5.3.2 HSR UNICAST TOPOLOGY
With unicast frames, there is just one destination and the frames are sent to that destination alone. All non-
recipient devices simply pass the frames on. They do not process them in any way. In other words, D frames are
produced only for the receiving DANH. This is illustrated below.
DANH
Source
DANH Redbox
DANH DANH DANH
A frame B frame
C frame
Switch
Singly Attached
Nodes
D frame
Destination
V01031
Figure 287: HSR unicast topology
For unicast frames, the whole bandwidth is available as both frames A & B stop at the destination node.
5.3.3
HSR APPLICATION IN THE SUBSTATION
Chapter 22 - Communications P543i/P545i
540 P54x1i-TM-EN-1
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