Mailing List Archive

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
Re: 8851 - power draw [ In reply to ]
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@puck.nether.net> on behalf of Lelio Fulgenzi <lelio@uoguelph.ca>
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
Re: 8851 - power draw [ In reply to ]
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 <cisco-voip-bounces@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)
<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 mailing list
cisco-voip@puck.nether.net
https://puck.nether.net/mailman/listinfo/cisco-voip
Re: 8851 - power draw [ In reply to ]
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@buffalo.edu<mailto:ajp26@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@puck.nether.net<mailto:cisco-voip-bounces@puck.nether.net>> on behalf of Lelio Fulgenzi <lelio@uoguelph.ca<mailto:lelio@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
Re: 8851 - power draw [ In reply to ]
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 <nateccie@gmail.com<mailto:nateccie@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 <cisco-voip-bounces@puck.nether.net<mailto:cisco-voip-bounces@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>)
<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
Re: 8851 - power draw [ In reply to ]
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@uoguelph.ca<mailto:lelio@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@buffalo.edu<mailto:ajp26@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@puck.nether.net<mailto:cisco-voip-bounces@puck.nether.net>> on behalf of Lelio Fulgenzi <lelio@uoguelph.ca<mailto:lelio@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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cisco-voip@puck.nether.net<mailto:cisco-voip@puck.nether.net>
https://puck.nether.net/mailman/listinfo/cisco-voip
Re: 8851 - power draw [ In reply to ]
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 <lelio@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
>
> _______________________________________________
> cisco-voip mailing list
> cisco-voip@puck.nether.net
> https://puck.nether.net/mailman/listinfo/cisco-voip
>
Re: 8851 - power draw [ In reply to ]
Don’t know if you still need it or not. Here is a quick grab from one of our switches:

Interface Admin Oper Power(Watts) Device Class
From PS To Device
--------- ------ ---------- ---------- ---------- ------------------- -----

Gi2/17 auto on 14.5 13.8 IP Phone 8851 3
Gi2/18 auto on 9.4 8.9 IP Phone 8851 4
Gi2/19 auto on 12.9 12.3 IP Phone 8851 4
Gi2/20 auto on 9.4 8.9 IP Phone 8851 4
Gi2/21 auto off 0.0 0.0 n/a n/a
Gi2/22 auto off 0.0 0.0 n/a n/a
Gi2/23 auto on 9.4 8.9 IP Phone 8851 4
Gi2/24 auto on 10.3 9.8 IP Phone 8851 3
Gi2/25 auto on 10.3 9.8 IP Phone 8851 3
Gi2/26 auto on 9.4 8.9 IP Phone 8851 4
Gi2/27 auto on 6.6 6.3 IP Phone 7962 2
Gi2/28 auto on 9.4 8.9 IP Phone 8851 4
Gi2/29 auto on 10.3 9.8 IP Phone 8851 3


On Feb 6, 2020, at 6:11 PM, Lelio Fulgenzi <lelio@uoguelph.ca<mailto:lelio@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

_______________________________________________
cisco-voip mailing list
cisco-voip@puck.nether.net<mailto:cisco-voip@puck.nether.net>
https://puck.nether.net/mailman/listinfo/cisco-voip

=======================================================
Please note that email sent to and from this address is subject
to the North Carolina Public Records Law and may be disclosed to third parties.
Re: 8851 - power draw [ In reply to ]
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 <w@woka.us>
Sent: Friday, February 7, 2020 8:46 AM
To: Lelio Fulgenzi <lelio@uoguelph.ca>
Cc: voyp list, cisco-voip (cisco-voip@puck.nether.net) <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 <lelio@uoguelph.ca<mailto:lelio@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

_______________________________________________
cisco-voip mailing list
cisco-voip@puck.nether.net<mailto:cisco-voip@puck.nether.net>
https://puck.nether.net/mailman/listinfo/cisco-voip
Re: 8851 - power draw [ In reply to ]
Hey Thanks! This does help.

