In preparation for understanding DSL technology this introduction
covers the local loop bandwidth availability, modem principles,
modulation techniques and line codes. It also explains noise issues.
The xDSL Family
Outlines the differences between the DSL technologies and introduces
ADSL, HDSL, RADSL, VADSL, VDSL, and SDSL.
How ADSL Works
An in-depth look at ADSL technology, including ADSL bandwidth usage,
implementation, standardisation and the ADSL Infrastructure.
ADSL Framing and Encapsulation
Introducing the fast and interleaved frames and superframes.
Explains how the frame structure is used, especially for Voice
transmission. Also covers encapsulation modes, RFC 1483, L2
tunnelling and ATM mode.
A look at the enhanced standards - ADSL2, ADSL2+ and VDSL - to see
the progress made to give customers the high-speed connectivity in
Looking at security, multicasting, PVC and SVC support. Also
examining the infrastructure outlining the role of the DSLAM
(Digital Subscriber Line Access Multiplexer), the use of HFC (Hybrid
Fibre Coax) and its implementation.
A description of how SDSL operates technically and a look at the
structure and modulation methods used. Also a comparison of the ITU
standard and the ETSI standard.