When an ATM network is configured with a point-to-point connection, PPPoE can use ATM Adaptation Layer 5 (AAL5) for framing PPPoE-encapsulated packets. The AAL5 protocol provides a virtual connection between the client and the server within the same network. The device encapsulates each PPPoE frame in an ATM frame and transports each frame over an ADSL or SHDSL loop and a digital subscriber line access multiplexer (DSLAM). For example, Figure 25 shows a typical PPPoE over ATM session between a device and an access concentrator on an ADSL loop.
Figure 25: PPPoE Session on an ADSL Loop
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