ADTRAN IPR-S1000 manual Pstn

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.