WO2005081462A1 - Multiplexeur d'acces de ligne d'abonne numerique et procede de transmission de donnees pour augmenter la largeur de bandes de multidiffusion - Google Patents

Multiplexeur d'acces de ligne d'abonne numerique et procede de transmission de donnees pour augmenter la largeur de bandes de multidiffusion Download PDF

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Publication number
WO2005081462A1
WO2005081462A1 PCT/CN2005/000094 CN2005000094W WO2005081462A1 WO 2005081462 A1 WO2005081462 A1 WO 2005081462A1 CN 2005000094 W CN2005000094 W CN 2005000094W WO 2005081462 A1 WO2005081462 A1 WO 2005081462A1
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WIPO (PCT)
Prior art keywords
bus
video
user interface
multicast
dslam
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PCT/CN2005/000094
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English (en)
French (fr)
Inventor
Haijun Wu
Original Assignee
Huawei Technologies Co., Ltd.
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Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to US10/585,798 priority Critical patent/US20080043772A1/en
Priority to EP05700468A priority patent/EP1701480A4/en
Publication of WO2005081462A1 publication Critical patent/WO2005081462A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
    • H04N21/2385—Channel allocation; Bandwidth allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
    • H04N21/64—Addressing
    • H04N21/6405—Multicasting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/162—Authorising the user terminal, e.g. by paying; Registering the use of a subscription channel, e.g. billing

Definitions

  • Digital subscriber line access multiplexer for realizing multicast bandwidth expansion and data transmission method thereof
  • the present invention relates to communication access technology, and in particular, to a digital subscriber line access multiplexer (DSLAM) for realizing multicast bandwidth expansion and a data transmission method thereof.
  • DSLAM digital subscriber line access multiplexer
  • the multicast video network includes four components: a video headend system, an IP metropolitan area network, a broadband access network, and a home network.
  • the video head-end system implements video user management, CA / DRM (Conditional Acess / Digital Register Management, access permission and digital registration management), and uses MPEG-2 (a video and audio compression standard) encoding for multicast channels.
  • a stream is encapsulated into a UDP / IP (User Datagram Protocol / Internet Protocol) message, and then the video service stream is sent to the IP metropolitan area network.
  • the IP metropolitan area network uses the IP multicast function to send video service streams to the DSLAM equipment in the broadband access network.
  • the DSLAM copies the video service stream to the multicast user port to ensure that users receive the corresponding video programs.
  • a DSLAM device is composed of three parts: a main control board, a user interface board, and a backplane.
  • the main control board is composed of a control module and a data processing module, and provides a control function, a function of processing and distributing data streams, and an uplink network side interface.
  • the user interface board provides an external user access interface.
  • Different user interface boards provide different access methods, which can be one of ADSL (Asymmetric Digital Subscriber Ring), VDSL (Very High Speed Digital Subscriber Ring), Ethernet, G.SHDSL, etc.
  • ADSL Asymmetric Digital Subscriber Ring
  • VDSL Very High Speed Digital Subscriber Ring
  • Ethernet G.SHDSL
  • G.SHDSL G.SHDSL
  • DSLAM can simultaneously provide Multiple user interface boards.
  • Each user interface board can provide a certain number of user interfaces.
  • the ADSL board can provide 32 or 48 or even 64 interfaces.
  • the user interface board is usually controlled by the control module. Blocks and data processing modules, if it is centralized controlled by the main control board, there may not be a control module on the user interface board; the backplane provides the connection between the main control board and the user interface board, the main control board and the user interface board Both are fixed on the slots of the backplane.
  • the backplane also provides a data bus for data transmission between the main control board and the user interface board.
  • the two main control boards that provide the active / standby switching function are connected to each user interface board through the data bus provided by the backplane.
  • the main control board When performing the multicast service, the main control board will first The broadcast video service stream is copied to a data bus connected to each user interface board, and then the user interface board receives the video service stream and sends it to the corresponding user interface. Since there is only one data bus for communication between the main control board and the user interface board on the backplane, the video service flow and user data service copied by the main control board will be transmitted to the user interface board in the same set of buses. With the development of a large number of video programs, the bandwidth of each multicast channel can be from 1M to 4M.
