[cisco-voip] 7920's and battery life depending on Wireless encryption type?

[Matthew Saskin]

No hard evidence, but it would only make sense that different encryption 
methods require different CPU utilization, which could have significant 
impact on the battery life of a mobile device.  Then again, they could 
have dedicated hardware to this which breaks my theory :)

Another thing to consider is how frequently the device is re-keying 
against the wireless network, as well as how frequently it is re-homing 
to new AP's, etc.

-matt

Erick Bergquist wrote:
> Does anyone have any input on the impact different wireless encryption
> settings have on 7920 battery life?
> 
> I have a client that uses 128 bit WPA encryption on 7920s with the
> cmterm_7920.4.0-03-02 firmware, and when the phones are up and
> registered the battery lasts about 3 hrs when the phone is just
> sitting there idle waiting for calls, etc.
> 
> I took another 7920 phone there, and it does the same thing.  I had
> left the site with a full charge on the 7920 and nearly 7 hours later
> the phone still has one third of battery left but is not authenticated
> to any wireless network and is sitting here trying to authenticate and
> has been on since I left there so it doesn't appear to be a battery
> issue but maybe something to do when it is up and running.
> 
> Thanks, Erick
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