Cisco 7821 Administration Guide

Computer Port Connector
The following table describes the computer port connector pinouts.
Table 3: Computer (Access) Port Connector Pinouts
FunctionPin Number
BI_DB+1
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.
When you install a phone that is powered with external power, connect the power supply to the phone and to
a power outlet 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.
Note
Table 4: Guidelines for Cisco IP Phone Power
GuidelinesPower Type
The Cisco IP Phone uses the CP-PWR-CUBE-3 power
supply.
External power: Provided through the
CP-PWR-CUBE-3= external power supply
Cisco IP Phone 7800 Series Multiplatform Phones Administration Guide
14
About the Cisco IP Phone
Computer Port Connector

Cisco 7821 Specifications

General

Brand	Cisco
Model	7821
Category	IP Phone
Language	English