Cisco 7821 Administration Guide

The Cisco IP Phone 7811 does not contain a headset jack.
Note
• RJ-45 jack for the LAN 10/100BaseT connection (on Cisco IP Phones 7811, 7821, and 7861) and the
LAN 1000BaseT connection (on the Cisco IP Phone 7841).
• RJ-45 jack for a second 10/100BaseT compliant connection (on Cisco IP Phones 7811, 7821, and 7861)
and the LAN 1000BaseT connection (on the Cisco IP Phone 7841).
• 48-volt power connector.
Network and Computer Port Pinouts
Although both the network and computer (access) ports are used for network connectivity, they serve different
purposes and have different port pinouts:
• The network port is the 10/100 SW port; the Cisco IP Phone 7841 has a 10/100/1000 SW network port.
• The computer (access) port is the 10/100 PC port; the Cisco IP Phone 7841 has a 10/100/1000 PC
computer port.
Network Port Connector
The following table describes the network port connector pinouts.
Table 2: Network Port Connector Pinouts
FunctionPin Number
BI_DA+1
BI_DA-2
BI_DB+3
BI_DC+4
BI_DC-5
BI_DB-6
BI_DD+7
BI_DD-8
BI stands for bidirectional, while DA, DB, DC, and DD stand for Data A, Data B, Data C, and
Data D respectively.
Note
Cisco IP Phone 7800 Series Multiplatform Phones Administration Guide
13
About the Cisco IP Phone
Network and Computer Port Pinouts

Cisco 7821 Specifications

General

Brand	Cisco
Model	7821
Category	IP Phone
Language	English