmission, and the other 2 pairs of transmission lines are idle Can be used to support power supply.

Please refer to Fig. 2 again, the network switching unit 21 mainly includes a media access unit 211 and a physical layer device (DSP PHY) 212 with digital signal processing technology. Use the function of switching between networks and networks; in this embodiment, the central office 11 can use special modulation (Modulation) technology to carry out long-distance transmission if the central office 11 wants to send the signal to the user at the other end. Modulation technology varies with each manufacturer's technology. For example, the use of Gigabit modulation technology, etc., is an existing technology and can be understood by skilled people, so I won't repeat it here. The signal will suffer serious interference and attenuation after long-distance transmission, and the receiving end must be processed by digital signal before it can be retrieved (Retrieve).

Generally speaking, the rate of the digital signal modulated by the VDSL modem is about 26Mbps, and the transmission distance is 3000-4000 feet. After the signal is transmitted over a long distance of about 300 meters, the attenuation of the signal is very serious and it is difficult to retrieve it. In the present invention, the physical layer device (DSPPHY) 212 with digital signal processing capability is used to modulate the data signal on the network transmission line through a special modulation technology, and the digital signal modulation technology is used to shape and restore the attenuated data signal on the network. Its data transmission rate can reach two-way 100Mbps, and the transmission distance can reach 300 to 400 meters, so that the transmission line can transmit data signals with higher speed and higher capacity than VDSL over long distances. However, such a high-speed and high-capacity data signal cannot be transmitted on an old telephone line, so the present invention utilizes a CAT 5 network transmission line 213 as the network switching unit 21 and the repeater 22, and the repeater 22 and the user The transmission line between the terminals; preferably, the power supply of the repeater 22 is obtained by connecting the network switching unit 21 via the CAT 5 network transmission line 213.

CAT 5 network transmission line 213 is a common transmission line, which is cheap and can provide a transmission rate of more than 100Mbps; in the current situation, this low-cost CAT is used in general newly built communities or buildings 5 network transmission lines 213; because the CAT 5 network transmission lines 213 have a large transmission bandwidth and fast transmission rate, they are very suitable for full-duplex data signal transmission lines in the long-distance network transmission framework of the present invention; again, CAT 5 network Another advantage of the transmission line 213 is that since there are four pairs of transmission lines in the current CAT 5 network transmission line 213, only two pairs of transmission lines are currently used for full-duplex data signal transmission lines as explained above, while the other two pairs of lines If it is idle, then the present invention utilizes the idle transmission line to support the power supply (Carry Power), and transmits the power to provide the power supply of the repeater 22. In this way, the CAT 5 network transmission line 213 can be fully utilized, At the same time, the volume of the repeater 22 is reduced and no additional power supply is required, which makes installation very convenient.

As mentioned above, the data signal transmitted by the network switching unit 21 is sent to the repeater 22 after being transmitted through the CAT 5 network transmission line 213; because in the present invention, the data signal itself will gradually weaken after being transmitted over a long distance of 300 meters. Due to serious drift and deformation, the user end cannot recognize and retrieve the data signal, so the data signal must be demodulated and modulated by the digital signal processing of the repeater 22 before the data signal can be sent to the user end. Please refer to FIG. 3 , which shows the internal structure of the repeater of the present invention. The repeater 22 of the present invention includes: a first interface connected to a network switching unit 12 via a long-distance (up to about 300 to 400 meters) CAT5 network transmission line 213, and the CAT5 network transmission line 213 can support power supply supply and full-duplex data transmission, and the first interface is a physical layer device (DSP PHY) 212 with digital signal processing technology; and a second interface is connected to the user end equipment through another transmission line, which can be a general PHY 214 or DSP PHY. In the embodiment of the present invention, the repeater 22 and the network switching unit 21 are connected via the long-distance CAT 5 network transmission line 213, so the first end interface has drifted or is already on the CAT 5 network transmission line 213 using this DSP PHY 212 The deformed data signal is restored to its integer form so that the data signal can be identified by subsequent devices; the first end interface of the repeater 22 can transmit and receive the data signal on the long-distance network transmission line; and the second end of the repeater 22 The port interface is not limited to the implementation of the DSP PHY, it is better to conform to the data signal modulated by the general physical layer device (PHY).

Please continue to refer to as shown in Figure 3, there are two pairs of network transmission lines in the aforementioned CAT 5 network transmission line 213 that can be used to transmit power to provide the use of the repeater 22, so the side connected to the network switching unit 21 in the repeater 22 of the present invention The first terminal interface has the ability to handle the power supply, so as to supply the use of the power in the repeater 22; the aforementioned data signal is reshaped and restored by the DSP PHY 212, and then the data signal is sent to the PHY 214, because the commercially available The network interface card 14 of the network interface card 14 has its certain data transmission standards and specifications. It is not feasible to change the specifications formulated by it. Therefore, the data signal reconstructed and restored by the DSP PHY 212 passes through the physical layer device of the general Ethernet network ( PHY) 214 is modulated into a data signal that can be recognized by the PHY in the network interface card 14. For people who use this system, it is not necessary to replace the network interface card 14 in the personal computer 15, and the user end can retain the original Some hardware devices do not need to upgrade the network interface card 14 device with the long-distance network transmission framework of the present invention, which effectively reduces the cost that users must pay, and can be easily accepted by the market.

