hdlc protocol

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HIGH-LEVEL DATA LINK CONTROL HDLC Overview ● ● ● ● ● Synchronous Bit-oriented Full-duplex Transparent Point-to-point or multipoint links Features ● ● One frame structure Several elements of procedure GET/INT/LOR/RIP 4 of 33 October 15, 2007
FRAME STRUCTURE Definition Data and control information are transmitted within a single structure: the frame Frame structure Flag 01111110 Address 8 bits Control 8 bits Information 0 ≤ n < ∞ bits FCS 16 bits Flag 01111110 flag: address: control: information: FCS: sequence for synchronization and delimitation address of the secondary station controls the <strong>protocol</strong> behavior user data field frame check sequence GET/INT/LOR/RIP 5 of 33 October 15, 2007
Page 1 and 2: HDLC PROTOCOL Michel GARDIE INT/LOR
Page 3: HDLC ISO 3309 Data communication -
Page 7 and 8: FRAME FIELDS Information field ●
Page 9 and 10: TRANSPARENCY The aim of transparenc
Page 11 and 12: ELEMENTS OF PROCEDURE The elements
Page 13 and 14: FRAME TYPES Information ● The inf
Page 15 and 16: SUPERVISION FUNCTIONS F A C Info FC
Page 17 and 18: SUPERVISION FRAMES RNR RECEIVER NOT
Page 19 and 20: EXTRA FUNCTIONS LAPB (LINK ACCESS P
Page 21 and 22: RULES OF RESTART Some error conditi
Page 23 and 24: RULES OF RESTART RESTART AFTER TIME
Page 25 and 26: ADDRESS FIELD The address field is
Page 27 and 28: FLOW CONTROL DTE W = 3 NETWORK DLDT
Page 29 and 30: EXCHANGE MODES DEFINITIONS INFORMAT
Page 31 and 32: EXCHANGE MODES SYMMETRIC POINT-TO-P
Page 33: CREDITS This document was written w

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