Glossary:

ATIS Telecom Glossary

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FW/NAT

Firewall/ Network Address Translation

FWHM

Abbreviation for full width at half maximum.

FX

Abbreviation for fixed service, foreign exchange service.

G/T

Abbreviation for antenna gain-to-noise-temperature.

GAA

Generic Authentication Architecture

gain

The ratio of output current, voltage, or power to input current, voltage, or power, respectively.
Note 1: Gain is usually expressed in dB.
Note 2: If the ratio is less than unity, the gain, expressed in dB, will be negative, in which case there is a loss between input and output.

gain medium

An active medium, device, or system in which amplification of input occurs with or without feedback.
Note: Gain media include amplifiers, lasers, and avalanche photodiodes (APDs).

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