Harmonic ProView 7000 - Page 226

Glossary
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© 2011 Harmonic Inc. 226 ProView 7000 v.2.4, Rev. A
transport
In NMX, a transport is a submap that exists within the main submap. It contains a collection of
components and external devices as well as channels and circuits. The function of a transport is to
contain a collection of Harmonic components, input devices, output devices, and links, and to
provide access to the programs and circuits associated with that transport.
Transport Stream
One or more multiplexed compressed programs, typically containing video, audio, and associated
data. Defined by MPEG-2 Systems (ISO/IEC 13818-1), it can transport a wide variety of video
and audio compression formats.
TS
Abbreviation for Transport Stream, defined by MPEG-2 Systems (ISO/IEC 13818-1)
TS packet
MPEG-2 Transport Stream packet. The basic unit of an MPEG-2 Transport Stream . Each packet
is 188 bytes, which includes a 4-byte header.
U
UDP
User Datagram Protocol. A connectionless protocol that relies on IP transport. Unlike TCP/IP,
UDP/IP provides no error recovery services, offering instead a faster way to send and receive
datagrams over an IP network.
UDP port
User Datagram Protocol used with GbE interface.
unbalanced audio
Audio that has a single output with respect to ground; that is, the output is not transmitted
differentially. See also
balanced audio .
UNI
ATM user-network interface. The logical demarcation point between service users’ equipment
and network providers’ equipment.
Uploading configuration
Sending the configuration to the device.
upstream
Refers to the direction of the communications service flow. The return communications path
traverses upstream from the subscriber to the service provider.
URI
Uniform Resource Identifier.