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DTV 701 User's Manual
Term
PCR
Program Clock Reference. Time-base signal used to synchronize transport stream data.
PID
Packet Identifier. The unique Transport Stream packet identifier assigned to each con-
stituent data stream within the Transport Stream. Also, in this document, "PID" is used
to designate the stream itself.
PMT
Program Map Table. Table for a given Program identifying all the PIDs for its PCR,
video, audio, and user data streams.
Program
In the MPEG hierarchy, a grouping of related audio, video, or generic data PIDs sharing
a common PCR time base and (usually) sharing a common schedule. See PMT.
PSI Tables
Program-Specific Information Tables. A group of information-bearing tables, each
borne by well-known PIDs, regularly transmitted in the Transport Stream. See also
"PAT" and "PMT". Also, ISO 13818-1 gives a thorough description of these and other
Tables.
PSIP
Program and System Information Protocol - a method for transporting digital television
system information and electronic program guide data.
RAM
Random access memory. A general term for all memory volatile memory types out of
which application software executes and into which its variables, state information, and
messages are stored. RAM is also used to designate the volatile storage used by the
Transport Demux and decompression devices.
RF
Radio frequency
TMRA
Maximum Recommended Ambient Temperature, the highest operating temperature for
which the unit is rated
Transport Stream
A multiplex of several data streams, each of which is borne in Transport packets, 188-
(or MPEG Trans-
byte blocks containing a sync word, header information (including a PID), and payload
port Stream)
data. This multiplex includes PSI data tables, Programs, and padding in the form of null
packets.
Warning
A condition or notification of a condition that may compromise the proper performance
of your DTV701.
wegener.com
Table 2: Glossary of Terms
Definition
11
800015-01 Rev. D
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