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

[Jonathan Charles]

I think there is a bizarre EM field on site that sucks all batteries dead...

I would probably check any large diesel engines (this is an auto-parts
place...) and maybe check for possible disruptions in localized
planetary gravity and probable space-time fluctuations in nearby
Einstein-Rosen bridge fields...

Or.

They offended god in some way; and god used all of his creativity
making the giraffe and duck-billed platypus and is out of ideas (or
maybe his heart just ain't in it anymore...)

Actually, the EM thing makes more sense... some 2.4Ghz freq is hitting
this phone and beating the crap out of it... (wireless analogs?
microwave ovens?)




Jonathan

On Tue, Mar 25, 2008 at 1:09 PM, Matthew Saskin <matt at saskin.net> wrote:
> 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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