[cisco-voip] 8851 - power draw

[Lelio Fulgenzi]

Come to think of it... we’d need to know if your 8851s are the pre-v8 hardware or v8 or above.

V8 they went from class 3 to class 4.



Sent from my iPhone

On Feb 6, 2020, at 7:33 PM, Lelio Fulgenzi <lelio at uoguelph.ca<mailto:lelio at uoguelph.ca>> wrote:


That would be great.

We’re concerned with out of the box 8851s. No side cars. Maybe add a few watts for USB powering of devices.

We understand that they may request 30w on power up, then revert down to ~15w. Which means phones may not all come up at once if our power supplies are not sufficient.

But as long as there’s sufficient normal operating power, we should be good.

Complicating factor is we have APs to contend with as well. They’re sucking power, too!

Thanks again.

Sent from my iPhone

On Feb 6, 2020, at 6:57 PM, Pawlowski, Adam <ajp26 at buffalo.edu<mailto:ajp26 at buffalo.edu>> wrote:


Sure, I can do that for you in the morning.


Check the datasheet on the KEM as well - those draw different power. The A-KEM is supported with 1 per, BEKEM with 2 (big easy is BE, code name for the model).


If you're running gear with a low budget, "show power inline <interface> detail" tells you what it's actually drawn, in case you need to dip into manual policing. The LLDP-MED/CDP power request values can be higher than what it really needs.

________________________________
From: cisco-voip <cisco-voip-bounces at puck.nether.net<mailto:cisco-voip-bounces at puck.nether.net>> on behalf of Lelio Fulgenzi <lelio at uoguelph.ca<mailto:lelio at uoguelph.ca>>
Sent: Thursday, February 6, 2020 6:11 PM
To: voyp list, cisco-voip (cisco-voip at puck.nether.net<mailto:cisco-voip at puck.nether.net>)
Subject: [cisco-voip] 8851 - power draw


Does anyone have a bunch of 8851s deployed? Can I trouble you for a “show inline power” output? I’m looking for what normal operating power draw is for this model. No side cars, no USB, sort of thing.

I’ve got an 8865 showing 12.9W, and I’m hoping it’s less. We’re looking at selecting 8841 or 8851 and power draw is a concern. Startup too, but apparently, startup will cycle through.

Lelio

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