User's Manual

Ping A method of testing a link. Executing the ping command sends a
signal to the remote station. The station returns the signal. I f the
signal comes back on time and intact, the link works. See Also
FTP.
Polarization The orientation of the radiating element of an antenna with
respect to Earth. The polarization of antennas is usually described
as vertical, horizontal, or circular.
PN Pseudo-random noise. A code used to change a narrowband signal
into a spread spectrum signal.
Point-to-
Multipoint
A wireless system with one base unit communicating with many
remote units. I n the BWS system, the AP is the base and the CPEs
the remotes.
Point-to-Point The simplest wireless system, consisting of a base and a remote.
Polling The AP unit handles multiple CPEs by contacting them in the order
they appear in the polling list. When an AP polls a CPE, they
exchange data. The CPE cannot exchange information with the AP
until it is polled again.
Polling List The order in which the AP contacts the CPEs in its sector.
Propagation
Loss
The weakening of a signal as it travels through the air. Expressed
in dB.
11.14 Q
QAM Quadrature Amplitude Modulation. A kind of modulation that varies
signal amplitude.
11.15 R
Reed-Solomon A way of accomplishing Forward Error Correction. Reed-Solomon
describes a data block in such a way that errors in the data block
can be detected and repaired without retransmission.
Remote Unit A unit that can communicate with a base station or other remote
units. A remote unit forms a wireless link between a network
segment and a base station. CPEs are the remote units in the BWS
system.
RF Radio Frequency. RF communication uses electromagnetic waves
propagated through space. Because of varying characteristics,
radio waves of different lengths are used for different purposes
and are usually identified by their frequency.
RF Center
Frequencies
EI ON Broadband Wireless Access Systems sometimes use two
center frequencies. The AP transmits on one and the CPEs transmit
on another.
LibraPlus 5860 User Guide Appendix B: Definitions: Q Page 86 of 95