# Public Switched Telephone System

Size: px
Start display at page:

Transcription

1 Public Switched Telephone System Structure of the Telephone System The Local Loop: Modems, ADSL Structure of the Telephone System (a) Fully-interconnected network. (b) Centralized switch. (c) Two-level hierarchy. 1

2 Structure of the Telephone System (2) A typical circuit route for a medium-distance call. Major Components of the Telephone System Local loops Analog twisted pairs going to houses and businesses Trunks Digital fiber optics connecting the switching offices Switching offices Where calls are moved from one trunk to another 2

3 The Local Loop: Modems, ADSL, and Wireless The use of both analog and digital transmissions for a computer to computer call. Conversion is done by the modems and codecs. Analog Signalling Analog signalling consists of varying a voltage with time to send information If the transmission media was perfect No problem Transmitted signal Received Signal Three major problems Attenuation - Loss of energy as the signal propagates (db in km) Depends on frequency -- Different Fourier components attenuate differently Distortion different Fourier components propagate at different speeds Noise Unwanted energy from sources other than the transmitter Thermal noise Cross talk Impulse noise 3

4 Modems Different amplitudes to represent 0 and 1 Different frequencies are used Wave is shifted systematically 0 or 180 degrees at uniformly spaced intervals. (a) A binary signal (b) Amplitude modulation 45, 135, 225, 315 can be used to send 2 bits (c) Frequency modulation (d) Phase modulation Modems (2) To have higher speeds we cannot increase the sampling rate Nyquist theorem Max data rate = 2H log 2 V bits/sec H bandwidth (Hz) V discrete levels of signal If you have 3000 Hz perfect channel do not sample faster than 6000 Hz The number of samples per second is baud During each baud a symbol is sent 4

5 Modems (3) n-baud line transmits n symbols/sec 2400 baud line sends one symbol about every µsec If the symbol consists of 0 and 1 volts for 0 and 1 the bitrate is 2400 bps If each symbol consists of 2 bits 2400 baud line transmits 2400 symbols/sec at a data rate of 4800 bps Modulation is used to increase the number of bits/symbol Modems (4) Transmit 9600 bps over a 2400 baud line Same amplitude 4 phases 4 amplitude, 4 phases 16 amplitude, 4 phases (a) QPSK (Quadrature Phase Shift Keying) (b) QAM-16 (Quadrature Amplitude Modulation) (c) QAM-64. 5

6 Modems (5) Each modem standard has its own constellation diagrams When we have more points even a small noise can result in errors To reduce the chance of error use error correction by adding extra bits to each sample Trellis Coded Modulation (TCM) Modems (6) (a) (b) (a) V.32 for 9600 bps. (b) V32 bis for 14,400 bps. (QAM-128) 6 data + 1 parity bit 6

7 Modems (7) V bps at 2400 baud with 12 bits/symbol V.34 bis bps at 2400 baud with 14 bits/symbol Modems test the line before sending to adjust speed All modems allow traffic in both directions at the same time full duplex Half duplex Simplex Shannon limit for telephone system is about 35 kbps Determined by the average length of the local loops Maximum number bits/sec= H log 2 (1+S/N) Maximum data rate achievable is 70 kbps 7

8 Where does 56K modem come from? Nyquist theorem Modems 56Kbps Cable TV 10 Mbps Satellite 50 Mbps Sthg competitive needed broadband xdsl (Digital Subscriber Line) Asymmetric DSL (ADSL) Do not filter out below 300Hz and above 3400Hz effectively use 4000Hz Connect to a different switch The capacity is bounded by Length Thickness General quality 8

9 If you want 50 Mbps you need to move closer to the end office. Using mini end points EXPENSIVE! Bandwidth versus distanced over category 3 UTP for DSL. xdsl design goals The services must work over the existing category 3 twisted pair local loops They must not affect customers existing telephones and fax machines They must be much faster than 56Kbps They should be always on, with just a monthly charge instead of per-minute charge 9

10 DMT (Discrete MultiTone) Divide the spectrum available (1.1 Mhz) into 256 independent channels of Hz each Channel 0 is used for POTS Channels 1-5 are not used seperate voice and data channles from interfering 1 channel is used for upstream and downstream control 249 are used for data %80-90 are for downstream and remaining for upstream Asymmetric Operation of ADSL using discrete multitone modulation. 10

