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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.
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.
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Set CoS priority settings
Bridge > QoS > CoS
CoS Settings
For each Traffic Class whose queue you want to change, click on the CoS
Table (Low, Medium, High, or Highest) radio button that applies to your
configuration.
After you have completed this mapping process, select Enabled in the
QoS Status field.
Go Save Settings to Flash section to save the change on the flash to make
sure the change is permanent.
TPE-4840WS
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