Re: [cisco-voip] 8851 - power draw

[Lelio Fulgenzi]

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

---
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.
---

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@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 
mailto:cisco-voip-boun...@puck.nether.net>> 
On Behalf Of Lelio Fulgenzi
Sent: Thursday, February 6, 2020 6:12 PM
To: voyp list, cisco-voip 
(cisco-voip@puck.nether.net<mailto:cisco-voip@puck.nether.net>) 
mailto:cisco-voip@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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Re: [cisco-voip] 8851 - power draw

[Lelio Fulgenzi]

This is incredible! Thanks everyone!

From: Pawlowski, Adam 
Sent: Friday, February 7, 2020 11:08 AM
To: 'Terry Oakley' ; Lelio Fulgenzi 
; Biffle, Gerrad 
Cc: Cisco-VOIP 
Subject: RE: [cisco-voip] 8851 - power draw

Sorry for the delay, been a busy morning.

Hardware revs changed at some point including the device’s PoE class to go with 
it.

This is from my notes:

Phone   # of KEM  PoE? (802.3at)
8851   1 BEKEM or AKEM   Yes
8851   2 AKEMNo
8851   2 BEKEM  Yes* Only with v08 or later 
hardware - see back of phone
8861   1 BEKEM or AKEM   Yes
8861   2 BEKEM or AKEM   Yes, but USB Fast Charging is disabled on 
rear port
8861   3 BEKEM or AKEM   Yes, but USB Fast Charging is disabled on 
rear port

Anyways here are some power stats:

Hardware V01 with a BEKEM

Interface: Gi2/0/23
Inline Power Mode: auto
Operational status: on
Device Detected: yes
Device Type: Cisco IP Phone 8851
IEEE Class: 3
Discovery mechanism used/configured: Ieee and Cisco
Police: off

Power Allocated
Admin Value: 60.0
Power drawn from the source: 12.6
Power available to the device: 12.6

Actual consumption
Measured at the port: 7.4
Maximum Power drawn by the device since powered on: 8.3

Hardware V01 with no KEM

Interface: Te4/0/46
Inline Power Mode: auto
Operational status: on
Device Detected: yes
Device Type: Cisco IP Phone 8851
IEEE Class: 3
Discovery mechanism used/configured: Ieee and Cisco
Police: off

Power Allocated
Admin Value: 60.0
Power drawn from the source: 9.2
Power available to the device: 9.2

Actual consumption
Measured at the port: 3.4
Maximum Power drawn by the device since powered on: 5.4

Hardware V31 with a BEKEM

Interface: Gi2/0/20
Inline Power Mode: auto
Operational status: on
Device Detected: yes
Device Type: Cisco IP Phone 8851
IEEE Class: 4
Discovery mechanism used/configured: Ieee and Cisco
Police: off

Power Allocated
Admin Value: 60.0
Power drawn from the source: 12.3
Power available to the device: 12.3

Actual consumption
Measured at the port: 7.8
Maximum Power drawn by the device since powered on: 8.4

Hardware V31 with an A-KEM

Interface: Gi1/0/4
Inline Power Mode: auto
Operational status: on
Device Detected: yes
Device Type: Cisco IP Phone 8851
IEEE Class: 4
Discovery mechanism used/configured: Ieee and Cisco
Police: off

Power Allocated
Admin Value: 60.0
Power drawn from the source: 12.3
Power available to the device: 12.3

Actual consumption
Measured at the port: 7.0
Maximum Power drawn by the device since powered on: 7.4

Hardware V31 with no KEM

Interface: Gi1/0/15
Inline Power Mode: auto
Operational status: on
Device Detected: yes
Device Type: Cisco IP Phone 8851
IEEE Class: 4
Discovery mechanism used/configured: Ieee and Cisco
Police: off

Power Allocated
Admin Value: 60.0
Power drawn from the source: 8.9
Power available to the device: 8.9

Actual consumption
Measured at the port: 3.7
Maximum Power drawn by the device since powered on: 4.7






From: cisco-voip 
mailto:cisco-voip-boun...@puck.nether.net>> 
On Behalf Of Terry Oakley
Sent: Friday, February 7, 2020 10:39 AM
To: Lelio Fulgenzi mailto:le...@uoguelph.ca>>; Biffle, 
Gerrad mailto:gerrad.bif...@greensboro-nc.gov>>
Cc: Cisco-VOIP mailto:cisco-voip@puck.nether.net>>
Subject: Re: [cisco-voip] 8851 - power draw

On a quick test our 8851 draws 15.4 on boot and settles back to 9.8 at rest.

