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 Chapter 6 WAN Setup
AMG1302-T10A User’s Guide
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Operationally, PPPoE saves significant effort for both you and the ISP or carrier, as it requires no 
specific configuration of the broadband modem at the customer site.
By implementing PPPoE directly on the Device (rather than individual computers), the computers on 
the LAN do not need PPPoE software installed, since the Device does that part of the task. 
Furthermore, with NAT, all of the LANs’ computers will have access.
6.4.1.3  PPPoA
PPPoA stands for Point to Point Protocol over ATM Adaptation Layer 5 (AAL5). A PPPoA connection 
functions like a dial-up Internet connection. The Device 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 Subscriber Line (DSL) Access Multiplexer). Please refer to RFC 2364 
for more information on PPPoA. Refer to RFC 1661 for more information on PPP.
6.4.1.4  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 RFC 1483 for more detailed 
information.
6.4.2  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.
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.
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.
6.4.3  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.
6.4.4  IP Address Assignment
A static IP is a fixed IP that your ISP gives you. A dynamic IP is not fixed; the ISP assigns you a 
different one each time. The Single User Account feature can be enabled or disabled if you have