ZyXEL Communications Corporation VMG1312T10C Benutzerhandbuch

Chapter 9 Quality of Service (QoS)

VMG1312-T10C User’s Guide

CoS technologies includes DiffServ (Differentiated Services or DS). DiffServ is a new protocol and 
defines a new DS field, which replaces the eight-bit ToS (Type of Service) field in the IP header. 

In a QoS class, you can configure whether to add or change the DSCP (DiffServ Code Point) value 
ain a matched packet. When the packet passes through a compatible network, the networking 
device, such as a backbone switch, can provide specific treatment or service based on the tag or 
marker.

Use this screen to enable or disable QoS, set the bandwidth, and select to have the Device 
automatically assign priority to upstream traffic according to the IP precedence or packet length.

Click Network Setting > QoS to open the General screen.  

Network Setting > QoS > General

The following table describes the labels in this screen. 

Network Setting > QoS > General

Active QoS

Select the check box to turn on QoS to improve your network performance. 

You can give priority to traffic that the Device forwards out through the WAN interface. 
Give high priority to voice and video to make them run more smoothly. Similarly, give 
low priority to many large file downloads so that they do not reduce the quality of other 
applications. 

Traffic priority will 
be automatically 
assigned by

Select how the Device assigns priorities to various upstream traffic flows.

•

None: Disables auto priority mapping and has the 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.

Apply

Click Apply to save your changes.

Cancel

Click Cancel to restore your previously saved settings.