[cisco-voip] 7940 Power Save Mode

Tue Mar 23 18:32:16 EDT 2010

1. Sorry I am confused about your 15 x 100W comment. I don't see how turning off 15 phones is like "turning off 15x100w bulbs for 12 hours at a time". Which phones are you talking about? You aren't saying the phones take 100W per port are you? That is more than the 802.3ad POE max of 15.4/12.95 W per port. You must mean per switch?

2. In an idea world Cisco phones would have a hardware architecture were most of the phone can go to sleep and just the Ethernet chip and it's associated circuitry (POE, on-hook-switch, Display button, ...) can be powered and in POE power class 1. The phones watches for a Wake-on-LAN Ethernet packet, off hook, or Display Button depress event which then powers up the rest of the phone and it moves up to POE class 2,3 or 4 if it needs to. I don't see any reason why this couldn't work for incoming calls as well. This technology (Ethernet chips with Wake-on-LAN) has been around for a long time. I wish all Cisco phones worked this way.

3. I would also like to point out that while powering off phones does indeed save power, there are people that work outside normal hours and if their were to be a medical emergency and all the phones are turned off at the switchport that could be a bad thing for everyone involved.

leb

At 4:47 PM -0400 3/23/10, Wes Sisk wrote:
>We attached a Kill-A-Watt to the switch powering phones in an engineers cube.  When the EEM script triggers switch power consumption drops by ~100W.  x 15 engineers in our area that is turning off 15x100w bulbs for 12 hours at a time.  The major impediment with that approach is the phones are hard down and do not respond to user input. 
>
>A solution that that provides similar level of power consumption while enabling user intervention would be best of both worlds.  Save power, save on cooling, save backlights, extremely nominal user impact = win.
>
>/Wes
>
>On Tuesday, March 23, 2010 1:50:53 PM, Fuermann, Jason <mailto:JBF005 at shsu.edu><JBF005 at shsu.edu> wrote:
>
>>I guess the question really is, what is the end goal of putting the rest of your phones in power save some kind of power save mode?
>>
>> 
>>
>>From: Chris Ward (chrward) [<mailto:chrward at cisco.com>mailto:chrward at cisco.com]
>>Sent: Tuesday, March 23, 2010 12:22 PM
>>To: Fuermann, Jason; Ryan Ratliff (rratliff); Matthew Loraditch
>>Cc: <mailto:cisco-voip at puck.nether.net>cisco-voip at puck.nether.net; Jamie Weatherhead
>>Subject: RE: [cisco-voip] 7940 Power Save Mode
>>
>> 
>>
>>Energywise support is not yet available on our phones. You can use Energywise to shutdown switchports, but not put the phones to sleepŠ YET.
>>
>> 
>>
>>When energywise is supported on the phones, it will have the ability to put them into a deep-sleep mode. It will however not be supported on the 7940/60s.
>>
>> 
>>
>>+Chris
>>
>> 
>>
>>From: <mailto:cisco-voip-bounces at puck.nether.net>cisco-voip-bounces at puck.nether.net [<mailto:cisco-voip-bounces at puck.nether.net>mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Fuermann, Jason
>>Sent: Tuesday, March 23, 2010 10:53 AM
>>To: Fuermann, Jason; Ryan Ratliff (rratliff); Matthew Loraditch
>>Cc: <mailto:cisco-voip at puck.nether.net>cisco-voip at puck.nether.net; Jamie Weatherhead
>>Subject: Re: [cisco-voip] 7940 Power Save Mode
>>
>> 
>>
>>Sorry, I was thinking of EnergyWise, not EEM
>>
>> 
>>
