Comtech EF Data SDM-300L - Manual (Page 14)

SDM-300L Satellite Modem Introduction
Rev. 2 1–3
1.1 Overview
The SDM-300L utilizes advanced technology and digital signal processing techniques.
This design eliminates circuitry to perform modem signal processing, resulting in higher
reliability. The following lists the unit's features:
•
2.4 kbit/s to 4.375 Mbit/s
•
Fully Accessible System Topology (FAST)
•
Closed Network Capability
•
Automatic Uplink Power Control (AUPC)
•
Asynchronous (ASYNC) Channel Unit Overhead
•
Reed-Solomon
•
FAST Acquisition
•
Built-In Test (With L-Band TX and RX only)
•
OQPSK
1.1.1 Available Options
FAST is Comtech EFData’s exclusive feature that eliminates the need to acquire options
before they are required. The following list reflects the options available via FAST
implementation.
•
Variable Data Rate
•
G.703 Interface
•
Viterbi or Sequential
Decoder
•
Concatenated Reed-Solomon Codec
•
OQPSK
•
ASYNC/AUPC Overhead with 50-pin D connector
•
Asymmetrical Loop Timing
When additional features are required, they are added on site, using FAST access codes
(Appendix A). For addition information, contact the Comtech EFData Customer Support
department.
1.1.2 Monitoring Features
The unit's monitoring features include:
•
Interface Loopback – at the MOD and DEMOD interface (Bi-directional)
•
Baseband Loopback – at the data interface (Bi-directional)
•
BER, E
b
/N
0
, Buffer Fill Percentage
•
IF Loopback (Not available with 70/140 MHz TX IF)