This value indicates the WDS Ack timeout for this radio in us,
and the following values can be set to the system:
0 Set wireless Ack Timeout as system default
20 0 to 1 miles: Ack timeout is 20 us
40 1 to 3 miles: Ack timeout is 40 us
75 3 to 6 miles: Ack timeout is 75 us
115 6 to 10 miles: Ack timeout is 115 us