Observa Telecom TD851W User Manual page 57

IP QoS: Choose "enable", and then you will see the following parameters.
QoS Policy: Policy of QoS. The traffic will be classified on the base of this policy. It can be
based on stream, 802.1p or DSCP. For detail instruction, please refer to
4.3.3.2 802.1p and
Schedule Mode: The schedule mode of the IP QoS function, it can be "strict prior" or "WFQ
(4:3:2:1)".
Strict prior: Traffic with different priority will be send by its priority, the higher priority the
traffic is, the higher priority the traffic will be send out.
WFQ (4:3:2:1): Traffic with different priority will be send in proportion of its priority, the
four priority traffic will be send out in proportion to 4:3:2:1.
Apply: Click this button to save your changes.
Note:
After configuration, you need to click the Save button appeared on the left panel so that your
configuration can still take effect after the Router reboots.
4.3.3.1 Stream
If the QoS policy is "stream based", you should configure the QoS rule. To add a QoS rule, you
need to click the add rule button, and then some corresponding parameters will appear as shown
in Figure 4-32.
TD851W 150Mbps Wireless N ADSL2+ Modem Router User Guide
Figure 4-31
4.3.3.3 DSCP.
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4.3.3.1 Stream,