User Manual

SPEEDLAN 9000 Series Installation and Operation User Guide Version 3.03
Glossary-11
KHz (KiloHertz)
Thousands of Hertz. Each wireless phone call occupies only a few KiloHertz.
LAN
This is a local area network that enables computers, network equipment, or other peripherals to
communicate on a small network.
Last mile
Any type of telecommunications technology where data (voice, video, etc.) is traveled within relatively short
distances to maintain to highest quality of bandwidth and throughput.
Latitude
This is the geographic latitude of the location of the terminal.
LED
This is a light-emitting diode, which is a semiconductor, that sends out visible light when an electrical current
moves through it.
Light Emitting Diode (LED)
An electronic device that emits light with little generation of heat.
Line Interface Unit (LIU)
The first unit inside the modem units encountered by signals from the user.
Line of Sight (radio) (LOS)
A condition whereby the antennas of a given link have a sufficient path for communication. It requires that at
least 60% of the Fresnel zone between them be unobstructed. (Do not confuse with Loss of Signal.)
Local Area Network (LAN)
A short distance data communications network used to link together computers and peripheral devices
(such as printers) under some form of standard control.
Loopback
This is the process of sending out a test signal to the device on the network so that you know if your signal
was successful or unsuccessful.