OCR AS Level F451: Data transmission

Slides:

Advertisements

Similar presentations

Lecture 12 Layer 2 – Data Link Layer Protocols

Advertisements

A-Level Computing#BristolMet Session Objectives#11 MUST identify the hardware required to connect to the Internet SHOULD describe how data is transmitted.

Chapter 6 Errors, Error Detection, and Error Control.

Data Link Layer – Part 1 V.T.Raja Oregon State University.

1 Chapter Six - Errors, Error Detection, and Error Control Chapter Six.

Long distance communication Multiplexing  Allow multiple signals to travel through one medium  Types Frequency division multiplexing Synchronous time.

CS335 Networking & Network Administration Wednesday, April 7 PacketsPackets, Frames, and Error DetectionFramesError Detection.

Unit 1 Protocols Learning Objectives: Understand the need to detect and correct errors in data transmission.

Synchronous - Asynchronous Data Transmission. Asynchronous ► The sender and receiver are not Synchronised. ► The sender sends only one character at a.

Error Detection and Correction.  Corrupted files  Attachments that won’t open  Files that won’t download  Videos that won’t play Errors occur when.

Rutvi Shah1 ERROR CORRECTION & ERROR DETECTION Rutvi Shah2 Data can be corrupted during transmission. For reliable communication, errors must be detected.

RNJ 10/02/091 3 Computing System Fundamentals 3.6 Errors Prevention and Detection.

AS Computing F451 F451 Data Transmission. What data is transmitted? Phone SMS Radio TV Internet.

Error Detection and Correction

Integrity in Data Communications Packets, Frames and Error Detection.

PART III DATA LINK LAYER. Position of the Data-Link Layer.

British Computer Society

CIT 307 Online Data Communications Error Detection Module 11 Kevin Siminski, Instructor.

Data and Computer Communications

Part 2: Packet Transmission Packets, frames Local area networks (LANs) Wide area networks (LANs) Hardware addresses Bridges and switches Routing and protocols.

10.1 Chapter 10 Error Detection and Correction Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.

AS Computing Data Transmission and Networks. Transmission error Detecting errors in data transmission is very important for data integrity. There are.

1 Chapter Six - Errors, Error Detection, and Error Control Chapter Six.

Error Detection and Correction

Communication Systems 3.1) Characteristics of a Communication System.

Chapter 7 - Packets, Frames and Error Detection 1. Concepts of Packets 2. Motivation for Packet Switching 3. Framing 4. Frame Formats 5. Transmission Errors.

The Principle of Electronic Data Serial and Parallel Data Communication Transmission Rate Bandwidth Bit Rate Parity bits.

COMPUTER NETWORKS Ms. Mrinmoyee Mukherjee Assistant Professor St. Francis Institute of Technology, Mount Poinsur, S.V.P Road, Borivli (west), Mumbai

Overview All data can be corrupted, for reliable communications we must be able to detect and correct errors implemented at the data link and transport.

1 Chapter 7 Switching, Packets, Frames, Parity, Checksums, and CRCs.

1 © Unitec New Zealand CRC calculation and Hammings code.

Error Detection.

SEPT, 2005CSI Part I.2 Packets, Frames, Parity, Checksums, and CRCs Dr. R.L. Probert, SITE, University of Ottawa.

2.2 Interfacing Computers MR JOSEPH TAN CHOO KEE TUESDAY 1330 TO 1530

Reasons to  Binary With Mrs

Network Layer4-1 Chapter 5: The Data Link Layer Our goals: r understand principles behind data link layer services: m error detection, correction m sharing.

Data Link Layer 1. 2 Single-bit error 3 Multiple-bit error 4.

ERROR DETECTION AND CORRECTION Chapter 8 Data Communications & Networking ERROR DETECTION AND CORRECTION Chapter 8 First Semester 2007/2008.

Data Transmission and Networks Transmission error checking & correcting.

10.1 Types of Errors 10.2 Detection 10.3 Error Correction.

2.8 Error Detection and Correction

Introduction to Information Technologies

ERROR DETECTION AND CORRECTION

Data Link Layer.

ERROR CORRECTING CODES

Chapter 7 Packets, Frames, and Error Detection

Serial I/O and Data Communication.

Error Detection and Correction

Data Link Layer What does it do?

Data Link Layer.

Error Detection Bit Error Rate(BER): It is the ratio of number Ne of errors appearing over a certain time interval t to the number Nt of 1 and 0 pulses.

Dhanushiya. R I YEAR BSc COMPUTER TECHNOLOGY.  Error is a condition when the output information does not match with the input information. During transmission,

EEC4113 Data Communication & Multimedia System Chapter 5: Error Control by Muhazam Mustapha, August 2010.

Packetizing Error Detection

Packetizing Error Detection

Lesson Objectives Aims You should know about: 1.3.3:

Introduction to Information Technologies

Packetizing Error Detection

Protocols and the TCP/IP Suite

Packets, Frames, Parity, Checksums, and CRCs

COMPUTER NETWORKS CS610 Lecture-5 Hammad Khalid Khan.

Packets, Frames, Parity, Checksums, and CRCs

Error Detection and Correction

Switching, Packets, Frames, Parity, Checksums, and CRCs

Types of Errors Data transmission suffers unpredictable changes because of interference The interference can change the shape of the signal Single-bit.

Error Detection and Correction

Error Detection Learning Objectives:

2.8 Error Detection and Correction

Data Link Layer. Position of the data-link layer.

Presentation transcript:

OCR AS Level F451: 3.1.5 Data transmission d. Explain the relationship between bit rates and the time sensitivity of the information; e. Recognize that errors can occur in data transmission, and explain methods of detecting and correcting these errors (parity checks, the use of parity in data blocks to become self-correcting, checksums and echoes);

OCR AS Level F451: 3.1.5 Data transmission d. Explain the relationship between bit rates and the time sensitivity of the information;

Bit rates vs time sensitivity OCR AS Level F451: 3.1.5 Data transmission Bit rates vs time sensitivity Bit rate – The number of bits transmitted each second or the rate at which data is transferred. Different bit rates are suitable for different applications. Largely based on how time sensitive the information is. Video streaming: Requires a high bit rate as there is lots of data and any delay will interrupt the video. Transferring word documents: Can use a lower bit rate as the files are needed on real time and people can wait a few min for the files to arrive.

OCR AS Level F451: 3.1.5 Data transmission e. Recognize that errors can occur in data transmission, and explain methods of detecting and correcting these errors. (parity checks, the use of parity in data blocks to become self-correcting, checksums and echoes);

Errors in data transmission OCR AS Level F451: 3.1.5 Data transmission Errors in data transmission Its very easy for data to become corrupted during transmission. There are three main ways that computers check for errors in data. Echoing back – The receiver sends the data back to the sender who checks that it matches what was originally sent. Check sums – Extra digits or numbers are added to the end of a complex sequence. These numbers are calculated based on the numbers in the sequence. When the sequence is received the check number is recalculated and if it doesn't match then the data is re-sent. Parity check – 1 bit in each byte is reserved as the parity bit. The parity bit is 1 if the number of 1s in the rest of the byte is odd and 0 if the number of 1s is even.