Specifications

Cisco Unified Wireless IP Phone 7921G Series Deployment Guide 35
Configuring Data Rates
It is recommended to disable rates below 12 Mbps for 802.11a and below 12 Mbps for 802.11b/g deployments where capacity
and range are factored in for best results.
If 802.11b clients are not allowed in the wireless LAN, then it is recommended to disable the 1, 2, 5.5, 11 Mbps data rates.
When 802.11b clients exist in the wireless network, then an 802.11b rate must be enabled and only an 802.11b rate can be
configured as a basic rate. In this case, is suggested to enable the data rates 11 Mbps and higher.
The recommended data rate configuration is the following:
802.11 Mode
Basic (Mandatory)
Data Rates
Supported (Optional)
Data Rates
Disabled
Data Rates
802.11a
12 Mbps
18 - 24, <36-54> Mbps
6, 9, <36-54> Mbps
802.11b
11 Mbps
None
1, 2, 5.5 Mbps
802.11g
12 Mbps
18 – 24, <36-54> Mbps
6, 9, <36-54> Mbps
802.11b/g
11 Mbps
12 – 24, <36-54> Mbps
1, 2, 5.5, 6, 9, <36-54> Mbps
Data rates higher than 24 Mbps (36, 48 and 54 Mbps) can optionally be enabled or disabled, but there is no advantage from a
capacity or throughput perspective to enable these rates for a voice application.