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

From: Biffle, Gerrad <Gerrad.Biffle@greensboro-nc.gov>
Sent: Friday, February 7, 2020 9:44 AM
To: Lelio Fulgenzi <lelio@uoguelph.ca>
Cc: Cisco-VOIP <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 Oper Power(Watts) Device Class
From PS To Device
--------- ------ ---------- ---------- ---------- ------------------- -----

Gi2/17 auto on 14.5 13.8 IP Phone 8851 3
Gi2/18 auto on 9.4 8.9 IP Phone 8851 4
Gi2/19 auto on 12.9 12.3 IP Phone 8851 4
Gi2/20 auto on 9.4 8.9 IP Phone 8851 4
Gi2/21 auto off 0.0 0.0 n/a n/a
Gi2/22 auto off 0.0 0.0 n/a n/a
Gi2/23 auto on 9.4 8.9 IP Phone 8851 4
Gi2/24 auto on 10.3 9.8 IP Phone 8851 3
Gi2/25 auto on 10.3 9.8 IP Phone 8851 3
Gi2/26 auto on 9.4 8.9 IP Phone 8851 4
Gi2/27 auto on 6.6 6.3 IP Phone 7962 2
Gi2/28 auto on 9.4 8.9 IP Phone 8851 4
Gi2/29 auto on 10.3 9.8 IP Phone 8851 3



On Feb 6, 2020, at 6:11 PM, Lelio Fulgenzi <lelio@uoguelph.ca<mailto:lelio@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

_______________________________________________
cisco-voip mailing list
cisco-voip@puck.nether.net<mailto:cisco-voip@puck.nether.net>
https://puck.nether.net/mailman/listinfo/cisco-voip


=======================================================
Please note that email sent to and from this address is subject
to the North Carolina Public Records Law and may be disclosed to third parties.
Re: 8851 - power draw [ In reply to ]
On a quick test our 8851 draws 15.4 on boot and settles back to 9.8 at rest.



Terry



From: cisco-voip <cisco-voip-bounces@puck.nether.net> On Behalf Of Lelio Fulgenzi
Sent: Friday, February 7, 2020 7:47 AM
To: Biffle, Gerrad <Gerrad.Biffle@greensboro-nc.gov>
Cc: Cisco-VOIP <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 <Gerrad.Biffle@greensboro-nc.gov <mailto:Gerrad.Biffle@greensboro-nc.gov> >
Sent: Friday, February 7, 2020 9:44 AM
To: Lelio Fulgenzi <lelio@uoguelph.ca <mailto:lelio@uoguelph.ca> >
Cc: Cisco-VOIP <cisco-voip@puck.nether.net <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 Oper Power(Watts) Device Class

From PS To Device

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



Gi2/17 auto on 14.5 13.8 IP Phone 8851 3

Gi2/18 auto on 9.4 8.9 IP Phone 8851 4

Gi2/19 auto on 12.9 12.3 IP Phone 8851 4

Gi2/20 auto on 9.4 8.9 IP Phone 8851 4

Gi2/21 auto off 0.0 0.0 n/a n/a

Gi2/22 auto off 0.0 0.0 n/a n/a

Gi2/23 auto on 9.4 8.9 IP Phone 8851 4

Gi2/24 auto on 10.3 9.8 IP Phone 8851 3

Gi2/25 auto on 10.3 9.8 IP Phone 8851 3

Gi2/26 auto on 9.4 8.9 IP Phone 8851 4

Gi2/27 auto on 6.6 6.3 IP Phone 7962 2

Gi2/28 auto on 9.4 8.9 IP Phone 8851 4

Gi2/29 auto on 10.3 9.8 IP Phone 8851 3





On Feb 6, 2020, at 6:11 PM, Lelio Fulgenzi <lelio@uoguelph.ca <mailto:lelio@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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Please note that email sent to and from this address is subject
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Re: 8851 - power draw [ In reply to ]
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 AKEM No
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 <cisco-voip-bounces@puck.nether.net> On Behalf Of Terry Oakley
Sent: Friday, February 7, 2020 10:39 AM
To: Lelio Fulgenzi <lelio@uoguelph.ca>; Biffle, Gerrad <Gerrad.Biffle@greensboro-nc.gov>
Cc: Cisco-VOIP <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 <cisco-voip-bounces@puck.nether.net<mailto:cisco-voip-bounces@puck.nether.net>> On Behalf Of Lelio Fulgenzi
Sent: Friday, February 7, 2020 7:47 AM
To: Biffle, Gerrad <Gerrad.Biffle@greensboro-nc.gov<mailto:Gerrad.Biffle@greensboro-nc.gov>>
Cc: Cisco-VOIP <cisco-voip@puck.nether.net<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 <Gerrad.Biffle@greensboro-nc.gov<mailto:Gerrad.Biffle@greensboro-nc.gov>>
Sent: Friday, February 7, 2020 9:44 AM
To: Lelio Fulgenzi <lelio@uoguelph.ca<mailto:lelio@uoguelph.ca>>
Cc: Cisco-VOIP <cisco-voip@puck.nether.net<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 Oper Power(Watts) Device Class
From PS To Device
--------- ------ ---------- ---------- ---------- ------------------- -----

