Specifications

Functions
RS2-4R
Release 1.0 03/04
4.3 Frame switching
95
U Strict priority
With Strict priority, the RS2-4R sends all data packets with a higher pri-
ority level before it sends a data packet with the next lower priority level.
Thus
RS2-4R does not send a data packet with the next lower priority
until there are no other data packets waiting in the queue.
4.3.5 Tagging
The VLAN tag is integrated into the MAC data frame for the VLAN and prior-
itization functions in accordance with the IEEE 802.1 Q standard. The VLAN
tag consists of 4 Bytes. It is inserted between the source address field and
the type field.
With data packets with VLAN tag, the RS2-4R evaluates
D the priority information at all times, and
D the VLAN information, if VLANs have been set up.
Data packets whose VLAN tags contain priority information but no VLAN in-
formation (VLAN ID = 0) are known as "Priority Tagged Frames".