WESM zl Management and Configuration Guide WT.01.28 and greater

3-23
Radio Port Configuration
Configuring Radio Settings
3. In the Advanced Properties section, enter a value in the Beacon Interval field.
This value determines the time that the radio allows between sending beacons.
You specify the beacon interval in units of 1,000 ms. The default setting is
100,000 ms.
4. Click the OK button.
Setting the DTIM Period. The DTIM is a known string of bits that can be sent in
a beacon frame. The DTIM notifies wireless stations using power save that the RP
has buffered broadcast or multicast frames that it will be sending soon. DTIMs are
simple data frames that do not require an acknowledgement, so stations sometimes
miss them. To overcome this, RPs are configured to send periodic DTIMs out on
beacons until the data is sent.
To allow wireless stations to sleep longer between transmissions, you can increase
the number of beacons between DTIMs. This helps to preserve battery life for the
wireless station. However, spacing DTIMs further apart increases the chance that a
station may miss the DTIM, which can cause increased jitter and delay. To support
streaming multicast audio and video or other jitter-sensitive applications, you can
decrease the number of beacons between DTIMs.
The default DTIM period on all BSSIDs is 2 beacons.
To set the default number of beacons between DTIMs that radios in your network
broadcast, complete these steps:
1. Select Network Setup > Radio Adoption Defaults and click the
Configuration tab.
2. Select the radio type and click the Edit button.
3. In the DTIM field, enter the number of beacons between DTIMs.
4. Click the OK button.
Setting the Self Healing Offset. In a wireless network that implements neighbor
recovery, an RP radio may increase its power to compensate for a failed RP. In this
case, by default, power is increased to the country’s regulatory maximum. However,
when RPs are situated close to each other or when they use external antennas,
transmitting at this power may cause interference or even illegal operation.
To prevent such interference, set a self healing offset, which is subtracted from the
radio’s maximum power to produce a new maximum for the RP radio responding to
a failed neighbor. (For more information on neighbor recovery, see “Neighbor
Recovery” on page 12-89 of Chapter 12: “Wireless Network Management.”)