[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 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 at puck.nether.net> On Behalf Of Terry Oakley
Sent: Friday, February 7, 2020 10:39 AM
To: Lelio Fulgenzi <lelio at uoguelph.ca>; Biffle, Gerrad <Gerrad.Biffle at greensboro-nc.gov>
Cc: Cisco-VOIP <cisco-voip at 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 at puck.nether.net<mailto:cisco-voip-bounces at puck.nether.net>> On Behalf Of Lelio Fulgenzi
Sent: Friday, February 7, 2020 7:47 AM
To: Biffle, Gerrad <Gerrad.Biffle at greensboro-nc.gov<mailto:Gerrad.Biffle at greensboro-nc.gov>>
Cc: Cisco-VOIP <cisco-voip at puck.nether.net<mailto:cisco-voip at 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 at greensboro-nc.gov<mailto:Gerrad.Biffle at greensboro-nc.gov>>
Sent: Friday, February 7, 2020 9:44 AM
To: Lelio Fulgenzi <lelio at uoguelph.ca<mailto:lelio at uoguelph.ca>>
Cc: Cisco-VOIP <cisco-voip at puck.nether.net<mailto:cisco-voip at 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 at uoguelph.ca<mailto:lelio at 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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