Cisco 6851 Installation Guide

Installation Guide for Cisco IP Phone with Multiplatform Firmware
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Physical and Operating Environment Specifications
Technical Details
Specification Value and Range
Power for Cisco IP Phones
• When using the AC adapter:
◦ 6800 series: 100-240 VAC, 50-60 Hz, 0.4 A
◦ 7800 series: 100-240 VAC, 50-60 Hz, 0.5 A
◦ 8800 series: 100-240 VAC, 50-60 Hz, 0.5 A
• When using the in-line PoE cable: 48 VDC, 0.2 A (6821, 6851, 7800 series and 8800
series)
Power for Cisco IP
Conference Phones
• 7832
◦ IEEE PoE Class 2. The phone is compatible with both IEEE 802.3af and 802.3at
switch blades and supports both Cisco Discovery Protocol and Link Layer
Discovery Protocol - Power over Ethernet (LLDP-PoE)
◦ If the connected LAN switches don’t support PoE, an additional PoE power injector
will be needed to convert AC wall power to provide PoE
• 8832
◦ IEEE PoE Class 3 via a PoE injector. The phone is compatible with both IEEE
802.3af and 802.3at switch blades and supports both Cisco Discovery Protocol and
Link Layer Discovery Protocol - Power over Ethernet (LLDP-PoE).
◦ Other options include a non-PoE Ethernet injector if the connected LAN switches
don’t support PoE. For Wi-Fi deployment, a Cisco IP Conference Phone 8832
Power Adapter is needed.
Supported Ethernet Cables
• 6800 series
◦ Category 3/5/5e/6 for 10-Mbps cables with 4 pairs
◦ Category 5/5e/6 for 100-Mbps cables with 4 pairs
◦ Category 5/5e/6 for 1000-Mbps cables with 4 pairs (not for 6821 and 6861)
• 7800 series
◦ Category 3/5/5e/6 for 10-Mbps cables with 4 pairs
◦ Category 5/5e/6 for 100-Mbps cables with 4 pairs
◦ Category 5/5e/6 for 1000-Mbps cables with 4 pairs (for 7841 only)
• 8800 series
◦ Category 3/5/5e/6 for 10-Mbps cables with 4 pairs
◦ Category 5/5e/6 for 100-Mbps cables with 4 pairs
◦ Category 5e/6 for 1000-Mbps cables with 4 pairs
• 7832
◦ Category 3/5/5e/6 for 10-Mpbs cables with 4 pairs
◦ Category 5/5e/6 for 100-Mbps cables with 4 pairs
• 8832: USB-C cable
Note: Cables have 4 pairs of wires for a total of 8 conductors
Distance requirements As supported by the Ethernet Specication, the maximum cable length between
each Cisco IP Phone and the switch is assumed to be 330 feet (100 meters).

Cisco 6851 Specifications

General

Brand	Cisco
Model	6851
Category	IP Phone
Language	English