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Synchronous Data Link Control
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=== HDLC extensions added to SDLC === Some features were added in HDLC, and subsequently added back to later versions of SDLC. * Extended (modulo-128) sequence numbers and the corresponding SNRME U frame, were added to SDLC after the publication of the HDLC standard.<!-- Because they're in the 1986 document but not the 1979 one-->
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