Satellite Modem
What satellite access methods does the GMT use?
FDMA, TDMA, CDMA, WCDMA, and DAMA
What kind of cable does the GMT use that is less vulnerable to EMI?
Coaxial Cable
How many hubs does each GMT have?
2
How many antenna cases come with the GMT?
19
How many electronic cases come with the GMT?
6
This works by adding an artificial redundancy to a data stream and uses this redundancy to fix errors.
Forward Error Correction (FEC)
This is attached to a waveguide, can be linearly or circularly polarized, and focuses a beam into the reflector.
Feedhorn.
How many frequency bands does the GMT operate in?
4
How far can the local PDP be separated from the local power source?
50 feet
What is dedicated to preserving power in the event of facility or generator failure?
Uninterrupted Power Supply (UPS)
How many modems are there TOTAL with the GMT?
What kind of polarization can be either left or right hand polarized?
Circular Polarization
How many uplinks and downlinks are there per GMT terminal?
2 uplinks, 12 downlinks
What kind of pallet can be used with the GMT?
463L
How far can the remote PDP be from the local PDP?
250 feet
This randomizes data to obfuscate analog data streams making it difficult to read without a proper key at the receiver. Not to be confused with encryption.
Scrambling
This is used to reflect a signal to and from space into or from a feedhorn and is inversely proportional to the frequency being used.
Parabolic reflector.
What frequency bands does the GMT operate in?
C, X, Ku, and Ka
How many cases total come with the GMT?
29 cases
How many spare cases are there?
2
The GMT satellite modem can interface with these connections (name 2).
RS-232, RS-422, HSSI, EIA-530, and Ethernet
What kind of polarization can be either horizontal or vertical?
Linear Polarization
What is the largest antenna that the GMT operates with?
QRSA (Quick Reaction Satellite Antenna) - 20 foot dish.
Using a local and remote PDP, how far can the GMT be from the local power source?
300 feet
What kind of cable are PDPs designed for?
60 Amp, 5 wire power cables