Xtramus NuWIN V1.1 - Manual (Page 168)

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4.22 X-Trailer
X-Trailer is the checksum computed on the contents of the frame from the offset
through the end of the data field, inclusive. If data is corrupted by DUT and FCS is
affected by the errored data, X-Trailer will serve as the checksum. Any mismatches of
X-Trailer of transmitted and received packets are recorded as X-Trailer errors.
Move the cursor to the port transmitting packets with X-Trailer attached. In this case,
it’s (0,4,1). Choose Enable X-Trailer Padding for the current port.
From the Chassis Panel, port (0,4,1) with Continuous(C) and Fixed(F) Length mode
is ready to send packets with X-Trailer attached.