Terry

From: cisco-voip 
mailto:cisco-voip-boun...@puck.nether.net>> 
On Behalf Of Lelio Fulgenzi
Sent: Friday, February 7, 2020 7:47 AM
To: Biffle, Gerrad 
mailto:gerrad.bif...@greensboro-nc.gov>>
Cc: Cisco-VOIP mailto:cisco-voip@puck.nether.net>>
Subject: Re: [cisco-voip] 8851 - power draw

CAUTION: This email is from an external source. Do not click links or open 
attachments unless you recognize the sender and know the content is safe.
Hey Thanks! This does help.

Do you know if the ones drawing more than 9.4 have a KEM?

From: Biffle, Gerrad 
mailto:gerrad.bif...@greensboro-nc.gov>>
Sent: Friday, February 7, 2020 9:44 AM
To: Lelio Fulgenzi mailto:le...@uoguelph.ca>>
Cc: Cisco-VOIP mailto:cisco-voip@puck.nether.net>>
Subject: Re: [cisco-voip] 8851 - power draw

Don’t know if you still need it or not.  Here is a quick grab from one of our 
switches:

Interface Admin  OperPower(Watts) Device  Class
From PSTo Device
- -- -- -- -- --- -

Gi2/17auto   on 14.5   13.8   IP Phone 8851   3
Gi2/18auto   on 9.48.9IP Phone 8851   4
Gi2/19auto   on 12.9   12.3   IP Phone 8851   4
Gi2/20auto   on 9.48.9IP Phone 8851   4
Gi2/21auto   off0.00.0n/a n/a
Gi2/22auto   off0.00.0n/a n/

Re: [cisco-voip] 8851 - power draw

[Pawlowski, Adam]

Sorry for the delay, been a busy morning.

Hardware revs changed at some point including the device’s PoE class to go with 
it.

This is from my notes:

Phone   # of KEM  PoE? (802.3at)
8851   1 BEKEM or AKEM   Yes
8851   2 AKEMNo
8851   2 BEKEM  Yes* Only with v08 or later 
hardware - see back of phone
8861   1 BEKEM or AKEM   Yes
8861   2 BEKEM or AKEM   Yes, but USB Fast Charging is disabled on 
rear port
8861   3 BEKEM or AKEM   Yes, but USB Fast Charging is disabled on 
rear port

Anyways here are some power stats:

Hardware V01 with a BEKEM

Interface: Gi2/0/23
Inline Power Mode: auto
Operational status: on
Device Detected: yes
Device Type: Cisco IP Phone 8851
IEEE Class: 3
Discovery mechanism used/configured: Ieee and Cisco
Police: off

Power Allocated
Admin Value: 60.0
Power drawn from the source: 12.6
Power available to the device: 12.6

Actual consumption
Measured at the port: 7.4
Maximum Power drawn by the device since powered on: 8.3

Hardware V01 with no KEM

Interface: Te4/0/46
Inline Power Mode: auto
Operational status: on
Device Detected: yes
Device Type: Cisco IP Phone 8851
IEEE Class: 3
Discovery mechanism used/configured: Ieee and Cisco
Police: off

Power Allocated
Admin Value: 60.0
Power drawn from the source: 9.2
Power available to the device: 9.2

Actual consumption
Measured at the port: 3.4
Maximum Power drawn by the device since powered on: 5.4

Hardware V31 with a BEKEM

Interface: Gi2/0/20
Inline Power Mode: auto
Operational status: on
Device Detected: yes
Device Type: Cisco IP Phone 8851
IEEE Class: 4
Discovery mechanism used/configured: Ieee and Cisco
Police: off

Power Allocated
Admin Value: 60.0
Power drawn from the source: 12.3
Power available to the device: 12.3

Actual consumption
Measured at the port: 7.8
Maximum Power drawn by the device since powered on: 8.4

Hardware V31 with an A-KEM

Interface: Gi1/0/4
Inline Power Mode: auto
Operational status: on
Device Detected: yes
Device Type: Cisco IP Phone 8851
IEEE Class: 4
Discovery mechanism used/configured: Ieee and Cisco
Police: off

Power Allocated
Admin Value: 60.0
Power drawn from the source: 12.3
Power available to the device: 12.3

Actual consumption
Measured at the port: 7.0
Maximum Power drawn by the device since powered on: 7.4

