ADSL - Intranet
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Transcript ADSL - Intranet
Asymmetric Digital Subscriber Line
Tutorial Slide Show
Tutorial Outline
What Is ADSL ?
What Can ADSL Do ?
How Does It Work ?
Architectural Options
Status of the Technology
The Future
ADSL Equipment
Standard Telephone Lines
Central Office Building
Residential
Customer
ADSL Rack
of Line Cards
Customer
Premises
Equipment
Remote ADSL
Unit
Data & Telephony on One Line
Data as ATM Cells &/or IP Packets
TV
Fast
Internet
All in Addition to Existing Analogue Telephony
“Evolution of Digital Access”
Pure Fibre
Hybrid Fibre/Copper
FTTH
Enhanced
Copper
FTTx +
VDSL
Today
ADSL
Voiceband
Modem
ISD
N
“Tomorrow’s Network” : ADSL
Video Servers
ADSL
Internet
Broadband
Network
1.5 to 8Mbit/s
9.6 to 640kbit/s
Telephone
Network
Live
Broadcast
Typical Network Construction
Central Office
Street Cabinet
Feeder Network
Distribution Network
Underground
Feed
Overhead
Feed
Next Topic
What Is ADSL ?
What Can ADSL Do ?
How Does It Work ?
Architectural Options
Status of the Technology
The Future
ADSL Applications
Internet Access, etc.
LAN Access (Teleworking)
Distance Learning
Broadcast TV
Home Shopping
Video On Demand
Next Topic
What Is ADSL ?
What Can ADSL Do ?
How Does It Work ?
Architectural Options
Status of the Technology
The Future
How Does ADSL Work?
Functional Elements
Use of Bandwidth
Channel Separation & POTS Splitter
Transmission Methods
Discrete Multi-tone Modulation (DMT)
Quadrate Amplitude Modulation (QAM)
Carrierless Amplitude/phase
Modulation (CAP)
ADSL Modem Structure
Mbit/s
kbit/s
Mbit/s
ADSL
Modem
ADSL
Modem
Line
POTS
Filter
POTS
Filter
POTS
Linecard
Exchange End
Customer End
kbit/s
ADSL Modem Functions
Digital
Interface
Transmission Convergence
Physical Media Dependent
Rates/multiplexing
Forward Error Control (FEC)
Framing/mapping
Protocol processing
OAM processing
Line Code (modulation)
Initialisation
POTS splitter/interface
Scrambler/descrambler
Base EOC functions
Alternatives
Alternatives
Bit Synchronous (STM)
Packet Mode
ATM Mode
DMT
QAM
CAP
Baseband
Line
Interface
Growth in Bandwidth Utilization
VDSL
~1997/8?
Time
ADSL
~1994
~1990
~1986
HDSL
ISDN
~0.1 MHz
~0.5 MHz
~1 MHz
Bandwidth (MHz)
10+ MHz
Next Topic
What Is ADSL ?
What Can ADSL Do ?
How Does It Work ?
Architectural Options
Status of the Technology
The Future
Data-Centric Architecture
10 base T
Ethernet
CPE
ADSL
or PC Remote
10 base T
Ethernet
ADSL
Linecard
45 or 155
Mbit/s
Ethernet
Hub/Switch
Router
10 base T
or
100 base T
ATM
or FR
ISP
Telecom-Centric
Architecture
ATM
e.g. 25 Mbit/s
CPE
e.g. PC
or STB
ADSL
Remote
155 Mbit/s
fibre
ADSL
Linecard
ADSL
Access
Mux
ATM
ISP
Next Topic
What Is ADSL ?
What Can ADSL Do ?
How Does It Work ?
Architectural Options
Status of the Technology
The Future
Status of ADSL Technology
Equipment
Standards
Trials
ADSL Equipment Trends
More Choice of Transceiver Chips and
Equipment
Increased Transceiver Integration
More Transceivers Per Line Card and
Equipment Rack
More Customers Per Exchange Transceiver
Faster Transmission Speeds
Increased Embedded Internetworking
Functionality
Standards and
Recommendations
ANSI
ETSI
ADSL FORUM
DAVIC
ATM FORUM
ITU
ADSL Activities
Throughout the World
ADSL Activities in the USA
ADSL Activities in Asia & Australasia
ADSL Activities in Europe
Next Topic
What is ADSL ?
What can ADSL do ?
How does it work ?
Architectural Options
Status of the technology
The Future
Broadband Network
Broadband Switch Network (eg. ATM)
Service Providers
High-Capacity Backbone Links
Servers
&
Billing
Operational
Support System
ADSL
Access Network
New Optical
Cable
Local Exchange
VDSL
POTS
“Evolution of Digital Access”
Pure Fibre
Hybrid Fibre/Copper
FTTH
Enhanced
Copper
FTTx +
VDSL
Today
ADSL
Voiceband
Modem
ISD
N
Asymmetric Digital Subscriber Line
Introduction Slide Show
Thank You for watching!