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TRENDnet User's Guide
QoS (Quality of Service)
When a port on an Ethernet switch becomes oversubscribed, its egress
queues contain more packets than the port can handle in a timely manner. In this
situation, the port may be forced to delay the transmission of some packets, resulting in
the delay of packets reaching their destinations. A port may be forced to delay
transmission of packets while it handles other traffic, and, in some situations, some
packets destined to be forwarded to an oversubscribed port from other switch ports
may be discarded.
Minor delays are often of no consequence to a network or its performance. But there
are applications, referred to as delay or time sensitive applications, which can be
impacted by packet delays. Voice transmission and video conferences are two examples.
If packets carrying data in either of these cases are delayed from reaching their
destination, the audio or video quality may suffer.
This is where Cost of Service (CoS) is of value. It allows you to manage the flow of traffic
through a switch by having the switch ports give higher priority to some packets, such as
delay sensitive traffic, over other packets. This is referred to as prioritizing traffic.
CoS
Set CoS priority settings
QoS > CoS
Note: Before mapping the CoS priorities and the egress queues, you must disable the
Jumbo frame parameter on each port. When Jumbo frames are enabled, COS cannot be
enabled.
1. Log into your switch management page (see "Access your switch management page"
on page 5).
2. Click on QoS and click on CoS.
3. In QoS Status, select Enabled and then click Apply.
•
For each Priority who's Queue ID you want to change, click on the CoS Table
(1-7, Ignore) radio button that applies to your configuration.
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4. Review the settings. Click Apply to save the settings.
5. At the bottom of the left hand panel, click Save.
6. Select the Config you would like to save the settings to, click Save Settings to Flash,
then click OK.
Note: This step saves all configuration changes to the NV-RAM to ensure that if the
switch is rebooted or power cycled, the configuration changes will still be applied.
PoE Web Smart Switch Series
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