Manual for MVK-MPNIO Modules
V 1.9 15
2.4 Ethernet Switching Mechanisms
Store and forward
With this technique, the switch buffers the whole Ethernet frame from the input port and verifies
it. After successful verification, the switch forwards the frame to the destination port according to
its switching table.
C
ut Through
To minimize switching times in Ethernet networks, the cut-through-switch reads only up to the
frame's hardware address before starting to forwarding it.
After receiving of the first bytes containing the MAC-address, the whole data frame is switched
to the output port. Typical delay time for 100 Mbit/s is about 2µs. This technique is recommend-
ed for switch cascades with more than 30 nodes, especially when data frames bigger than the
typical PROFINET 64Byte-frames are used in the network. All MVK+ MPNIO POF include a 2-
port Ethernet cut-through switch.
MV
K´s with a 2-Port Ethernet Cut-Through Switch:
f
rom SW Version 3.51 and 4.00
55256, 55257, 55283, 55528 and 55529
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