ZyXEL Communications P-324 User's Guide download pdf (Page 88)

P-2602HWNLI User’s Guide

88 Chapter 6 WAN Setup

6.1.1.4 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.

6.1.2 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.

6.1.2.1 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.

6.1.2.2 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.

6.1.3 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.

6.1.4 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. However the encapsulation method assigned influences your choices

for IP address and ENET ENCAP gateway.

6.1.4.1 IP Assignment with PPPoA or PPPoE Encapsulation

If you have a dynamic IP, then the IP Address and ENET ENCAP Gateway fields are not

applicable (N/A). If you have a static IP, then you only need to fill in the IP Address field and

not the ENET ENCAP Gateway field.

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ZyXEL Communications P-324 User's Guide Page 88