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How is 3770 SNA/RJE emulation different from 3780 BSC/RJE emulation?

April 26, 2017BSC different emulation rje sna

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How is 3770 SNA/RJE emulation different from 3780 BSC/RJE emulation?

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Fundamentally 3770 SNA/RJE and 3780 BSC/RJE terminals were designed to do the same job: namely, submit batch jobs from a remote location to an IBM mainframe computer. (Oddly the 3780 terminal came before the 3770 family.) The difference is in the underlying communications protocols used by the terminals. 3780 BSC/RJE uses the IBM Binary Synchronous Communications (BSC or bisync) protocol while a 3770 SNA/RJE terminal uses the SDLC protocol (or other protocol supported by IBM’s SNA network). These protocols are mutually exclusive and therefore 3770 and 3780 terminals are not interchangeable.