Siemens SCALANCE XR-300WG Series Operating Instructions Manual page 58

Technical specifications
7.6 Switching properties
Switching properties
QoS priority queues
Switching technique
Latency
Full wire speed switching
Note
The number of SCALANCE XR-300WG modules connected in a line influences the frame
delay. When a frame passes through IE switches of the SCALANCE XR-300WG product
line, it is delayed by the store and forward function of the device:
• with a 64 byte frame length by approx. 10 microseconds (at 100 Mbps)
• with a 1500 byte frame length by approx. 130 microseconds (at 100 Mbps)
This means the more devices of the SCALANCE XR-300WG product line that the frame
passes through, the longer the frame delay.
58
4
Store and forward
10 microseconds
Frame length (bytes)
64
128
256
512
1024
1280
1518
Number of frames per second (at 100 Mbps)
148810
84459
45290
23496
11973
9615
8127
Operating Instructions, 05/2017, C79000-G8976-C454-01
SCALANCE XR-300WG