ZyXEL ADSL2+ User Manual download pdf (Page 45)

P-660R-T Series User’s Guide

45 Chapter 3 Wizard Setup

3.1.1.4 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 the RFC for more detailed information.

3.1.2 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.

3.1.2.1 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.

3.1.2.2 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.

3.1.3 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.

3.1.4 Internet Access Wizard Setup: First Screen

In the SITE MAP screen click Wizard Setup to display the first wizard screen.

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ZyXEL ADSL2+ User Manual Page 45