ViaSat ArcLight, User Manual, Page: 25 / 368

ArcLight Hub User’s Guide
Rev. 001 1081006 xvii
Acronyms, Descriptions and Definitions
ACU Antenna control unit An outside controller for an antenna
interfaced to a remote computer.
AGC
Automatic gain control An electronic system to control the gain of
a system in order to maintain adequate
performance over a range of input signal
levels.
APR
Automated position reporting Automated updating of the location of a
mobile site.
ATI
Automated transmit inhibit An automatic control element that blocks
transmissions.
ASW
ArcLight setup wizard An automated tool for software
installation and configuration using a
series of windows that lead the user
through the initial setup process.
ATM
Asynchronous transfer mode Organizes digital data into 53-byte
cell
units and transmits them over a physical
medium using digital signal technology.
BB
Bulletin board messages A site for the exchange of internet
communications.
BER
Bit error ratio the ratio of the number of bits, elements,
characters, or blocks incorrectly received
to the total number of bits, elements,
characters, or blocks sent during a
specified time interval.
BUC Block up-converter Converts a band (or "block") of frequencies
from a lower frequency to a higher
frequency.
CDC
Correlator demodulator card A MCD card.
COTS Commercial off the Shelf Software or hardware products, ready-
made and available for sale to the general
public
CT
Congestion threshold A limit that initiates congestion control.
CRMA
Code reuse multiple access A transmission medium multiplexing
scheme.
CW
Continuous wave An electromagnetic wave of constant
amplitude and frequency.
D/A Digital to analog converter A device for converting a digital (usually
binary) code to an analog signal (current,
voltage or electric charge).