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- Plan_55-A abstract "Plan 55-A was a store and forward message switching system developed by Western Union and used from 1948 to 1976. Western Union's own system handled telegrams, and a military version of the system was used by the U.S. Department of Defense.Leonard Kleinrock analyzed the queueing delays of Plan 55-A in his PhD thesis, and this work formed part of the theoretical basis for the ARPAnet.Plan 55-A was a predecessor of E-mail. A Plan 55-A center performed functions similar to an e-mail server, but without computers. In a Plan 55-A switching center, incoming messages came in over serial communication lines from teleprinters or from other switching centers, and were received by "receiving consoles", each consisting of a paper tape punch feeding tape into a paper tape reader via a storage bin. The reader would read the message header, and send the header characters to a "director". The director, much like a telephone switch, would connect the receiving console to a "sending console" in the same switching center. This was referred to as a "cross-office connection". The message would then be transmitted from the receiving console to the sending console, character by character, punching a second paper tape at the sending console. Cross-office connections, and their readers and punches, were slightly faster than external connections, to keep congestion out at the edges of the network.Each sending console, like each receiving console, consisted of a paper tape punch and reader. Output from each sending console went out onoutgoing lines to other switching centers or to destination teleprinters. Each message typically contained one telegram.".
- Plan_55-A thumbnail Plan55acenter1.jpg?width=300.
- Plan_55-A wikiPageExternalLink Telegram1956.
- Plan_55-A wikiPageID "21933113".
- Plan_55-A wikiPageLength "3100".
- Plan_55-A wikiPageOutDegree "14".
- Plan_55-A wikiPageRevisionID "574409414".
- Plan_55-A wikiPageWikiLink ARPANET.
- Plan_55-A wikiPageWikiLink ARPAnet.
- Plan_55-A wikiPageWikiLink Category:History_of_telecommunications_in_the_United_States.
- Plan_55-A wikiPageWikiLink Category:Western_Union.
- Plan_55-A wikiPageWikiLink E-mail.
- Plan_55-A wikiPageWikiLink Email.
- Plan_55-A wikiPageWikiLink File:Plan55acenter1.jpg.
- Plan_55-A wikiPageWikiLink Industrial_film.
- Plan_55-A wikiPageWikiLink Leonard_Kleinrock.
- Plan_55-A wikiPageWikiLink Message_switching.
- Plan_55-A wikiPageWikiLink Serial_communication.
- Plan_55-A wikiPageWikiLink Sponsored_film.
- Plan_55-A wikiPageWikiLink Store_and_forward.
- Plan_55-A wikiPageWikiLink Telegrams.
- Plan_55-A wikiPageWikiLink Telegraphy.
- Plan_55-A wikiPageWikiLink Teleprinter.
- Plan_55-A wikiPageWikiLink Western_Union.
- Plan_55-A wikiPageWikiLinkText "Plan 55-A".
- Plan_55-A hasPhotoCollection Plan_55-A.
- Plan_55-A wikiPageUsesTemplate Template:Cite_web.
- Plan_55-A wikiPageUsesTemplate Template:Telecomm-stub.
- Plan_55-A subject Category:History_of_telecommunications_in_the_United_States.
- Plan_55-A subject Category:Western_Union.
- Plan_55-A hypernym Store.
- Plan_55-A type Company.
- Plan_55-A comment "Plan 55-A was a store and forward message switching system developed by Western Union and used from 1948 to 1976. Western Union's own system handled telegrams, and a military version of the system was used by the U.S. Department of Defense.Leonard Kleinrock analyzed the queueing delays of Plan 55-A in his PhD thesis, and this work formed part of the theoretical basis for the ARPAnet.Plan 55-A was a predecessor of E-mail.".
- Plan_55-A label "Plan 55-A".
- Plan_55-A sameAs m.05p7fj6.
- Plan_55-A sameAs Q7200868.
- Plan_55-A sameAs Q7200868.
- Plan_55-A wasDerivedFrom Plan_55-A?oldid=574409414.
- Plan_55-A depiction Plan55acenter1.jpg.
- Plan_55-A isPrimaryTopicOf Plan_55-A.