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本文介绍了DOCSIS标准内容,分析了DOCSIS标准为满足不断发展的业务需求变化而从1.0到3.0的发展过程,详细介绍了DOCSIS3.0技术的系统结构和各接口的定义.并分析了DOCSIS3.0进一步的发展方向. 相似文献
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浅析DOCSIS标准及其演进 总被引:1,自引:0,他引:1
本文介绍了DOCSIS标准发展的历程。标准的逻辑组成及结构和DOCSIS标准对HFC网络的性能要求。对DOCSIS系列标准的技术特点进行了阐述,指出DOCSIS标准的演进对于有线电视网络发展双向宽带数据业务具有极其重要的意义。 相似文献
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当前,DOCSIS2.0已经普遍得到了应用,DOCSIS3.0的标准也已出台。DOCSIS2.0标准规定了上行带宽每频道可达30Mb/s。DOCSIS3.0标准规定了频道绑定技术,通过4个频道绑定下行带宽可达160Mb/s,而上行带宽可达120Mb/s。 相似文献
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HFC宽带接入网络技术得以成熟应用,第二代有线电视网络传输数据的技术规范DOCSIS2.0已正式获得批准成为国际标准。将DOCSIS2.0与DOCSIS1.0/1.1技术标准进行对比分析,着重分析DOCSIS2.0的性能特点,并对两标准实际应用的效果进行对比介绍。 相似文献
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DOCSIS3.0的基本功能与引入之好处 总被引:1,自引:0,他引:1
据日刊“卫星与CATV 08-01”期报道:采用新DOCSIS Modem标准DOCSIS3.0,由于可以直接利用现在CATV业界的HFC设备,目前正进行宽带IP的传送尝试。如果这一技术得以实用化,就可以不必把现有的(HFC)网络改成FTTH(光纤到户),也能向用户提供高于100Mbps的高速因特网业务。报道称:到今年春夏相交之际,日本的DOCSIS3.0产品即可上市。 相似文献
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1引言随着有线电视数据业务的发展,DOCSIS2.0标准在部署及运营中已经逐渐不能满足运营商业务发展的需要,DOCSIS3.0解决了这些问题,这一新标准能够在降低建设成本的前提下,提供更高的带宽、更优的质量及多业务提供能力。 相似文献
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一前言
基于DVB技术的数字电视业务和基于DOCSIS标准的宽带数据业务在有线电视HFC网络中的发展已趋于成熟,双向互动业务将成为未来有线电视业务发展的趋势,其中语音业务、视频通信、智真会议等通讯类业务将成为有线电视业务新的尝试与业务增长点. 相似文献
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DOCSIS3.1标准逐步从标准制定走向规模化部署阶段,而网络性能的优化和网络的主动维护功能还有很大的提升空间,本文重点介绍了可变bit-loading的Profile管理功能,并针对Profile管理出现的一些问题,提出了一种新的单播Profile管理方法;同时介绍了DOCSIS3.1PNM运维功能,并分析了新功能面临的挑战以及走向智能运维的转型方向。 相似文献
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Anwar A. Elfeitori Hussein Alnuweiri 《Wireless Communications and Mobile Computing》2005,5(2):139-152
We propose a novel and cost‐effective approach for the deployment of third generation (3G) wireless systems over hybrid fiber coaxial (HFC) CATV networks. The main goal is to facilitate 3G deployment over the existing CATV plant and reduce the large cost required for building a dedicated last mile infrastructure for 3G access networks. Our proposal reduces the last mile cost by sharing the existing CATV network and using the standard equipment and protocols of data‐over‐cable systems interface specifications (DOCSIS). This allows rapid deployment of 3G wireless systems, facilitates convergence of wireless and wireline networks and paves the way towards all IP wireless networks. Enhancements to the DOCSIS medium access control (MAC) protocol must be implemented in order to support Quality of Service (QoS) guarantees for 3G data and signaling traffic. This paper presents the proposed 3G over CATV network architecture and DOCSIS medium access control (MAC) enhancements for enabling the support of QoS guarantees for 3G data and signaling traffic. The proposed MAC enhancements can reduce the access delay for delay‐sensitive traffic by 30 to 40% over existing DOCSIS MAC without compromising QoS guarantees for other traffic classes, or the DOCSIS channel utilization. Copyright © 2004 John Wiley & Sons, Ltd. 相似文献
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在有线电视网络标准中,DOCSIS提出了优先权的思想和许多保障机制,利用给与不同Cable Modem(CM)不同的优先权,保证那些等级较高的使用者可以得到较高的传输效能.这里探讨了DOCSIS1.1对QoS的支持,提出了一个在CM频道配置过程中加入优先权机制的方法,利用两个机制来确保有线电视网络的所有CM能得到一个最佳的分布,首先利用一个更改后的频道分配机制来确保CM能得到最佳的分布,而当频道的状况由于CM数量或流量的改变而产生变化时,便利用另一个频道平衡机制,来平衡各频道的流量和各频道中CM的数量. 相似文献
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Over the past two decades, cable television has largely supplanted over-the-air broadcast as a TV distribution medium. Several years ago, enterprising companies concluded that they could leverage the extremely wide bandwidth of cable TV systems required to deliver broadcast-quality television as a high-speed conduit for broadband data communications. This led to the birth of the cable modem. Early cable-modem equipment was vendor proprietary, so interoperability between different vendors' products was largely nonexistent. To promote interoperability, Cable Labs (the cable TV industry research arm) developed the Data Over Cable Service Interface Specification (DOCSIS 1.0), an IP-centric, point-to-multipoint standard that quickly replaced the proprietary solutions that preceded it. DOCSIS has now become the accepted cable standard. The newly released DOCSIS 1.1 is destined to play an important role in the delivery of high-quality multimedia across fixed wireless communications networks. With this approach, we can take advantage of all the DOCSIS technology modules that exist in the market today, allowing the wireless platform to migrate toward emerging services such as Internet protocol multicasting and voice over IP (VoIP). We describe the state of current technologies that have made fixed-wireless access a viable and compelling choice. We also discuss some emerging technologies that will bring exciting new fixed-wireless services and capabilities into homes and small businesses in the near future 相似文献
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DOCSIS协议已经成为HFC网络上传输IP数据事实上的全球标准,以DOCSIS协议为基础并充分考虑到用户的优先级水平,提出一种交互式视频点播(I-VOD)的实现原理,为VOD业务和宽带Ca-ble Modem业务的融合提供了一种思路。 相似文献
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随着信息技术的不断发展,三网融合已成为全球公认的未来信息通信的发展方向。由于行业的垄断,三网融合至今尚未完成。阐述我国的3种网络的特点以及DOCSIS3.0技术,分析DOCSIS3.0在三网融合中的技术优势。 相似文献
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This study comprehensively reviews two HFC MAC protocols: Data-Over-Cable Service Interface Specifications (DOCSIS) and IEEE 802.14a. DOCSIS was approved by the ITU as a standard and is supported by many vendors. However, IEEE 802.14a remains a draft due to the delayed standardization process. After briefly introducing the features of HFC networks, the basic operations and mechanisms of these two MAC protocols are then examined. Both standards view an upstream channel as a stream of minislots and have similar mechanisms for upstream bandwidth management, virtual queue, downstream in MPEG-2 format, data-linklayer security, and ranging. However, the standards adopt different mechanisms for upstream access modes, QoS support, and collision resolution. Moreover, the implementation issues over hardware and software design for DOCSIS networks are investigated. This work also identifies the research issues in HFC MAC protocols, particularly allocation and scheduling issues. 相似文献