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NTT Develops Linux-Based System to Deliver Real-Time HDTV Video Over the Internet

TOKYO-Oct. 29, 2001–Nippon Telegraph and Telephone Corporation(NTT) has successfully developed the world’s first system fordelivering 1.5 Gbps volume uncompressed HDTV video data in real timeover the Internet. NTT will exhibit the Linux-based system during theInternational Broadcast Equipment Exhibition (InterBEE 2001) at theNippon Convention Center from November 14 to 16, 2001.

The system, developed by NTT Network Innovation Laboratories, usesPCs with HDTV interfaces and super-high-speed network interfaces. Thesystem was deployed in Tokyo between the NTT Musashino R&D Centerand the University of Electro-Communications. HDTV images weretransmitted over an IP Internet connection using a 2.4-Gbps fiber-opticline.

The processing capacity of a 1.5-Gbps uncompressed HDTV video datastream can support up to 70 HDTV-quality MPEG-2 streams (22 Mbps perstream) or 150 to 300 DVD-quality streams (5-10 Mbps per stream).

Low-Cost Implementation

The system consists of commercially available PCs and HDTVinterfaces, running on Linux. A number of speed enhancement techniqueswere applied to the operating system and the application program tosupport Gbps-class streaming data, including optimizing the internalbus scheduling and memory access, and parallel processing usingmultiple processors. The system will eventually be capable ofmanipulating the processing of video contents.

NTT Network Innovation Laboratories are continuing to assess theprotocol processing of Gbps-class streaming data over the trial system,while at the same time exploring the applicability of the system tocaches, servers, and mirror sites with the ultimate aim of buildinglarge-capacity streaming content delivery networks.

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