User's Manual

481 | Wireless Intrusion Prevention Dell Networking W-Series ArubaOS 6.4.x| User Guide
Understanding TotalWatch Scanning Spectrum Features
TotalWatch scans the following frequencies.
l G-band—2412MHz to 2472MHz
l J band—2484 MHz
l A-band—5000-5100Mhz to 5895MHz
l J-band—4900-4995MHz
Table 91 list the frequency-to-channel mapping used by TotalWatch.
Frequency Channel
2412 – 2472MHz (in increments of 5MHz) 1 - 13
2484MHz 14
5100 – 5895MHz (in increments of 5MHz) 20 - 179
4900 – 4995MHz (in increments of 5MHz) 180 - 199
5000 – 5100MHz 200 - 219
Table 91: Frequency to Channel Mapping
Understanding TotalWatch Channel Dwell Time
When an AP (in am-mode) visits a channel, the amount of time the AP stays on that channel is known as the
dwell time. The channel dwell time is a variable value based on the following channel types.
dwell-time-active-channel—For channels where there is wireless activity. Default setting is 500 ms.
dwell-time-reg-domain channel—For channels that belong to the AP’s regulatory domain group (reg-
domain) with no wireless activity. The default setting is 250 ms.
dwell-time-other-reg-domain-channel—For channels that belong to the all regulatory domain group (all-
reg-domain) with no wireless activity The default setting is 250 ms.
dwell-time-rare-channel—For channels in the rare group where no wireless activity is detected. The default
value is 100 ms.
Use the rf am-scan-profile command to set the dwell time and scan mode.
Understanding TotalWatch Channel Visiting
The Active and DOS channels are visited more frequently than the other channels. The order of preference in
selecting the next channel is:
1. DOS
2. Active
3. reg-domain
4. All-reg-domain
5. Rare
Once a channel is selected, the dwell time for that channel is determined based on the channel type. At the end
of the dwell time, a new channel is picked.