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knolan103
knolan103
New Member
November 2, 2021
Question

FortiSwitch and Cisco Phone Expansion Module

  • November 2, 2021
  • 3 replies
  • 3350 views

I have a Cisco 8851 phone with an expansion module on it.  The phone powers up and registers correctly, but  I cannot get the expansion module to power up over POE.

 

 

MDF-RB-SW1 # diagnose switch poe status port25

 

Port(25) Power:2.70W,   Power-Status: Delivering Power

Power-Up Mode: Normal Mode

Remote Power Device Type: IEEE802.3AT PD

Power Class: 4

Defined Max Power: 32.0W, Priority: Low.

Voltage: 53.75V

Current: 51mA

Temperature: 26.25 Centigrade

 

3 replies

GDiFi
Staff
GDiFi
Staff
November 22, 2021

What model FortiSwitch are you using.  It appears the module just pulls the power from the phone which is getting PoE and negotiating its requires with the fortiswitch.  With the 8851 you should be able to power 1 expansion module on 802.3af or 802.3at power.

gapierce
gapierce
New Member
January 3, 2022

Just curious if you resolved this problem?  We are having the same issue on a 148 Full POE.

MichelleL
MichelleL
New Member
June 26, 2023

We had an issue with 1 expansion module so far out of 2.  The issue was resolved by upgrading the expansion module and configuration changes in the cucm. 

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