ZyXEL Communications ADSL2+4 用户手册

Chapter 6 WAN Setup

P-660H-T1v3s User’s Guide

This section provides some technical background information about the topics 
covered in this chapter.

Be sure to use the encapsulation method required by your ISP. The P-660H-T1v3s 
supports the following methods.

The MAC Encapsulated Routing Link Protocol (ENET ENCAP) is only implemented 
with the IP network protocol. IP packets are routed between the Ethernet interface 
and the WAN interface and then formatted so that they can be understood in a 
bridged environment. For instance, it encapsulates routed Ethernet frames into 
bridged ATM cells.

The P-660H-T1v3s supports PPPoE (Point-to-Point Protocol over Ethernet). PPPoE 
is an IETF Draft standard (RFC 2516) specifying how a personal computer (PC) 
interacts with a broadband modem (DSL, cable, wireless, etc.) connection. The 
PPPoE option is for a dial-up connection using PPPoE.

Maximum Burst Size

Maximum Burst Size (MBS) refers to the maximum number of 
cells that can be sent at the peak rate. Type the MBS, which is 
less than 65535. 

MTU
MTU

The Maximum Transmission Unit (MTU) defines the size of the 
largest packet allowed on an interface or connection. Enter the 
MTU in this field.

For ENET ENCAP, the MTU value is 1500.

For PPPoE, the MTU value is 1492.

For PPPoA and RFC, the MTU is 65535.

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Table 16   Network > WAN > More Connections: Edit: Advanced Setup (continued)