Navy Selects Comtech EF Data to Provide Satellite Communications Modems for Shipboard and Shore Applications

SAN DIEGO- US shipboard communications experts needed satellite modems and upgrades for surface warships, submarines and shore sites. They found their solution with Comtech EF Data Corp. in Tempe, Arizona.

Naval Information Warfare Systems Command officials in San Diego on Friday announced a $13.1 million order from Comtech EF Data for Comtech SLM-5650B modems, SLM-5650B modem upgrade kits, upgrades firmware level and technical support.

Commercially available modems support satellite communications (SATCOM) and interoperability between Navy platforms and shore sites. The order increases the current value of the contract from $58.8 million to $71.9 million.

The SLM-5650B Satellite Modem is intended for critical military, government and commercial SATCOM backhaul applications. It is compliant with MIL-STD-188-165A/B, STANAG 4486 Annex E Edition 3 and supports FIPS 140-2 certified encryption.

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The SLM-5650B supports backward compatibility and interoperability for existing SLM-5650A networks while providing improved performance. Features include a Gigabit Ethernet bridge interface; LNB reference and voltage; and BUC reference.

The SLM-5650B is intended for applications with Defense Satellite Communications System (DSCS), Wideband Global SATCOM (WGS), and commercial satellites.

Data rates from 8 kilobits per second to 155 megabits per second and supports symbol rates from 32 kilo-samples per second to 64 mega-samples per second. The modem provides standard MIL-STD-188-114 (EIA-530 / RS-422) and EIA-613 (HSSI) serial interfaces and can be configured to support G.703 serial interfaces and Low Voltage Differential Signaling ( LVDS).

It can support a 4-port 10/100/1000Base-T Ethernet network processor module supporting switching, routing, and advanced QoS protocols. The military typically uses these SATCOM modems for secure communications on the go in harsh environments.

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Direct-sequence spread spectrum is available to support point-to-point and optional point-to-multipoint applications with LDPC-based FEC and BPSK. Spreading factors up to 512 are supported. The IF interface supports frequency ranges of 52 to 88, 104 to 176, and 950 to 2000 MHz.

The modem supports EIA-530 (RS 422), EIA-612/613 (HSSI) and a single Gigabit Ethernet port as standard features. An optional 4-port Gigabit Ethernet interface is also available.

For more information, contact Comtech EF Data online at, or the Naval Information Warfare Systems Command at