Generally speaking, in order to keep the overall appearance of the community or the building beautiful and not damaged, the repeater 22 is usually installed in the transformer box of the community or the building, and the power required by the repeater 22 is direct current, which is different from the general The AC power of the mains power is different, so when using the mains power, one must first try to obtain the AC power of the mains from the surrounding environment, and then convert it into a DC power before supplying the repeater 22 for use. However, the internal space of the distribution box in the community or building is limited, not only the installation is difficult, the power supply is inconvenient, but also if it is installed in the distribution box, the internal space will be too crowded, which will cause danger; so this The invention uses the idle network transmission line of the CAT 5 network transmission line 213 to transmit the power required by the repeater 22, which can reduce the manufacturing cost and volume of the repeater 22, and make the location of the repeater 22 easier and more convenient.

The repeater 22 of the present invention typically includes a small circuit board, on which a single chip (Single Chip) with two ports (TwoPorts), related circuits, rectification circuits and two connectors are placed, so this circuit board can be very small , so that the overall repeater 22 is also very light, and the installation location is not limited. According to the current technology, it is already possible to integrate 8-port physical devices into the same chip, so the area of the dual-port single chip integrating the above-mentioned structure can be very small, so that the cost is very low.

After passing through the signal modulated by the PHY 214 in the repeater 22, it is then transmitted to the user terminal through the CAT 5 network transmission line 213. Since the data signal at this time is already a data signal that the network interface card 14 can recognize, the user It is only necessary to prepare a CAT 5 network transmission line 213, one end of which is connected to the network interface card 14, and the personal computer 15 can use the long-distance network transmission architecture of the present invention through the network interface card 14. At this time, the user end does not need to be installed as conventional Expensive VDSL modem, or update any corresponding modem, to achieve the purpose of long-distance mass transmission; at the same time, there is no need to add additional power supply to make it more convenient for users to install this system.

The above-described embodiments are only to illustrate the technical ideas and characteristics of the present invention, and its purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly, and the present invention is not limited to the embodiments of the specification. For example: in the long-distance network transmission architecture and related devices of the present invention, the repeater itself can use the external power transmitted from the network switching unit, or the power provided by the repeater itself.

Claims (16)

1. A long-distance network transmission architecture, characterized in that it comprises: a network switching unit for exchanging data signals between a first network and a second network; and A repeater has a first interface connected to the aforementioned network switching unit via a first network transmission line, and a second interface connected to a client device via a second network transmission line; Wherein, the first terminal interface has a physical layer device for digital signal processing, and processes the signal received by the aforementioned first network transmission line through digital signal processing technology, and the aforementioned first network transmission line provides power supply to the aforementioned repeater . 2. The long-distance network transmission framework according to claim 1, wherein the first interface supports full-duplex data transmission and reception. 3. The long-distance network transmission framework as claimed in claim 1, characterized in that: the aforementioned first network transmission line is a CAT 5 network transmission line. 4. The long-distance network transmission architecture as claimed in claim 3, characterized in that: the aforementioned CAT 5 network transmission line has 4 pairs of transmission lines, wherein 2 pairs of transmission lines support power supply, and the other 2 pairs of transmission lines support full-duplex data transmission and reception. 5. The long-distance network transmission framework as claimed in claim 3, characterized in that: the length of the aforementioned CAT 5 network transmission line exceeds 300 meters. 6 . The long-distance network transmission framework according to claim 1 , wherein the aforementioned client equipment includes a network interface, and the network interface is connected to the second network transmission line of the aforementioned second terminal interface. 7 . 7. The long-distance network transmission framework according to claim 1, wherein the second terminal interface includes a physical layer device. 8. The long-distance network transmission framework as claimed in claim 1, characterized in that: the aforementioned second network transmission line is a CAT 5 network transmission line. 9. The long-distance network transmission architecture as claimed in claim 1, wherein the interface of the network switching unit connected to the first network transmission line includes a physical layer device for digital signal processing, which is processed by digital signal processing technology A signal received on a network transmission line. 10. A repeater, characterized in that it comprises: A first interface, having a physical layer device for digital signal processing, connected to a network switching unit via a first network transmission line; and A second end interface, having a physical layer device, connected to a user end device through a second network transmission line; Wherein the digital signal processing physical layer device of the first interface processes the signal received by the first network transmission line through digital signal processing technology, and the first network transmission line provides power supply to the repeater. 11. The repeater according to claim 10, characterized in that: the first network transmission line and the second network transmission line are both CAT 5 network transmission lines. 12. The repeater as claimed in claim 10, wherein the first network transmission line has 4 pairs of transmission lines, of which 2 pairs of transmission lines support power supply, and the other 2 pairs of transmission lines support full-duplex data transmission and reception. 13. The repeater as claimed in claim 10, wherein the second network transmission line has 4 pairs of transmission lines, wherein 2 pairs of transmission lines support power supply, and the other 2 pairs of transmission lines support full-duplex data transmission and reception. 14. The repeater as claimed in claim 10, wherein the first port and the second port support full-duplex data transmission and reception. 15. The repeater according to claim 10, wherein the length of the first network transmission line exceeds 300 meters. 16. The repeater according to claim 10, characterized in that: the interface of the network switching unit connected to the transmission line of the first network includes a physical layer device for digital signal processing, which is processed by the first network through digital signal processing technology The signal received on the transmission line.

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