Harmonic ProView 7000 - Page 216

Glossary
Numerics  A B C  D E F G H I J L M N O P 
Q R S T U V W Y 
© 2011 Harmonic Inc. 216 ProView 7000 v.2.4, Rev. A
PAT
Program Association Table. This table indicates the location (the PID values of the transport
stream packets) of the corresponding Program Map Table (
PMT ), as well as the location of the
Network Information Table (
NIT ).
path
For a network system, the route down a menu hierarchy to a specific submenu, menu option, or
parameter. The visual display shows each submenu as two or more letters plus a colon to
represent a path.
PCR
Program Clock Reference. This is a field defined by MPEG-2 Systems, which carries a sample of
the encoder’s 27-MHz reference clock. The PCR values are periodically inserted into the
Transport Stream, and used by the decoder to reconstruct the clock and maintain synchronization
with the encoder.
PDU
Protocol Data Unit. A data unit that is specified in a layered protocol that consists of protocol
control information and layer user data.
pel
Picture Element — also known as a pixel.
PER
Packet Error Rate.
PiP
Picture in Picture.
PES
Packetized Elementary Stream. The MPEG-2 data structure used to carry elementary streams
over physical media. The PES packet payload consists of data from a single elementary stream.
physical address
See MAC address .
PID
Packet Identifier. Integer values used in the MPEG-2 Systems standard to identify each
elementary stream within a program within a transport stream.
pinout
The description and purpose of each pin in a connector.
PMT
Program Map Table. An MPEG-2 Program Specific Information ( PSI ) table that maps the PID
values to each elementary stream (and stream type) that comprises the
program .