Comtech SLM-5650B

Satellite Modem


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The SLM-5650B Satellite Modem is our latest generation USARSTRAT WGS certified modem product targeted for critical commercial backhaul and government and military applications. It is fully compliant with MIL-STD-188-165A/B and fully complies with STANAG 4486 Edition 3, Annex E (EBEM) and supports FIPS 140-2 certified encryption. The SLM-5650B leverages the heritage and feature set of our very successful SLM-5650A modem. The SLM-5650B supports backwards compatibility / inter-operability for existing SLM-5650A networks while providing enhanced performance and new features including: 


• Gigabit Ethernet Bridge interface

• LNB reference and voltage

• BUC reference


• Field Programmable Gate Array (FPGA)resource increased by x5 (future proof)

• Maximum spreading factor (512)

• Maximum chip rate (64 Mcps)

• Maximum symbol rate with LDPC (40Msps)


• DSSS acquisition times (x8 faster)

• Power consumption (reduced ~ 25%)

• Chassis length (reduced 1.5 inches)

The SLM-5650B is compliant with the strict requirements defined in MIL-STD-188-165A, modem types I, II, IV, V and VI for applications on DSCS, WGS and commercial satellites. Data rates from 8 kbps to 155 Mbps and symbol rates from 32 ksps to 64 Msps are supported. The modem provides standard MIL-STD-188-114 (EIA-530 / RS-422), and EIA-613 (HSSI) serial interfaces, and can be optionally configured to support G.703 and Low Voltage Differential Signaling (LVDS) serial interfaces. It can also optionally be equipped with a 4-port 10/100/1000Base-T Ethernet Network Processor module that supports switching, routing and advanced Quality of Service protocols. 

The SLM-5650B can be integrated with the Vipersat Management System (VMS) to provide fully automated network and capacity management (future software upgrade). An AES-256 TRANSEC module, compliant with the FIPS 140-2 standard, is also available as an option. All traffic (including overhead and all VMS control traffic) is encrypted when using the TRANSEC module. 

Advanced forward error correction (FEC) capabilities are a Comtech EF Data standard feature. Viterbi, Trellis, Concatenated Reed-Solomon, Sequential, Turbo Product Codes, and three Low Density Parity Check codes (LDPC) families are all supported. 

Direct sequence spread spectrum is available to support both point-to-point and point-to-multipoint applications as an option in conjunction with LDPC-based FEC and BPSK. Spreading factors up to 512 are supported. Maximum supported chip rate is 64 Mcps. Spread spectrum results in operation with ultra-low power spectral densities. This enables use of small antenna apertures when adjacent satellite interference (ASI) is an important consideration. 

The IF interface supports 52 to 88, 104 to 176, and 950 to 2000 MHz frequency ranges. 


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