>>From: <mailto:cisco-voip-bounces at puck.nether.net>cisco-voip-bounces at puck.nether.net [<mailto:cisco-voip-bounces at puck.nether.net>mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Fuermann, Jason
>>Sent: Tuesday, March 23, 2010 9:43 AM
>>To: 'Ryan Ratliff'; Matthew Loraditch
>>Cc: <mailto:cisco-voip at puck.nether.net>cisco-voip at puck.nether.net; Jamie Weatherhead
>>Subject: Re: [cisco-voip] 7940 Power Save Mode
>>
>> 
>>
>>I'm sure EEM has some interface a standard user could interact with
>>
>> 
>>
>>From: <mailto:cisco-voip-bounces at puck.nether.net>cisco-voip-bounces at puck.nether.net [<mailto:cisco-voip-bounces at puck.nether.net>mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Ryan Ratliff
>>Sent: Tuesday, March 23, 2010 9:42 AM
>>To: Matthew Loraditch
>>Cc: <mailto:cisco-voip at puck.nether.net>cisco-voip at puck.nether.net; Jamie Weatherhead
>>Subject: Re: [cisco-voip] 7940 Power Save Mode
>>
>> 
>>
>>You telnet in to the switch and do a 'no shut'.  We control the switches here in our cubes that power all of the phones.
>>
>> 
>>
>>-Ryan
>>
>> 
>>
>>On Mar 23, 2010, at 10:31 AM, Matthew Loraditch wrote:
>>
>> 
>>
>>How does that work if you need to work late or come in on off hours ?
>>
>> 
>>
>> 
>>
>>Matthew Loraditch, CCNA, CCDA
>>1965 Greenspring Drive
>>
>>Timonium, MD 21093 
>><mailto:support at heliontechnologies.com>support at heliontechnologies.com
>>(p) (410) 252-8830
>>(F) (443) 541-1593
>>
>>Visit us at <http://www.heliontechnologies.com/>www.heliontechnologies.com 
>>Support Issue? Email <mailto:support at heliontechnologies.com>support at heliontechnologies.com for fast assistance!
>>
>> 
>>
>>From: <mailto:cisco-voip-bounces at puck.nether.net>cisco-voip-bounces at puck.nether.net [<mailto:cisco-voip-bounces at puck.nether.net>mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Wes Sisk
>>Sent: Tuesday, March 23, 2010 10:27 AM
>>To: Matthew Ballard
>>Cc: <mailto:cisco-voip at puck.nether.net>cisco-voip at puck.nether.net; Jamie Weatherhead
>>Subject: Re: [cisco-voip] 7940 Power Save Mode
>>
>> 
>>
>>We implement an alternate powersave method on the phones at our desks. We use EEM script on switch to shutdown power to all non-critical phones outside business hours.  EEM script is available in the EEM script repository on <http://Cisco.com>Cisco.com.
>>
>>/Wes
>>
>>On Monday, March 22, 2010 12:48:36 PM, Matthew Ballard <mailto:mballard at otis.edu><mballard at otis.edu> wrote:
>>
>>The only reason the 7970 would need a power save mode is to turn off the backlight.  Since the 7940 doesn't have a backlight, a power save mode would save little to no power anyways.
>>
>> 
>>
>>Matthew Ballard
>>
>> 
>>
>> 
>>
>>From: <mailto:cisco-voip-bounces at puck.nether.net>cisco-voip-bounces at puck.nether.net [<mailto:cisco-voip-bounces at puck.nether.net>mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Jamie Weatherhead
>>Sent: Monday, March 22, 2010 9:42 AM
>>To: <mailto:cisco-voip at puck.nether.net>cisco-voip at puck.nether.net
>>Subject: [cisco-voip] 7940 Power Save Mode
>>
>> 
>>
>>Afternoon all,
>>
>> 
>>
>>Is it at all possible to set a 7940 phone to power save mode?
>>
>> 
>>
>>I am able to achieve this for a 7970 phone by adjusting the 'Display Idle Timeout' setting on the phone device configuration page. However, the 7940 phone doesn't appear to have these settings as seen below:
>>
>><image001.png>
>>
>>Any help would be appreciated.
>>
>> 
>>
>>Jamie
>>
>>
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-- 
leb at iridescent.org