HP ProLiant 1600 Video Streaming Technology - Page 18

ECG068/0798 WHITE PAPER (cont.) 1...8 The Ethernet switching hub only routes video packets that are addressed to the specific client devices on the appropriate output ports. This keeps video traffic flowing smoothly to the desktops that need it, and insulates the corporate backbone network from high bandwidth video. This establishment of dedicated "subnets" prevents conflicts between video and other data, and also prevents video from hogging shared network bandwidth. Switched Ethernet is often recommended for high-quality video to the desktop as it can often use most of the existing network infrastructure such as Network Interface Cards (NICs), hubs, and cabling. Fast Ethernet: Fast Ethernet generally refers to high speed Ethernet such as 100BaseT which supports 100Mbps bandwidth-a tenfold increase over 10Mbps 10BaseT. Fast Ethernet works the same from a protocol and access point of view as standard Ethernet, only faster. The higher bandwidth provides better support for streaming video. Many enterprises install Fast Ethernet as an upgrade or as a network backbone. The next generation of Fast Ethernet-Gigabit Ethernet-is in development. ATM: Asynchronous Transfer Mode uses hardware switching to provide not only high speed-25Mbps to 2.5Gbps-but it also a guaranteed Quality of Service (QoS) and multicasting through a circuitswitched connection. It uses fixed 53 byte packets and was designed from the outset for multimedia data transmission such as video, sound, and images. Physical media includes twisted pair, coax, and fiber. Because of its speed and expense, it was originally used for wide-area longhaul networks, but is now beginning to be deployed as a local area backbone. Public Internet The public Internet is moving at a breathtaking pace in terms of content, access, and subscribers. There is a strong motivation to be able to deliver video content for a number of potential applications including webcasting, product advertising and catalogs, interactive shopping, and virtual travel. Access Access to the public Internet is generally done through an "access network" that connects to the "core network" or backbone of the Internet. Web Server Video Server HTTP Core Network Access Network UDP TCP HTTP (Tunnel) New Protocols: RTP RTSP RSVP IPv6 Access Methods: Modem, ISDN, ADSL, Cable modem Internet Access to Video Client