DSL Access Techniques

2 Day Course
Code PWL035

This course has been superseded by the Fixed Copper Access course.


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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.

Relevant Certifications

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