Packet communications services for the Space Station Freedom

The preliminary design of the space-to-ground packet communications services that have been recommended for the Space Station Freedom Manned Base (SSFMB) is discussed. The packet communications services between the Space Station Freedom and the ground control centers are considered. The packet communications services described include path service for the unacknowledged and unconfirmed delivery of classical spacecraft telemetry, and internet service, which is to be used for the general computer-to-computer communications between the SSFMB and the ground control centers. The concepts of the virtual channel as it relates to delivery of the described packet services are introduced, and other data delivery services that will be provided by the Space Station Information System are briefly reviewed.<
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