Essay About Dsl Primer And Adsl Family

Dsl Primer
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Contents
Introduction
The Fundamental Problem of Communications
The Transmission Medium-Attenuation Constraints
The Transmission Medium- Interference Constraints
The Transmission Medium- Bandwidth Constraints
DSL Keeps Unshielded Twisted Pair (UTP) Copper Cable
Attractive as a Premises Transmission Medium
A Brief History of DSL
Program
xDSL Modems: Fundamentals and Flavors
The Simple DSL Transceiver
The Many Flavors of DSL
2.2.1
2.2.2
The HDSL Family: HDSL, SDSL, MSDSL and HDSL2
2.2.3
The ADSL Family: ADSL, MDSL, RADSL and
Splitterless DSL
2.2.4
The Role of DSLAMsers
Virtual DSL: The Role of the DSL Simulator
Standards
Digital Subscriber Line – DSL Glossary
Bibliography
Index of Illustrations
Figure 1-1
Source, User pair with information
Figure 1-2
Representations of information
Figure 1-3
Examples of sources and users generating/desiring “data”
Figure 1-4
Source, transmission medium, user
Figure 1-5
Disturbance travelling in transmission medium
Figure 1-6
The model which represents the fundamental problem of
Communications
Figure 1-7
Input data signal attenuating as it propagates down a
transmission medium
Figure 1-8
Regenerating and repeating an attenuated signal in order to
reach user
Figure 1-9
Example transfer function of a transmission medium
Figure 1-10
Binary data from source represented by impulse train put into
transmission medium by transmitter. Impulses are T seconds apart
Figure 1-11
Input signal is positive impulse. Resulting output signal shows
time dispersion
Figure 1-12
Cost trends of common transmission media
Figure 2-1
A typical DSL Transceiver block diagram
Figure 2-2
Transmitter of digital transmission system
Figure 2-3
Generic DSL Reference Model
Figure 2-4
T1 Components
Figure 2-5
The HDSL Architecture
Figure 2-6
Photo of Model 681/682 HDSL Modem
Figure 2-7
ADSL reference model
Figure 2-8
Conventional ADSL configuration with splitter
Figure 2-9
Photo of Model 684 MDSL Modem
Figure 2-10
The VDSL Architecture
Figure 3-1
DSL-based services reference diagram
Figure 4-1
Diagram of modem testing on local loop connection
Figure 4-2
Diagram of modem testing on coil of twisted pair cable
Figure 4-3
Diagram of modem testing on DSL Simulator
Figure 4-4
Photo of Model 454 – Local Loop Simulator
Figure 4-5
Photo of Model 455 – Local Loop Simulator
Figure 4-6
Photo of Model 457 – Automated Local Loop Simulator
Figure