TracPhone V3-IP User’s Guide
146
Glossary
Ethernet
Network communications standard adopted by most LANs.
Communicates via twisted pair cable at one of three maximum data
rates: (1) Standard - 10 Mbps, (2) Fast - 100 Mbps, and (3) Gigabit -
1 Gbps (1,000 Mbps).
Firewall
Security mechanism that protects a network from unauthorized access.
Floating Ground
Dangerous condition in which the chassis ground of an electrical
device differs from ship’s ground. This difference can measure well
over 100 volts, risking damage to the equipment and electric shock,
potentially resulting in death. A floating ground can be prevented by
ensuring proper grounding of the device to ship’s ground.
Footprint
Coverage area of a satellite.
Forward Link
Communication path from the satellite hub to the user terminal.
Another term for “Downlink.”
Frequency
Number of cycles per second of a radio wave, measured in Hertz (Hz).
GPS
Global Positioning System. Network of satellites that allow anyone
with a GPS device to accurately fix their position on Earth.
Gyro
A device that precisely senses and measures motion in a single axis,
such as elevation or azimuth.
Host
Any computer connected to a network.