Cisco 8851, Administration Manual

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Function Pin Number
BI_DB- 2
BI_DA+ 3
BI_DD+ 4
BI_DD- 5
BI_DA- 6
BI_DC+ 7
BI_DC- 8
BI stands for bidirectional, while DA, DB, DC, and DD stand for Data A, Data B, Data C, and Data
D respectively. Note
Phone Power Requirements
The Cisco IP Phone can be powered with external power or with Power over Ethernet (PoE). A separate power
supply provides external power. The switch can provide PoE through the phone Ethernet cable.
Cisco IP Phones 8861 and 8865 are PoE Class 4 devices and require a switch or line card with Class 4
capabilities to support extra features.
For more information on your phone's power requirements, consult your phone's data sheet.
When you install a phone that is powered with external power, connect the power supply before you connect
the Ethernet cable to the phone. When you remove a phone that is powered with external power, disconnect
the Ethernet cable from the phone before you disconnect the power supply.
Table 4: Guidelines for Cisco IP Phone Power
Guidelines Power type
The Cisco IP Phone uses the CP-PWR-CUBE-4 power supply. External power: Provided
through the
CP-PWR-CUBE-4=
external power supply
Cisco IP Phones 8851, 8861, and 8865 support 802.3at PoE for accessory use.
For more information, consult your phone's data sheet.
The switch requires a backup power supply for uninterruptible operation of
the phone
Make sure that the CatOS or IOS version that runs on your switch supports
your intended phone deployment. See the documentation for your switch for
operating system version information.
PoE power — Provided by a
switch through the Ethernet
cable attached to the phone.
Cisco IP Phone 8800 Series Multiplatform Phones Administration Guide
12
Phone Power Requirements