11 ADSL allows 8Mbps downstream and 1Mbps upstream Within each channel a modulation scheme similar to V.34 is used but the sampling rate is 4000 baud instead of 2400 baud. Different channels may have different data rates Example QAM modulation with 15 bits per baud 224 downstream channels 4000 x 15 x 224 = Mbps In practice, SNR is never good enough but 8Mbps is possible on short runs over high quality loops. A typical ADSL equipment configuration. 11

### Data Transmission. Data Communications Model. CSE 3461 / 5461: Computer Networking & Internet Technologies. Presentation B

CSE 3461 / 5461: Computer Networking & Internet Technologies Data Transmission Presentation B Kannan Srinivasan 08/30/2012 Data Communications Model Figure 1.2 Studying Assignment: 3.1-3.4, 4.1 Presentation

### Unit of Learning # 2 The Physical Layer. Redes de Datos Sergio Guíñez Molinos sguinez@utalca.cl 1-2009

Unit of Learning # 2 The Physical Layer Redes de Datos Sergio Guíñez Molinos sguinez@utalca.cl 1-2009 The Theoretical Basis for Data Communication Sergio Guíñez Molinos Redes de Computadores 2 The Theoretical

### EECC694 - Shaaban. Transmission Channel

The Physical Layer: Data Transmission Basics Encode data as energy at the data (information) source and transmit the encoded energy using transmitter hardware: Possible Energy Forms: Electrical, light,

### Chapter 2 from Tanenbaum - modified. The Physical Layer. Ref: A.S. Tanenbaum, Computer Networks, 4 th Ed., Prentice-Hall, 2003, ISBN: 0-13-038488-7.

Chapter 2 from Tanenbaum - modified The Physical Layer Ref: A.S. Tanenbaum, Computer Networks, 4 th Ed., Prentice-Hall, 2003, ISBN: 0-13-038488-7. Data Communications over Wireless and Digital Wired Systems

### (Refer Slide Time: 2:10)

Data Communications Prof. A. Pal Department of Computer Science & Engineering Indian Institute of Technology, Kharagpur Lecture-12 Multiplexer Applications-1 Hello and welcome to today s lecture on multiplexer

### Chapter 9 Using Telephone and Cable Networks for Data Transmission

9-11 TELEPHONE NETWORK Chapter 9 Using Telephone and Cable Networks for Data Transmission 1 McGraw-Hill Copyright The McGraw-Hill Companies, Inc. Permission required The for reproduction McGraw-Hill or

### Next Generation of High Speed. Modems8

Next Generation of High Speed Modems High Speed Modems. 1 Traditional Modems Assume both ends have Analog connection Analog signals are converted to Digital and back again. Limits transmission speed to

### Evolution from Voiceband to Broadband Internet Access

Evolution from Voiceband to Broadband Internet Access Murtaza Ali DSPS R&D Center Texas Instruments Abstract With the growth of Internet, demand for high bit rate Internet access is growing. Even though

### Analog vs. Digital Transmission

Analog vs. Digital Transmission Compare at two levels: 1. Data continuous (audio) vs. discrete (text) 2. Signaling continuously varying electromagnetic wave vs. sequence of voltage pulses. Also Transmission

### ADSL part 2, Cable Internet, Cellular

ADSL part 2, Cable Internet, Cellular 20 June 2016 Lecture 12 20 June 2016 SE 428: Advanced Computer Networks 1 Topics for Today ADSL Cable Internet Cellular Radio Networks 20 June 2016 SE 428: Advanced

### T = 1 f. Phase. Measure of relative position in time within a single period of a signal For a periodic signal f(t), phase is fractional part t p

Data Transmission Concepts and terminology Transmission terminology Transmission from transmitter to receiver goes over some transmission medium using electromagnetic waves Guided media. Waves are guided

