DATA COMMUNICATION Lecture-21.

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Presentation transcript:

DATA COMMUNICATION Lecture-21

Recap of Lecture 20 Introduction to Interfaces Digital Data Transmission Parallel Transmission Serial Transmission Asynchronous Transmission Synchronous Transmission

Overview of Lecture 21 DTE-DCE Interface DTE-DCE Interface Standards EIA-232 Null Modem EIA-449

DTE and DCE DTE (Data Terminal Equipment) Any device that is a source of or destination of digital data DCE (Data Circuit terminating Equipment) Any device that transmits/receives signal through network

DTE and DCE

DTE-DCE Interface Standards

EIA-232 Interface Originally RS-232 issued in 1962 Mechanical specification DB-25 pin connector, 15-meter cable DB-9 pin connectors are also available

Sending Data in EIA-232

Control Signals in EIA-232

Functional Specification

EIA-232 Functioning Step 1: Preparation Step 2: Readiness Preparation of the interface between DTE and DCE Step 2: Readiness Checks if all four devices are ready

EIA-232 Functioning Step 3: Set up Step 4: Data Transfer Set up the connection between two DCEs Step 4: Data Transfer DTE -> DCE -> DCE -> DTE

EIA-232 Functioning Step 5: Clearing Turning OFF the connection

Functioning of EIA-232 in Synchronous Full Duplex Mode

Null Modem DTE-DTE interface without DCEs Especially cabled two Female DB-25 Connectors

Null Modem

Null Modem

Summary DTE-DCE Interface DTE-DCE Interface Standards EIA-232 Null Modem

Suggested Reading Section 6.2,6.3, “Data Communications and Networking” 2nd Edition by Behrouz A. Forouzan