Specifications

SDM-300L3 Satellite Modem Revision 0
Introduction MN/SDM300L3.IOM
1–3
1.1 Overview
The SDM-300L3 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 kbps to 5.0 Mbps
• Fully Accessible System Topology (FAST)
• Closed Network Capability
• Automatic Uplink Power Control (AUPC)
• Asynchronous (ASYNC) Channel Unit Overhead
• Reed-Solomon
• Turbo Product Coding
• FAST Acquisition
• Built-In Test
• BPSK, QPSK, OQPSK, and 8PSK
• BUC FSK Communications
1.2 Options Summary
A summary of the available options for the unit is provided. Contact Comtech EF Data
Customer Support for upgrade information.
Option Description & Comments Availability
Install
Option
Single Data/Code Rate Yes FAST
Low Rate Variable
≤ 512 kbps
Yes FAST
Full Rate Variable
≤ 5.0 Mbps
Yes FAST
OQPSK Yes FAST
8PSK Requires Viterbi, Reed-Solomon
Codec. Overhead card required for
Open Network.
Yes User
TX/RX L-Band ± 0.02 ppm
L-Band Modem with high stability
reference.
Standard Factory
TX only, L-Band ± 0.02 ppm
Hardware limited with high stability
reference.
Yes Factory
RX only, L-Band ± 1.0 ppm
Hardware limited with 1 ppm reference Yes Factory
TX/RX L-Band ± 1.0 ppm
L-Band modem with 1 ppm reference Yes Factory
Sequential or Viterbi Codec Modem can be supplied with either:
Viterbi, Sequential
Yes FAST
TX Reed-Solomon Codec Concatenates with Viterbi Yes User
RX Reed-Solomon Codec Concatenates with Viterbi Yes User
Turbo Codec Requires Reed-Solomon Codec
removal.
Yes User
Asymmetrical Loop Timing (SCT) Yes FAST
Asynchronous (Async/AUPC) Interface
with 50 pin D Connector
Requires Overhead Card. Includes
automatic uplink power control (AUPC)
Yes User
AUPC (No ASYNC) Requires Reed-Solomon cards Yes User or FAST
2xADPCM Voice (included with IBS or
IDR)
Two voice channels in a 64 kbps IBS
channel. Requiring Overhead card
Yes User