DATA COMMUNICATION Lecture-41.

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Presentation transcript:

DATA COMMUNICATION Lecture-41

Recap of Lecture 40 Data Link Protocols Asynchronous Protocols

Overview of Lecture 41 Synchronous Protocols Bit-Oriented Protocols HDLC Link Access Protocols (LAPs)

Synchronous Protocols

Bit-Oriented Protocols

High Level Data Link Control (HDLC) Bit-oriented data link protocol Both half-duplex and full-duplex communication Point-to-point or multipoint links

HDLC Systems using HDLC are characterized by their: Station Types Configurations Response Modes

HDLC-Station Types Station types Primary station: Sends commands Secondary station: Sends responses Combined station: One of a set of connected peer devices

HDLC-Configurations Configurations Unbalanced Symmetrical Balanced

HDLC-Modes

HDLC Frames

HDLC Flag Field

HDLC Address Field

HDLC Control Fields

HDLC Control Fields in the Extended Mode

Poll/Final Field in HDLC

Information Field in HDLC

FCS Field in HDLC

S-Frames in HDLC

U-Frame in HDLC

Link Access Procedures LAPB Link access procedure, balanced LAPD Link access procedure for D- channel LAPM Link access procedure for modems

Summary Synchronous Protocols Bit-Oriented Protocols HDLC Link Access Protocols (LAPs)

Suggested Reading Section11.4, 11.5 “Data Communications and Networking” 2nd Edition by Behrouz A. Forouzan