### Physical Layer. Communication Satellites. ECE 453 Introduction to Computer Networks. Lecture 3 Physical Layer II

ECE 453 Introduction to Computer Networks Lecture 3 Physical Layer II 1 Physical Layer Services transmit bits from sender to receiver. Transmission media Guided: twisted pair, coax, fiber Unguided (wireless):

### How To Encode Data From A Signal To A Signal (Wired) To A Bitcode (Wired Or Coaxial)

Physical Layer Part 2 Data Encoding Techniques Networks: Data Encoding 1 Analog and Digital Transmissions Figure 2-23.The use of both analog and digital transmissions for a computer to computer call. Conversion

### Chap#5 (Data communication)

Chap#5 (Data communication) Q#1: Define analog transmission. Normally, analog transmission refers to the transmission of analog signals using a band-pass channel. Baseband digital or analog signals are

### 1. (Ungraded) A noiseless 2-kHz channel is sampled every 5 ms. What is the maximum data rate?

Homework 2 Solution Guidelines CSC 401, Fall, 2011 1. (Ungraded) A noiseless 2-kHz channel is sampled every 5 ms. What is the maximum data rate? 1. In this problem, the channel being sampled gives us the

### :-------------------------------------------------------Instructor---------------------

Yarmouk University Hijjawi Faculty for Engineering Technology Computer Engineering Department CPE-462 Digital Data Communications Final Exam: A Date: 20/05/09 Student Name :-------------------------------------------------------Instructor---------------------

### Black Box Explains: DSL

Black Box Explains: DSL History It was realized as early as the late eighties, early nineties, that conventional data transmission systems did not meet the requirements of the growing internet community

### Data Transmission. Raj Jain. Professor of CIS. The Ohio State University. Columbus, OH 43210 Jain@ACM.Org http://www.cis.ohio-state.

Data Transmission Professor of CIS Columbus, OH 43210 Jain@ACM.Org http://www.cis.ohio-state.edu/~jain/ 2-1 Overview Time Domain and Frequency Domain Bit, Hertz Decibels Data vs Signal Attenuation, Delay

### Fundamentals of Telecommunications

Fundamentals of Telecommunications Professor of CIS Columbus, OH 43210 Jain@ACM.Org http://www.cis.ohio-state.edu/~jain/ 1 Overview Time Division Multiplexing T1, T3, DS1, E1 T1 Framing Echo Cancellation

### Lecture 3: Signaling and Clock Recovery. CSE 123: Computer Networks Stefan Savage

Lecture 3: Signaling and Clock Recovery CSE 123: Computer Networks Stefan Savage Last time Protocols and layering Application Presentation Session Transport Network Datalink Physical Application Transport

### Digital Subscriber Line (DSL) Transmission Methods

Digital Subscriber Line (DSL) Transmission Methods 1. Overview... 1 2. SHDSL Transmission Methods... 1 SHDSL Transmission System Versions... 1 SHDSL Transmission Subsystem Structure... 1 SHDSL Modulation

### Digital Subscriber Line (DSL)

CHAPTER 9 This chapter describes the level of support that Cisco ANA provides for DSL, as follows: Technology Description, page 9-1 Inventory and Information Model Objects (IMOs), page 9-2 Vendor-Specific

### Intel System Engineers Documents. DSL General Overview

Intel System Engineers Documents DSL General Overview Alex Lattanzi SC LAR Whatt IIs Brroadband? Broadband describes a number of different technologies that deliver digital data to homes and businesses

### INTERNET CONNECTIVITY

INTERNET CONNECTIVITY http://www.tutorialspoint.com/internet_technologies/internet_connectivity.htm Copyright tutorialspoint.com Here in this tutorial, we will discuss how to connect to internet i.e. internet

### Computer Networks PHY

Computer Networks The Physical Layer 1 PHY Transmitting information on wires. How is information represented? Digital systems. Analog systems. 2 What is a signal? What is a system? Signals and Systems

### Physical Layer. Computer Networks. Transmitting Signals (1/2) Analog vs. Digital. Paolo Costa costa@cs.vu.nl http://www.cs.vu.

