Point-to-Point Protocol over ATM


Point-to-Point Protocol over ATM

PPPOA or PPPoA, Point-to-Point Protocol (PPP) over ATM, is a network protocol for encapsulating PPP frames in ATM AAL5. It is used mainly with cable modem, DSL and ADSL services.

It offers standard PPP features such as authentication, encryption, and compression. If it is used as the connection encapsulation method on an ATM based network it can reduce overhead slightly (around 0.58%) in comparison to PPPoE. It also avoids the issues that PPPoE suffers from, related to having a MTU lower than that of standard Ethernet transmission protocols. It also supports (as does PPPoE) the encapsulation types: VC-MUX and LLC based.

Point-to-Point Protocol over Asynchronous Transfer Mode (PPPoA) is specified in RFC 2364.Though PPPoE is used in most of the countries, ADSL in the UK, New Zealand, Belgium, France, Denmark, Italy, Austria (for some providers), Poland and the Netherlands uses PPPoA. In those areas the ADSL modem/router supplied needs to support PPPoA.

ee also

*PPPoE
*L2TP
*ATM
*xDSL

External links

* [http://www.dslreports.com/information/kb/DSL-1/pictures A typical PPPoA architecture diagram] (out of date and no longer maintained)

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