Iridium's payload

Modulation TDMA (Time Division Multiple Access)
Capacity 3840 phone circuits
Voice 4800 bps
Fax 2400 bps
Data 2400 bps
Total Bandwith 200 MHz
Mobile links 1.5/1.6 GHz
Intersatellite links Ka-band: 18.8-20.2/27.5-30 GHz

On-board commutation. Inter satellite links, each satellite talks with its 4 neighbors
Communications between the gateways and the satellites: Uplink: 29.1-29.3 GHz, Downlink: 19.4-19.6 GHz
Payload built by Motorola's Satcom division in Chandler, Arizona.

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