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Connect a Key Expansion Module to a Cisco IP Phone

Table 7: Power-Supply Compatibility for Cisco IP Phone 8851/8861 Key Expansion Module and Cisco IP Phone 8865 Key Expansion Module

Configuration

8851 with 1 key expansion

module

8851with 2 key expansion

modules

8861 and 8865 with 1 key

expansion module

8861 and 8865 with 2 key

expansion modules

8861 and 8865 with 3 key

expansion modules

Note

Connect a Key Expansion Module to a Cisco IP Phone

If you want to install more than one key expansion module, you repeat steps 7-9 to connect the other key

expansion modules together.

Procedure

Step 1

Unplug the Ethernet cable from the phone.

Step 2

If installed, remove the footstand from the phone.

Step 3

Locate the accessory connector covers on the side of the phone.

This diagram shows the location.

Cisco IP Phone Accessories

802.3af Power over Ethernet

(PoE)

Yes

• 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 and 8865 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 and 8865, 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.

802.3at PoE

Yes

See the third note below

Yes

See the first note below

Yes

See the first note below

Cisco IP Phone Accessories

Cisco IP Phone Power Cube 4

Yes