Hardware V31 with no KEM

Interface: Gi1/0/15
Inline Power Mode: auto
Operational status: on
Device Detected: yes
Device Type: Cisco IP Phone 8851
IEEE Class: 4
Discovery mechanism used/configured: Ieee and Cisco
Police: off

Power Allocated
Admin Value: 60.0
Power drawn from the source: 8.9
Power available to the device: 8.9

Actual consumption
Measured at the port: 3.7
Maximum Power drawn by the device since powered on: 4.7






From: cisco-voip  On Behalf Of Terry Oakley
Sent: Friday, February 7, 2020 10:39 AM
To: Lelio Fulgenzi ; Biffle, Gerrad 

Cc: Cisco-VOIP 
Subject: Re: [cisco-voip] 8851 - power draw

On a quick test our 8851 draws 15.4 on boot and settles back to 9.8 at rest.

Terry

From: cisco-voip 
mailto:cisco-voip-boun...@puck.nether.net>> 
On Behalf Of Lelio Fulgenzi
Sent: Friday, February 7, 2020 7:47 AM
To: Biffle, Gerrad 
mailto:gerrad.bif...@greensboro-nc.gov>>
Cc: Cisco-VOIP mailto:cisco-voip@puck.nether.net>>
Subject: Re: [cisco-voip] 8851 - power draw

CAUTION: This email is from an external source. Do not click links or open 
attachments unless you recognize the sender and know the content is safe.

Hey Thanks! This does help.

Do you know if the ones drawing more than 9.4 have a KEM?

From: Biffle, Gerrad 
mailto:gerrad.bif...@greensboro-nc.gov>>
Sent: Friday, February 7, 2020 9:44 AM
To: Lelio Fulgenzi mailto:le...@uoguelph.ca>>
Cc: Cisco-VOIP mailto:cisco-voip@puck.nether.net>>
Subject: Re: [cisco-voip] 8851 - power draw

Don’t know if you still need it or not.  Here is a quick grab from one of our 
switches:

Interface Admin  OperPower(Watts) Device  Class
From PSTo Device
- -- -- -- -- --- -

Gi2/17auto   on 14.5   13.8   IP Phone 8851   3
Gi2/18auto   on 9.48.9IP Phone 8851   4
Gi2/19auto   on 12.9   12.3   IP Phone 8851   4
Gi2/20auto   on 9.48.9IP Phone 8851   4
Gi2/21auto   off0.00.0n/a n/a
Gi2/22auto   off0.00.0n/a n/a
Gi2/23auto   on 9.48.9IP Phone 8851   4
Gi2/24auto   on 10.3   9.8IP Phone 8851   3
Gi2/25auto   on 10.3   9.8IP Phone 8851   3
Gi2/26auto   on 9.48.9IP Phone 8851   4
Gi2/27auto   on 6.66.3IP Phone 7962   2
Gi2/28auto   on

Re: [cisco-voip] 8851 - power draw

[Terry Oakley]

On a quick test our 8851 draws 15.4 on boot and settles back to 9.8 at rest.  

 

Terry

 

From: cisco-voip  On Behalf Of Lelio 
Fulgenzi
Sent: Friday, February 7, 2020 7:47 AM
To: Biffle, Gerrad 
Cc: Cisco-VOIP 
Subject: Re: [cisco-voip] 8851 - power draw

 


CAUTION: This email is from an external source. Do not click links or open 
attachments unless you recognize the sender and know the content is safe.

Hey Thanks! This does help.

 

Do you know if the ones drawing more than 9.4 have a KEM? 

 

From: Biffle, Gerrad mailto:gerrad.bif...@greensboro-nc.gov> > 
Sent: Friday, February 7, 2020 9:44 AM
To: Lelio Fulgenzi mailto:le...@uoguelph.ca> >
Cc: Cisco-VOIP mailto:cisco-voip@puck.nether.net> >
Subject: Re: [cisco-voip] 8851 - power draw

 

Don’t know if you still need it or not.  Here is a quick grab from one of our 
switches: 

 

Interface Admin  OperPower(Watts) Device  Class

From PSTo Device

- -- -- -- -- --- -

 

Gi2/17auto   on 14.5   13.8   IP Phone 8851   3

Gi2/18auto   on 9.48.9IP Phone 8851   4

Gi2/19auto   on 12.9   12.3   IP Phone 8851   4

Gi2/20auto   on 9.48.9IP Phone 8851   4

Gi2/21auto   off0.00.0n/a n/a

Gi2/22auto   off0.00.0n/a n/a

Gi2/23auto   on 9.48.9IP Phone 8851   4

Gi2/24auto   on 10.3   9.8IP Phone 8851   3

Gi2/25auto   on 10.3   9.8IP Phone 8851   3

Gi2/26auto   on 9.48.9IP Phone 8851   4

Gi2/27auto   on 6.66.3IP Phone 7962   2

Gi2/28auto   on 9.48.9IP Phone 8851   4

Gi2/29auto   on 10.3   9.8IP Phone 8851   3

 

