Ap, Channel, And Domain Relationships; Wlans And Roaming; Bluetooth Wireless Technology - Cisco 8961 Administration Manual

Chapter 6 Understanding the VoIP Wireless Network

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
non-overlapping channels for each AP. The recommended channels for 802.11b and 802.11g in North
America are 1, 6, and 11.
In a non controller-based wireless network, we recommend that you statically configure channels for
Note
each AP. If your wireless network uses a controller, use the Auto-RF feature with minimal voice
disruption.
For more information about APs, see the
For more information about AP, channel and domain relationships, see
Wireless LAN Deployment

WLANs and Roaming

The Cisco Unified IP Phone 9971 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 Unified IP Phone 9971 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_reference09186a00801c522
3.html
Related Topics
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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. There can be a potential interference issues. We
recommend that you:
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For more information about using Bluetooth headsets with your Cisco Unified IP Phone, see the
Bluetooth Wireless Headsets" section on page
Cisco Unified IP Phone 8961, 9951, and 9971 Administration Guide for Cisco Unified Communications Manager 8.6 (SIP)
Guide.
Voice QoS in a Wireless Network, page 6-9
VoIP WLAN Configuration, page 6-15
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.
"VoIP WLAN Configuration" section on page
3-8.
Bluetooth Wireless Technology
6-15.
Cisco Unified IP Phone 9971
"Using
6-7