Cisco 6821

Installation Guide for Cisco IP Phone with Multiplatform Firmware
31
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).