ZyXEL Communications NWA-3160 User Manual

 Chapter 9 SSID Screen

NWA-3160 Series User’s Guide

typical data packet sizes. Note that the figures given are merely examples - sizes 
may differ according to application and circumstances.

When ATC is activated, the device sends traffic with smaller packets before traffic 
with larger packets if the network is congested. 

ATC assigns priority to packets as shown in the following table.

You should activate ATC on the NWA if your wireless network includes networking 
devices that do not support WMM QoS, or if you want to prioritize traffic but do not 
want to configure WMM QoS settings. 

The NWA can use a mapping mechanism to use both ATC and WMM QoS. The 
ATC+WMM function prioritizes all packets transmitted onto the wireless network 
using WMM QoS, and prioritizes all packets transmitted onto the wired network 
using ATC. See 

 for details of how to configure 

ATC+WMM.

Use the ATC+WMM function if you want to do the following: 

• enable WMM QoS on your wireless network and automatically assign a WMM 

priority to packets that do not already have one (see 

). 

• automatically prioritize all packets going from your wireless network to the 

wired network (see 

).

Table 32   Typical Packet Sizes

Voice over IP (SIP)

High

< 250

Online Gaming

High

60 ~ 90

Web browsing (http)

Medium

300 ~ 600

FTP

Low

1500

Table 33   Automatic Traffic Classifier Priorities

1 ~ 250 

ATC_High

250 ~ 1100 

ATC_Medium

1100 + 

ATC_Low