CN101540939A - Design scheme and PCB drawing of VDSL2 broadband access module - Google Patents

Abstract

The invention relates to the design scheme and the PCB drawing of a VDSL2 broadband access module, comprising a local side and a user side, wherein the local side is a pocket-sized module which is especially designed for an access network side, has high efficiency, can be expanded, is easy to install and can support ITU-TG. 993.2 VDSL2 service on an IP network in a special manner of advanced platform framework, and the user side is a VDSL2 long-distance Ethernet transmission module. As for the module, the VDSL2 technology is applied to the Ethernet, thus meeting the Ethernet transmission requirements simply only by the module through a pair of twisted-pair cables; bidirectional high-bandwidth transmission rate of 100Mbps/60Mbps can be achieved within 300 meters when a standard telephone line is used for transmission, and a transmission rate of 40Mbps/10Mbps can also be achieved when the transmission distance reaches 1000 meters.

Description

A kind of VDSL2 broadband access modular design scheme and PCB figure

Technical field

Patent of the present invention belongs to the broadband access network field, relates to a kind of very high bit rate digital subscriber line band access module of having a lot of social connections or rather.

Background technology

Asymmetrical Digital Subscriber Line (ADSL) and very high bit rate digital subscriber line road (VDSL) are the important component parts of xDSL series.XDSL comprises that also rate adaptation Digital Subscriber Line R-ADSL, IDSL promptly are several variety classeses such as ISDN DSL, high-speed digital subscriber line HDSL, single line subscriber digital line SDSL.

The VDSL technology is the fastest a kind of in the xDSL technology.The speed of downlink data is 13 and 15Mbps, can reach 55.2Mbps in theory; The speed of upstream data is 1.5 to 2.3Mbps.Reach as high as 19.2Mbps.

VDSL has adopted advanced modulation technique, i.e. different frequency ranges is used in uplink and downlink.Usually downstream rate is 0.9-3.4MHz; Speed uplink is 4.0-7.75MHz.Because VDSL provides bigger bandwidth, so can satisfy more business demand, comprise transmission hi-fi music and high definition TV, the pure MPEG2 information flow of multichannel, be that real full-service inserts means.In addition, the speed of VDSL and Ethernet speed (10Mbit/s) are very approaching, can be used as the extension of Ethernet fully, and distance is at " big Ethernet " more than 1 kilometer between the formation network node.

VDSL2 is a second generation VDSL technology, is up-to-date at present, state-of-the-art xDSL broadband access technology.VDSL2 can provide such as high definition TV (HDTV) telecom operators by standard copper cable telephone wire, video request program (video-on-demand), video conference (videoconferencing), business and VoIP advanced speech business such as high-speed Internet access, thus ability with the competition of cable provider and satellite provider possessed.The VDSL2 standard makes professional upload rate and passes speed down and can both reach 100Mbps, is ten times of existing ADSL business, and the long haul communication performance of similar ADSL can be provided simultaneously.

Companies such as Infineon, Huawei have all proposed the solution compatible fully with VDSL2 at present, the VINAX of Infineon can be in distance above utilizing the symmetric data rate that 100Mbps is provided up to the complete VDSL2 frequency spectrum of 30MHz on the copper cash of 1,150 foot (350 meters); VINAX has that 20dBm transmitted power and echo are eliminated, time domain quantizes and grid/functions such as Viterbi coding, can provide outstanding length apart from the VDSL2 performance, also promptly can reach the downstream data rate of 1-4Mbps on 16,000 feet (4-5 kilometer) distances.

VDSL2 is a kind of broadband access technology that has potentiality, and so-called " optical fiber activate business (fiber-extension) " can be provided, and being does not have and the direct-connected building of network fiber section of telecommunications company provides similar bandwidth of an optical fiber.But at present the like product of VDSL2 is also fewer, and the cost problem also is not controlled effectively, and does not obtain extensive commercialization.

The patent of invention content

In view of this, the main purpose of patent of the present invention is to provide a kind of VDSL2 broadband access Module Design scheme and PCB figure, for the user provides effective broadband service.

For achieving the above object, the technical scheme of patent of the present invention is achieved in that specifically the local side part is a core with 8 groups of VDSL2 special chips, finishes data and sends and receive analog functuion and the programmable discrete multitone, DMT Digital Subscriber Line modulation function that is necessary.Analog side is established No. 8 telephone lines and is linked to each other with the special chip group by AFE (Analog Front End, AFE (analog front end)), finishes the transmission and the reception of downlink data.The data input side is provided with a gigabit ethernet interface, finishes and being connected of router or switch, thereby inserts Internet.The data that gigabit ethernet interface is come in are finished physical layer encodes by a gigabit physical chip, import exchange chip then.Exchange chip links to each other with the special chip group by RMII (Reduced Media Independent Interface, RMII), finishes forwarding of data.Adopt a processor, link to each other by the reversing Media Independent Interface with exchange chip on the one hand, its function of exchange is controlled; Link to each other by host port with a CPLD on the other hand, to setting and control and the renewal of CPLD.CPLD preserves special chip and moves needed firmware, powers on and just can directly download from CPLD.Processor links to each other with a RJ45 interface by the gigabit physical chip, and PC can directly or by Internet link to each other with the local side module, finishes system management and status monitoring.

