Key Expansion Module Power Information - Cisco 8800 Series Administration Manual

Hardware and Accessory Installation
Table 17: Cisco IP Phones and Supported Cisco IP Phone 8851/8861 Key Expansion Module and Cisco IP Phone 8865 Key Expansion Module
Cisco IP Phone Model
Cisco IP Phone 8851
Cisco IP Phone 8861
Cisco IP Phone 8865

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 18: 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
802.3af Power over Ethernet
(PoE)
Yes
No
No
No
No
Cisco IP Phone 8800 Series Multiplatform Phones Administration Guide
Key Expansion Module Power Information
Supported Numbers of Key Expansion Modules and Buttons
2; dual LCD screen, 14 line keys, two pages, providing 56 buttons
3; dual LCD screen, 14 line keys, two pages, providing 84 buttons
3; dual LCD screen, 14 line keys, two pages, providing 84 buttons
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 Power Cube 4
Yes
Yes
Yes
Yes
Yes
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