CMN-91
Appendix C
Installation and Operation Manual
Glossary
© 2016 Imagine Communications Corp. Proprietary and Confidential.
Revision D | Page 188
Pollution Degree 3 describes conditions where conductive pollution occurs, or dry, nonconductive
pollution occurs due to condensation. Rooms that cannot maintain the moisture or temperature fall
into this category. The location can only protect from outside weather conditions such as direct
sunlight, rain, snow, and wind. Industrial areas can fall under Pollution Degree 3.
Pollution Degree 4 describes pollution that generates persistent conductivity through conductive
dust, rain, or snow. Pollution Degree 4 is for outdoor locations.
PPS Pulse-Per-Second
Preset Refers to establishing any condition prior to use on the Program output. This term is used in
reference to wipe patterns and is often interchanged with Preview.
Preview The video output channel used to view the intended Program results prior to the execution of
the next transition.
PRO Audio A transmitted audio channel for talent cueing via Interrupt Foldback (IFB) to ENG vans and
remote applications. Some demodulators support PRO audio monitoring.
Prog (Program) Refers to a single 'TV Channel' or 'Program' contained within a source that can be
referenced by either number or combination of number and name.
Program A transport stream combination of a video stream and one or more audio and data streams
associated with that video stream. In analog terms, "Program" refers to the Base Band video and audio
produced by the final output of a switcher.A program nominally has a video essence and one or more
audio essences synchronized with the video with dedicated clocking. It may also have associated data,
synchronized or unsynchronized with the audio and video. Other products may substitute the word
“Flow” for the word “Program.”
Program Association Table (PAT) A list of all programs that are in the ATSC data stream.
Program Map Table (PMT) A listing of all elementary streams that comprise a complete (television)
program.
Program Clock Reference (PCR) A time reference signal that is placed in MPEG streams for the purpose
of time coordinating various data streams.
Program and System Information Protocol (PSIP) Information sent out as part of an ATSC transport
stream which lists all of the video, audio, data and program information contained in the stream. This is
the "TV guide" for a given stream.
Program Number or ProgNum Refers to the program_number signalled in the PAT; can also be set to
index or port for non-Transport Stream sources.
Program Name or ProgName Refers to the name assigned to a 'Program'. This is used to represent the
name of the ‘TV channel’ and is set to one of the following by priority (highest first):
1. Signaled Service Name (from SDT for example)
2. User set Custom Name
3. ‘N/A’ or empty if above not available.