  • the required bandwidth of HDTV high-definition television
  • HDTV high-definition television
  • channels provide users with a variety of entertainment choices: higher requirements are placed on the bandwidth requirements inside DSLAM equipment. Take the bandwidth requirement of 200 channels as an example. Assume that each channel is 4M. In this way, the DSLAM device has a multicast bandwidth requirement of up to 800-1G, which requires that the multicast bandwidth of the DSLAM is 800-1G. Corresponding video business needs.
  • a star-shaped FE bus between a main control board and a user interface board is generally used as a data bus, and its bandwidth is FE 100Mbits / s.
  • Such a bandwidth cannot meet the bandwidth requirements of video multicast at all.
  • a user interface board provides 64 ADSL interfaces
  • users supporting each port can enjoy two multicast video programs. If the 64 ADSL interfaces all request different video programs, then from the main control board to Each user interface board needs to support the transmission of 128 video programs.
  • each video program is 4Mbits / s
  • the connection bandwidth requirement between the main control board and the interface board is at least 512Mbits / s. Therefore, if users on each port can enjoy more multicast video programs, the main control board to the user interface board The greater the bandwidth required by the data bus, the existing DSLAM cannot support the support of video services.
  • An object of the present invention is to provide a DSLAM that implements multicast bandwidth expansion and a data transmission method thereof, so as to achieve expansion of multicast bandwidth, so that the DSLAM can support a larger number of multicast channels.
  • the DSLAM for implementing multicast bandwidth expansion includes a main control board, a user interface board, and a data bus.
  • the main control board is connected to each user interface board through a data bus, and is characterized in that the main control board and each user
  • the interface boards are also connected by a video bus for transmitting video service streams.
  • the DSLAM further includes a multicast distributor.
  • the main control board includes a data processing module and a control module connected to the DSLAM.
  • the video service stream output by the data processing module is sent to the input end of the multicast distributor.
  • the output of the multicast distributor is connected to the video bus.
  • the video bus is a point-to-point star bus connected to the output of the multicast distributor and the data processing module of each user interface board, and the multicast distributor copies the input video service stream according to the number of user interface boards connected to it. Then output to each user interface board.
  • the video bus is a shared bus in which the output of the multicast distributor and the data processing modules of each user interface board are connected in parallel.
  • the multicast distributor broadcasts the input video service stream to each user interface board through the video bus.
  • the number of video buses is multiple sets of buses, and each set of buses carries video service streams containing different video channels.
  • the video bus is a Gigabit Ethernet bus or a cell bus.
  • the video bus is a unidirectional bus that sends video service streams from the main control board to the user service board.
  • the present invention provides a DSLAM data transmission method for implementing multicast bandwidth expansion, including: a main control board in a digital subscriber line access multiplexer determines whether a service from a network interface is a video service stream, and if so, passes the DSLAM The video bus added in China is sent to each user interface board; otherwise, it is sent to each user interface board through the DSLAM original data bus.
  • the step of sending to the user interface board through the video bus added in the DSLAM includes: the data processing module in the main control board sends a video service stream to the multicast distributor, and the multicast distributor transparently transmits the video service stream to the video bus. And broadcast to the data processing module of each user interface board through the shared video bus.
  • the step of sending to the user interface board through the video bus added in the DSLAM includes: the data processing module in the main control board sends the video service stream to the multicast distributor, and the multicast distributor sends the video service stream to the user to which it is connected
  • the number of interface boards is duplicated, and the duplicated video service stream is output to the data processing module of each user interface board through a point-to-point star bus connected to each user service board through a multicast distributor.
  • the method further includes: the data processing module of the user interface board receives a video service stream from the video bus, and copies the video service stream to a multicast user port.
  • the data processing module of the user interface board determines whether the service received from the video bus is a video service stream, and if so, copies the video service stream to a multicast user port, otherwise discards it.
  • All data received by the user interface board from the user side is transmitted to the main control board through the original data bus.
  • the present invention uses a data bus of the original main control board and user interface board in the DSLAM, and adds a video bus dedicated to transmitting video service streams. Therefore, the problem that the DSLAM in the prior art cannot meet the video multicast bandwidth requirement is solved.
  • the implementation of the present invention enables the DSLAM to realize the expansion of the multicast bandwidth at a lower cost and meet the corresponding video Multicast bandwidth requirements.
  • the bandwidth of a single star bus can be as high as 1.25G, the number of multicast channels can support more than 300, and the multicast distributor Repeater (replicator) or MUX used in the present invention.
