有首歌在豪华轿车总是让我微笑。这首名为《互联网杀死了视频明星》(Internet Killed the Video Star)的歌曲是对1979年Buggles乐队的歌曲《视频杀死了广播明星》(Video Killed the Radio Star)的一种半开玩笑的引用，这首歌是MTV上第一个音乐视频。
有首歌在豪华轿车总是让我微笑。这首名为《互联网杀死了视频明星》(Internet Killed the Video Star)的歌曲是对1979年Buggles乐队的歌曲《视频杀死了广播明星》(Video Killed the Radio Star)的一种半开玩笑的引用，这首歌是MTV上第一个音乐视频。有趣的部分?互联网远没有扼杀这位视频明星，它对视频的贡献可能比其他任何媒体都要大。根据Nemertes Research最近发布的2010/2011年度基准研究报告，目前超过80%的公司依靠基于ip的视频会议进行协作，并希望将这种能力扩展到组织范围之外。与此同时，令人惊讶的是，50%的人表示他们计划在明年推出流媒体视频。供应商和服务提供商正在注意到这一点。会话边界控制供应商Acme Packet最近宣布与Glowpoint结成伙伴关系，以实现安全的企业对企业会议。Global Crossing最近收购了Genesis Networks，后者运营着一个基于ip的全球视频分销网络。根据这些趋势，网络管理人员需要重新考虑他们的广域网战略。交互式和流式视频都具有高带宽的特点，可以使典型的分支办公室连接需求增加一倍或三倍。此外，交互式视频对延迟和抖动非常敏感，对丢失也非常敏感。这意味着，除了提前计划增加容量之外，网络管理人员还需要认真考虑制定应用程序交付优化(ADO)策略。ADO是什么? In a nutshell, it's architecting to ensure appropriate, effective delivery of critical applications (including video) to distributed and mobile users. Effective ADO encompasses application availability and performance as well as security, WAN optimization, and management and monitoring. Products and services that enable ADO include application delivery controllers, WAN optimization devices, QoS and overlay networks. On the WAN, the most typical ADO models are to have appliances at one (asymmetric) or both (symmetric) ends of the connection to improve traffic flow through some combination of compression and caching, acceleration, traffic conditioning (to mitigate packet loss, for example) and traffic shaping (prioritization). Vendors with appliances that enable ADO on the WAN include Blue Coat, Cisco, Citrix, Exinda, Ipanema, Juniper and Riverbed. Increasingly, virtual appliances are available, too, for example from Blue Coat, Certeon and Citrix. Carriers can offer QoS and other flavors of optimization in their service clouds, including protocol acceleration, latency mitigation and finer-grain traffic shaping than QoS allows. (Virtela has been an early mover with a pure in-the-cloud optimization offering, recently joined by newcomers Pareto and Aryaka.). Finally, overlay networks -- such as the ones provided by InterNap, Akamai, and Limelight -- can help deliver IP video.Technology isn't the only thing that has to change. ADO lies at the convergence of several heretofore discrete IT architectures, including security, application design, network infrastructure, mobility and unified communications. This means that IT professionals need to rethink how the teams responsible for these architectures will collaborate to ensure effective application delivery.The bottom line: As IP connectivity becomes ubiquitous, video over IP (both interactive and streaming) is here to stay. Network managers need to design, engineer and organize accordingly. After all, as the song goes: "We can't rewind, we've gone too far."