Quality of Service (QoS)
Quality of Service General Settings
Use this screen to enable or disable QoS and set the upstream bandwidth or assign traffic priority.
When one of the following situations happens, the current WAN linkup rate will be used instead:
1 WAN Managed Upstream Bandwidth is set to 0
2 WAN Managed Upstream Bandwidth is empty
3 WAN Managed Upstream Bandwidth is higher than the current WAN interface linkup rate
*Manually defined QoS is ignored when Upstream Traffic Priority is selected.
*Upstream Traffic Priority automatically assigns a traffic priority level based on the selected criteria.
*To have your QoS settings configured in other QoS screens take effect, select None in the Upstream Traffic Priority Assigned by field.
Click Network Setting > QoS > General to open the screen as shown next.
Network > QoS > General
The following table describes the labels in this screen.
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.