DTV 720 USER’S MANUAL
800043-01 Rev. C 6 www.wegener.com
PAT Program Allocation Table. Master table which identifies all the Programs in
the Transport Stream. It associates Program numbers to the PIDs bearing
the associated Program’s PMT.
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 constituent data stream within the Transport Stream. Also, in this doc-
ument, “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 vari-
ables, state information, and messages are stored. RAM is also used to
designate the volatile storage used by the Transport Demux and decom-
pression devices.
RF Radio frequency
TMRA Maximum Recommended Ambient Temperature, the highest operating tem-
perature for which the unit is rated
Transport Stream
(or MPEG Transport
Stream)
A multiplex of several data streams, each of which is borne in Transport
packets, 188-byte blocks containing a sync word, header information
(including a PID), and payload 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 DTV 720
Table 1.2: Glossary of Terms
Term Definition
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