 

On Feb 6, 2020, at 6:11 PM, Lelio Fulgenzi mailto:le...@uoguelph.ca> > wrote:

 

 

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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Re: [cisco-voip] 8851 - power draw

[Lelio Fulgenzi]

Hey Thanks! This does help.

Do you know if the ones drawing more than 9.4 have a KEM?

From: Biffle, Gerrad 
Sent: Friday, February 7, 2020 9:44 AM
To: Lelio Fulgenzi 
Cc: Cisco-VOIP 
Subject: Re: [cisco-voip] 8851 - power draw

Don’t know if you still need it or not.  Here is a quick grab from one of our 
switches:

Interface Admin  OperPower(Watts) Device  Class
From PSTo Device
- -- -- -- -- --- -

Gi2/17auto   on 14.5   13.8   IP Phone 8851   3
Gi2/18auto   on 9.48.9IP Phone 8851   4
Gi2/19auto   on 12.9   12.3   IP Phone 8851   4
Gi2/20auto   on 9.48.9IP Phone 8851   4
Gi2/21auto   off0.00.0n/a n/a
Gi2/22auto   off0.00.0n/a n/a
Gi2/23auto   on 9.48.9IP Phone 8851   4
Gi2/24auto   on 10.3   9.8IP Phone 8851   3
Gi2/25auto   on 10.3   9.8IP Phone 8851   3
Gi2/26auto   on 9.48.9IP Phone 8851   4
Gi2/27auto   on 6.66.3IP Phone 7962   2
Gi2/28auto   on 9.48.9IP Phone 8851   4
Gi2/29auto   on 10.3   9.8IP Phone 8851   3



On Feb 6, 2020, at 6:11 PM, Lelio Fulgenzi 
mailto:le...@uoguelph.ca>> wrote:


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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Re: [cisco-voip] 8851 - power draw

[Lelio Fulgenzi]

Hi! Thanks for this. Your data matches up pretty good with the docs I see for 
the 8845. No need to grab the 8865. I’ve got one of those I’m looking at too. 
Power draw goes up with a sidecar. 4W by my records to 16.9W – which means no 
go on af only ports without power cube. Me thnks.




From: Charles Goldsmith 
Sent: Friday, February 7, 2020 8:46 AM
To: Lelio Fulgenzi 
Cc: voyp list, cisco-voip (cisco-voip@puck.nether.net) 

Subject: Re: [cisco-voip] 8851 - power draw

I have a single 8845 here in my office, on a 2960 switch.  It was manufactured 
09/19 per the box.  My 2960 is reporting it as a class 2 and it's drawing 7w 
with power/screen on.Just to give you a bit more data.  I don't have an 
8851 here.  My 8865 is on wifi and in the other office, but if you want 
correlating data, I can go grab it.  The 8845 is on 12.7, the 8865 is currently 
connected to Webex, so whatever code they push, I'd have to go look.

office-2960#sh power inline g1/0/8
Interface Admin  Oper (W) Power   Device  Class Max
- -- -- --- --- - 
Gi1/0/8   auto   on 7.0 IP Phone 8845   2 30.0

Interface  AdminPowerMax   AdminConsumption
 (Watts)   (Watts)
-- --- 
Gi1/0/8   30.0 15.4


On Thu, Feb 6, 2020 at 5:11 PM Lelio Fulgenzi 
mailto:le...@uoguelph.ca>> wrote:

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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Re: [cisco-voip] 8851 - power draw

[Biffle, Gerrad]

Don’t know if you still need it or not.  Here is a quick grab from one of our 
switches:

Interface Admin  OperPower(Watts) Device  Class
From PSTo Device
- -- -- -- -- --- -

