Cisco 8851, Administration Manual

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Supported Key Expansion Modules Cisco IP Phone Model
3; providing 108 lines or buttons Cisco IP Phone 8861
Key Expansion Module Power Information
If you use a key expansion module with your phone then Power over Ethernet (PoE) is enough to power your
expansion modules. But a power cube is needed for smartphone or tablet charging when your 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 15: Power-Supply Compatibility Table
Cisco IP Phone Power Cube 4 802.3at PoE 802.3af Power over Ethernet
(PoE) Configuration
Yes Yes Yes 8851 with 1 expansion module
Yes No
See the third note above
No 8851with 2 expansion modules
Yes Yes No 8861 with 1 expansion module
Yes Yes
See the first note above
No 8861 with 2 expansion modules
Yes Yes
See the first note above
No 8861 with 3 expansion modules
Note
• The fast-charging feature on the back USB does not work when more than one 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 expansion module is
attached to a Cisco IP Phone 8861 unless Cisco Universal PoE (UPoE) is used.
• Cisco IP Phone 8851 with 2 expansion modules will work 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.
Cisco IP Phone 8800 Series Multiplatform Phones Administration Guide
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Key Expansion Module Power Information