Motorola WS5100 Series Reference Manual page 419

Max RTT Displays the longest round trip time for ping packets transmitted from the switch
to its destination IP address. This may reflect the time when data traffic was at its
most congested for the two devices.
Average RTT Displays the average round trip time for ping packets transmitted between the
switch and its destination IP address. Use this value as a general baseline (along
with packets sent vs packets received) for the overall connection and association
potential between the switch and target device.
Last Response Displays the time (in seconds) the switch last "heard" the destination IP address
over the switch managed network. Use this time (in contention with the RTT
values displayed) to determine whether this device warrants a permanent switch
connection.
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Diagnostics