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Appendix D • Glossary of Terms
pixels and a refresh rate of 30 frames per second. Note that
MPEG-1 allows resolutions up to 4095 x 4095 active pixels;
however, there is a "constrained subset" of parameters defined
as SIF. The computer industry, which uses square pixels, has
defined SIF to be 320 x 240 active pixels, with a refresh rate of
whatever the computer is capable of supporting.
SMPTE time code – A standard for a signal being recorded to
uniquely identify each frame of the video signal. It is used to
control editing operations. (SMPTE stands for Society of
Motion Picture and Television Engineering).
Stream – The flow of data as a sequence of bits. It is also
referred to as bit stream.
Sub-carrier – A high-frequency carrier in a composite color
TV system, on which the chrominance information modulates
before combining with the luminance signal.
Subnet Mask – An extension of the IP addressing scheme that
allows a site to use a single IP network address for multiple
physical networks.
S-Video – A video signal that carries separate luminance and
chrominance signals.
Switch – In telecommunications, a switch is a network device
that selects a path or circuit for sending a unit of data to its next
destination. A switch may also include the function of the
router, a device or program that can determine the route and
specifically what adjacent network point the data should be sent
to. In general, a switch is a simpler and faster mechanism than a
router, which requires knowledge about the network and how to
determine the route
TCP – Refers to the Transport Control Protocol, used along
with the Internet Protocol (IP) to send data divided into data
packets over the Internet. While IP handles the actual delivery
of the data, TCP keeps track of the individual data packets for
efficiently routing data through the Internet.
Telnet – The TCP/IP standard protocol for remote terminal
service. TELNET allows a user at one site to interact with a
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