  • the price of (multiplexer) is much lower than that of a full GE switch chip.
  • the bandwidth of a single shared bus can also be as high as 1.2G or more, and it can support more than 240 high-bandwidth video programs.
  • Figure 1 is a schematic diagram of a multicast video network
  • FIG. 2 is a schematic structural diagram of an existing DSLAM
  • FIG. 3 is a schematic diagram of a connection structure between an existing user interface board and a main control board
  • FIG. 4 is a schematic structural diagram of a DSLAM in the present invention.
  • Figure 5 is a schematic diagram of the connection structure between the user interface board and the main control board in the present invention 1;
  • Figure 6 is a schematic diagram of the connection structure between the user interface board and the main control board in the present invention.
  • the invention constructs a video bus on the backplane of the DSLAM, which is specifically used for the transmission of the video service flow from the main control board to the user interface board, thereby separating the video channel from the traditional data channel and realizing the bandwidth of the backplane. Expansion.
  • the structure of the DSLAM that implements multicast bandwidth expansion according to the present invention is shown in FIG. 4.
  • the main control board and the user interface board are both plugged into the slots of the backplane and connected through the data bus and video bus.
  • the thick solid line shown on the back panel is the video bus, which is a newly added bus of the present invention, and is used to transmit video service streams between the main control board and the user interface board. It can be a GE bus or a cell bus.
  • the thin solid line is the data bus, which is the original Line for transmitting data services other than video data services between the main control board and the user interface board.
  • the data bus may be a FE bus, a GE bus, etc .; the video bus is a set of unidirectional transmissions. Data bus.
  • the direction of data transmission is only from the main control board to the user interface board. It is used to send the video multicast data received by the main control board to the user interface board.
  • the video bus can use the star bus connection method or the Shared broadcast bus. In the present invention, the setting of the newly added video bus makes the expansion of the multicast bandwidth of the DSLAM more convenient and easy, and the cost is lower.
  • one or more new video buses may be added. If there are multiple video buses, corresponding processing functions need to be added to the data processing module of the main control board, which is convenient.
  • an idle or suitable video bus is selected for video data service transmission.
  • FIG. 5 shows a connection diagram of the video bus in the present invention using a star bus mode.
  • a multicast distributor module 100 is added to the output position of the data processing module of the original main control board (that is, the corresponding Bus interface module), each output of this module is connected to each user interface board through a star bus, and its function is to send a single video service stream to the video bus, which is then sent to each user interface board .
  • the multicast distributor module in the star bus mode is a one-in, multiple-out replication function module. The number of output interfaces of this module is equal to the number of user interface boards.
  • the video bus may be selected from an LVDS (Low Voltage Differential Signal) bus or a GE (Gigabit Ethernet) bus, and a corresponding multicast distributor module may select an LVDS Repeater. (Duplicator) device or select GE Mux (GE Multiplexer) device.
  • the data processing module of the user interface board also needs to expand the interface provided by the multicast video bus, receive the delivery of the video service stream, then copy it, and send it to the multicast user port together with the data service stream. Based on the star connection shown in FIG.
  • the data transmission process is as follows:
  • the data processing module in the main control board receives the service flow from the network interface, determines whether the received service flow is a video service flow, and if so, outputs To the multicast distributor, otherwise it is output to the data bus and sent to the user interface board through the data bus;
  • the multicast distributor After receiving the video service stream, the multicast distributor copies the video service stream by the same number of copies according to the number of connected user service boards in the broadcast sending mode, and copies the video service stream according to the multicast configuration in the multicast mode.
  • the bus sends to the data processing module of the user interface board;
  • the data processing module of the user interface board determines whether the service flow from the video bus is a video service flow. If so, the video service flow is copied by the same number of copies according to the number of multicast user ports, and the received data is received in a multicast manner. The data streams of the bus are sent to the user terminal together, otherwise the video service stream is discarded.
  • the multicast distributor can distribute video service streams of different video channels to different star buses through logical control. For example, the multicast distributor sends the video service stream of the first multicast source address to the first star bus, and sends the video service stream of the second multicast source address to the second star bus.
  • FIG. 6 shows a schematic diagram of the connection of the video bus in the present invention in a shared bus mode.
  • a multicast distributor module with a shared bus interface is added to the output position of the data processing module of the original main control board. 100 (that is, the corresponding bus interface module), the output of this module and each user interface board are connected in parallel through a shared bus.