User side links to each other with the local side module by RJ11, by telephone wire communication.Downlink side is provided with the RJ45 interface, finishes Ethernet service and inserts.Middle finish analog-to-digital conversion by AFE (analog front end), VDSL2 special chip, physical chip, signal separate the mediation encoding and decoding.

As seen from the above technical solution, the user can utilize easy user side module, by telephone wire, both can finish broadband access flexibly at a high speed.And local side part is owing to finish the upgrading and the renewal of software by processor and CPLD, thus have good autgmentability, and can be based on friendly management and the monitoring of software of PC exploitation.

Description of drawings

Fig. 1 is a very high bit rate broadband access module whole design, comprises local side and user side part.Local side partly comprises the analog side module, data side module, special chip module, exchange chip module, processor module.User side partly comprises the analog side module, data side module and special chip module.

Fig. 2 is a local side part signal flow chart, and signal has experienced analog-to-digital conversion by analog end to digital end, and modulation and demodulation, converges and physical layer encodes at exchanges data, converts gigabit ethernet signal then to.

Fig. 3 is a user side part signal flow chart, and signal has experienced analog-to-digital conversion by analog end to digital end, and modulation and demodulation, and physical layer encodes convert gigabit ethernet signal then to.

Fig. 4 is the PCB figure of local side modular design scheme, and PCB is divided into 6 layers, externally is provided with 8 RJ11 interfaces, 2 RJ45 interfaces, a RS232 interface and a power interface.

Fig. 5 is the PCB figure of user side partial design scheme, and PCB is divided into 4 layers, externally is provided with 1 RJ11 interface, a RJ45 interface, a power interface and a toggle switch.

Embodiment

For the purpose, technical scheme and the advantage that make patent of the present invention is clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, patent of the present invention is described in further detail.

Very high frequency(VHF) digital subscriber line (VDSL2) the modular design scheme of patent of the present invention mainly adopts MT3201 and MT2201 as the VDSL2 core parts.

The supporting use of MT3201 and MT2201, as VDSL2 module-specific chip, it is powerful, and the performance brilliance can be supported long distance, the professional transparent transmission of high band wide data.MT3201 is according to ETSI and ansi standard, for the transmission and the reception of VDSL2 data provides the analog functuion that is necessary.Transmitter side comprises that the digital to analog converter of one 14 bit finishes 14 bit digital signal and drive to finish to the conversion of analog signal and a highly integrated circuit and drive output; Receiver side comprises that an integrated coil disturbs with the echo that reduces received signal, and gain is finished the conversion of analog signal to digital signal up to the variable gain amplifier of 35dB and the analog to digital converter of one 14 bit.MT2201 is a kind of programmable discrete multitone, DMT digital subscriber link modem, can support standard based on ITU-T SG15Q4 discrete multitone, DMT and IEEE 802.3 10PASS-TS, can support descending/upstream rate 100Mbps/60Mbps, up-downgoing can be carried 2048 carrier waves at most, total carrier wave can reach 4096, and inside has RAM to be used for downloading outside flash saved software or manages by the MAC mouth.

The VDSL2 broadband access modular design scheme of patent of the present invention comprises local side and client part.

As shown in Figure 1, local side partly is the module that Ethernet service can be extended expansion under long distance, at the VDSL2 interface that is respectively equipped with eight RJ11 aspect the port that connects, link to each other with user side by telephone wire, Ethernet interface with two RJ45, an access that is used for the Internet business, another dares to the management and the monitoring of custom system.The modulation and demodulation function of this module synthesis VDSL2 special chip, the flexible exchange capacity of exchange chip, the disposal ability that processor is powerful and the design of auxiliary circuit, the VDSL2 technology is applied on the Ethernet, can simply sees through a pair of twisted-pair feeder by this module and reach the demand of extending Ethernet.Owing to given full play to the core competence of VDSL2 special chip, whole CMTS is when the telephone wire transmission of the standard of use, 300 meters transmission rates that can reach two-way high frequency range with interior this module of use: pass 100Mbps down and upload 60Mbps, when distance reaches one kilometer, still can possess the speed that passes 40Mbps down and upload 10Mbps.The local side module externally provides a Gigabit Ethernet, is uploaded to router or Ethernet switch with the connectivity port as the internet, and eight groups VDSL2 interface internally is provided.Local side part signal shift process as shown in Figure 2.

