SATELLITE COMMUNICATIONS
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The SDM-9000 satellite modem is a high-performance, fullduplex, digital vector modulator/demodulator designed for IDR applications from 6 to 52 Mbit/s. When equipped with a G.703 interface and ESC overhead framing unit, the SDM-9000 meets all requirements for IESS-308 specifications.
INTERFACES
Three interfaces are available as plug-in circuit cards:
DATA RATE FLEXIBILITY
Data rate modules can support 1, 2, 3, or 4 different symbol rates. Field-installable data rate kits accommodate additional data rates.
BANDWIDTH EFFICIENT
Digital signal processing is used to provide advanced modulation techniques for reduction bandwidth. Supported signals include QPSK, 8PSK, and 16QAM
VITERBI AND REED-SOLOMON
The SDM-9000 utilizes the 3-wide punctured convolutional encoder and Viterbi decoder specified in IESS-308. Optional: Reed-Solomon coder/decoder is available for enhanced error correction capabilities
EXTENSIVE DIAGNOSTICS
The SDM-9000 contains extensive diagnostic tools, including:
Diagnostic tools simplify the initial installation and checkout of the modem. The tools also offer a high degree of maintainability over the service life of the modem. The modem is able to store complete status information on each fault, in order of occurrence. This diagnostic feature enables a technician to easily isolate and correct system problems without being present at the time of the fault. All circuit cards are removable and interchangeable between chassis without readjustment to further ease repair and troubleshooting.
BACKUP SWITCHING
The SDM-9000 has two companion protection switches: SMS-458B 1:N and SMS-451A 1:1.
OVERHEAD FRAME UNIT
The SDM-9000 G.703 interface can be supplied with an onboard ESC overhead channel unit. The overhead channel meets the requirements of IESS-308 and includes:
The ECL and MIL-STD-188-114 interfaces can also be fitted with an onboard ESC overhead framing unit.