  • the function of the multicast distributor module 100 in the shared bus mode is to drive a single video service to pass to Shared bus, because the bus is shared, so it is transmitted to each user interface board on the backplane by broadcast; the user interface board selects the video service stream broadcasted by the shared bus according to the multicast source address, and then copies it to Corresponding multicast user port.
  • Type bus can choose Cell Bus (cell bus, a data bus based on fixed-length units) bus or simplify the Cell Bus that only provides the sending function, or choose Utopia bus (an ATM interface bus), etc., multicast distributor module It is a one-to-one bus interface module.
  • the bus interface device of Cell Bus can be selected, so that the video service stream is broadcast to the user interface board.
  • the data processing module of the user interface board also needs to expand the interface that provides the multicast video bus, receives the delivery of the video service stream, then copies it, and sends it to the multicast user port together with the data service stream.
  • the data processing module in the main control board receives the service flow from the network interface, determines whether the received service flow is a video service flow, and if so, outputs To the multicast distributor, otherwise it is output to the data bus and sent to the user interface board through the data bus;
  • the multicast distributor After receiving the video service stream, the multicast distributor sends the broadcast data directly to the data processing module of the user interface board through the video bus.
  • the data processing module of the user interface board determines whether the service stream from the video bus is a video service stream. If so, the video service stream is copied by the same number of copies according to the number of multicast user ports, and is broadcasted to the received data bus from the data bus. The data stream is sent to the user terminal, such as STB (set-top box), TV (TV), PC (host), etc. Otherwise, the video service stream is discarded.
  • STB set-top box
  • TV TV
  • PC host
