Cisco Cisco IP Phone 8841 Design Guide
Cisco Wireless IP Phone 8821 and 8821-EX Wireless LAN Deployment Guide
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Contents
Cisco Wireless IP Phone 8821 and 8821-EX Overview ......................................................................................................................... 6
Phone Models ......................................................................................................................................................................................... 6
Requirements .......................................................................................................................................................................................... 6
Site Survey .......................................................................................................................................................................................... 7
Call Control ........................................................................................................................................................................................ 8
Wireless LAN ..................................................................................................................................................................................... 8
Protocols ............................................................................................................................................................................................... 12
Wi-Fi ..................................................................................................................................................................................................... 12
Regulatory ........................................................................................................................................................................................ 15
Bluetooth ............................................................................................................................................................................................... 16
Languages ............................................................................................................................................................................................. 17
8821-EX Certifications ......................................................................................................................................................................... 17
Battery Life ........................................................................................................................................................................................... 18
Phone Care ........................................................................................................................................................................................... 20
Accessories ........................................................................................................................................................................................... 20
Wireless LAN Design .............................................................................................................................................................................. 21
802.11 Network ..................................................................................................................................................................................... 22
5 GHz (802.11a/n/ac) ....................................................................................................................................................................... 22
2.4 GHz (802.11b/g/n) ...................................................................................................................................................................... 23
Signal Strength and Coverage .......................................................................................................................................................... 24
Data Rates ......................................................................................................................................................................................... 27
Rugged Environments ...................................................................................................................................................................... 28
Security ................................................................................................................................................................................................. 30
Extensible Authentication Protocol - Flexible Authentication via Secure Tunneling (EAP-FAST) ............................................... 31
Extensible Authentication Protocol - Transport Layer Security (EAP-TLS) ................................................................................... 32
Protected Extensible Authentication Protocol (PEAP) .................................................................................................................... 34
EAP and User Database Compatibility ............................................................................................................................................ 34
Quality of Service (QoS) ....................................................................................................................................................................... 35
Call Admission Control (CAC) ........................................................................................................................................................ 35
Traffic Classification (TCLAS) ........................................................................................................................................................ 36
QoS Basic Service Set (QBSS) ........................................................................................................................................................ 36
Wired QoS ........................................................................................................................................................................................ 37
Roaming ................................................................................................................................................................................................ 38
Fast Secure Roaming (FSR) ............................................................................................................................................................. 38
Interband Roaming ........................................................................................................................................................................... 39
Scanning ........................................................................................................................................................................................... 40
Power Management .............................................................................................................................................................................. 40
Call Capacity ........................................................................................................................................................................................ 41
Multicast ............................................................................................................................................................................................... 41
Configuring the Cisco Wireless LAN .................................................................................................................................................... 42
Cisco Wireless LAN Controller and Lightweight Access Points .......................................................................................................... 42
802.11 Network Settings .................................................................................................................................................................. 43
WLAN Settings ................................................................................................................................................................................ 53
Controller Settings ............................................................................................................................................................................ 58
Call Admission Control (CAC) ........................................................................................................................................................ 60