Installation Manual

Table Of Contents
glossary-6 © 1999 Triton Network Systems, Inc. All Rights Reserved.
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ADM
See Add/Drop Multiplexer (ADM).
AIS
See Alarm Indication Signal (AIS).
Alarm Indication Signal (AIS)
A special signal that is transmitted to downstream equipment for specific
equipment fault conditions.
antenna
A mechanical device that can convert electrical signals to and from
electromagnetic waves. An IFU contains an antenna.
Asynchronous Transfer Mode (ATM)
A cell-based protocol, developed by the ITU-T, for transmitting and switching
voice, video, and data traffic. ATM technology does not use a fixed timing
reference, hence the name asynchronous.
ATM
See Asynchronous Transfer Mode (ATM).
atmospheric absorption
Amount of energy lost when radio waves are transmitted due to the presence
of atmospheric gases.
attenuation
The reduction in the strength of a signal measured in dB. See also
propagation loss.
azimuth
The horizontal angle the radiating lobe of an antenna makes. When you adjust
an IFU by its azimuth, you move it on its horizontal plane (left to right or right
to left).
B
backbone
A backbone is the transport path that provides connectivity to other paths. On
the Internet or a WAN, the backbone is a series of paths to which local,
regional, or global networks connect.