8851 KEM not powering from Z3

[ExuroFire]

I use an 8851 with one KEM at my work office normally. Have been remote at my home office which is using a Meraki Z3 provided for work network access. Phone works fine when connected to PoE port however the KEM does not. Any thoughts or suggestions to get the KEM working would be appreciated.

[Jaime Valencia]

I'd start by looking at what kind of PoE the Meraki device provides, and if it's capable of providing enough power for the phone + sidecar, if not, you'd need a power cube. 

[Ritesh Desai]

@ExuroFire adding to what @Jaime Valencia  said. Please refer to Table 4. Power-Supply Compatibility Table details Link is here 
Check which port of Meraki Z3 is capable of, it should be 802.3af or 802.3at for supplying power to KEM console.

thanks and regards,

Ritesh Desai

Please rate helpful posts.

[ExuroFire]

Did that:

Configuration	802.3af Power over Ethernet (PoE)	802.3at PoE	Cisco IP Phone Power Cube 4
8851 + KEM x 1	Yes	Yes	Yes

Verified 1 x PoE enabled port (802.3af, 15.5W on the Meraki Z3; even had them push a firmware upgrade. Powered off and back on and same thing. Phone powers up and after a minute says ""Accessory Added - phone cannot power accessory"

Unless I am reading something wrong it should work. Setup works on office LAN/WAN fine, just not at remote location on Meraki Z3

[Ritesh Desai]

@ExuroFire 

If i correctly understood, the "SAME" Cisco IP Phone + KEM Console * 1 works fine on Office LAN connected to Cisco PoE switch BUT when connected to remote site having Meraki Z3 PoE switch it does not work? If yes, then I would say to

- replace with Cisco switch if you have many IP Phones with KEM consoles.

- manage to have speed-dials on 8800 phones.

You can also perform working and non-working scenario for same phone with same KEM console if you haven't tried.

regards,

Ritesh Desai

Please rate helpfull post.

[ExuroFire]

I am not sure if I completely follow your suggestion. The phone and KEM work fine at the work building on the company LAN. However it doesnt on the Z3. The Z3 is used at a remote location for one computer and the phone / KEM. I have checked all the specifications, just like we did before purchasing and it is supposed to work. Cisco / Meraki have provided no help. All settings on the Z3 are correct as per documentation.

[Ritesh Desai]

Hi,

I just checked in Z3 datasheet here and it mentions 802.3af so it should work. The KEM supports 802.3af as specified in datasheet here 

Not exact but similar case found meraki support forum I guess Meraki is new product launched and may be not supporting KEM console.

The reason to ask is to identify if the KEM console is working / non-working condition. Are you sure about that?

regards,

Ritesh Desai

Please rate helpful post.

[loganoncucm]

For anyone else experiencing this issue and happen to come across this problem. the solution is quite simple.

On the Device configuration page in CUCM for the 8851 phone, scroll down to Product Specific Configuration Layout. Find "Power Negotiation" and change to Disabled. Save and Apply. client may need to power cycle their phone. 

Power negotiation must not be supported by the Meraki z3. Disabling this on the phone will allow the phone to draw as much power as it needs to power the accessories.