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- JMODEM abstract "JMODEM is a file transfer protocol developed by Richard Johnson in 1988. It is similar to the seminal XMODEM in most ways, but uses a variable-size packet in order to make better use of the available bandwidth on high-speed modems.JMODEM uses variable-length records called blocks. These blocks start with 512 data-bytes and increase in length to a maximum of 8192 bytes per block. There is a 6-byte overhead associated with each block so the percentage of overhead starts at a fairly high 1.1 percent and decreases to a very low 0.07 percent as the transmission progresses. The block length will increase in 512-byte increments as long as there are no errors requiring retransmission. Should an error occur, the block-size is cut in half. This continues until the block-size is as short as 64 bytes.JMODEM also included a basic RLE data compression system, which replaces strings of repeated characters with a counter. If a string of many similar characters are found, JMODEM sends a \"sentinel byte\" (hexadecimal 0xBB) followed by a two-byte number, followed by the byte to be repeated. JMODEM applied RLE on a block-by-block basis, as opposed to the file as a whole. Since many files were already compressed with systems like .zip, JMODEM only used RLE on blocks where it actually reduced the size of the block.JMODEM is explained in some detail in the John Dvorak book Dvorak's Guide to PC Telecommunications.".
- JMODEM wikiPageExternalLink jmodem.
- JMODEM wikiPageID "4304833".
- JMODEM wikiPageLength "2028".
- JMODEM wikiPageOutDegree "11".
- JMODEM wikiPageRevisionID "548291901".
- JMODEM wikiPageWikiLink Bandwidth_(computing).
- JMODEM wikiPageWikiLink Category:1988_introductions.
- JMODEM wikiPageWikiLink Category:BBS_file_transfer_protocols.
- JMODEM wikiPageWikiLink Data_compression.
- JMODEM wikiPageWikiLink File_transfer.
- JMODEM wikiPageWikiLink John_C._Dvorak.
- JMODEM wikiPageWikiLink Modem.
- JMODEM wikiPageWikiLink Richard_B._Johnson.
- JMODEM wikiPageWikiLink Run-length_encoding.
- JMODEM wikiPageWikiLink XMODEM.
- JMODEM wikiPageWikiLink Zip_(file_format).
- JMODEM wikiPageWikiLinkText "JMODEM".
- JMODEM wikiPageUsesTemplate Template:Computer-stub.
- JMODEM wikiPageUsesTemplate Template:Modem_file_transfer_protocols.
- JMODEM wikiPageUsesTemplate Template:Notability.
- JMODEM wikiPageUsesTemplate Template:Ref_improve.
- JMODEM wikiPageUsesTemplate Template:Reflist.
- JMODEM wikiPageUsesTemplate Template:Telecommunications-stub.
- JMODEM subject Category:1988_introductions.
- JMODEM subject Category:BBS_file_transfer_protocols.
- JMODEM hypernym Protocol.
- JMODEM type Software.
- JMODEM type Protocol.
- JMODEM comment "JMODEM is a file transfer protocol developed by Richard Johnson in 1988. It is similar to the seminal XMODEM in most ways, but uses a variable-size packet in order to make better use of the available bandwidth on high-speed modems.JMODEM uses variable-length records called blocks. These blocks start with 512 data-bytes and increase in length to a maximum of 8192 bytes per block.".
- JMODEM label "JMODEM".
- JMODEM sameAs Q6108527.
- JMODEM sameAs m.0bw3n0.
- JMODEM sameAs Q6108527.
- JMODEM wasDerivedFrom JMODEM?oldid=548291901.
- JMODEM isPrimaryTopicOf JMODEM.