Concept Guide

timeout and slot-time values may be derived, but those values are never less then the default values for an
indoor AP.
Mesh radios on outdoor APs have additional constraints, as mesh links may need to span long distances. For
mesh radios on outdoor APs, the effect of the default maximum-distance parameter on the ack-timeout,
cts-timeout and slot-time values depends on whether the APs are configured as mesh portals or mesh
points. This is because mesh portals use a default maximum-distance value of 16,050 meters, and mesh
points use, by default, the maximum possible maximum-distance value.
The maximum-distance value should be set correctly to span the largest link distance in the mesh network so
that when a mesh point gets the configuration from the network it will apply the correct ack-timeout, cts-
timeout and slot-time values.The values derived from the maximum-distance setting depend on the band
and whether 20Mhz/40MHz mode of operation is in use.
The following table indicates values for a range of distances:
Timeouts[usec] --- 5GHz radio --- --- 2.4GHz radio ---
Distance[m] Ack CTS Slot Ack CTS Slot
--------------------------------------------------------------------------
0 (outdoor:16050m) 128 128 63 128 128 63
0 (indoor:600a,6450g) 25 25 9 64 48 9
200 (==default) 25 25 9 64 48 9
500 25 25 9 64 48 9
600 25 25 9 64 48 9
1050 28 28 13 64 48 31
5100 55 55 26 64 55 31
10050 88 88 43 88 88 43
15000 121 121 59 121 121 59
16050 128 128 63 128 128 63
58200(5G limit 20M) 409 409 203 - - -
52650(2.4G limit 20M) - - - 372 372 185
27450(5G limit 40M) 204 204 101 - - -
24750(2.4G limit 40M) - - - 186 186 92
Examples
The following command configures APs to operate in AM mode for the selected dot11g-radio-profile named
“sampleg:”
rf dot11g-radio-profile sampleg
mode am-mode
The following command configures APs to operate in high-throughput (802.11n) mode on the
2.4 Ghz frequency band for the selected dot11g-radio profile named “sampleg” and assigns a high-throughout
radio profile named “default-g:”
rf dot11g-radio-profile sampleg
high-throughput-enable
ht-radio-profile default-g
The following command configures a primary channel number of 1 and a secondary channel number of 5 for
40 MHz mode of operation for the selected dot11g-radio profile named “sampleg:”
rf dot11g-radio-profile sampleg
channel <1+>
Dell Networking W-Series ArubaOS 6.5.x | Reference Guide rf dot11g-radio-profile | 756