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Talk:Synchronous Data Link Control

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SDLC is the data link protocol under Systems Network Architecture (SNA). HDLC is the ISO variant of Synchronous Data Link Control (SDLC) protocol from IBM.

SNA replaced Binary Synchronous (BSC) protocol in the 1970s at the primary mainframe to mainframe communications protocol. SDLC was and has remained the data link protocol for remote terminal and data entry equipment for mainframe systems. The Normal Response Mode (NRM) of HDLC is equivalent to SDLC.

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