Cisco 8800 Series Manual page 15

Cisco IP Phone Accessories
Key Expansion Module Power Information
If you use a key expansion module with your IP phone, then Power over Ethernet (PoE) is enough to power
your expansion modules. But, your phone must have an IP address in order to charge the expansion module.
A power cube is needed for smartphone or tablet charging when your key expansion module is attached.
A key expansion module uses 48V DC, 5W per module. If you are charging a smartphone or a tablet, note
the following:
• Side USB: Up to 500mA/2.5W charging
• Back USB: Fast charging, Supports up to 2.1A/10.5W charging
Table 6: Power-Supply Compatibility for Cisco IP Phone 8800 Key Expansion Module
Configuration
8851 with 1 key expansion
module
8851with 2 key expansion
modules
8861 with 1 key expansion
module
8861 with 2 key expansion
modules
8861 with 3 key expansion
modules
Note
802.3af Power over Ethernet
(PoE)
Yes
No
No
No
No
• 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 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, 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.
Key Expansion Module Power Information
802.3at PoE
Yes
No
See the third note below
Yes
Yes
See the first note below
Yes
See the first note below
Cisco IP Phone Accessories
Cisco IP Phone Power Cube 4
Yes
Yes
Yes
Yes
Yes
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