Cisco Ip Phone 8800 Series Administration Guide For Cisco Unified Communications Manager - Cisco 8800 Series Administration Manual

Key Expansion Module Power Information
Table 16: Cisco IP Phones and Supported Key Expansion Modules
Cisco IP Phone Model
Cisco IP Phone 8851 and 8851NR
Cisco IP Phone 8861
Cisco IP Phone 8865 and 8865NR
Related Topics
Wall Mounts, on page 109
Accessory Support, on page 83
Key Expansion Module Power Information
The Cisco IP Phone 8800 Key Expansion Module increases the amount of power that the phone consumes.
Although Power over Ethernet (PoE) from the switch may provide enough power to meet the needs of a phone
that has multiple key expansion modules attached, use of a power cube may be necessary. The tables that
follow help you understand whether your PoE equipment can provide the necessary power.
The Cisco IP Phone 8800 Key Expansion Module power consumption and power scheme is:
Power Consumption
Power Scheme
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
Note When you attach more than one key expansion module to the Cisco IP Phone 8861, 8865, and 8865NR,
the fast-charge feature that uses the back USB port is not supported. In this scenario, the back port will
slow-charge the device.
Table 17: Cisco IP Phone 8800 Series - Power Summary
SmartPhone Charging

Cisco IP Phone 8800 Series Administration Guide for Cisco Unified Communications Manager

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48V DC, 5W per key expansion module
The phone can power one key expansion module directly. For more information, see the following
tables.
Supported Key Expansion Modules
2; providing 72 lines or buttons
3; providing 108 lines or buttons
3; providing 108 lines or buttons
Cisco IP Phone 8851 and 8851NR
Yes (802.3af)
Cisco IP Phone 8861, 8865, and
8865NR
Yes (802.3af)