Gi2/17 auto on 14.5 13.8 IP Phone 8851 3
Gi2/18 auto on 9.4 8.9 IP Phone 8851 4
Gi2/19 auto on 12.9 12.3 IP Phone 8851 4
Gi2/20 auto on 9.4 8.9 IP Phone 8851 4
Gi2/21 auto off 0.0 0.0 n/a n/a
Gi2/22 auto off 0.0 0.0 n/a n/a
Gi2/23 auto on 9.4 8.9 IP Phone 8851 4
Gi2/24 auto on 10.3 9.8 IP Phone 8851 3
Gi2/25 auto on 10.3 9.8 IP Phone 8851 3
Gi2/26 auto on 9.4 8.9 IP Phone 8851 4
Gi2/27 auto on 6.6 6.3 IP Phone 7962 2
Gi2/28 auto on 9.4 8.9 IP Phone 8851 4
Gi2/29 auto on 10.3 9.8 IP Phone 8851 3


On Feb 6, 2020, at 6:11 PM, Lelio Fulgenzi <lelio@uoguelph.ca<mailto:lelio@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: 8851 - power draw [ In reply to ]
This is incredible! Thanks everyone!

From: Pawlowski, Adam <ajp26@buffalo.edu>
Sent: Friday, February 7, 2020 11:08 AM
To: 'Terry Oakley' <Terry.Oakley@rdc.ab.ca>; Lelio Fulgenzi <lelio@uoguelph.ca>; Biffle, Gerrad <Gerrad.Biffle@greensboro-nc.gov>
Cc: Cisco-VOIP <cisco-voip@puck.nether.net>
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 AKEM No
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 <cisco-voip-bounces@puck.nether.net<mailto:cisco-voip-bounces@puck.nether.net>> On Behalf Of Terry Oakley
Sent: Friday, February 7, 2020 10:39 AM
To: Lelio Fulgenzi <lelio@uoguelph.ca<mailto:lelio@uoguelph.ca>>; Biffle, Gerrad <Gerrad.Biffle@greensboro-nc.gov<mailto:Gerrad.Biffle@greensboro-nc.gov>>
Cc: Cisco-VOIP <cisco-voip@puck.nether.net<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 <cisco-voip-bounces@puck.nether.net<mailto:cisco-voip-bounces@puck.nether.net>> On Behalf Of Lelio Fulgenzi
Sent: Friday, February 7, 2020 7:47 AM
To: Biffle, Gerrad <Gerrad.Biffle@greensboro-nc.gov<mailto:Gerrad.Biffle@greensboro-nc.gov>>
Cc: Cisco-VOIP <cisco-voip@puck.nether.net<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 <Gerrad.Biffle@greensboro-nc.gov<mailto:Gerrad.Biffle@greensboro-nc.gov>>
Sent: Friday, February 7, 2020 9:44 AM
To: Lelio Fulgenzi <lelio@uoguelph.ca<mailto:lelio@uoguelph.ca>>
Cc: Cisco-VOIP <cisco-voip@puck.nether.net<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 Oper Power(Watts) Device Class
From PS To Device
--------- ------ ---------- ---------- ---------- ------------------- -----

Gi2/17 auto on 14.5 13.8 IP Phone 8851 3
Gi2/18 auto on 9.4 8.9 IP Phone 8851 4
Gi2/19 auto on 12.9 12.3 IP Phone 8851 4
Gi2/20 auto on 9.4 8.9 IP Phone 8851 4
Gi2/21 auto off 0.0 0.0 n/a n/a
Gi2/22 auto off 0.0 0.0 n/a n/a
Gi2/23 auto on 9.4 8.9 IP Phone 8851 4
Gi2/24 auto on 10.3 9.8 IP Phone 8851 3
Gi2/25 auto on 10.3 9.8 IP Phone 8851 3
Gi2/26 auto on 9.4 8.9 IP Phone 8851 4
Gi2/27 auto on 6.6 6.3 IP Phone 7962 2
Gi2/28 auto on 9.4 8.9 IP Phone 8851 4
Gi2/29 auto on 10.3 9.8 IP Phone 8851 3


On Feb 6, 2020, at 6:11 PM, Lelio Fulgenzi <lelio@uoguelph.ca<mailto:lelio@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: 8851 - power draw [ In reply to ]
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@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) <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
Re: 8851 - power draw [ In reply to ]
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) <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 <cisco-voip-bounces@puck.nether.net<mailto:cisco-voip-bounces@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>) <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