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Statements

Subject Item
dbr:Janus_(protocol)
rdfs:label
Janus (protocol)
rdfs:comment
Janus is a file transfer protocol for use on bulletin board systems (BBSs). It has the relatively rare feature that it is fully bidirectional, allowing the protocol to upload and download files at the same time. It was written by Rick Huebner in 1987; Huebner had previously written a ZMODEM module for the system.
foaf:isPrimaryTopicOf
wikipedia-en:Janus_(protocol)
dct:subject
dbc:BBS_file_transfer_protocols dbc:Modems
dbo:wikiPageID
55556176
dbo:wikiPageRevisionID
1018094951
dbo:wikiPageWikiLink
dbc:Modems dbr:Modem dbr:List_of_ITU-T_V-series_recommendations dbr:USRobotics dbr:XMODEM dbr:ZMODEM dbr:Cyclic_redundancy_check dbr:Bulletin_board_system dbc:BBS_file_transfer_protocols dbr:File_Transfer_Protocol dbr:FidoNet dbr:Opus-CBBS
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dbt:Start_date_and_age dbt:Orphan dbt:Modem_file_transfer_protocols dbt:Sfn dbt:Infobox_networking_protocol dbt:Reflist dbt:Cite_techreport
dbp:basedOn
dbr:ZMODEM
dbp:developer
Rick Huebner
dbp:purpose
file transfer protocol
dbp:title
Janus
dbp:hardware
modems
dbo:abstract
Janus is a file transfer protocol for use on bulletin board systems (BBSs). It has the relatively rare feature that it is fully bidirectional, allowing the protocol to upload and download files at the same time. It was written by Rick Huebner in 1987; Huebner had previously written a ZMODEM module for the system. Using Janus, Opus BBS systems could save time exchanging files like FidoNet message packets in both directions at the same time, which Huebner described as sending the shorter file for free. In most cases, a given system in the Fido network would download more messages than it sent back, so in practice, the result was that the reply stream was costless. Janus was useful in settings where the upstream and downstream links were both of similar performance, which was true in the mid-1980s when most high-speed modems operated at 2,400 bps bidirectionally. However, the protocol was introduced almost at the same time as the rapid popularization of the USRobotics HST standard with a 9,600 bps download and only 300 bps upload, where Janus offered little or no advantage. When higher-speed bidirectional modems appeared, like v.32bis, Janus had already largely disappeared.
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wikipedia-en:Janus_(protocol)?oldid=1018094951&ns=0
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5415