Chapter 12 Quality of Service (QoS)
AX/DX/EX/PX Series User’s Guide
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Figure 154   Network > QoS > General
The following table describes the labels in this screen.
Table 87   Network Setting > QoS > General
LABEL DESCRIPTION
QoS Click this switch to enable QoS to improve your network performance.
WAN Managed 
Upstream 
Bandwidth
Enter the amount of upstream bandwidth for the WAN interfaces that you want to allocate using 
QoS.
The recommendation is to set this speed to match the interfaces’ actual transmission speed. For 
example, set the WAN interfaces’ speed to 100000 kbps if your Internet connection has an 
upstream transmission speed of 100 Mbps.
You can also set this number lower than the interfaces’ actual transmission speed. This will cause 
the Zyxel Device to not use some of the interfaces’ available bandwidth.
If you leave this field blank, the Zyxel Device automatically sets this number to be 95% of the 
WAN interfaces’ actual upstream transmission speed.
Upstream Traffic 
Priority Assigned 
by
Select how the Zyxel Device assigns priorities to various upstream traffic flows.
• None: Disables auto priority mapping and has the Zyxel Device put packets into the queues 
according to your classification rules. Traffic which does not match any of the classification 
rules is mapped into the default queue with the lowest priority.
• Ethernet Priority: Automatically assign priority based on the IEEE 802.1p priority level.
• IP Precedence: Automatically assign priority based on the first three bits of the TOS field in the 
IP header.
• Packet Length: Automatically assign priority based on the packet size. Smaller packets get 
higher priority since control, signaling, VoIP, Internet gaming, or other real-time packets are 
usually small while larger packets are usually best effort data packets like file transfers.
Cancel Click Cancel to restore your previously saved settings.
Apply Click Apply to save your changes.