PLANET ISW-504PS - Manual (Page 64)

User’s Manual
Figure 4-39 Quality of Service screen
4.6.1 802.1p Tag Priority Mode
QoS settings allow customization of packet priority in order to facilitate delivery of data traffic that might be affected by
latency problems. When 802.1p Tag Priority is applied, the Industrial PoE Switch recognizes 802.1Q VLAN tag packets
and extracts the VLAN tagged packets with User Priority value.
802.1Q Tag and 802.1p priority
User Priority CFI VLAN ID (VID)
3 bits 1 bits 12 bits
TPID (Tag Protocol Identifier) TCI (Tag Control Information)
2 bytes 2 bytes
Preamble
Destination
Address
Source
Address
VLAN TAG
Ethernet
Type
Data FCS
6 bytes 6 bytes 4 bytes 2 bytes 46-1517 bytes 4 bytes
Figure 4-40 802.1p Tag Priority
The IEEE 802.1p Tag Priority specification uses 2 priority levels to classify data packets. The screen in Figure 4-41
appears.
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