  • the data processing module of the user interface board in the star connection mode needs to provide two video bus interfaces to connect to the main and standby main control boards respectively, and the video data service needs to be transmitted on the backplane.
  • the data processing module of the user interface board In the shared bus mode, the data processing module of the user interface board only needs to provide a video bus interface, and the backplane only transmits a broadcast video data stream to ensure that each user interface board accurately receives the corresponding video data. business.
  • the multicast distributor can communicate with each other. Through logic control, video service streams of different video channels are distributed to different shared buses. For example, the multicast distributor sends the video service stream of the first multicast source address to the first shared bus, and sends the video service stream of the second multicast source address to the second shared bus.
  • all data received by the user interface board from the user side is transmitted to the main control board through the original data bus.
  • the new video bus in the present invention can be selected and applied according to the DSLAM multicast bandwidth requirements, such as the application cell bus or GE bus, etc., so the multicast bandwidth can be easily expanded to meet different multicast bandwidths in the network. Demand.
  • DSLAM multicast bandwidth requirements such as the application cell bus or GE bus, etc.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Computer Security & Cryptography (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Description

实现组播带宽扩展的数字用户线接入复用器及其数据传输方法 技术领域
本发明涉及通信接入技术， 尤其涉及一种实现组播带宽扩展的数字 用户线接入复用器（DSLAM )及其数据传输方法。 发明背景
随着大量的视频节目的发展， 组播视频业务已经越来越成为一种宽 带网络上的必须业务， 且所述的组播视频业务通常基于图 1所示的组网 模型实现， 图 1的组播视频网络包含视频头端系统、 IP城域网、 宽带接 入网和家庭网络四个组成部分。其中，视频头端系统实现视频用户管理、 CA/DRM ( Conditional Acess/Digital Register Management, 接入许可和 数字注册管理）、以及将组播频道采用 MPEG-2(—种图象声音压缩标准） 编码成一路码流封装到 UDP/IP (用户数据报协议 /互联网协议）报文中， 然后将视频业务流送入 IP城域网。 IP城域网通过 IP组播功能将视频业 务流送到宽带接入网中的 DSLAM设备， DSLAM将该视频业务流复制 到组播用户端口， 从而保证用户接收到相应的视频节目。
目前， DSLAM设备由三个部分组成： 主控板、 用户接口板、 背板。 如图 2所示， 其中， 主控板由控制模块和数据处理模块组成， 提供控制 功能、 数据流的处理分发和汇聚的功能以及上行网络侧接口等； 用户接 口板对外提供用户的接入接口， 不同的用户接口板提供不同的接入方 式， 可以是 ADSL (非对称数字用户环线）、 VDSL (甚高速数字用户环 线）、 以太网、 G.SHDSL等中的一种， 一般 DSLAM可以同时提供多个 用户接口板， 每块用户接口板可以提供一定数量的用户接口， 如 ADSL 板可以提供 32路或者 48路甚至 64路接口， 用户接口板通常由控制模 块和数据处理模块组成， 如果是由主控板集中控制， 那么用户接口板上 也可能没有控制模块； 背板提供了主控板和用户接口板之间的连接， 主 控板和用户接口板都固定在背板的槽位上， 背板还提供数据总线用于主 控板和用户接口板间的数据传送。
