D-Link Air DCF-660W/K Manual page 22

Link Test:
The Link Test tab helps you examine point-to-point data transmission
quality between the DCF-660W and any workstation on the network. By
entering the IP address of remote station, setting Ping Interval and Packet
Size, you can find out if communication has been made successfully. The
Refresh button is used for setting counters back to 0.
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