If the access point does not support CCX Proxy ARP, then the phone must wake up at each DTIM period.
Frequent wakeups can reduce the idle battery life by as much as 50%.
•
We recommend that you use an access point that supports the Cisco Compatible Extensions (CCX)
Dynamic Transmit Power Control (DTPC) feature. When DTPC is enabled, the access point advertises
its transmit power to all clients. The phone adjusts its transmit power to the minimum level necessary
to communicate with the access point. A lower transmit power reduces unnecessary noise in other areas.
•
Limit the use of multicast. If the phone subscribes to a multicast stream, it wakes up at each DTIM period
to receive multicast frames. Frequent wake-ups cause power consumption to increase.
•
Select an access point that supports U-APSD. This power save protocol is used when on call and when
idle.
◦
The On Call Power Save field in the Wi-Fi Profile should remain enabled so that the phone can
use U-APSD.
◦
If the On Call Power Save field is disabled, then the phone uses active mode when on call, but
uses U-APSD when in idle mode.
Only disable On Call Power Save for troubleshooting purposes.
New and Changed Information
Changes for Firmware Release 11.0(3)
The following table contains the information that was added or changed in this book for this firmware release.
UpdatesFeature
Product Specific Configuration Fields, on page 47
Enable FIPS Mode, on page 55
FIPS 140-2 Level 1 Support
Best Practices for Battery Power Conservation, on
page 8
Power Saving Enhancements
Phone Firmware
The factory installs a version of the phone firmware on the phone during manufacturing. But that firmware
may not be the latest firmware version.
Your Cisco Unified Communications Manager stores the firmware loads. If the version of firmware on the
phone is not the latest version, the Cisco Unified Communications Manager sends the updated firmware load
to the phone.
Cisco Wireless IP Phone 8821 and 8821-EX Administration Guide for Cisco Unified Communications Manager
10
Your Phone
New and Changed Information
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