Cisco 7821 Administration Guide

CHAPTER 2
Technical Details
• Overview of the Cisco IP Phone, on page 11
• Physical and Operating Environment Specifications, on page 11
• Cable Specifications, on page 12
• Network and Computer Port Pinouts, on page 13
• Phone Power Requirements, on page 14
• Network Protocols, on page 16
• VLAN Interaction, on page 19
• External Devices, on page 20
Overview of the Cisco IP Phone
The Cisco IP Phone 7800 Series Multiplatform Phones comprises a set of full-featured VoIP
(Voice-over-Internet Protocol) phones that provide voice communication over an IP network. The phones
provide all the features of traditional business phones, such as call forwarding, redialing, speed dialing,
transferring calls, and conference calling. The Cisco IP Phone 7800 Series Multiplatform Phones is targeted
for solutions that are centered on Third-Party SIP-based IP PBX.
In this document, the terms Cisco IP Phone or phone mean Cisco IP Phone 7800 Series Multiplatform Phones.
Note
Physical and Operating Environment Specifications
The following table shows the physical and operating environment specifications for the Cisco IP Phone 7800
Series with Multiplatform Firmware.
Table 1: Physical and Operating Specifications
Value or RangeSpecification
32° to 104°F (0° to 40°C)Operating temperature
10% to 90% (noncondensing)Operating relative humidity
Cisco IP Phone 7800 Series Multiplatform Phones Administration Guide
11

Cisco 7821 Specifications

General

Brand	Cisco
Model	7821
Category	IP Phone
Language	English