User's Manual

SPEEDLAN 9000 Series Installation and Operation User Guide
Glossary-13
Part 15 (of FCC rules)
The section of the FCC Code of Federal Regulations defines the restrictions regarding the use of Spread Spectrum systems.
Passive Repeater
A re-radiation device associated with a transmitting/receiving antenna system that re-directs intercepted radio frequency
energy without boosting or processing the signal.
Path Length
The distance between two ends of a wireless system.
Path Loss
The decrease in signal power experienced when a signal is transmitted between two points.
Path Profile
A drawing of the terrain (including buildings, trees, hills, lakes, etc.) along a transmission path to determine if a given path
is viable for the communication link. This is usually done with a computer.
Personal Communication Services (PCS)
A lower powered, higher frequency competitive technology to cellular.
Polarization
The direction of the amplitude of a radio wave. Polarization is usually horizontal or vertical.
Pole Height
This is the height of the antenna supporting structure.
Power Output
The power produced by a transmitter. This is measured in decibels per meter (dBm).
Processing Gain
The ability of the spread spectrum decoder to recover the received signal out of noise. It is essentially the increase in abil-
ity to recover the signal in the presence of an interfering carrier of the same or greater level.
Propagation
The transmission of a wave along a given path through a medium.