Communication Systems I CPE 313: Micro Processors and Interfacing.

Slides:

Advertisements

Similar presentations

By Taylor and Ed. Uses standard voice telephone lines Uses a modem to place a telephone call to another modem at a remote site Two major disadvantages.

Advertisements

Physical layer: Public Switched Telephone Network (PSTN)

High Speed Digital Access

Presented by: Eng. Karam Al-sofy

Networking at Home and Abroad

9.1 Chapter 9 Using Telephone and Cable Networks for Data Transmission Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction.

Lecture 26 Physical Layer Ch 4: Digital Transmission

1 Computer Communication & Networks Lecture 6 Physical Layer: Digital Transmission Waleed Ejaz

Broadband local access technology

Physical Layer CHAPTER 3. Announcements and Outline Announcements Credit Suisse – Tomorrow (9/9) Afternoon – Student Lounge 5:30 PM Information Session.

CSCI 4550/8556 Computer Networks Comer, Chapter 12: Long Distance Digital Connection Technologies.

1 9 9 TELECOMMUNICATIONS AND NETWORKS. 2 Telecommunications Communicating information via electronic means over some distance Information SuperHighway.

MULTIPLEXING APPLICATION The Telephone System. Telephone Network.

Analog to Digital (digital telephony) Given an analog function (voice?) we wish to represent it as a sequence of digital values Pulse Amplitude Modulation.

Ch. 8 Multiplexing.

Chapter 8 Data and Network Communication Technology

WAN Technologies Lecture 9 Paul Flynn.

1 K. Salah Module 3.3: Multiplexing WDM FDM TDM T-1 ADSL.

CMPE 150- Introduction to Computer Networks 1 CMPE 150 Fall 2005 Lecture 7 Introduction to Networks and the Internet.

4.1 Chapter 4 Digital Transmission Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.

CS335 Networking & Network Administration Wednesday, April 14, 2010.

Module 2.2: ADSL, ISDN, SONET

9.1 Chapter 9 Using Telephone and Cable Networks for Data Transmission Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction.

Digital Subscriber Line- DSL

Analog and Digital Transmission Interfaces and Multiplexing (Physical Layer) Lita Lidyawati 2012.

Local Asynchronous Communication

What is ADSL? n ADSL stands for Asymmetric Digital Subscriber Line. n Modem technology that transforms ordinary phone into high-speed digital lines for.

Chapter 12 Long-Distance Digital Connection Technologies Pulse Code Modulation DSU/CSU ISDN ADSL Cable Modem.

© 2014 Pearson IT Certification Chapter 10 – Internet Connectivity.

Digital to analogue conversion. 1 DIGITAL-TO-ANALOG CONVERSION Digital-to-analog conversion is the process of changing one of the characteristics (A,

Networking Technologies

Data Transmission The basics of media, signals, bits, carries, and modems (Part II)

Review: The application layer. –Network Applications see the network as the abstract provided by the transport layer: Logical full mesh among network end-points.

Lecture 2 Computer Communications and Networks Boriana Koleva Room: C54 Phone:

1 Information Technology in Business: Telecommunications and Networks Chapter 6.

Telecommunications systems (Part 2) School of Business Eastern Illinois University © Abdou Illia, Spring 2007 (Week 12, Thursday 3/29/2007) T-1 Digital.

Introduction to data and network communications  History of telecommunications  Data communication systems  Data communications links  Some hardware.

Modems Mostly used to connect PCs to the Internet Modulates and demodulates the signal Converts analog data into digital and vice versa V.90/V.92 56K standards.

Communication Systems I. How can information flow from point A to point B?

Chapter 7 Networking: Computer Connections. Networks n Network - a computer system that uses communications equipment to connect two or more computers.

Chapter 11 - Long-Distance Digital Connection Technologies Introduction Digital telephony Digitizing voice Example Sampling parameters Synchronous communication.

CSCI 465 D ata Communications and Networks Lecture 12 Martin van Bommel CSCI 465 Data Communications & Networks 1.

3.7 DIGITAL SUBSCRIBER LINE After traditional modems reached their peak data rate, telephone companies developed another technology, DSL, to provide higher-speed.

Computer Networks Digital Access Technologies. Spring 2006Computer Networks2 How Computer Networks are Built?  LANs (Local Area Networks) are relatively.

Computer Communication & Networks Lecture # 05 Physical Layer: Signals & Digital Transmission Nadeem Majeed Choudhary

Digital Transmission Outlines:- Multiplexing FDM TDM WDM

Using Telephone and Cable Networks

BZUPAGES.COM 4.1 Chapter 4 Digital Transmission Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.

Kashif BashirWWW.Taleem.greatnow.com Chapter 4 Digital Transmission.

Network Recap. First a recap on networks What is a stand alone PC What is a LAN Name 5 advantages of a LAN What is a WAN Name 1 advantage and 1 disadvantage.

Chapter 4 Digital Transmission Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.

AS Computing Data transmission. Basic data transmission Baud The rate that the voltage changes is called the Baud. If the voltage changes 10 times every.

Digital Interfaces An interface links two devices Interface Standards define: – mechanical specifications - how many wires & connector type –electrical.

McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Excerpts from Slides of Chapter 4 Forouzan Digital Transmission.

Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved. McGraw-Hill Technology Education Chapter 7B Data Communications.

McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Chapter 4 Digital Transmission.

A Level Computing for AQA Teacher’s Resource CD-ROM 20 CHAPTER: Communication methods Serial and parallel communications, bandwidth, bit rate and baud.

THEIR TRANSMISSION SPEEDS..

COMPUTER NETWORKING 2 LECTURE 3: BROADBAND TECHNOLOGY & DSL.

McGraw-Hill©2003 The McGraw-Hill Companies, Inc. Chapter 6 Physical Layer.

1 Kyung Hee University Chapter 9 Using Telephone and Cable Networks for Data Transmission.

NET 222: COMMUNICATIONS AND NETWORKS FUNDAMENTALS ( NET 222: COMMUNICATIONS AND NETWORKS FUNDAMENTALS (PRACTICAL PART) Tutorial 5 : Chapter 8 Data & computer.

Copyright © 2006 Heathkit Company, Inc. All Rights Reserved Introduction to Networking Technologies Digital Subscriber Line (DSL)

Communication Systems I CPE 313: Micro Processors and Interfacing.

Feb. 2, 2004 Prof. Paul Lin 1 CPET The Physical Layer - Signal Encoding & Modems Paul I-Hai Lin, Professor Electrical and Computer Engineering Technology.

McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 Physical Layer Summary Data-to-Signal Digital-to-Analog (Modem) Analog-to-Analog (Modem) Digital-to-Digital.

Chapter 4 Digital Transmission Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.

Data Communications: The Basics Chapter 4 The Management of Telecommunications Houston H. Carr and Charles A. Snyder.

Lecture 4 Continuation of transmission basics Chapter 3, pages 75-96

Presentation transcript:

Communication Systems I CPE 313: Micro Processors and Interfacing

How can information flow from point A to point B?

Morse Code Can you spell your name? See for a live demohttp://morsecode.scphillips.com/jtranslator.html

Morse Code in Hollywood 1996 Film

Fountain of Bits

How to transmit voice? Speaker = Sound reproducer Mic = Sound transducer Max Frequency Range: 20-20,000 Hz Electrical signal in a transmission line

How Are Phone Connected?

How are phone conversations connected? Traditional Switched Network Each conversation needs a dedicated line. Very expensive to build the network.

Using Multiplexing Techniques Frequency Division Multiplexing (FDM) Many connections can be multiplexed through a single line

Freqeuncy Channels

Traditional Telephone Lines Limit the Sound Frequencies Transmitted 400 – 3,400 Hz The bandwidth of this line is 3kHz Can you think of why?

Frequency Channels If the main transmission line has a maximum bandwidth of 1MHz, How many concurrent phone connections can it carry?

What if we want to send digital data over the phone line? Can it be done?

Digital to Analog Encoding See for an interactive demo.

Example: A Traditional Modem Modem Typical Maximum Speed 56Kbps

How data is sent with a traditional modem Traditional Modem Telephone Network Home Internet Gateway Destination Phone

Example II: ADSL Modem ADSL

Why is ADSL much faster? 256 Channels of 4 kHz each

But What About the 4K Bandwidth Limitation? Splitter ADSL Modem DSLAM Telephone Network Data Network Home Digital Subscriber Line Access Multiplexer

How fast is ADSL? ADSL = 256 x 4 kHz x 8 bits = 8 Mbps ADSL2= 12 Mbps ADSL2+= 25 Mbps *ADSL2+ expands channel frequency from 1.1 to 2.2 MHz

Serial vs Parallel Transmission Image © Quatec

Example of Serial Comm? Example of Parallel Comm?

Which Mode is More Common? Cost. Less cables. Smaller size. Simplicity. Keeping bits aligned in a high- speed parallel line requires more complex electronics. Serial Why?

The Need for Speed Speed Mbps

Synchronous vs Asynchronous A B A B Synchronous uses a clock line Asynchronous relies on a common clock on each side

Playing Catch with a Blind Receiver If you are the blind catcher, which method would you choose? Method 1: Pitcher throws and sends a signal Method 2: Pitcher throws every 10 seconds. No signal. Pitcher Catcher

RS-232 (Serial Communication) Baud Rate Data bits Start bit / Stop bits Parity

RS-232 Pulses Letter “V” ASCII = 86 ( ) 9600 bps, 8-N-1 Layout: Start Bit, Data Bits, Parity, Stop Bits * Note: Rs-232 logic pulses are inverted

RS-232 Pulses Letter “Y” ASCII = 89 ( ) 9600 bps, 8-Odd-1 Layout: Start Bit, Data Bits, Parity, Stop Bits * Note: Rs-232 logic pulses are inverted

How about ASCII 255? Layout: Start Bit, Data Bits, Parity, Stop Bits The data transmission is unbalanced. Can cause transmission errors bps, 8-N-1

Manchester Encoding (IEEE 802.3) Bit 1 = Low to High Bit 0 = High to Low

Example Image: Wikipedia

Data = 255 Manchester Code

Encode the following transmissions using the Manchester standard Letter “V” ASCII = 86 ( ) Letter “Y” ASCII = 89 ( )