Avaya Business Secure Router 252 Configuration - Basics Instrukcja Użytkownika Strona 54

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54 Chapter 3 Wizard setup
NN47923-500
PPP over Ethernet
PPP over Ethernet (PPPoE) provides access control and billing functionality in a
manner similar to dial-up services using PPP. The Business Secure Router bridges
a PPP session over Ethernet (PPP over Ethernet, RFC 2516) from your computer
to an ATM (Asynchronous Transfer Mode) PVC (Permanent Virtual Circuit),
which connects to an ADSL Access Concentrator where the PPP session
terminates. One PVC can support any number of PPP sessions from your LAN.
For more information about PPPoE, see the PPPoE appendix in the Nortel
Business Secure Router 252 Configuration — Advanced guide.
PPPoA
A Point to Point Protocol over ATM Adaptation Layer 5 (PPPoA) connection
functions like a dial-up Internet connection. The Business Secure Router
encapsulates the PPP session based on RFC 1483 and sends it through an ATM
PVC (Permanent Virtual Circuit) to the Internet Service Provider (ISP) DSLAM
(Digital Subscriber Line Access Multiplexer). For more information about
PPPoA, refer to RFC 2364. For more information about PPP, refer to RFC 1661.
RFC 1483
RFC 1483 describes two methods for Multiprotocol Encapsulation over ATM
Adaptation Layer 5 (AAL5). Using the first method, you can multiplex multiple
protocols over a single ATM virtual circuit (LLC-based multiplexing). The second
method assumes that each protocol is carried over a separate ATM virtual circuit
(VC-based multiplexing). For more detailed information, see RFC 1483.
Multiplexing
There are two conventions to identify which protocols the virtual circuit (VC)
carries. Be sure to use the multiplexing method required by your ISP.
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