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Appendixes
IP-900 Series
125
PMT (Program Map Table)
ID table which identifies audio, video, and so
on.
PPPoE (Point to Point Protocol over
Ethernet)
PPPoE is a specification for connecting the
users on an Ethernet to the Internet. PPPoE
supports authentication and enables a
point-to-point connection to be established in
the normally multipoint architecture of Ethernet.
PPS (Picture Parameter Set)
A header in NAL (Network Abstraction Layer) of
H.264/AVC, which information on the whole
picture encoding is described.
Private PES
Packetized elementary stream standardized
by MPEG2 System that user can use arbitrarily
for data transmission.
Pre-Filter
Filter that works before encoding video signal
for an improvement of video quality with violent
movement at low encoding rate.
Profile
This defines various encoding formats used for
compressing the image. Profile can be changed
depending on the use of the compressed image.
Program Number/Service ID
ID for identifying a channel (service) provided
by a broadcasting company. By specifying a
program number/service ID, you can select an
arbitrary transport stream from multiple
transport streams.
Pro-MPEG FEC
FEC method standardized at Pro-MPEG
Forum (Professional-MPEG Forum). Redundant
packet consists of 2 dimensions (columns x
rows) are sent for this method.
Proxy
A computer network service that allows clients
to make indirect network connections to other
network services.
PS (Program Stream)
An MPEG-2 method for multiplexing video,
audio, and data, the PS method is used for
transmission and storage in an error-free
environment.
PSI (Program Specific Information)
This is the information which program each ES
in TS packet belongs (e.g., PAT, PMT, and CAT.)
QPSK, 8PSK (Quadrature Phase Shift
Keying, 8 Phase Shift Keying)
PSK is a modulation system that expresses
information using a combination of multiple
carrier waves with a phase shift between them.
The system that uses 4 waves with phase-shifts
separated by an angle of 90 degrees is called
QPSK. Each modulated signal (one symbol) can
transmit two bits of data. The system that uses
eight waves with phase-shifts separated by an
angle of 45 degrees is called 8PSK. Each
modulated signal (one symbol) can transmit
three bits of data.
Refresh Cycle
Frame cycle between I frames for Quality
(IBBP) and Motion (IBP) of Encoding control
mode. Frame cycle of updating one screen
image by using intra-slice for Low Latency
(PPPP) of Encoding control mode.
Roll-off Factor
Another name for roll-off rate. The factor for
the processing of spectrum forming for
transmission data is called the roll-off factor.
The purpose of the processing is to increase the
frequency usage rate while suppressing
interference in the carrier. Generally, a larger
factor increases interference in the carrier but
also increases resistance to selective phasing.