参见图 3所示， 图中提供主备倒换功能的两块主控板分别通过背板 提供的数据总线与每块用户接口板相连接， 在进行组播业务时， 主控板 首先会把组播视频业务流复制到与每个用户接口板相连的数据总线上， 然后用户接口板接收所述的视频业务流， 再发送给相应的用户接口。 由 于背板上只有一套用于主控板与用户接口板间通信的数据总线， 这样主 控板复制的视频业务流和用户数据业务将会在同一套总线内传送到用 户接口板。而随着大量的视频节目发展，每个组播频道的带宽可以从 1M 到 4M， 将来的 HDTV (高清晰度电视） 的需求带宽甚至高达 7M左右， 一般网络中可能会有 200个以上的视频频道为用户提供多种娱乐的选择: 对 DSLAM设备内部的带宽需求提出了更高的要求。 以 200个频道的带 宽需求为例， 假设每个频道为 4M, 这样， DSLAM设备便有了高达 800 - 1G的组播带宽的要求， 也就要求 DSLAM的组播带宽为 800 - 1G方 可以满足相应的视频业务的需求。
但在 DSLAM中， 一般采用主控板到用户接口板之间星型的 FE总 线作为数据总线， 其带宽是 FE 100Mbits/s, 这样的带宽根本无法满足视 频组播的带宽需求。 例如， 在一个用户接口板提供 64路 ADSL接口的 情况下， 支设每个端口的用户可以欣赏两个组播视频节目， 如果 64个 ADSL接口都点播不同的视频节目， 那么从主控板到每个用户接口板需 要支持 128个视频节目的传送， 如果每个视频节目 4Mbits/s， 那么对主 控板和接口板之间的连接带宽需求至少是 512Mbits/s。 因此， 如果每个 端口的用户可以欣赏的组播视频节目更多， 则主控板到用户接口板之间 数据总线需要的带宽越大,现有的 DSLAM无法支持对视频业务的支撑。 发明内容
本发明的目的是提供一种实现组播带宽扩展的 DSLAM及其数据传 输方法， 以实现针对组播带宽的扩展， 从而使得 DSLAM可以支持更多 的组播频道数目。
本发明提供的实现组播带宽扩展的 DSLAM包括主控板、 用户接口 板及数据总线， 主控板与各用户接口板间通过数据总线相连， 其特征在 于， 所述的主控板与各用户接口板间还通过用于传输视频业务流的视频 总线相连。
其中， 所述 DSLAM还包括组播分发器， 所述主控板包括数据处理 模块以及与^ 连的控制模块， 其中， 数据处理模块输出的视频业务流 送至组播分发器的输入端， 所述组播分发器的输出与所述视频总线相连 接。
所述视频总线为组播分发器的输出与各用户接口板的数据处理模块 分别相连的点对点星型总线， 所述组播分发器将输入的视频业务流按其 连接的用户接口板的数目复制后分别输出至各用户接口板。
所述视频总线为组播分发器的输出以及各用户接口板的数据处理模 块并接的共享型总线， 所述组播分发器将输入的视频业务流通过视频总 线广播至各用户接口板。
所述视频总线的数目为多套总线， 各套总线承载包含不同视频频道 的视频业务流。
所述视频总线为千兆以太网总线或信元总线。
所述的视频总线为从主控板发送视频业务流到用户业务板的单向总 线。 本发明提供一种实现组播带宽扩展的 DSLAM的数据传输方法， 包 括： 数字用户线接入复用器中的主控板判断来自网络接口的业务是否是 视频业务流， 如果是， 则通过 DSLAM中增设的视频总线发送至各用户 接口板， 否则， 则通过 DSLAM中原数据总线发送至各用户接口板。
所述通过 DSLAM 中增设的视频总线发送至用户接口板的步骤包 括， 由主控板中的数据处理模块向组播分发器发送视频业务流， 组播分 发器将视频业务流透传至视频总线， 并通过共享型视频总线广播至各用 户接口板的数据处理模块。
所述通过 DSLAM 中增设的视频总线发送至用户接口板的步骤包 括， 由主控板中的数据处理模块向组播分发器发送视频业务流， 组播分 发器将视频业务流按其连接的用户接口板的数目复制， 将复制的视频业 务流分别通过组播分发器与各用户业务板相连的点对点星型总线输出 至各用户接口板的数据处理模块。
该方法进一步包括， 用户接口板的数据处理模块从视频总线接收视 频业务流， 并将所述视频业务流复制到组播用户端口。
用户接口板的数据处理模块判断从视频总线接收的业务是否是视频 业务流， 如果是， 则将所述视频业务流复制到組播用户端口， 否则作丟 弃处理。
用户接口板从用户侧接收的所有数据均通过原有的数据总线传送给 主控板。
由上述本发明提供的技术方案可以看出， 本发明由于采用了在 DSLAM中原有的主控板与用户接口板的数据总线的的基础上再增加 一条专门用于传输视频业务流的视频总线， 因此， 解决了现有技术中 存在的 DSLAM无法满足视频组播带宽需求的问题。 本发明的实现使 得 DSLAM可以以较低的成本实现组播带宽的扩展， 满足相应的视频 组播带宽需求。
