User's Manual

11.5 E
EEPROM
Electrically Erasable, Programmable Read Only Memory:
Nonvolatile memory, it must be removed from board to be erased.
EIRP
Effective I sotropically Radiated Power. EI RP is the amount of
power transmitted to the air by the antenna. EIRP levels depend
on the power of the radio transmitter, the type of antenna, and
the losses incurred in the antenna cable.
ERP
Effective Radiated Power. The power radiating from an antenna
taking into account the output power from the transmitter plus the
antenna gain, less connector and cable losses.
ESD
Electrostatic Discharge. Caused by static electricity. ESD Protection
should be used to protect electronic components from damage.
11.6 F
Fade Margin
The amount by which the system gain plus the total antenna gain
exceed the path loss is called the fade margin. The fade margin is
the number of dB that the received signal strength exceeds the
minimum receiver sensitivity.
FEC
Forward Error Correction. A method of correcting data errors
without retransmission.
Filtering
Filtering in remote stations limits certain data packets.
Flash
A type of electrically erasable non-volatile memory that can easily
be erased without removal from a unit. Using Flash, the Access
Point can be upgraded in the field.
Fresnel Zone
The line of sight between two antennas. It consists of one of a
theoretically infinite number of a concentric ellipsoids of revolution
that define volumes in the radiation pattern of a usually circular
aperture. The cross glossdiv of the first Fresnel zone is circular.
Subsequent Fresnel zones are annular in cross-glossdiv, and
concentric with the first. Odd-numbered Fresnel zones have
relatively intense field strengths and even-numbered Fresnel zones
are nulls. Fresnel zones result from diffraction by the circular
aperture.
Front to Back
Ratio (F/B)
Directional antennas focus the signal in a forward path, reducing
the signal in the opposite direction. The proportion between the
two is called the front-to-back ratio. A higher gain antenna
typically has a greater F/ B ratio.
Frost Loading
A concern of antenna operation affected by low temperatures.
FTP
File Transfer Protocol. A method of copying files from one site to
another. An operator of EI ON equipment might use ftp to
download software upgrades.
LibraPlus 5860 User Guide Appendix B: Def initions: E Page 82 of 95