Broadband Technologies and Applications: A Tutorial
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Transcript of Broadband Technologies and Applications: A Tutorial
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Broadband Technologies andApplications: A Tutorial
Presentation by
Dale N. HatfieldAdjunct Professor, University of Colorado at Boulder
at the
Wyoming Telecommunications ForumCasper, Wyoming
June 29, 2006
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Introduction
• Purpose:– To provide non-engineers with an overview of
major trends in telecommunications technology and to reflect briefly on the policy and regulatory implications of those trends
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Outline
• The Digital Revolution
• The Race for Broadband
• The Wireless Revolution
• The Role of the Internet, the Internet Protocols and “Intelligence at the Edge”
• Convergence and Its Implications
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The Digital Revolution
Time
Intensity
• Analog Signal
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• Digital Signal
The Digital Revolution
Time
Intensity
0 1 0 0 0 1 0 1 1 0 0
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1
The Digital Revolution
• Analog and Digital Networks
0 01 101 1 1 0 0 11 110100 01 010 0 011
Time
Digital Network: voice, data, image and video information carried as a sequence of ones and zeros represented by pulses of current or light or radio waves
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The Digital Revolution
• Analog to Digital and Digital to Analog Conversion
12.3 12.6 12.9 13.6 13.9 14.8 14.1 13.9
Analog Signal Analog Signal
A/D D/A
Sequence of Numbers (Transmitted as a Sequence of Binary Numbers)
On and Off Pulses Representing
Binary Numbers
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The Digital Revolution
• Why Digital?– Analog Amplification vs. Digital Regeneration
AMP AMPAMPINPUT OUTPUT
Digital Regeneration: “Perfect” Signal is Regenerated
Analog Amplification: Noise Accumulates
INPUTRepeater Repeater Repeater
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The Digital Revolution• Why Digital?
– Digital Regeneration
Repeater
-- Other Advantages (Examples):Ease of combining different kinds of signals (multiplexing)Rapid decline in costs and improvements inperformance of digital devices (“chips”)Ease of encryption
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The Race for Broadband
• What Is Bandwidth?– In simple terms, bandwidth is just a measure of
how fast information can be transmitted– The larger the bandwidth, the more information
that can be transmitted in a given amount of time – In the digital world, bandwidth is measured in
bits per second– Analogous measures: vehicles per hour or
gallons per minute
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The Race for Broadband
• What Is Bandwidth?– To over simplify:
• Voice requires only narrow bandwidths (narrowband)
• Still images require wide bandwidths (wideband)*
• Video requires broad bandwidths (broadband)
*For transmission of the image in a reasonable amount of time
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The Race for Broadband
• Illustration of the Importance of Bandwidth
Computer Monitor
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The Wireless Revolution
• What Is Spectrum?– “Spectrum” is a conceptual tool used to
organize and map a set of physical phenomena– Electric and magnetic fields produce
(electromagnetic) waves that move through space at different frequencies
– The set of all possible frequencies is called the “electromagnetic spectrum”
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The Wireless Revolution
• What Is Spectrum?– The subset of frequencies between 3,000 Hz
and 300 GHz is known as the “radio spectrum”– Note that radio waves do not require a medium
per se, that is, radio waves can travel through a vacuum (e.g., outer space)
Electromagnetic Spectrum
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The Wireless Revolution
• A Radio Communications Link
Transmitter Receiver
Antenna Antenna
Transmission Line Transmission Line
Radio Waves
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The Wireless Revolution
• Relationship Between Frequency and Wavelength
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The Wireless Revolution
• Characteristics of Different Frequencies– Some Factors Vary with Frequency
• How fast the wave weakens with distance
• Size of efficient antennas
• Ability of the waves to penetrate buildings
• Ability of the waves to penetrate through trees and other vegetation
• Reflectivity of various objects to the waves
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The Wireless Revolution• Modulation and Demodulation
– Transmitter and Receiver – Basic Building Blocks
MOD AMP DE-MODAMP
OSC
Transmitter
INFO
INFO
Receiver
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The Role of the Internet
Source: bchs.kearney.net/ BTales_198302.htm
Laura Robbins and Maud Ware at telephone switchboard 1910
• Telephone Switching
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The Role of the Internet• A Telephone Switchboard
Plugs and CordsJacks
Wire Pairs = N = 8
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The Role of the Internet• A Simple Telephone Switch – Manual or
Automatic
Controller
ServiceLogic
A
BCDEF
A B C D E F
Mind of the Operator“Intelligence”
(Service Layer)
Eyes, Ears, Limbs, Hands etc(Control Layer)
Switch “Matrix”(Transport Layer
Incoming Lines/Trunks
Outgoing Lines Trunks
Switch “Matrix”
Memory
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The Role of the Internet
Edge NetworkEdge
• A Telephone Exchange
ServicesControl
Transport
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The Role of the Internet
Edge• A Telephone Network
Edge Network
Service
Control
Transport
Service
Control
Transport
Exchange One Exchange Two
Interexchange, LD, or Toll Trunks
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The Role of the Internet
Telegraph Key and Sounder Image from: www.jerry-howell.com/ Telegraph.htmlTelegraph Relay Office Image from: http://www.coloradoplains.com/otero/souvenir/page23.htm
Telegraph Key and Sounder Telegraph Relay Office
• The Telegraph and Message Switching
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The Role of the Internet
TelegramTo: Joe Smith, AnytownFrom: Mary Jones, SometownText: Happy BirthdayMMM
TelegramTo: Joe Smith, AnytownFrom: Mary Jones, SometownText: Happy BirthdayMMM
TelegramTo: Joe Smith, AnytownFrom: Mary Jones, SometownText: Happy BirthdayMMM
• A Message Switch
Message Switch(Relay Office)
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The Role of the Internet• A Packet of Information
Header Text Text Trailer
Address, Priority,Packet Number, etc.
