IPricot IPR-S1000 - Manual (Page 105)

PLL
Phase Locked Loop. A type of oscillator that uses digital circuits and a precision
reference signal to accurately control the frequency of the conversion oscillator. An
LNB that incorporates a PLL oscillator has the characteristics of very low levels of
phase noise and high levels of frequency stability.
Plug and Play
Also known as PnP, it is an Intel standard for the design of PC expansion boards that
the IRQ and DMA settings and I/O and memory addresses self-configure on startup.
Polarization
A technique used by the satellite designer to increase the capacity of the satellite
transmission channels by reusing the satellite transponder frequencies. In linear
crosspolarization schemes, half of the transponders beam their signals to earth in a
vertically polarized mode, the other half horizontally polarize their down links.
Although the two sets of frequencies overlap, they are 90 degree out of phase, and will
not interfere with each other. To successfully receive and decode these signals on
earth, the earth station must be outfitted with a properly polarized feedhom to select the
vertically or horizontally polarized signals as designed.
PPP
Point-To-Point Protocol. A data link protocol that provides dialup access over serial
lines by encapsulating protocols in specialized Network Control Protocol packets.
These packets can be used to replace a network adapter driver which allows remote
users can log on to the network as if they were in-house (see RFC 1661).
Profile
A set of parameter values that can be defined and stored. IPRS Profiles can be
downloaded using TFTP. Profiles are saved in a dotlink.cfg file).
PSK
Phase-Shift Keying. A phase-modulation technique in which phase shifts represents
signaling elements.
PSTN
Public Switched Telephone Network. The worldwide voice telephone network.
QAM
Quadrature Amplitude Modulation. A modulation technique that generates four bits
out of one baud.
QPSK
Quadrature Phase Shift Keying. QPSK is a digital frequency modulation technique
used for sending data over coaxial cable networks. Since it is both easy to implement
and fairly resistent to noise, QPSK is used primarily for sending data from the cable
subscriber upstream to the Internet.
Reboot
Allows you to restart IPr-S.
Receiver
A part of reception equipment used to tune into a single channel broadcast from a
satellite.