Researchers at NTT Laboratories in Japan have developed a novel technology to transmit uncompressed video streams through IP networks at rates exceeding 1 Gbps. NTT’s “i-Visto” technology, which has been field tested in cooperation with National Institute of Information and Communications Technology (NICT), transmits uncompressed HDTV signals by acquiring a path in the optical network whenever it is needed, without allocating additional network resources or re-optimizing the provisioned network resources. The experiment was carried out using GEMnet2 and JGN2plus, the R&D testbed networks provided by NTT and NICT, respectively.
Currently, data transmission exceeding 1 Gbps typically requires the network operator to allocate network resources along the transmission path. NTT Laboratories’ low-latency video transmission mechanism features an ultra-high speed server system architecture which enables the recording and playing of multiple high-quality video formats, including DVCproHD, uncompressed HD, and uncompressed 4K-resolution video.
Using GMPLS for signaling between IP routers and optical switches, the system establishes a network path for ultra-wideband video transmission dynamically whenever video transmission is activated by the user. Testing has been conducted using Experiments were done using 1920×1080 resolution images at 60 interlaced fields per second. This uncompressed video interface (HD-SDI) signal for broadcast use consumes about 1.5Gbps of network bandwidth.