As shown in Figure 1, the user side module is the Ethernet extension of module of a long distance, and the VDSL2 interface having a RJ11 aspect the port that connects respectively is used for linking to each other with the local side module by telephone wire, with the Ethernet interface of a RJ45, be used for Ethernet service and insert.This module is applied in the VDSL2 technology on the Ethernet, can simply see through a pair of twisted-pair feeder by this module and reach the demand of extending Ethernet.During the transmission of the telephone wire of use standard, 300 meters transmission rates that can reach two-way high frequency range with interior this module of use: pass 100Mbps down and upload 60Mbps, when distance reaches one kilometer, still can possess the speed that passes 40Mbps down and upload 10Mbps.The firmware of special-purpose chip can pass through JTAG mouth down loading updating at any time in the line module.User side part signal shift process as shown in Figure 3.

As shown in Figure 4, rectangle has been adopted in the design of local side module PCB, is of a size of 330mm * 208mm, is designed to 6 layers altogether, is respectively top layer, bus plane, M signal layer, M signal layer, stratum and bottom.The interface concentration of using for the user comprises that in the Users panel side 8 RJ11 interfaces connect the user side module, and 1 RJ45 interface connects upstream router or switch, and 5 groups of indicator lights are indicated the operating state of local side modular system respectively.The back side is provided with a RJ45 interface and the RS232 interface is configured and manages system.The side is provided with power interface, powers to be the 3.3V DC power supply.

As shown in Figure 5, rectangle has been adopted in the design of user side module PCB, is of a size of 110mm * 77mm, is designed to 4 layers altogether, is respectively top layer, bus plane, stratum and bottom.The interface concentration of using for the user is in the Users panel side, comprise that 1 RJ11 interface connects the local side module, 1 RJ45 interface connects Downlink Switch, and HUB or PC, one group of toggle switch are used to control the mode of operation of this module and the operating state that 2 groups of indicator lights are indicated the local side modular system respectively.The back side is provided with power interface, and power supply is 9～12V DC power supply.

Claims (10)

1, the modular design scheme that very high bit rate inserts in a kind of broadband access network comprises local side module and user side module and PCB figure.The user side module links to each other with the local side module by RJ11, by telephone wire communication.The local side module is supported the QoS based on port, supports traffic policy, supports hardware based multicast functionality, 802.1g VLAN is supported in the restriction of support broadcast rate, supports IGMP snooping, has 1 Gigabit Ethernet Combo port, compatible 100/1000Based-Tx; The user side module meets supports Ethernet over VDSL bridge joint; 802.11d transparent bridging is supported 300 meters: descending 100Mbps; Up 60Mbps; 1000 meters: descending 40Mbps; Up 10Mbps.Support automatic 10/100Mbps to test the speed, the MDI/MDI-X intersection detects and error correction, supports full-duplex mode Flow Control function.

2, local side module according to claim 1 is characterized in that, is core with 8 groups of VDSL2 special chips, finishes data and sends and receive analog functuion and the programmable discrete multitone, DMT Digital Subscriber Line modulation function that is necessary.

3, analog functuion according to claim 2 is characterized in that, establishes No. 8 telephone lines and links to each other with the special chip group by AFE (Analog Front End, AFE (analog front end)), finishes the transmission and the reception of downlink data.

4, the reception of downlink data according to claim 3, it is characterized in that, data input pin is provided with a gigabit ethernet interface, finish linking to each other of up and router or switch, thereby insert Internet, the data that this gigabit ethernet interface is come in are finished physical layer encodes by a gigabit physical chip, import exchange chip then.

5, the transmission of downlink data according to claim 3 is characterized in that, exchange chip links to each other with the special chip group by RMII (Reduced Media Independent Interface, RMII), finishes forwarding of data.

6, local side module according to claim 1 is characterized in that, adopts a processor module to link to each other by the reversing Media Independent Interface with exchange chip on the one hand, and its function of exchange is controlled; Link to each other by host port with a CPLD on the other hand, the setting of CPLD is controlled with firmware and upgraded.CPLD preserves special chip and moves needed firmware, powers on and just can directly download from CPLD.Processor links to each other with a RJ45 interface by the gigabit physical chip, and PC can directly or by Internet link to each other with the local side module, finishes system management and status monitoring.

7, processor module according to claim 6, it is characterized in that having RS232 serial port and 10/100 Ethernet field management interface, gui management based on Web, SNMPv1 and v2c management, can select fast mode or interleave is mode, can adjust SNR margin, support VDSL MIB RFC-3728 standard, support VDSL MCM MIB RFC-4070 standard.

8, user side module according to claim 1 is characterized in that, finishes analog-to-digital conversion by AFE (analog front end), VDSL2 special chip, physical chip, signal separate the mediation encoding and decoding.

9, user side module according to claim 8 is characterized in that, can select local side or client mode, can select fast mode or interleave is mode, can select speed limit in 50Mbps/20Mbps, can adjust SNR margin, can carry out the upgrading and the renewal of firmware by TFTP.

10, according to described local side of claim 1 and user side module PCB figure, it is characterized in that adopt 6 layers of wiring and 4 layers of wiring respectively, size is respectively 330mm*208mm and 110mm*77mm (long * is wide).

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