THOMSON SpeedTouch, Configuration Manual

Page: 33 / 110

Chapter 4
Bridged PPPoE
E-DOC-CTC-20051017-0167 v1.0
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4 Bridged PPPoE
Introduction
The SpeedTouch™ Bridged Ethernet Packet Service can be used in combination
with a PPP over Ethernet (PPPoE) client installed on your computer. The resulting
Bridged PPPoE packet service provides similar Dial–In experience as found on
point–to–point connections.
Features
Bridged PPPoE has the following features:
A Dial-In access method over a virtual Ethernet segment
Platform and Operating System independent towards the SpeedTouch™
The features of the SpeedTouch™ Bridged Ethernet Packet Service.
Bridged PPPoE vs.
connection service
The Bridged PPPoE Packet Service relies on the AAL5/RFC2684/Bridged Connection
Service to achieve end-to-end connectivity.
This connection service type implies the encapsulation of Ethernet frames (often
referred to as IEEE802.3, MAC frames or Bridging frames) in AAL5/ATM.
All SpeedTouch™ products are compliant with RFC2684 “Multi-protocol
Encapsulation over ATM Adaptation Layer 5” and support both the LLC/SNAP and
VC-MUX encapsulation method for Bridged Ethernet V2.0/IEEE802.3 Protocol Data
Units (PDUs). The default encapsulation method is set to LLC/SNAP.
Protocol stack
The figure below shows the bridged PPPoE protocol stack.
DSLAM
SpeedTouch
operating as
Transparent Bridge PPPoE client on PC
terminates the PPP
connection
Virtual Channel with:
ATM Encapsulation Type: LLC/SNAP
Connection Service Name: PPPoE
Connection Service Type: PPPoE
BRAS
Internet
Public IP address
ip
mac
eth
adsl
CPE DSLAM PC
Service
Gateway
RFC1483b
AAL5/ATM
PHY
IP
mac
ppp
PPP
PPPoE
PPPoE