Atc+Wmm; Atc+Wmm From Lan To Wlan; Table 16 Typical Packet Sizes; Table 17 Automatic Traffic Classifier Priorities - ZyXEL Communications NWA-3160 Series User Manual

Chapter 6 Wireless Configuration
ATC assigns priority based on packet size, since time-sensitive applications such as Internet
telephony (Voice over IP or VoIP) tend to have smaller packet sizes than non-time sensitive
applications such as FTP (File Transfer Protocol). The following table shows some common
applications, their time sensitivity, and their typical data packet sizes. Note that the figures
given are merely examples - sizes may differ according to application and circumstances.

Table 16 Typical Packet Sizes

APPLICATION
Voice over IP (SIP)
Online Gaming
Web browsing (http)
FTP
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.

Table 17 Automatic Traffic Classifier Priorities

PACKET SIZE (BYTES)
1 ~ 250
250 ~ 1100
1100 +
You should activate ATC on the ZyXEL Device 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.

6.3.3 ATC+WMM

The ZyXEL Device 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
Section 8.2.2 on page 119
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 Section 6.3.3.2 on page

6.3.3.1 ATC+WMM from LAN to WLAN

ATC+WMM from LAN (the wired Local Area Network) to WLAN (the Wireless Local Area
Network) allows WMM prioritization of packets that do not already have WMM QoS
priorities assigned. The ZyXEL Device automatically classifies data packets using ATC and
then assigns WMM priorities based on that ATC classification.
86
TIME TYPICAL PACKET SIZE
SENSITIVITY (BYTES)
High < 250
High 60 ~ 90
Medium 300 ~ 600
Low 1500
ATC PRIORITY
ATC_High
ATC_Medium
ATC_Low
for details of how to configure ATC+WMM.
Section 6.3.3.1 on page
87).
86).
ZyXEL NWA-3160 Series User's Guide