本发明的实现， 从带宽来看， 采用单独的星型总线型的带宽可以 高达 1.25G, 组播频道数可以支持 300个以上， 而且本发明采用的组 播分发器 Repeater (复制器） 或者 MUX (复用器） 的价格远低于全 GE的交换芯片； 采用单独的共享总线的带宽也可以高达 1.2G以上， 也可以支持 240个以上的高带宽视频节目。 附图简要说明
图 1为组播视频网络的示意图；
图 2为现有的 DSLAM的结构示意图；
图 3为现有的用户接口板与主控板间的连接结构示意图；
图 4为本发明中的 DSLAM的结构示意图；
图 5为本发明中用户接口板与主控板间的连接结构示意图 1;
图 6为本发明中用户接口板与主控板间的连接结构示意图 2。
实施本发明的方式
下面结合附图对本发明进行详细描述。
本发明在 DSLAM的背板上构建了一个视频总线， 专门用于主控 板到用户接口板的视频业务流的传送，从而将视频通道和传统的数据 通道分离开， 并实现了背板带宽的扩展。
本发明所述的实现组播带宽扩展的 DSLAM的结构如图 4所示， 主控板和用户接口板均嵌插接于背板的槽位中，并通过数据总线及视 频总线连接， 图中背板上所示的粗实线为视频总线， 为本发明新增加 的总线， 用于在主控板和用户接口板间.进行视频业务流的传输， 可以 为 GE总线或信元总线等， 细实线为数据总线， 为 DSLAM原有的总 线，用于在主控板和用户接口板间进行除视频数据业务外的其他数据 业务的传输， 数据总线可以为 FE总线、 GE总线等等； 所述的视频 总线是一组单向传输的数据总线，数据传送的方向仅为从主控板到用 户接口板， 用于将主控板收到的视频组播数据发送给用户接口板， 视 频总线可以采用星型总线连接方式， 也可以采用共享式的广播总线。 本发明中，新增视频总线的设置使得 DSLAM的组播带宽的扩展更为 方便容易， 且成本较低。
本发明中， 新增的视频总线可以为一条， 也可以为多条， 如果所 述的视频总线为多条时，则在主控板的数据处理模块上还需要增加相 应的处理功能，从而便于在视频业务的传输过程中选择空闲的或者合 适的视频总线进行视频数据业务的传输。
实施例 1:
如图 5所示， 图 5示出了本发明中的视频总线采用星型总线方式 的连接示意图，在原有主控板的数据处理模块的输出位置增加一个组 播分发器模块 100 (即为相应的总线接口模块）， 该模块的各输出通 过星型总线分别与各个用户接口板相连，其功能是将单一的视频业务 流送到视频总线上， 由视频总线再发送到每个用户接口板上。 星型总 线方式下的组播分发器模块是一个一进多出的复制功能模块，该模块 的输出接口数目等于用户接口板的数目。 星型总线连接方式中， 所述 的视频总线可以选择 LVDS ( Low Voltage Differential Signal , 低压差 分信号） 总线或者选择 GE (千兆以太网） 总线， 对应的组播分发器 模块便可以选择 LVDS的 Repeater (复制器） 器件或者选择 GE Mux ( GE复用器） 器件。 本发明在用户接口板的数据处理模块上也需要 扩展提供的组播视频总线的接口，接收视频业务流的下发，然后复制， 并与数据业务流一起发送至组播用户端口。 基于图 5所示的星型连接方式， 数据传输的过程如下： 主控板中的数据处理模块接收来自网络接口的业务流，判断所接 收的业务流是否是视频业务流， 如果是， 则输出至组播分发器， 否则 则输出至数据总线， 通过数据总线发送至用户接口板；
组播分发器收到视频业务流后，在广播发送方式下根据所连接的 用户业务板数将视频业务流复制相同份数，在组播方式下根据组播配 置复制视频业务流，然后通过视频总线发送至用户接口板的数据处理 模块；
用户接口板的数据处理模块判断来自视频总线的业务流是否是 视频业务流， 如果是， 则按组播用户端口数将视频业务流复制相同的 份数，以组播的方式与接收的来自数据总线的数据流一起发送至用户 终端， 否则将视频业务流作丢弃处理。
如果有多套星型总线 （如图 5 中虚线所示）， 组播分发器可通过 逻辑控制将不同视频频道的视频业务流分发至不同的星型总线。 例 如， 组播分发器将第一组播源地址的视频业务流发送至第一星型总 线， 将第二组播源地址的视频业务流发送至第二星型总线。
实施例 2:
如图 6所示，图 6示出了本发明中的视频总线采用共享型总线方 式的连接示意图，在原有主控板的数据处理模块的输出位置增加一个 共享型总线接口的组播分发器模块 100 (即相应的总线接口模块）， 该模块的输出以及各个用户接口板通过共享型总线并接，共享型总线 方式下的组播分发器模块 100 的功能是驱动单一的视频业务流透传 至共享型总线， 因为该总线是共享式的， 所以在背板上会以广播的方 式传送到每一个用户接口板；用户接口板根据组播源地址选择共享总 线广播的视频业务流， 然后复制到相应的组播用户端口。 此时的共享 型总线可以选择 Cell Bus (信元总线，一种基于定长单位的数据总线） 总线或者简化只提供发送功能的 Cell Bus, 或者选择 Utopia总线（一 种 ATM接口总线）等， 组播分发器模块是一个一出的总线接口模块， 可以选择 Cell Bus的总线接口器件，从而实现视频业务流广播到用户 接口板。在用户接口板的数据处理模块上也需要扩展提供组播视频总 线的接口， 接收视频业务流的下发， 然后复制， 并与数据业务流一起 发送至组播用户端口。
