AP Channel and Domain Relationships
APs transmit and receive RF signals over channels within the 2.4 GHz or 5 GHz frequency band. To provide
a stable wireless environment and reduce channel interference, you must specify nonoverlapping channels
for each AP. The recommended channels for 802.11b and 802.11g in North America are 1, 6, and 11.
In a noncontroller-based wireless network, Cisco recommends that you statically configure channels for
each AP. Some channels may need to be statically configured if there is an intermittent interferer to avoid
disruptions in that area. If your wireless network uses a controller, use the Auto-RF feature with minimal
voice disruption.
Note
For more information about AP channel and domain relationships, see the “Designing the Wireless LAN for
Voice” section in the Cisco Desktop Collaboration Experience DX650 Wireless LAN Deployment Guide.
Related Topics
VoIP WLAN Deployment, on page 93
WLANs and Roaming
The Cisco Desktop Collaboration Experience DX650 supports Cisco Centralized Key Management (CCKM),
a centralized key management protocol, and provides a cache of session credentials on the wireless domain
server (WDS). APs must register to the WDS for fast roaming to work. CCKM is also supported on the Cisco
Unified Wireless LAN Controller alone.
The Cisco Desktop Collaboration Experience DX650 supports CCKM with 802.1X+WEP or WPA(TKIP)
only. CCKM is not supported with WPA2 or WPA(AES). For details about CCKM, see the Cisco Fast Secure
Roaming Application Note at:
http://www.cisco.com/en/US/products/hw/wireless/ps4570/prod_technical_reference09186a00801c5223.html
Related Topics
Voice QoS in Wireless Network, on page 83
VoIP WLAN Deployment, on page 93
Bluetooth Wireless Technology
Bluetooth enables low-bandwidth wireless connections within a range of 30 feet (10 meters). The best
performance is in the 3- to 6-foot (1- to 2-meter) range. Bluetooth wireless technology operates in the 2.4
GHz band, which is the same as the 802.11b/g band. Interference issues can occur. We recommend that you:
•
Use 802.11a that operates in the 5 GHz band.
•
Reduce the proximity of other 802.11b/g devices, Bluetooth devices, microwave ovens, and large metal
objects.
For more information about configuring Bluetooth on Cisco Desktop Collaboration Experience DX650, see
the Bluetooth Settings Menu, on page 103. For more information about using Bluetooth headsets with your
Cisco Desktop Collaboration Experience DX650, see Handsfree Profile, on page 55 and the Bluetooth
Cisco Desktop Collaboration Experience DX650 Administration Guide, Release 10.1(1)
81
Bluetooth Wireless Technology
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