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Talk:Synchronous Data Link Control

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This is an old revision of this page, as edited by Guy Harris (talk | contribs) at 10:47, 27 December 2005 (So which came first - SDLC or HDLC?). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

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.

So are you saying that SDLC was first, and HDLC was derived from it, adding the balanced response modes? Or did HDLC come first, with IBM simplifying it, removing the balanced response modes? Or were they both derived from some other protocol? Guy Harris 10:47, 27 December 2005 (UTC)[reply]
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