Browse Prior Art Database

Packet satellite technology reference sources (RFC0829)

IP.com Disclosure Number: IPCOM000003877D
Original Publication Date: 1982-Nov-01
Included in the Prior Art Database: 2019-Feb-14
Document File: 5 page(s) / 7K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

V.G. Cerf: AUTHOR

Related Documents

10.17487/RFC0829: DOI

Abstract

This RFC describes briefly the packet satellite technology developed by the Defense Advanced Research Projects Agency and several other participating organizations in the U.K. and Norway and provides a bibliography of relevant papers for researchers interested in experimental and operational experience with this dynamic satellite-sharing technique.

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This is the abbreviated version, containing approximately 32% of the total text.

Network Working Group V. Cerf Request for Comments: 829 DARPA November 1982

PACKET SATELLITE TECHNOLOGY REFERENCE SOURCES

Vinton G. Cerf Defense Advanced Research Projects Agency

ABSTRACT

This paper describes briefly the packet satellite technology developed by the Defense Advanced Research Projects Agency and several other participating organizations in the U.K. and Norway and provides a biblography of relevant papers for researchers interested in experimental and operational experience with this dynamic satellite-sharing technique.

INTRODUCTION

Packet Satellite technology was an outgrowth of early work in packet switching on multiaccess radio channels carried out at the University of Hawaii with the support of the Defense Advanced Research Projects Agency (DARPA). The primary difference between the earlier packet-switched ARPANET [1, 2] and the ALOHA system developed at the University of Hawaii [3] was the concept of multiple transmitters dynamically sharing a common and directly-accessible radio channel. In the ARPANET, sources of traffic inserted packets of data into the network through packet switches called Interface Message Processors (IMPs). The IMPs used high speed point-to-point full-duplex telephone circuits [4] on a store-and-forward basis. All packet traffic for a given telephone circuit was queued, if necessary, in the IMP and transmitted as soon as the packet reached the head of the queue. On such full duplex circuits there is exactly one transmitter and one receiver in each direction.

The ALOHA system, on the other hand, assigned a common transmit channel frequency to ALL radio terminals. A computer at the University of Hawaii received packet bursts from the remote terminals which shared the "multi-access" channel. Under the control of a small processor, each terminal would transmit whenever it had traffic, and would await an acknowledgement, on another frequency, dedicated to the service host. If no acknowledgement was received, the terminal processor would transmit again at a randomly chosen time. The system operated on the assumption that no store-and-forward or radio relay was needed. The University of Hawaii researchers later demonstrated that the ALOHA concept worked on a satellite channel linking Hawaii and Nasa-Ames via NASA’s ATS-1 satellite [5, 6]. A variety of more elaborate satellite channel assignment strategies were developed and analyzed in the early 1970’s [7-13, 31].

Cerf [Page 1]

RFC 829 November 1982 Remote User Telnet Service

THE ATLANTIC PACKET SATELLITE EXPERIMENT (SATNET)

In 1973, DARPA began the development of a packet satellite system which would support the sharing of a common, high speed channel among many ground stations. Using an INTELSAT-IV satellite, the Atlantic Packet Satellite experiment was carried out with the cooperation and support of the British Post Office, COMSAT Corporation, Linkabit Corporation, and Bolt Beranek and Newman Corporation, later joined by the Norwegian Telecommunication A...

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