DSL Access Techniques

2 Day Course
Code PWL035

Book Now - 3 Delivery Methods Available:

Scheduled Online Onsite


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


Hide all

Architecture of Access Loops (8 topics)

  • 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 (20 topics)

  • 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 (9 topics)

  • 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 (4 topics)

  • Modification from ADSL2
  • Frequency band differences
  • Initialization
  • Overlapping spectrum operation

DSL Forum TR-101 Migration to Ethernet-Based DSL Aggregation (11 topics)

  • 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 (16 topics)

  • 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 (17 topics)

  • 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 (5 topics)

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

Futures (7 topics)

  • 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


A basic knowledge of IP and ATM will be assumed.

Additional Learning

The courses below may help you meet the knowledge level required to take this course. If you are unsure please ask a training advisor .

Relevant Certifications

Scheduled Dates

Please select from the dates below to make an enquiry or booking.


Different pricing structures are available including special offers. These include early bird, late availability, multi-place, corporate volume and self-funding rates. Please arrange a discussion with a training advisor to discover your most cost effective option.

Code Location Duration Price Mar Apr May Jun Jul Aug

(Classroom or Online)
2 Days $1,695

What Our Customers Say

The training was delivered with a high level of expertise and excellence. Instructor was highly knowledgeable.”

Technical Trainer, Aviat Networks

Overall the course was really good, the trainer really understood the material and was very approachable.”

Customer Training Manager, Aviat Networks

Excellent course, informative and well-paced.”

CSE, Cisco

Course was very well outlined. Topics were great and bridged many gaps.”

System Engineer, Cable & Wireless

An excellent intro to video encoding & MPEG transport streams - I would definitely recommend it.”

Broadcast Engineer, Cisco

Definitely an excellent intro. Left me interested in learning more.”

Broadcast Engineer, Eircom

Excellent training course with real examples and practical classroom demonstrations.”

Transport Designer, Orange

Instructor knowledge and experience was excellent.”

Solutions Engineer, Akamai

Excellent course, very clear and well organised. Course content delivery was very good.”

Assistant Engineer, Dhiraagu

Very informative and appropriate.”

Network Support Technician, BT

or call:408-759-5074

Course PDF


Share this Course


Recommend this Course