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Startup and functions
6874_en_16
PHOENIX CONTACT
3-33
Setting the port priority
Figure 3-21
Setting the port priority
–
On the "Port Configuration" web page, both available priority levels can be selected
under "Priority Level".
3.4.4.3
Strict priority
The switch supports two priority queues for adjusting the packet processing sequence
(traffic classes according to IEEE 802.1D). Data telegrams that are received are assigned
to these classes according to their priority, which is specified in the VLAN/prioritization tag:
–
Data packets with values between "0" and "3" in the priority field are low priority
(default).
–
Data packets with values between "4" and "7" in the priority field are transmitted via the
switch with high priority.
The MMS/MCS uses "Strict Priority" for transmitting data telegrams. First,
all
high-priority
data packets are assigned, once these are forwarded, low-priority telegrams are assigned.
This function prevents delays in high-priority data transmission, due to large volumes of low-
priority data traffic. Low-priority traffic is rejected when the memory or data channel is
overloaded.
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