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Deferred Transmissions - A problem ?

I have been monitoring the Ethernet statistics on some of our PLC's that send/retrieve data across our LAN. One of the statistics is called Deferred Transmissions. I'm suspecting that our LAN is being overloaded, but need some expertise in these stats. Here are some examples on 3 plc's in a 4 hour period.

PLC1 Deferred Transmissions - 2819
     Packets In - 1285509
     Packets Out - 1174129
     Single Collisions - 85
     Multiple Collisions - 82

PLC2 Deferred Transmissions - 4058
     Packets In - 1321743
     Packets Out - 1189409
     Single Collisions - 124
     Multiple Collisions - 147

PLC3 Deferred Transmissions - 2426
     Packets In - 1139660
     Packets Out - 1011333
     Single Collisions - 72
     Multiple Collisions - 51

Any comments ?
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1 Solution
Deferred transmissions are an integral part of Ethernet and TCP/IP communications. The very low ratio of deferred packets to total packets -< 0.01% is nothing to worry about. If the ratio gets up in the range of 10%, then you may have some underlying physical issues that need to be "cleaned up".

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