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Block Transmission

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Note: Many topics at this site are reduced versions of the text in "The Encyclopedia of Networking and Telecommunications." Search results will not be as extensive as a search of the book's CD-ROM.

When an application such as the FTP (File Transfer Protocol) needs to send a file from one computer to another, it can select from several transmission modes. A concern with any long data transmission is that the transmission might be interrupted or part of the transmission might be corrupted. A block transmission mode can assist in recovering an interrupted transmission.

Block-mode transmissions divide data into multiple blocks and treat each block as a record. Each record has a count field, data, and an end of record marker. The data is sent one block at a time. If the transmission fails, it can be resumed starting at the last record sent.

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