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Point-to-Point Protocol over ATM
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(Point-to-Point Protocol Over ATM) Using the PPP dial-up protocol with ATM as the transport. Used by some DSL providers, IP packets travel from the PC over Ethernet to the DSL modem, officially known as an "ADSL transceiver unit-remote" (ATU-R). The ATU-R adds the PPP protocol to the IP packets and transports them to the carrier's DSLAM via ATM.
PPPoEoA (PPP Over Ethernet Over ATM)
PPPoEoA is an alternative to PPPoA. PPPoEoA takes advantage of the authentication and security features of PPP by providing end-to-end PPP connectivity. It establishes the PPP session in the PC rather than at the DSL modem. See PPP, PPPoE, DSL and ATM.
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Point-to-Point Protocol over ATM
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Point-to-Point Protocol over ATM
The Point-to-Point Protocol over ATM (PPPoA) is a network protocol for encapsulating PPP frames in AAL5. It is used mainly with DOCSIS and DSL carriers.
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.
The use of PPPoA over PPPoE is not geographically significant; rather, it varies by the provider's preference.
Configuration
Configuration of a PPPoA requires PPP configuration and ATM configuration. These data are generally stored in a cable modem or DSL modem, and may or may not be visible to - or configurable by - a user.
PPP configuration generally includes: user credentials, user name and password, and is unique to each user.
ATM configuration includes:
- Virtual Channel Link (VCL) – Virtual Path Identifier & Virtual Circuit Identifier (VPI/VCI), such as 0/32 (analogous to a phone number)
- Modulation (Type): such as G.DMT
- Multiplexing (Method): such as VC-MUX or LLC
ATM configuration can either be performed manually, i.e., it may not be automatically negotiated, or it may be hard-coded (or pre-set) into the firmware of a DSL modem provided by the user's ISP.
See also
External links
- A typical PPPoA architecture diagram (out of date and no longer maintained)
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