ICP DAS USA MSM-508FCS - Manual (Page 23)

Industrial Ethernet Layer 2 Managed Switch – Web Management Manual
April 29, 2008 20
8. QoS
Quality of Service (QoS) provides different priority to different data flow. It can make you to
classify and prioritize data frames.
ICPDAS Managed Switch support 4 classes of services priority queues. This function allows you
to determine the QoS tag priority and specify the priority processing scheme.
QoS Mode
There are two options supported to classify egress frames.
8,4,2,1 Weight Fair queuing scheme
8,4,2,1 weighting is mapped to 4 priority queues.
In this queuing scheme mode, lower priority frames are transferred only have a slight delay
to the higher priority frames.
Strict priority scheme
The frames in the highest priority queue are processed until the queue is empty.
If the highest priority queue occupied all the time, the frames in the lower priority queue may
never be served.
802.1p Tag Priority
Enable/Disable specified ports using the 802.1p tag if the frame is tagged.