ZyXEL Communications Corporation AMG1302 Benutzerhandbuch

Chapter 6 WAN Setup

AMG1302-T10A 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.