SLM-5650 Satellite Modem Revision 2
Introduction MN/SLM5650.IOM
1–3
1.1.2 Options
How Enabled Option
FAST Variable data rates from 64 kbps to 5, 10, 20, or 52 Mbps
FAST 8-PSK and 16-QAM
FAST Turbo Data Rates to 5, 10, 20, and 52 Mbps
FAST Automatic Up link Power Control (AUPC)
Hardware Turbo FEC (Card)
Hardware Gigabit Ethernet Interface (Card)
1.2 Modem Design
The modem was designed to accommodate a wide range of currently required features and to be
able to support both near term and far term advances in both software defined radio technology as
well as advances in FEC technology.
The user has the ability to:
• Add or change modular data interfaces and FEC assemblies
• Utilize an extensive array of built in test capabilities
• Be able to easily upgrade the modems capability in the field
• Be able to easily upgrade the modems software in the field
• Have a wide range of flexible remote control options
The user can expect:
• A highly reliable modem
• Low weight and low power dissipation
• A rugged, one-rack unit enclosure that defines state of the art.
The modem is designed for installation in fixed or mobile Earth Terminal (ET) facilities (sites)
using Defense Satellite Communications System III (DSCS III), DSCS III/Satellite Life
Enhancement Program (SLEP), Wideband Gap filler System (WGS), and commercial satellites.
1.3 Modem Description
The modem accepts signals from a selected digital signal source and modulates either a 70/140
MHz or L-Band Intermediate Frequency (IF) carrier with these signals. The demodulator will
receive (Rx) a signal from either a 70/140 MHz or L-Band IF input interface, then demodulate
the IF carrier. Clock and data are recovered and output on a selected data interface.
The transmit and receive functions are independent with respect to coding, interleaving,
overhead, and scrambling. The modem will not allow simplex operation in the 70/140 and
simplex operation in the L-Band IF interfaces at the same time. The modem will allow duplex
operation in either one of the two IF interfaces.