User Information Error DetectionCode etc.
(Redundant Bits)
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The Role of the Internet
Packet Switch orRouter
• A Packet Switch or Router
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The Role of the Internet
Node
Packet Switch orRouter
• A Packet Switched Network
Node
Packet Switch orRouter
To/From Other Nodes
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The Role of the Internet• The Internet As a “Cloud”
Internet – A PacketSwitched NetworkUsing the InternetProtocol Suite
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The Role of the Internet
• A Note on Latency and Quality of Service (QoS) – In simple terms, latency just refers to delay– Latency is the amount of time it takes
information (e.g., a packet) to travel from source to destination
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The Role of the Internet– In a packet switched network, latency is
associated with congestion produced by the inability of packet switches to process packets fast enough and/or by the lack of adequate transmission capacity (bandwidth) between packet switches
– In combination, latency and bandwidth define the speed and capacity of a network
– Low latency is critical in voice communications and certain “real-time” data communications applications (e.g., interactive games)
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The Role of the Internet
• Architecture of the Traditional Public Switched Telephone Network– Circuit switching– “Dumb” terminals with limited capabilities– “Intelligence” residing in switches, intelligent
peripherals, service control points, etc. interior to the network
– Services created inside the network
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The Role of the Internet
• Architecture of Networks Based Upon the Internet Protocol (IP)– Packet switching– “Dumb” network – “Intelligent” terminals (e.g., PCs) with a rich
set of capabilities – Services created in terminals/servers at the edge
of the network
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The Role of the Internet
Server
Internet – A PacketSwitched NetworkUsing the InternetProtocol Suite
Server
Server
Adapter
Gate-way
To Public SwitchedTelephone Network
• “Intelligence” at the “Edge” of the Network
PC/Client
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The Role of the Internet
• Network Trends/Goals from a Technological Perspective:– All applications -- voice, data, image, video,
multimedia -- conveyed on an all digital, packet-switched, broadband, low latency network or “platform”
– A “network of networks” platform that uses common, open, non-proprietary standards and protocols (e.g., the Internet Protocol -- IP)
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The Role of the Internet
• Network Trends/Goals from a Technological Perspective: (Cont’d)– Extension of this platform using wireless
technology to allow users to communicate anyplace, anytime, in any mode or combination of modes.
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The Role of the Internet
Customer Premises Access BackboneLocal/Regional
Customer Node Network Node
IP BasedNetwork
• Integrated Network with Integrated Access
Access Network: DSL,Cable Modem, Wireless (Cellular, Wi-Fi, etc), Satellite, Other
Integrated End User Device (Voice, Data, Video, Multimedia)
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Convergence• Traditional “Silos” of Service/Regulation
Title II
WirelineTelephony
Title III
WirelessTelephony
Title III
BroadcastRadio/TV
Title VI
CableTelevision
Common Carrier Bureau – Now the Wireline Competition Bureau
Wireless Telecommunications Bureau
Broadcast Bureau – Now Part of the Media Bureau
Cab;e Television Bureau – Now Part of the Mass Media Bureau
Sources: Newman, Whitt, Sicker, others
Note: Titles refer to the Communications Act of 1934 (as amended); Bureaus refer to organizational units within the FCC
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Convergence• Converged Networks Services
Applications
Voice, data, still image, video (telephony, email, WWW, video, etc.)
TCP/IP
(The Internet Protocol Suite)
Medium
Cable, wireless (3G, WiFi, WiMax),DSL, FTTH, etc.
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Contact Information
Dale N. HatfieldAdjunct ProfessorInterdisciplinary Telecommunications ProgramUniversity of Colorado at BoulderEngineering Center - ECOT-311Campus Box 530Boulder, CO 80309-0530Main Tel: +1 303-492-8916Direct Dial: +1 303-492-6648Fax: +1 303-492-1112Email: [email protected] [email protected]