Data Link Protocols Asynchronous Protocols XMODEM frame ...

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HDLC: Use of P/F fieldHDLC: Use of P/F field43 of 5344 of 53HDLC: S-FrameAcknowledgementHDLC: S-FramePositive Acknowledgement• RR• Receiver sends “Positive Ack” (no data to send)• N(R) = seq of next frame• RNR• Receiver sends “Positive Ack”• N(R) = seq of next frame• Receiver tells sender that sender cannot send anyframe until ‘RR’ frame is received45 of 5346 of 53HDLC: S-FrameNegative AcknowledgementHDLC: U-Frame control field• Reject (REJ)• Go-back-n ARQ• N(R) = # of damage frame (and follow)• Selective-Reject (SREJ)• N(R) = # of damage frameFor session management and control information47 of 5348 of 538
HDLC: U-Frame control fieldHDLC: Polling example49 of 5350 of 53HDLC: Selecting exampleHDLC: Peer-to-peer example51 of 53SABM: Set asynchronous balanced modeUA: Unnumbered ack52 of 53HDLC: Peer-to-peer example53 of 539
Page 1 and 2: Data Link ProtocolsData Link Protoc
Page 3 and 4: Control framesControl frames13 of 5
Page 5 and 6: HDLC Configurations:SymmetricalHDLC
Page 7: HDLC frame: Poll / FinalHDLC Frame:

Data Link Protocols Asynchronous Protocols XMODEM frame ...

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