ZyXEL Communications P-6600HW-Tx v3 User Manual

Chapter 7 WAN Setup

P-660HW-Tx v3 User’s Guide

The VBR-nRT (non real-time Variable Bit Rate) type is used with bursty connections that do 
not require closely controlled delay and delay variation. It is commonly used for "bursty" 
traffic typical on LANs. PCR and MBS define the burst levels, SCR defines the minimum 
level. An example of an VBR-nRT connection would be non-time sensitive data file transfers.

The Unspecified Bit Rate (UBR) ATM traffic class is for bursty data transfers. However, UBR 
doesn't guarantee any bandwidth and only delivers traffic when the network has spare 
bandwidth. An example application is background file transfer.

Once you turn on and connect the ZyXEL Device to a telephone jack, it automatically detects 
the Internet connection settings (such as the VCI/VPI numbers and the encapsulation method) 
from the ISP and makes the necessary configuration changes. In cases where additional 
account information (such as an Internet account user name and password) is required or the 
ZyXEL Device cannot connect to the ISP, you will be redirected to web screen(s) for 
information input or troubleshooting.
Zero configuration for Internet access is disable when 

• the ZyXEL Device is in bridge mode
• you set the ZyXEL Device to use a static (fixed) WAN IP address. 

To change your ZyXEL Device’s WAN Internet access settings, click Network > WAN. The 
screen differs by the encapsulation. 
See 

 for more information.