Cisco 7920 - Unified Wireless IP Phone VoIP, Руководство администратора

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Chapter 2 An Overview of the Wireless Network
Components of the VoIP Wireless Network
2-8
Cisco Wireless IP Phone 7920 Administration Guide for Cisco CallManager Release 4.0 and 4.1
OL-7104-01
Related Topics
•
Understanding the Phone Startup Process, page 2-21
•
Components of the VoIP Wireless Network, page 2-5
•
Modifying DHCP Settings, page 5-4
•
Configuring TFTP Option, page 5-9
Interacting with the Cisco Aironet Access Point
Wireless voice devices use the same access points as wireless data devices.
However, voice traffic over a WLAN requires different equipment configurations
and layouts than a WLAN that is used exclusively for data traffic. Data
transmission can tolerate a higher level of RF noise, packet loss, and channel
contention than voice transmission. Packet loss while searching a web page might
Wi-Fi (802.11b) An open standard that defines
wireless methods of transmitting
Ethernet traffic and is commonly
called Wi-Fi. This standard defines
radio frequencies (RF) and data
speed for wireless LAN
communications. Cisco Wireless IP Phone 7920 uses
the 802.11b standard with a range of
2.4-2.497 GHz RF and dynamic data
rate scaling of 1, 2, 5.5, and 11 Mbps.
Wired Equivalent
Privacy (WEP) Wireless security protocol for
encrypting data that uses an
encryption key stored on the phone
and access point. Cisco Wireless IP Phone 7920 can
use either static WEP or dynamic
WEP keys for encryption, depending
on the network security
configuration.
Wireless Protected
Access (WPA) Provides stronger authentication,
encryption key management and
alternative encryption and message
integrity methods. Cisco Wireless IP Phone 7920
supports both WPA and WPA
Pre-shared key authentication,
including encryption using TKIP and
MIC (message integrity check)
Table 2-1 Supported Networking Protocols on the Cisco Wireless IP Phone 7920 (continued)
Networking Protocol Purpose Usage Notes