D-Link DWS-3000 Series User Manual page 84

D-Link Unified Access System
Field
Mode
Maximum Clients
DTIM Period
Beacon Period
Automatic
Channel
Limit Channels
Page 84
Table 11: Radio Settings
Description
The Mode defines the Physical Layer (PHY) standard the radio uses.
The DWL-3500AP and Radio 1 on the DWL-8500AP use the IEEE 802.11g mode PHY
standard. This mode is a higher speed extension (up to 54 Mbps) to the 802.11b PHY, while
operating in the 2.4 GHz band. It uses orthogonal frequency division multiplexing (OFDM). It
supports data rates ranging from 1 to 54 Mbps. IEEE 802.11b clients can use the 802.11g
mode.
Radio 2 on the DWL-8500AP use the IEEE 802.11a mode, which is a PHY standard that
specifies operating in the 5 GHz U-NII band using orthogonal frequency division multiplexing
(OFDM). It supports data rates ranging from 6 to 54 Mbps.
The DWL-8600AP supports:
• Radio 1: IEEE 802.11b/g, IEEE 802.11b/g/n, 2.4 GHz IEEE 802.11n
• Radio 2: IEEE 802.11a, IEEE 802.11a/n, and 5 GHz IEEE 802.11n
If the radio state is disabled, the mode displays as Off.
Specify the maximum number of stations allowed to access this access point at any one time.
You can enter a value between 0 and 256.
The Delivery Traffic Information Map (DTIM) message is an element included in some
frames. It indicates which client stations, currently sleeping in low-power mode, have data
buffered on the access point awaiting pick-up.
The DTIM period you specify indicates how often the clients served by this access point
should check for buffered data still on the AP awaiting pickup.
Specify a DTIM period within the given range (1 - 255).
The measurement is in beacons. For example, if you set this field to "1" clients will check for
buffered data on the AP at every beacon. If you set this field to 10, clients will check on every
10th beacon.
Beacon frames are transmitted by an access point at regular intervals to announce the
existence of the wireless network. The default behavior is to send a beacon frame once every
100 milliseconds (or 10 per second).
The Beacon Interval value is set in milliseconds. Enter a value from 20 to 2000.
The channel defines the portion of the radio spectrum that the radio uses for transmitting and
receiving. The range of channels and the default channel are determined by the Mode of the
radio interface.
When the AP boots, the AP scans the RF area for occupied channels and selects a channel
from the available non-interfering, or clear channels. However, channel conditions can
change during operation.
Enabling the Automatic Channel makes APs assigned to this profile eligible for auto-channel
selection. You can automatically or manually run the auto-channel selection algorithm to allow
the Unified Switch to adjust the channel on APs as WLAN conditions change.
By default, the global auto-channel mode is set to manual. To enable the automatic channel
selection mode, go to the AP Management > RF Management page and select Fixed or
Interval for the Channel Plan mode. You can also run the automatic channel selection
algorithm manually from the Manual Channel Plan page.
Note: If you assign a static channel to an AP in the Valid AP database or on the Advanced
AP Management page, the AP will not participate in the auto-channel selection.
If the radio is operating in 802.11a mode, you can select the Limit Channels check box to
allow the AP to select from the available channels.
Note: The available channels depend on the country in which the APs operate.
If the Limit Channels option is not selected, the AP can also broadcast on channels 149, 153,
157, 161, and 165. Some legacy 802.11a adapters might not support these higher channel
numbers.
Software User Manual
02/15/2011
beacon
Document 34CS3000-SWUM104-D10