Cisco 6851 Administration Guide

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 following table describes the ways to provide power to the phones.
Separate External PowerPoE Through EthernetPhone
SupportedSupportedCisco IP Phone 6821 Multiplatform
Phones
SupportedNot supportedCisco IP Phone 6841 Multiplatform
Phones
SupportedSupportedCisco IP Phone 6851 Multiplatform
Phones
SupportedNot supportedCisco IP Phone 6861 Multiplatform
Phones
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
Cisco IP Phone 6800 Series Multiplatform Phones Administration Guide
14
About the Cisco IP Phone
Phone Power Requirements

Cisco 6851 Specifications

General

Network Protocols	SIP
Speakerphone	Yes
Bluetooth	No
Wi-Fi	No
USB Port	No
Display	3.5 inch grayscale display (396 x 162 pixels)
Ethernet	10/100 Ethernet
PoE	IEEE 802.3af
Audio	Wideband audio
Line Keys	4
Headset Port	RJ9
Supported Codecs	G.711, G.722, G.729, iLBC
Weight	0.9 kg