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Training Course Outline

Wireline Telecom Courses ADSL DSL ADSL2+ Access Training Courses

DSL Access Techniques

Course Duration: 2 days

Course Code: PWL035

Course Description:

This two-day course covers DSL access techniques using ADSL/ADSL2+, TR-101, PPPoE, PPPoA, VLANs and IEEE 802 Services. The next generation of telecommunications networks will be deployed using VoIP technology with soft switching replacing circuit switching and ISDN signalling. New access architectures must be consistent with this approach and able to deliver high speed Internet access.

The course will provide a thorough grounding in copper loop technology. It will then identify the functioning of different evolutions of ADSL from ITU G.992.1 ADSL through G.992.3 ADSL2 to G.992.5 ADSL2+. Consideration will be given to the function of the equipment in the customer premises, the impact of the loop conditions and length together with the DSL service equipment in the exchange deployed using Local Loop Unbundling.

Mechanisms and protocols used to deliver addressing at OSI Layers 2 and three will be studied including the functioning of VLANs at layer 2, Multicasting and both Layer 2 and Layer 3 and the distribution of Layer 3 (IP) addresses. The operation of PPPoA and PPPoE over the loop segment back to the Broadband Access Server and DHCP over Ethernet within the customer premises will be considered.

Finally the position of these Access services will put into the context of the evolution of next generation of telecommunications service. Delivery of Triple Play networks with IP delivered broadcast Television will require high access speeds. This course will provide an intensive study of these technologies.

When you have completed this course you will be able to:

- Describe in detail the electrical fundamentals of local access loops
- Identify the key ADSL, ADSL2 and ADSL2+ technologies and standards
- Deploy services using IEEE 802 standards for addressing aggregation and VLANs
- Describe how PPPoA functions today
- Migrate access to PPPoE and VLAN operation with Gigabit Ethernet
- Appreciate how Multicasting works at Layer 2 and Layer 3
- Discuss the mechanisms used to carry services over IP from CPE using DHCP
- Discuss the evolution of next generation networks able to deliver Triple Play services

Prerequisites:

A basic knowledge of IP and ATM will be assumed.

Prerequisite courses:

Understanding IP and Datanetworking

ATM: In depth Overview

Follow on courses:

Introduction to IPTV Broadcasting Systems

Understanding MultiService Access and H.248

Understanding MultiService Access and SIP

This course includes the following modules:

Architecture of Access Loops

Characteristics of twisted Pairs
Electrical requirements for analogue voice
ISDN loop requirements
Frequency and distance trade-off
Impact of loading coils
Testing loops with TDR techniques
Noise and crosstalk
Impact of noise: Shannon's Limit

ADSL G.922.1

Asymmetric digital subscriber line (ADSL)
Modes of operation
Loop requirements of ADSL
Transport protocol functionalities
Network Timing Reference
Scrambling
Forward Error Correction
Constellation encoding and Trellis decoding
Upstream and downstream spectrum
Training and handshaking
Testing Parameters at near end and far end
Overhead control channel
Specific requirements for an ADSL system operating in the frequency band above POTS
Pilot frequencies and spectral masks
Initialization and electrical characteristics
DC characteristics
Voice-band characteristics
ADSL Band characteristics
Splitters and filters
Dynamic Rate adaptation

ADSL2 G922.3

ADSL2 functional model
Transport Protocol Specific Convergence Functions
Control parameters
Data plane procedures
Management plane procedures
Power management
Modification of constellations from ADSL
Subcarriers
Downstream band modifications

ADSL 2+ G.992.5

Modification from ADSL2
Frequency band differences
Initialization
Overlapping spectrum operation

DSL Forum TR-101 Migration to Ethernet-Based DSL Aggregation

Motivation for Ethernet DSL Migrations
Terminology
Topology Aspects
Ethernet Aggregation
Broadband Network Gateways
Multicast Architecture
QoS Support
Business Service Support
Policy Management
ARP Processing
Requirements for IP address allocation

IEEE 802 Elements

IEEE 802 standards Structure
Ethernet and 802 addressing
Gigabit Ethernet
Evolution of Ethernet
CSMA/CD and its replacement by Switching
Layer 1 presentations
Concept of a LAN and a VLAN
Interconnecting LANs
Bridging: 802.1d
Spanning Tree Delays and Rapid Spanning Tree
VLANs
VLAN Trunking
IEEE 801.1Q
Selection of VLAN Identifiers
IEEE 802.1p QoS
IEEE 802.1ad Provider Bridge

IP Address Allocation

PPPoE/PPPoA Advantages and disadvantages
PPPoA operation recap
RFC1483
SNAP
OUI
Selecting bridging and routing protocols
VC selection by protocol
PPPoE Architecture
RFC2364/2516
Linking to Service Providers
L2TP and other service provision
Maximum receiver unit considerations
PPPoE Protocol Exchanges
PPP Session Stage
LCP Considerations
Security Considerations
DHCP Relay Agents

Precedence and Quality of Service

Mechanisms for QoS
Queuing and queue management
Weighted fair queuing
Layer 2: 802.1P QoS at layer 2
Delivering QoS at Layer 3

Futures

Evolution to Triple Play Services
Provision of VoIP over the Access
Signalling options for voice: SIP, MGCP and MEGACO
IPTV
Multicast TV
Video on Demand
Extending bandwidth with VDSL2

Location	Duration	RRP	May	Jun	Jul	Aug	Sep	Oct
Click on course date to make a booking or check availability.
London	2 days	£995	21 - 22		9 - 10		3 - 4

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