Glossary
Electra VS
- Version 05.10 601
User Manual
- Rev. A
TCP/IP
Transmission Control Protocol/Internet Protocol
Two interrelated protocols that are part of the Internet protocol suite. TCP
operates on the OSI transport layer and breaks data into packets. IP
operates on the OSI network layer and routes the packets. While IP takes
care of handling the actual delivery of the data, TCP takes care of keeping
track of the individual units of data (called packets) that a message is
divided into for efficient routing through the Internet. TCP/IP allows the
construction of very large networks with little central management.
TS
Transport Stream.
A multiplex of several Elementary Stream that are contained in packets.
UDP
User Data Protocol.
A connectionless protocol, like TCP, that runs on top of IP networks. Unlike
TCP/IP, UDP/IP provides very few error recovery services, offering instead
a direct way to send and receive datagrams over an IP network without
acknowledgements for guaranteed delivery.
Unicast
Unicast is communication between a single sender and a single receiver
over a network.
UTC
Coordinated Universal Time.
UTC is the time standard by which the world regulates clocks and time. In
casual use, UTC corresponds to Greenwich Mean Time (or GMT).
VBI
Vertical Blanking Interval.
In analog video, the interval after the last displayed line of video in a field
and before the first displayed line of video in the next field, during which
a television receiver will synchronize vertically.
VBR
Variable Bit-Rate.
VBR
is an encoding method that is designed to achieve a better video
quality vs. bitrate ratio than CBR (Constant Bit-Rate) encoding. This is
achieved by continuously changing the bit rate during the encoding
process depending on the picture complexity. Refer to
Statmux
.
VBV
Video Buffering Verifier
The video buffering verifier is a theoretical MPEG video buffer model used
to ensure that an encoded video stream can be correctly buffered and
played back at the decoder device.
VGA
Video Graphics Array (640x480 pixels).
VLAN
Virtual Local Area Network.
A local area network with a definition that maps workstations on some
other basis than geographic location (for example, by department, type of
user, or primary application). The virtual LAN controller can change or add
workstations and manage load balancing and bandwidth allocation more
easily than with a physical picture of the LAN. Network Management
System software keeps track of relating the virtual picture of the local area
network with the actual physical picture. VLANs are based on logical
instead of physical connections.
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