User's Manual

SPEEDLAN 9000 Series Installation and Operation User Guide
Glossary-2
Glossary for Standard Data Communications
Alignment
In order to create a successful link, all related equipment should be associated to its respective attachments or equipment.
Amplitude
The magnitude of a waveform when measured from the mid-point to the peak of the wave.
Analog
A signal in the form of a continuously varying quantity such as voltage, frequency or phase.
Antenna
Device used to concentrate and direct the energy of a signal into a tight beam. Parabolic or dish, grid, and Yagi are dif-
ferent varieties of antennas.
Antenna Gain
The ratio of the power radiated by an antenna in a specific direction versus the power required to produce this same
strength if an isotropic antenna were used.
Attenuation
The measure of the loss of power in a microwave signal as it travels between two points. It is measured in decibels (dB).
Attenuator
Attenuators simulate antennas during bench tests.
Azimuth
This is the direction of antenna pointing relative to true north.
Band
A portion of the electromagnetic frequency spectrum.
Bandwidth
The range of frequencies over which a device will transmit information.
Bit
An abbreviation for binary digits.