Design Guide

Cisco Wireless IP Phone 8821 and 8821-EX Wireless LAN Deployment Guide
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Use of Orthogonal Frequency Division Multiplexing (OFDM), which is used by 802.11a/n/ac and 802.11g/n, can help to reduce
issues seen in high multipath environments.
If using 802.11b in a high multipath environment, lower data rates should be used in those areas (e.g. 1 and 2 Mbps).
Use of antenna diversity can also help in such environments.
Security
When deploying a wireless LAN, security is essential.
The Cisco Wireless IP Phone 8821 and 8821-EX support the following wireless security features.
WLAN Authentication
• WPA2 (802.1x authentication + AES or TKIP encryption)
• WPA (802.1x authentication + TKIP or AES encryption)
• WPA2-PSK (Pre-Shared key + AES encryption)
• WPA-PSK (Pre-Shared key + TKIP encryption)
• EAP-FAST (Extensible Authentication Protocol - Flexible Authentication via Secure Tunneling)
• EAP-TLS (Extensible Authentication Protocol - Transport Layer Security)
• PEAP-GTC (Protected Extensible Authentication Protocol - Generic Token Card)
• PEAP-MSCHAPv2 (Protected Extensible Authentication Protocol - Microsoft Challenge Handshake Authentication
Protocol version 2)
• 802.11r / Fast Transition (FT)
• CCKM (Cisco Centralized Key Management)
• None
WLAN Encryption
• AES (Advanced Encryption Standard)
• TKIP / MIC (Temporal Key Integrity Protocol / Message Integrity Check)
• WEP (Wired Equivalent Protocol) 40/64 and 104/128 bit