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BIPAC 5100S encapsulates the PPP session based on RFC1483 and sends it through an ATM
PVC (Permanent Virtual Circuit) to the Internet Service Provider's (ISP) DSLAM (digital access
multiplexer). Please refer to RFC 2364 for more information on PPPoA. Refer to RFC 1661 for
more information on PPP.
3.2.4 RFC 1483
RFC 1483 describes two methods for Multiprotocol Encapsulation over ATM Adaptation Layer
5 (AAL5). The first method allows multiplexing of multiple protocols over a single ATM virtual
circuit (LLC-based multiplexing) and the second method assumes that each protocol is carried
over a separate ATM virtual circuit (VC-based multiplexing). Please refer to the RFC for more
detailed information.
3.3 Multiplexing
There are two conventions to identify what protocols the virtual circuit (VC) is carrying. Be sure
to use the multiplexing method required by your ISP.
3.3.1 VC-based Multiplexing
In this case, by prior mutual agreement, each protocol is assigned to a specific virtual circuit;
for example, VC1 carries IP, etc. VC-based multiplexing may be dominant in environments
where dynamic creation of large numbers of ATM VCs is fast and economical.
3.3.2 LLC-based Multiplexing
In this case one VC carries multiple protocols with protocol identifying information being
contained in each packet header. Despite the extra bandwidth and processing overhead, this
method may be advantageous if it is not practical to have a separate VC for each carried
protocol, for example, if charging heavily depends on the number of simultaneous VCs.
3.4 VPI and VCI
Be sure to use the correct Virtual Path Identifier (VPI) and Virtual Channel Identifier (VCI)
numbers assigned to you. The valid range for the VPI is 0 to 255 and for the VCI is 32 to 65535
(0 to 31 is reserved for local management of ATM traffic). Please see the appendix for more
information.
3.5 Wizard Setup Configuration: First Screen
In the SITE MAP screen click Wizard Setup to display the first wizard screen.