Specifications

Known Problems 31
0.0.1 Quality of Service
Identifier
Infrastructure Dependant Features
Known Problems
b/g/n
802.11 operates in the 2.4GHz Industrial Scientific Medical (ISM) band. This band is unlicensed
and many different wireless equipment uses this band with various radio techniques.
As described in Section , “Clear Channel Assessment, CCA”, on page -23, the CCA makes 802.11
equipment sensitive to other transmissions. This applies to all RF signals, not only other 802.11
equipment.
If CCA problems occur, it will affect the transmission part of the link between the AP and the hand-
set. If the uplink speech (from the handset) drops, the problem is near the handset. Check for near-
by equipment such as wireless surveillance cameras, Bluetooth gadgets, WiDi devices, ZigBee/
Z-wave for HVAC controls, Light controls, automation etc.
a/n
DFS channels.
Data traffic in a b/g/n network with large aggregated packets might delay voice traffic.
802.11n
A full-blown 802.11n AP will also saturate the wired link to the Ethenet switch since it can easily
pump out more than 100 Mbps of data. Thus to benefit from the 802.11n standard the link to the
switch must be upgraded to support Gigabit, otherwise the AP will have to queue data frames and
eventually throw away packets.
Item Recommend-
ed Settings
Description
WMM Enable
*
* For the specific infrastructure, see the Interoperability Report.
Disabled QoS may work but there will be no guarantee for
high voice quality.
Item Recommend-
ed Settings
Description
SSID Max. 32 char A unique identifier which stations use to associate with the
AP.
Broadcast SSID Enable A broadcasted SSID will assist the WLAN clients to roam
passively
Item Recommend-
ed Settings
Description
Automatic RF
adaptation
Disabled Dynamic changes make the RF environment inconsistent.
Load balancing Disabled A forced transition of a client will cause loss of speech
frames.