Gi2/17auto   on 14.5   13.8   IP Phone 8851   3
Gi2/18auto   on 9.48.9IP Phone 8851   4
Gi2/19auto   on 12.9   12.3   IP Phone 8851   4
Gi2/20auto   on 9.48.9IP Phone 8851   4
Gi2/21auto   off0.00.0n/a n/a
Gi2/22auto   off0.00.0n/a n/a
Gi2/23auto   on 9.48.9IP Phone 8851   4
Gi2/24auto   on 10.3   9.8IP Phone 8851   3
Gi2/25auto   on 10.3   9.8IP Phone 8851   3
Gi2/26auto   on 9.48.9IP Phone 8851   4
Gi2/27auto   on 6.66.3IP Phone 7962   2
Gi2/28auto   on 9.48.9IP Phone 8851   4
Gi2/29auto   on 10.3   9.8IP Phone 8851   3


On Feb 6, 2020, at 6:11 PM, Lelio Fulgenzi 
mailto:le...@uoguelph.ca>> wrote:


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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Re: [cisco-voip] 8851 - power draw

[Charles Goldsmith]

I have a single 8845 here in my office, on a 2960 switch.  It was
manufactured 09/19 per the box.  My 2960 is reporting it as a class 2 and
it's drawing 7w with power/screen on.Just to give you a bit more data.
I don't have an 8851 here.  My 8865 is on wifi and in the other office, but
if you want correlating data, I can go grab it.  The 8845 is on 12.7, the
8865 is currently connected to Webex, so whatever code they push, I'd have
to go look.

office-2960#sh power inline g1/0/8
Interface Admin  Oper (W) Power   Device  Class Max
- -- -- --- --- - 
Gi1/0/8   auto   on 7.0 IP Phone 8845   2 30.0

Interface  AdminPowerMax   AdminConsumption
 (Watts)   (Watts)
-- --- 
Gi1/0/8   30.0 15.4


On Thu, Feb 6, 2020 at 5:11 PM Lelio Fulgenzi  wrote:

>
> 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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Re: [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 
mailto:le...@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 
mailto:aj...@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  
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 
mailto:cisco-voip-boun...@puck.nether.net>> 
on behalf of Lelio Fulgenzi mailto:le...@uoguelph.ca>>
Sent: Thursday, February 6, 2020 6:11 PM
To: voyp list, cisco-voip 
(cisco-voip@puck.nether.net<mailto:cisco-voip@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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Re: [cisco-voip] 8851 - power draw

[Lelio Fulgenzi]

Ah. Yes. I saw that. Unbroken Link below for those interested.

Issue is, it’s an old doc and has the 8851 listed as class 3.

8851s are now class 4.

IEEE Power over Ethernet class 3 for hardware version prior to V08, class 4 for 
hardware version V08 and above. (From Data sheet and other newer sources).


https://www.cisco.com/c/en/us/products/collateral/collaboration-endpoints/unified-ip-phone-6900-series/solution_overview_c22-589129.html


Sent from my iPhone

On Feb 6, 2020, at 7:04 PM, NateCCIE 
mailto:natec...@gmail.com>> wrote:

https://www.cisco.com/c/en/us/products/collateral/collaboration-endpoints/un
ified-ip-phone-6900-series/solution_overview_c22-589129.html


-Original Message-
From: cisco-voip 
mailto:cisco-voip-boun...@puck.nether.net>> 
On Behalf Of Lelio
Fulgenzi
Sent: Thursday, February 6, 2020 4:12 PM
To: voyp list, cisco-voip 
(cisco-voip@puck.nether.net<mailto:cisco-voip@puck.nether.net>)
mailto:cisco-voip@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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Re: [cisco-voip] 8851 - power draw

[Lelio Fulgenzi]

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 
mailto:aj...@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  
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 
mailto:cisco-voip-boun...@puck.nether.net>> 
on behalf of Lelio Fulgenzi mailto:le...@uoguelph.ca>>
Sent: Thursday, February 6, 2020 6:11 PM
To: voyp list, cisco-voip 
(cisco-voip@puck.nether.net<mailto:cisco-voip@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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Re: [cisco-voip] 8851 - power draw

[NateCCIE]

https://www.cisco.com/c/en/us/products/collateral/collaboration-endpoints/un
ified-ip-phone-6900-series/solution_overview_c22-589129.html


-Original Message-
From: cisco-voip  On Behalf Of Lelio
Fulgenzi
Sent: Thursday, February 6, 2020 4:12 PM
To: voyp list, cisco-voip (cisco-voip@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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Re: [cisco-voip] 8851 - power draw

[Pawlowski, Adam]

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  
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  on behalf of Lelio 
Fulgenzi 
Sent: Thursday, February 6, 2020 6:11 PM
To: voyp list, cisco-voip (cisco-voip@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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[cisco-voip] 8851 - power draw

[Lelio Fulgenzi]

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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