Extensions of packet communication technology to a hand held personal terminal
AFIPS '72 (Spring) Proceedings of the May 16-18, 1972, spring joint computer conference
Packet switching with satellites
AFIPS '73 Proceedings of the June 4-8, 1973, national computer conference and exposition
ALOHA packet broadcasting: a retrospect
AFIPS '75 Proceedings of the May 19-22, 1975, national computer conference and exposition
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This paper addresses communications between office CRT/keyboard intelligent work stations and a remote computer installation using a satellite. The travel industry is used as an example of an industry that could employ direct satellite communications. The office will have a small, inexpensive earth terminal on the premises to support several work stations at that location. A commercial communications satellite with high-gain antenna beams supports the small office terminals. Performance of several channel-sharing protocols is described, and an optimum protocol for this application is discussed. For the example studied, a reservation assignment protocol with slotted Aloha orderwire was selected for its high efficiency. This protocol will support 130 office earth terminals (approximately 390 work stations) in a single satellite channel. The system provides highly responsive service time (1 1/2 seconds average). The cost of digital communications via satellite channels and terrestrial links is compared, and the advantages of satellite communications are discussed.