Physical Layer Computer Networks Physical Layer Paolo Costa costa@cs.vu.nl http://www.cs.vu.nl/ costa Vrije Universiteit Amsterdam Provide the means to transmit bits from sender to receiver involves a

Lecture 7 Access to Data & Computer Networks Physical Level Serial Interface RS232C, RS232D RS449, X21 Modem Traditional Modem Intelligent modem Wireless Modem Digital Telephony T1 & E1 Systems SONET/SDH

### Data Transmission via Modem. The Last Mile Problem. Modulation of Digital Signals. Modem Standards (CCITT)

The Last Mile Problem LN, MN, WN how to connect private users at home to such networks? Problem of the last mile: somehow connect private homes to the public Internet without laying many new cables By

### Broadband 101: Installation and Testing

Broadband 101: Installation and Testing Fanny Mlinarsky Introduction Today the Internet is an information superhighway with bottlenecks at every exit. These congested exits call for the deployment of broadband

### How DSL Works. by Curt Franklin

by Curt Franklin How DSL Works When you connect to the Internet, you might connect through a regular modem, through a localarea network connection in your office, through a cable modem or through a digital

Microprocessors and Microsystems 22 (1999) 605 610 Broadcast digital subscriber lines using discrete multitone for broadband access K.-P. Ho* Department of Informational Engineering, The Chinese University

### CARLETON UNIVERSITY Department of Systems and Computer Engineering. SYSC4700 Telecommunications Engineering Winter 2014. Term Exam 13 February 2014

CARLETON UNIVERSITY Department of Systems and Computer Engineering SYSC4700 Telecommunications Engineering Winter 2014 Term Exam 13 February 2014 Duration: 75 minutes Instructions: 1. Closed-book exam

### Introduction to Digital Subscriber s Line (DSL)

Introduction to Digital Subscriber s Line (DSL) Professor Fu Li, Ph.D., P.E. Chapter 3 DSL Fundementals BASIC CONCEPTS maximizes the transmission distance by use of modulation techniques but generally

### Introduction to ADSL. NEXTEP Broadband White Paper. Broadband Networks Group. A primer on Asymmetric Digital Subscriber Line transmission technology.

NEXTEP Broadband White Paper Introduction to ADSL A primer on Asymmetric Digital Subscriber Line transmission technology. A NEXTEP Broadband White Paper May 2001 Broadband Networks Group Introduction to

### CS423: Lectures 2-4, Physical Layer. George Varghese. April 16, 2008

CS423: Lectures 2-4, Physical Layer George Varghese April 16, 2008 What does the Physical Layer Do? bits SENDER PHYSICAL LAYER RECEIVER 1 RECEIVER 1 RECEIVER 1 A possibly faulty, single-hop, bit pipe that

Residential Broadband: Technologies for High-Speed Access To Homes Columbus, OH 43210 Jain@CIS.Ohio-State.Edu http://www.cis.ohio-state.edu/~jain/cis788-97/ Email questions to mbone@netlab.ohio-state.edu

### www.zte.com.cn VDSL2 A feasible Solution for Last Mile

www.zte.com.cn VDSL2 A feasible Solution for Last Mile Version Date Author Approved By Remarks V1.00 009-08-8 MichaelSong Not open to the Third Party 009 ZTE Corporation. All rights reserved. ZTE CONFIDENTIAL:

### Long Distance Connection and WAN

Lecture 6 Long Distance Connection and WAN Digital Telephone, PCM and Nyquist Sampling Theorem DSU/CSU, T Line Series and OC line Series Local Loop DSL Technologies - ADSL, HDSL, SDSL, VDSL Cable Modem

### How To Get A Phone In The United States

Telephone Systems COMP476 Home Telephones Plain Old Telephone Service (POTS) provides a twisted pair connection from your phone to the central office. You own your home wiring and the telephone company

### Digital Modulation. David Tipper. Department of Information Science and Telecommunications University of Pittsburgh. Typical Communication System

Digital Modulation David Tipper Associate Professor Department of Information Science and Telecommunications University of Pittsburgh http://www.tele.pitt.edu/tipper.html Typical Communication System Source

### Lecture 5-7 Communication Technologies and their Applications

Computer Communications Lecture 5-7 Communication Technologies and their Applications The Physical Layer Transport a raw bit stream from one machine to another Physical media characterized by bandwidth,

