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The Iridium constellation consists of 66 low-earth orbiting (LEO), cross-linked satellites operating as a fully meshed network. That's more satellites than any other constellation and it's the largest commercial satellite constellation in the world. This is what makes the Iridium network unique. Several overlapping satellites ensure the globe is covered. An independent study found the Iridium network to have the best call quality and call completion rates over other similar competitors. This is one of the many reasons the U.S. military relies on the Iridium network.

The on-orbit Iridium constellation consists of 66 operational satellites and 14 spares in a constellation of six polar planes. Each plane has 11 mission satellites performing as nodes in the telephony network. The 14 additional satellites orbit as spares ready to replace any unserviceable satellite. This constellation ensures that every region on the globe is covered by at least one satellite at all times. The satellites are in a near-polar orbit at an altitude of 485 miles (780 km). They circle the earth once every 100 minutes travelling at a rate of 16,832 miles per hour. Each satellite is cross-linked to four other satellites; two satellites in the same orbital plane and two in an adjacent plane. These links create a dynamic network in space - calls are routed among Iridium satellites without touching the ground, creating a highly secure and reliable connection. Cross-links make the Iridium network particularly impervious to natural disasters - such as hurricanes, tsunamis and earthquakes - that can damage ground-based wireless towers.

	IRIDIUM 9555  Water, shock and dust resistance Enhanced SMS and email messaging capability Integrated speakerphone Headset and hands-free capability Internally stowed antenna Compact physical footprint Mini-USB data port
	Iridium IntelliDOCK 95555 The The entry-level IntelliDOCK 9555 offers semi-permanent solutions that are great for maritime, transport or fixed site applications. The station docks the Iridium 9555 handset securely and fully integrates antenna, data and power connections keeping all cables and power permanently connected so it’s always ready when you are. You can also integrate Bluetooth with the Iridium 9555 phone for various hands-free applications. Supports hands-free calling Charges the 9555 handset to ensure it is ready for use Supports Bluetooth voice and data accessories Bluetooth and USB data connectivity Supports Iridium voice, data, SMS and SBD services Built in ringer Mute button Integrated antenna connection 9-32V DC input Optional 110-240V AC plug pack RAM universal mounting bracket Suitable for wall mounting Easy installation Optional privacy handset with auto sensing answer/hang up intelligence
	RST620 FixedSAT Complete hands-free permanent voice and data solution with the loudest ringer.   With an integrated Iridium transceiver, the RST620 FixedSAT is ideal for use in any vehicle. It can be installed to provide a compact user handset that’s close to the driver. It also gives you the option of having an external ringer or light alerts. Fixed voice and data solution with fixed, compact intelligent handset Supports SMS, phone book, privacy and hands-free mode Can be installed to a wide DC input voltage Very loud ringer through the speaker provided Smart features such as radio mute, horn alert and accessory sense power activation Compact installation Serial data port Operate in private or hands-free mode Echo cancellation Superior voice quality 10-32V DC power input Tracking and monitoring capabilities Intelligent processor and interface Supports external ringer/light Auxiliary and constant power Support all data services Support all voice services Support Iridium fax terminal