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TRENDnet User’s Guide
TEG-S50ES
41
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 7).
2. Click on QoS and click on CoS.
3. To enable the function, select Enabled in QoS Status, and then click Apply.
NOTE: The configured settings are only applied to the switch’s temporary memory and
will be lost upon the next power-cycle. Please follow these next steps to save the
configurations to the switch’s NV-RAM to ensure the settings will remain throughout
power-cycles and reboots:
1.
From the menu on the left: click on Save, then click the blue button Save
Settings to Flash.
2.
Click Continue to return to the Web Configuration of your switch.
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