### TELECOMMUNICATIONS STANDARDS ADVISORY COMMITTEE WORKING GROUP ON COMMON CONNECTION STANDARDS (CCS)

TELECOMMUNICATIONS STANDARDS ADVISORY COMMITTEE WORKING GROUP ON COMMON CONNECTION STANDARDS (CCS) Overview of Very High Speed Digital Subscriber Line 2 (VDSL2) 甚 高 速 數 碼 用 戶 線 路 2 的 概 覽 Introduction ADSL

By M. V. Ramana Murthy All Rights Reserved COPYRIGHT: This document is a property of MultiTech Software Systems India Pvt. Ltd. No part of this document may be copied or reproduced in any form or by any

### Network Requirements for DSL systems, (ADSL through G.Fast) (A summarized view)

Network Requirements for DSL systems, (ADSL through G.Fast) (A summarized view) Gilberto GG Guitarte, BB Connectivity Director TE Connectivity FTTH LATAM Chapter CHAIRMAN 2/24/2014 G.A.Guitarte 1 Executive

### xdsl Tutorial By Brandon Provolt Engineering Intern Marketing and Product Development Group Schott Corporation Version 0.53 (beta) August 2000

xdsl Tutorial By Brandon Provolt Engineering Intern Marketing and Product Development Group Schott Corporation Version 0.53 (beta) August 2000 Contents 1 General Information 1.1 Introduction 1.2 What is

### Telecommunications systems (Part 1)

School of Business Eastern Illinois University Telecommunications systems (Part 1) (Week 11, Thursday 11/02/2006) Abdou Illia, Fall 2006 Learning Objectives 2 Describe and compare types of connection to

### Telecommunications systems (Part 2)

School of Business Eastern Illinois University Telecommunications systems (Part 2) Abdou Illia, Spring 2007 (Week 12, Thursday 3/29/2007) T-1 Digital Subscriber Line (DSL) Cellular Telephone System Integrated

### What s The Difference Between Bit Rate And Baud Rate?

What s The Difference Between Bit Rate And Baud Rate? Apr. 27, 2012 Lou Frenzel Electronic Design Serial-data speed is usually stated in terms of bit rate. However, another oftquoted measure of speed is

### An Analysis of Speed Drop in ADSL Lines in Sri Lanka

An Analysis of Speed Drop in ADSL Lines in Sri Lanka CPSY Dalpathadu # and PN Karunanayaka General Sir John Kotelawala Defence University, Ratmalana, Sri Lanka # sach.yamani@gmail.com Abstract: This paper

### How To Get High Speed Internet In Australia

ADSL vs Cable Cable subscribers are connected directly to high speed lines while ADSL subscribers are connected directly to medium speed lines Cable subscribers share the line connecting them to neighbourhood

### ECE 510 -- Chapter 1

ECE 510 -- Chapter 1 Definition: Digital Subscriber Line (DSL) Public network technology that delivers high bandwidth over conventional copper wiring at limited distances. There are four major types of

### Nexus Technology Review -- Exhibit A

Nexus Technology Review -- Exhibit A Background A. Types of DSL Lines DSL comes in many flavors: ADSL, ADSL2, ADSL2+, VDSL and VDSL2. Each DSL variant respectively operates up a higher frequency level.

### Simulation Study on Internet Applications over DSL Access Network: KFUPM Campus as an Example

Simulation Study on Internet Applications over DSL Access Network: KFUPM Campus as an Example Uthman Baroudi, Saeed Bawazir and Wael Hamri Computer Engineering Department KFUPM, Dhahran Saudi Arabia Email:

### How To Understand The Theory Of Data Communication

ICOM 5026-090: Computer Networks Chapter 2: The Physical Layer By Dr. Yi Qian Department of Electronic and Computer Engineering Fall 2006 Outline The Theoretical Basis for Data Communication Guided transmission

### Evaluation Criteria for ADSL AFE1302

Application Report SBAA095 - August 2003 Evaluation Criteria for ADSL AFE1302 John Z. Wu and CR Teeple High Speed Products Marketing ABSTRACT This paper describes several important asymmetrical digital

