Table 7: Power-Supply Compatibility for Cisco IP Phone 8851/8861 Key Expansion Module and Cisco IP Phone 8865 Key Expansion Module
Cisco IP Phone Power Cube 4802.3at PoE802.3af Power over Ethernet
(PoE)
Configuration
YesYesYes8851 with 1 key expansion
module
YesYes
See the third note below
No8851with 2 key expansion
modules
YesYesNo8861 and 8865 with 1 key
expansion module
YesYes
See the first note below
No8861 and 8865 with 2 key
expansion modules
YesYes
See the first note below
No8861 and 8865 with 3 key
expansion modules
• The fast-charging feature on the back USB does not work when more than one key expansion module
is attached to a Cisco IP Phone 8861 and 8865 using 802.3at PoE.
• The fast-charging feature on the back USB doesn’t work when more than one key expansion module is
attached to a Cisco IP Phone 8861 and 8865, unless Cisco Universal PoE (UPoE) is used.
• Cisco IP Phone 8851 with 2 key expansion modules works on 802.3at PoE only with v08 or later hardware.
You can find the phone version information on the lower back of the phone as part of the TAN and PID
label. Version information is also located on the individual phone packaging.
Note
Connect a Key Expansion Module to a Cisco IP Phone
If you want to install more than one key expansion module, you repeat steps 7-9 to connect the other key
expansion modules together.
Procedure
Step 1 Unplug the Ethernet cable from the phone.
Step 2 If installed, remove the footstand from the phone.
Step 3 Locate the accessory connector covers on the side of the phone.
This diagram shows the location.
Cisco IP Phone Accessories
16
Cisco IP Phone Accessories
Connect a Key Expansion Module to a Cisco IP Phone
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