[cisco-voip] 8851 - power draw

[Lelio Fulgenzi]

OK, I think I found what I was looking for.

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https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst9300/software/release/16-9/configuration_guide/int_hw/b_169_int_and_hw_9300_cg/configuring_poe.html

If the device discovers a powered device connected to the port and if the device has enough power, it grants power, updates the power budget, turns on power to the port on a first-come, first-served basis, and updates the LEDs.

If granting power would exceed the system power budget, the device denies power, ensures that power to the port is turned off, generates a syslog message, and updates the LEDs. After power has been denied, the device periodically rechecks the power budget and continues to attempt to grant the request for power.
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I'll have to see if there are similar POE configuration statements for AUTO for the other switches to be 100% sure, but I suspect they do.



From: Lelio Fulgenzi
Sent: Friday, February 7, 2020 1:12 PM
To: voyp list, cisco-voip (cisco-voip at puck.nether.net) <cisco-voip at puck.nether.net>
Subject: RE: 8851 - power draw


Does anyone have any experience with the bootup process of a switch packed with phones asking for 30W and being more than the available power?

Do they cycle through startup accordingly?



From: cisco-voip <cisco-voip-bounces at puck.nether.net<mailto:cisco-voip-bounces at puck.nether.net>> On Behalf Of Lelio Fulgenzi
Sent: Thursday, February 6, 2020 6:12 PM
To: voyp list, cisco-voip (cisco-voip at puck.nether.net<mailto:cisco-voip at puck.nether.net>) <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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