LevelOne FSW-1671 - Manual (Page 34)

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QoS setting
Here you can configure QoS policy priority mode and CoS (Class of Service)
configuration. QoS (Quality of Service) refers to mechanisms in the network software
that make the actual determination of which packets have priority. CoS refers to feature
sets, or groups of services, that are assigned to users based on company policy. If a
feature set includes priority transmission, then CoS winds up being implemented in QoS
functions within the routers and switches in the network. In an enterprise network, class
of service (CoS) differentiates high-priority traffic from lower-priority traffic. Tags may be
added to the packets to identify such classes, but they do not guarantee delivery as do
quality of service (QoS) functions, which are implemented in the network devices.
Priority mode
There are three priority modes available to specify the priority of packets being serviced.
Those include First-In-First-Out, All-High-Before-Low, and Weight-Round-Robin.