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Glossary

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N

NTSC

Short for National Television Standards Committee. The NTSC is responsible for setting television and video standards in the United States (in Europe and other parts of the world, the dominant television standards are PAL and SECAM). The NTSC standard for television defines a composite video signal with a refresh rate of 60 fields (half frames interlaced) per second. Each frame contains 525 lines and can contain 16 million different colors. The resolution of an NTSC VCD is 352x240 pixels, an NTSC SVCD is 480x480, and an NTSC full D1 DVD is 704 or 720 x 480.

NVOD

Short for Near Video On Demand. Systems that deliver programming at a time acceptable to the consumer, although not instantaneous, accomplished by repeating the same programs on several channels simultaneously at frequent intervals, e.g. every 15 or 30 minutes.

Non-repudiation

Preventing the denial of previous commitments or actions.

NSA

Short for National Security Agency, US security resource for military
purposes.

Network address

The combination of IP address and port.

NIST

Short for National Institute of Standards and Technology, a federal agency within the US Commerce Department's Technology Administration. See www.nist.gov

NIT

Short for Network Information Table. The NIT is used to transmit technical information about the delivery network, which could be a satellite network, a cable network or a terrestrial network.