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The I-4 satellites are made up of the INMARSAT BGAN, FleetBroadband and SwiftBroadband communications network. They provide Internet and telecom connections on the L band everywhere on Earth, except in polar regions.
Two general types of data services are currently provided:
Streaming is a service that guarantees the delivery of data. In this service, a terminal requests a specific bandwidth (currently available in 8, 16, 32, 64, 128, or 256 kbit/s), and if the current spot beam has sufficient resources, the requested bandwidth is allocated to the terminal. For example, if a terminal requests an 8 kbit/s streaming context, it will be able to send data at 8 kbit/s consistently. Consequently, streaming services are billed based on the duration of usage.
Background service is a best-effort approach to data delivery. Each spot beam provides a certain amount of usable bandwidth, and any bandwidth not used by streaming contexts is allocated for background contexts. This means that the actual bandwidth received with a background context may vary over time. The theoretical maximum bandwidth available is approximately 400 kbit/s. As a result, background contexts are billed based on data volume rather than duration of usage.