### ADSL or Asymmetric Digital Subscriber Line. Backbone. Bandwidth. Bit. Bits Per Second or bps

ADSL or Asymmetric Digital Subscriber Line Backbone Bandwidth Bit Commonly called DSL. Technology and equipment that allow high-speed communication across standard copper telephone wires. This can include

### Narrowband and Broadband Access Technologies

Computer Networks and Internets, 5e Chapters 12 and 16 Access and Interconnection Technologies (slidesets abridged/combined) By Douglas Comer Modified from the lecture slides of Lami Kaya (LKaya@ieee.org)

### TCOM 370 NOTES 99-6 VOICE DIGITIZATION AND VOICE/DATA INTEGRATION

TCOM 370 NOTES 99-6 VOICE DIGITIZATION AND VOICE/DATA INTEGRATION (Please read appropriate parts of Section 2.5.2 in book) 1. VOICE DIGITIZATION IN THE PSTN The frequencies contained in telephone-quality

### Characterization of a new copper cable for next generation DSL systems

la The Tour Marine Tanguy, Drive,, Brest Mumbai. (FR). Characterization of a new copper cable for next generation DSL systems Project Co-ordinates ordinates Kalpesh PATEL TELECOM ParisTech Paris, France.

### Broadband access. Nils Holte, NTNU. NTNU Department of Telecommunications Kursdagene ved NTNU, Digitale telenett, 9. januar 2002 1.

Broadband access - properties of the copper network Nils Holte, Kursdagene ved, Digitale telenett, 9. januar 2002 1 Definition of broadband Overview Alternatives for fixed broadband access pair cable,

### 2-Pair. Managed SHDSL Ethernet Extender. User s Manual

2-Pair User s Manual 1. Quick Start Guide This quick start guide describes how to install and use the Managed SHDSL Ethernet Extender. This is the Ethernet Extender of choice to extend 10/100 Ethernet

### Chapter 13: Internet Connectivity

Chapter 13: Internet Connectivity Complete CompTIA A+ Guide to PCs, 6e To configure an internal external modem To explain basic handshaking between a DTE device and a DCE device To use Windows tools when

### Analysis of xdsl Technologies

International Journal of Electronics and Computer Science Engineering 897 Available Online at www.ijecse.org ISSN- 2277-1956 Analysis of xdsl Technologies Dimple Saproo 1, Megha Goyal 2, Asha Bhagashra

### VDSL (VERY HIGH DATA BIT RATE DIGITAL SUBSCRIBER LINE)

1 VDSL (VERY HIGH DATA BIT RATE DIGITAL SUBSCRIBER LINE) INTRODUCTION 1. Recent events in the telecommunications environment are giving rise to a new class of service providers, setting the stage for how

### XDSL and DSLAM Access Technologies

XDSL and DSLAM Access Technologies Abstract What are the differences between the different forms of xdsl technology, such as ADSL and HDSL? How are they implemented. What are the limitations? What are

### TELECOMMUNICATIONS STANDARDS ADVISORY COMMITTEE TSAC WORKING GROUP ON NEW STANDARDS AND POLICY (NSP)

TELECOMMUNICATIONS STANDARDS ADVISORY COMMITTEE TSAC WORKING GROUP ON NEW STANDARDS AND POLICY (NSP) Introduction Development of Digital Subscriber Line (DSL) Technology This paper introduces the development

### 10/13/2008 Vasile Dadarlat --Computer Networks 1

Lecture 4 Communications Channels Definition: the part that connects a data source to a data sink; based on the transmission media. Classification criteria: -type of the link (connection): point-to-point,

### Asymmetric Digital Subscriber Line (ADSL)

Asymmetric Digital Subscriber Line (ADSL) Definition Asymmetric digital subscriber line (ADSL) is a new modem technology that converts existing twisted-pair telephone lines into access paths for high-speed

### Chapter 9A. Network Definition. The Uses of a Network. Network Basics

Chapter 9A Network Basics 1 Network Definition Set of technologies that connects computers Allows communication and collaboration between users 2 The Uses of a Network Simultaneous access to data Data

