Cisco 7821 Administration Guide

Value or RangeSpecification
14° to 140°F (–10° to 60°C)Storage temperature
8.14 in. (207 mm)Height
• Cisco IP Phone 7811— 7.67 in. (195 mm)
• Cisco IP Phone 7821 — 8.11 in. (206 mm)
• Cisco IP Phone 7841 — 8.11 in. (206 mm)
• Cisco IP Phone 7861— 10.42 in. (264.91 mm)
Width
1.1 in. (28 mm)Depth
• Cisco IP Phone 7811— 0.84 kg
• Cisco IP Phone 7821 — 0.867 kg
• Cisco IP Phone 7841 — 0.868 kg
• Cisco IP Phone 7861— 1.053 kg
Weight
• 100-240 VAC, 50-60 Hz, 0.5 A—When using
the AC adapter
• 48 VDC, 0.2 A—When using the in-line power
over the network cable
Power
Cisco IP Phone 7811, 7821, 7841, and 7861:
• Category 3/5/5e/6 for 10-Mbps cables with 4
pairs
• Category 5/5e/6 for 100-Mbps cables with 4 pairs
Cisco IP Phone 7841: Category 5/5e/6 for 1000-Mbps
cables with 4 pairs
Cables have 4 pairs of wires for a total of
8 conductors.
Note
Cables
As supported by the Ethernet Specification, it is
assumed that the maximum cable length between each
Cisco IP Phone and the switch is 100 meters
(330 feet).
Distance Requirements
For more information, see the Cisco IP Phone 7800 Series Data Sheet: https://www.cisco.com/c/en/us/products/
collaboration-endpoints/ip-phone-7800-series-multiplatform-firmware/datasheet-listing.html
Cable Specifications
• RJ-9 jack (4-conductor) for handset and headset connection.
Cisco IP Phone 7800 Series Multiplatform Phones Administration Guide
12
About the Cisco IP Phone
Cable Specifications

Cisco 7821 Specifications

General

Brand	Cisco
Model	7821
Category	IP Phone
Language	English