Point-to-Point Protocol Over ATM (PPPoA)
This section describes the encapsulations, data flow, IP addressing considerations, and design considerations required for implementing an end-to-end ADSL architecture using PPPoA. PPPoA has created high interest and is gaining service provider popularity. It will form a larger portion of future ADSL deployments.
PPP is defined in RFCs 1331 and 1661 as a standard method of encapsulating different types of higher-layer protocol datagrams across point-to-point connections. It extends the high-level data link control (HDLC) packet structure with a 16-bit protocol identifier that contains information about the packet's contents.
PPP is defined for use specifically with AAL5 in RFC 2364. PPPoA ...