### THE BCS PROFESSIONAL EXAMINATIONS BCS Level 5 Diploma in IT. October 2009 EXAMINERS' REPORT. Computer Networks

THE BCS PROFESSIONAL EXAMINATIONS BCS Level 5 Diploma in IT October 2009 EXAMINERS' REPORT Computer Networks General Comments The responses to questions were of marginally better quality than April 2009

### NEW WORLD TELECOMMUNICATIONS LIMITED. 2 nd Trial Test Report on 3.5GHz Broadband Wireless Access Technology

NEW WORLD TELECOMMUNICATIONS LIMITED 2 nd Trial Test Report on 3.5GHz Broadband Wireless Access Technology Issue Number: 01 Issue Date: 20 April 2006 New World Telecommunications Ltd Page 1 of 9 Issue

### 1.264 Lecture 32. Telecom: Basic technology. Next class: Green chapter 4, 6, 7, 10. Exercise due before class

1.264 Lecture 32 Telecom: Basic technology Next class: Green chapter 4, 6, 7, 10. Exercise due before class 1 Exercise 1 Communications at warehouse A warehouse scans its inventory with RFID readers that

### Module: Digital Communications. Experiment 784. DSL Transmission. Institut für Nachrichtentechnik E-8 Technische Universität Hamburg-Harburg

Module: Digital Communications Experiment 784 DSL Transmission Institut für Nachrichtentechnik E-8 Technische Universität Hamburg-Harburg ii Table of Contents Introduction... 1 1 The DSL System... 2 1.1

### DSL Variations. NEXTEP Broadband White Paper. Broadband Networks Group. Definitions and differences of Digital Subscriber Line variations.

NEXTEP Broadband White Paper DSL Variations Definitions and differences of Digital Subscriber Line variations. A NEXTEP Broadband White Paper May 2001 Broadband Networks Group DSL Variations EXECUTIVE

### Telecommunications, Networks, and Wireless Computing

Objectives Telecommunications, Networks, and Wireless Computing 1. What are the features of a contemporary corporate telecommunications system? On what major technology developments are they based? 2.

### Introduction to Digital Subscriber Line Technology

An Overview of Digital Subscriber Line Technology Technology basics, DSL equipment, types of DSL, comparison with cable, use by customers and ehealth support Introduction to Digital Subscriber Line Technology

### How To Define Hfc Technology

Cable network topologies and implications for evolutionary approaches 33 rd International conference and Exhibition PIKE 2008, Zakopane, 14 October 2008 Bart Brusse, ReDeSign Project Manager Pressure on

### Think! Think! Data communications. Long-Distance. Modems: to analog and back. Transmission Media. The last mile is the hardest for digital information

Data communications Think! Think!?? What makes it possible to communicate from point A to point B?? Long-Distance Transmission Media If you place a call outside the local transport area, an interchange

Broadband Technology Clinic Burlington Telecom Advisory Board 1 What are the Defining Characteristics of a Broadband Service? Speed - Throughput capability both down and upstream Performance - Latency

### Voice---is analog in character and moves in the form of waves. 3-important wave-characteristics:

Voice Transmission --Basic Concepts-- Voice---is analog in character and moves in the form of waves. 3-important wave-characteristics: Amplitude Frequency Phase Voice Digitization in the POTS Traditional

### Digital Subscriber Line

21 CHAPTER Chapter Goals Identify and discuss different types of digital subscriber line (DSL) technologies. Discuss the benefits of using xdsl technologies. Explain how ASDL works. Explain the basic concepts

### Cable Modems. Definition. Overview. Topics. 1. How Cable Modems Work

Cable Modems Definition Cable modems are devices that allow high-speed access to the Internet via a cable television network. While similar in some respects to a traditional analog modem, a cable modem

### ADSL TUTORIAL. Figure 1: Typical DSL system.

ADSL TUTORIAL Matthew J. Langlois, University of New Hampshire InterOperability Laboratory 121 Technology Drive, Suite 2, Durham, NH 03824 USA. Extracted from the Introduction and Chapter 1 of A G.hs Handshaking

### How Enhanced DSL Technologies Optimize the Last Copper Mile By John Williams

White Paper How Enhanced DSL Technologies Optimize the Last Copper Mile By John Williams As broadband speeds increase to support the connected home, a debate continues over which type of network architecture

