Cisco 8851 Administration Guide

Table 17: Cisco IP Phones and Supported Cisco IP Phone 8851/8861 Key Expansion Module and Cisco IP Phone 8865 Key Expansion Module
Supported Numbers of Key Expansion Modules and ButtonsCisco IP Phone Model
2; dual LCD screen, 14 line keys, two pages, providing 56 buttonsCisco IP Phone 8851
3; dual LCD screen, 14 line keys, two pages, providing 84 buttonsCisco IP Phone 8861
3; dual LCD screen, 14 line keys, two pages, providing 84 buttonsCisco 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
Cisco IP Phone Power Cube 4802.3at PoE802.3af Power over Ethernet
(PoE)
Configuration
YesYesYes8851 with 1 key expansion
module
YesNo
See the third note below
No8851with 2 key expansion
modules
YesYesNo8861 with 1 key expansion
module
YesYes
See the first note below
No8861 with 2 key expansion
modules
YesYes
See the first note below
No8861 with 3 key expansion
modules
Cisco IP Phone 8800 Series Multiplatform Phones Administration Guide
109
Hardware and Accessory Installation
Key Expansion Module Power Information

Cisco 8851 Specifications

General

Brand	Cisco
Model	8851
Category	IP Phone
Language	English