Triple-Play Service Deployment

Glossary
Packet See Transport Packet
PAL Phase Alternating Line
PAP Password Authentication Protocol
PAT Program Association Table.An MPEG-2 table that lists all the programs contained in
the transport stream and shows the PID value for the PMT associated with each
program.The PAT is always found on PID 0x0000.
Patchcord A cable permanently assembled at both ends with connector components
principally for cross-connection within a patching facility.
Payload All of the bytes in a packet that follow the packet header.
PCR Program Clock Reference. A time stamp in the MPEG-2 transport stream that sets
the timing in the decoder.The PCR is transmitted at least every 0.1 seconds
PES Packetized Elementary Stream. This type of stream contains packets of undefined
length. These packets may be comprised of video or audio data packets and
ancillary data
PES Packet In MPEG-2, the structure used to carry elementary stream data (audio and video).
It consists of a header and a payload.
PES Packet Header The leading bytes of a PES packet, which contain ancillary data for the elementary
stream.
P-frame In MPEG-2 the Predicted frame, or a picture coded using references to the nearest
previous I- or P- picture.
Physical Layer Handles transmission of raw bits over a communication channel.The physical layer
deals with mechanical, electrical, and procedural interfaces.
PID In MPEG technology, the Packet Identifier. This unique integer value identifies
elements in the transport stream such as tables, data, or the audio for a specific
program.
Pigtail A short length of optical fiber permanently attached to a connector and intended
to facilitate jointing between that connector and another optical fiber or
component
PLL Phase Lock Loop. This locks the decoder clock to the original system clock through
the PCR.
PMS-TC Physical Media Specific -Transmission Convergence
PMT Program Map Table. An MPEG-2 table that specifies PID values for components of
programs. It also references the packets that contain the PCR.
POTS Plain Old Telephone Service; one of the services using the voice band; sometimes
used as a descriptor for all voice band services.
PPP Point-To-Point-Protocol. The successor to SLIP, PPP provides router-to-router and
host-to-network connections over both synchronous and asynchronous circuits.
PSD Power Spectral Density
285