article Free AccessImproving round-trip time estimates in reliable transport protocols Authors: Phil Karn Bell Communications Research, Morristown, NJ Bell Communications Research, Morristown, NJView Profile , Craig Partridge Bolt Beranek and Newman, Inc., Cambridge, MA Bolt Beranek and Newman, Inc., Cambridge, MAView Profile Authors Info & Claims ACM Transactions on Computer SystemsVolume 9Issue 4Nov. 1991 pp 364–373https://doi.org/10.1145/118544.118549Published:01 November 1991Publication History 94citation1,450DownloadsMetricsTotal Citations94Total Downloads1,450Last 12 Months87Last 6 weeks4 Get Citation AlertsNew Citation Alert added!This alert has been successfully added and will be sent to:You will be notified whenever a record that you have chosen has been cited.To manage your alert preferences, click on the button below.Manage my AlertsNew Citation Alert!Please log in to your account Save to BinderSave to BinderCreate a New BinderNameCancelCreateExport CitationPublisher SiteeReaderPDF

During the past several years there has been much activity in the development of networking hardware and software for personal computers. At the same time the amateur radio community has been equally active in the development of networking equipment and procedures especially suited for radio circuits. Although the initial efforts have been with terrestrial circuits, experimentation with and development of satellite-based systems is well underway. While we are aware of the many commercial and government organizations active in specialized packet radio systems, our goal is to establish radio networks with inexpensive equipment that is within reach of a large number of individuals with limited budgets. This article will provide a brief history of hardware, software, and protocol development activities as well as a description of amateur packet radio operations. Also discussed are satellite-based operations and development efforts. These include AMSAT-OSCAR-10 and UoSAT-OSCAR-11, currently operating in orbit, and PACSAT, JAS-1, and Phase 3-C, in the design and construction phases.