### TCOM 370 NOTES 99-4 BANDWIDTH, FREQUENCY RESPONSE, AND CAPACITY OF COMMUNICATION LINKS

TCOM 370 NOTES 99-4 BANDWIDTH, FREQUENCY RESPONSE, AND CAPACITY OF COMMUNICATION LINKS 1. Bandwidth: The bandwidth of a communication link, or in general any system, was loosely defined as the width of

### Implementing Digital Wireless Systems. And an FCC update

Implementing Digital Wireless Systems And an FCC update Spectrum Repacking Here We Go Again: The FCC is reallocating 600 MHz Frequencies for Wireless Mics 30-45 MHz (8-m HF) 174-250 MHz (VHF) 450-960 MHz

Residential Broadband: Technologies for High-Speed Access To Homes The Ohio State University Columbus, OH 43210-1277 1277 http://www.cse.ohio-state.edu/~jain/ 1 Overview 56 kbps Modems, ISDN ADSL, VDSL

### Objectives. Lecture 4. How do computers communicate? How do computers communicate? Local asynchronous communication. How do computers communicate?

Lecture 4 Continuation of transmission basics Chapter 3, pages 75-96 Dave Novak School of Business University of Vermont Objectives Line coding Modulation AM, FM, Phase Shift Multiplexing FDM, TDM, WDM

### Detecting Bridged Tap and Noise Interference in VDSL2 Access Networks using the JDSU SmartClass TPS

Application Note Detecting Bridged Tap and Noise Interference in VDSL2 Access Networks using the JDSU SmartClass TPS The JDSU SmartClass TPS tester is the ideal tool for technicians who install, troubleshoot,

### Appendix A: Basic network architecture

Appendix A: Basic network architecture TELECOMMUNICATIONS LOCAL ACCESS NETWORKS Traditionally, telecommunications networks are classified as either fixed or mobile, based on the degree of mobility afforded

### Department of Electrical and Computer Engineering Ben-Gurion University of the Negev. LAB 1 - Introduction to USRP

Department of Electrical and Computer Engineering Ben-Gurion University of the Negev LAB 1 - Introduction to USRP - 1-1 Introduction In this lab you will use software reconfigurable RF hardware from National

### RADIO FREQUENCY INTERFERENCE AND CAPACITY REDUCTION IN DSL

RADIO FREQUENCY INTERFERENCE AND CAPACITY REDUCTION IN DSL Padmabala Venugopal, Michael J. Carter*, Scott A. Valcourt, InterOperability Laboratory, Technology Drive Suite, University of New Hampshire,

### Sampling Theorem Notes. Recall: That a time sampled signal is like taking a snap shot or picture of signal periodically.

Sampling Theorem We will show that a band limited signal can be reconstructed exactly from its discrete time samples. Recall: That a time sampled signal is like taking a snap shot or picture of signal

### Line Simulator (LiSi) for Asymmetric and Very High-Speed Digital Subscriber Line

Line Simulator (LiSi) for Asymmetric and Very High-Speed Digital Subscriber Line Nikolaos Choulakis, Research Masters in Telecommunications, University College London Abstract: A brief introduction describing

### New TV Technologies for Science Education. A.K. Bhatnagar Chief Engineer Doordarshan

New TV Technologies for Science Education A.K. Bhatnagar Chief Engineer Doordarshan Digital TV Delivery Platforms Digital Terrestrial TV Broadcasting Digital Cable TV IPTV Mobile TV DTH Satellite Digital

### During class please switch off your mobile, pager or other that may interrupt.

Intro to ADSL During class please switch off your mobile, pager or other that may interrupt. Course objectives: The trainee will understand the working principles of ADSL. The trainee will get an overview

### XDSL TECHNIQUES FOR POWER LINE COMMUNICATIONS

XDSL TECHNIQUES FOR POWER LINE COMMUNICATIONS Costas Assimakopoulos*, P.L. Katsis*, F.-N. Pavlidou*, Danilo Obradovic**, Milorad Obradovic** Abstract *Aristotle University of Thessaloniki Dept. of Elec.