基于图 6所示的共享总线连接方式， 数据传输的过程如下： 主控板中的数据处理模块接收来自网络接口的业务流，判断所接 收的业务流是否是视频业务流， 如果是， 则输出至组播分发器， 否则 则输出至数据总线， 通过数据总线发送至用户接口板；
组播分发器收到视频业务流后，直接通过视频总线以广播的方式 发送至用户接口板的数据处理模块；
用户接口板的数据处理模块判断来自视频总线的业务流是否是 视频业务流， 如果是， 则按组播用户端口数将视频业务流复制相同的 份数，以广播的方式与接收的来自数据总线的数据流一起发送至用户 终端， 如 STB (机顶盒）、 TV (电视）、 PC (主机） 等， 否则将视频 业务流作丢弃处理。
以上两个方案的区别在于星型连接方式下用户接口板的数据处 理模块需要提供两个视频总线接口分别与主备主控板相接，而且所述 的视频数据业务在背板上需要传送多份； 而共享总线型方式下用户接 口板的数据处理模块只需要提供一个视频总线接口，而且背板上只会 传送一份广播视频数据流便可以保证各个用户接口板准确地接收相 应的视频数据业务。
如果有多套共享型总线 （如图 6 中虚线所示）， 组播分发器可通 过逻辑控制将不同视频频道的视频业务流分发至不同的共享总线。例 如， 组播分发器将第一组播源地址的视频业务流发送至第一共享总 线， 将第二组播源地址的视频业务流发送至第二共享总线。
另外， 本发明中用户接口板从用户侧接收的所有数据均通过原有的 数据总线传送给主控板。
本发明中新增的视频总线可以根据 DSLAM 组播带宽的需求选 择应用， 如选择应用信元总线或 GE总线等， 因而可以方便地进行组 播带宽的扩展， 以满足网络中不同的组播带宽的需求。
以上所述， 仅为本发明较佳的具体实施方式， 但本发明的保护范围 并不局限于此， 任何熟悉本技术领域的技术人员在本发明揭露的技术范 围内， 可轻易想到的变化或替换， 都应涵盖在本发明的保护范围之内。 因此， 本发明的保护范围应该以权利要求书的保护范围为准。

Claims

权利要求书
1、 一种实现组播带宽扩展的 DSLAM (数字用户线接入复用器）， 包括主控板、 用户接口板及数据总线， 主控板与各用户接口板间通过数 据总线相连， 其特征在于， 所述的主控板与各用户接口板间还通过用于 传输视频业务流的视频总线相连。
2、 如权利要求 1所述的 DSLAM, 其特征在于， 所述 DSLAM还 包括组播分发器， 所述主控板包括数据处理模块以及与之相连的控制模 块， 其中， 数据处理模块输出的视频业务流送至组播分发器的输入端， 所述组播分发器的输出与所述视频总线相连接。
3、 如权利要求 1或 2所述的 DSLAM, 其特征在于， 所述视频总 线为组播分发器的输出与各用户接口板的数据处理模块分别相连的点 对点星型总线， 所述组播分发器将输入的视频业务流复制后分别输出至 各用户接口板。
4、 如权利要求 1或 2所述的 DSLAM, 其特征在于， 所述视频总 线为组播分发器的输出以及各用户接口板的数据处理模块并接的共享 型总线， 所述组播分发器将输入的视频业务流通过视频总线直接广播至 各用户接口板。
5、 如权利要求 1或 2所述的 DSLAM, 其特征在于， 所述视频总 线包括一套总线或承载不同视频频道的视频业务流的多套总线。
6、 如权利要求 1或 2所述的 DSLAM, 其特征在于， 所述视频总 线为千兆以太网总线或信元总线。
7、 如权利要求 1或 2所述的 DSLAM, 其特征在于， 其特征在于 所述的视频总线为从主控板发送视频业务流到用户业务板的单向总线。
8、 一种实现组播带宽扩展的 DSLAM的数据传输方法， 其特征 在于,通过视频总线连接 DSLAM中的主控板和各用户接口板，主控板判 断来自网络接口的业务是否是视频业务流， 如果是， 则通过 DSLAM中 视频总线发送至各用户接口板， 否则， 则通过 DSLAM中原数据总线发 送至各用户接口板。
9、 如权利要求 8所述方法， 其特征在于， 所述通过 DSLAM中 视频总线发送至用户接口板的步骤包括， 由主控板中的数据处理模块向 增设的组播分发器发送视频业务流， 组播分发器将视频业务流透传至视 频总线， 并通过共享型视频总线广播至各用户接口板的数据处理模块。
10、 如权利要求 8所述的方法， 其特征在于， 所述通过 DSLAM 中视频总线发送至用户接口板的步骤包括， 由主控板中的数据处理模块 向组播分发器发送视频业务流， 组播分发器在广播发送方式下将视频业 务流按其连接的用户接口板的数目复制，在组播发送方式下根据组播配 置复制视频业务流， 然后将复制的视频业务流分别通过组播分发器与 各用户业务板相连的点对点星型总线输出至各用户接口板的数据处理 模块。
11、 如权利要求 8、 9或 10所述的方法， 其特征在于， 该方法进 一步包括， 用户接口板的数据处理模块从视频总线接收视频业务流， 并 将所述视频业务流复制到组播用户端口。
12、 如权利要求 8、 9或 10所述的方法， 其特征在于， 该方法进 一步包括， 用户接口板的数据处理模块判断从视频总线接收的业务是否 是视频业务流， 如果是， 则将所述视频业务流复制到组播用户端口， 否 则作丢弃处理。
13、 如权利要求 8、 9或 10所述的方法， 其特征在于， 该方法进 一步包括， 用户接口板从用户侧接收的所有数据均通过原有的数据总线 传送给主控板。
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