Cisco 7920 Administration Guide - Page 35

CH A P T E R 2 An Overview of the Wireless Network With the introduction of wireless communication, mobile wireless IP phones can provide voice communication within the corporate wireless local area network (WLAN). The Cisco Wireless IP Phone 7920 depends upon and interacts with wireless access points and key Cisco IP telephony components, including Cisco CallManager, to provide wireless voice communication. This chapter provides you with an overview of the interaction between the Cisco Wireless IP Phone 7920 and other key components of the Voice-over-IP (VoIP) network in the WLAN environment. • Understanding the Wireless LAN, page 2-1 • Components of the VoIP Wireless Network, page 2-5 • Wireless Network and Access Point Configuration, page 2-19 • Understanding the Phone Startup Process, page 2-21 Understanding the Wireless LAN This section includes the following topics about WLANs. • The 802.11 Standards for Wireless LAN Communications, page 2-2 • Connecting to the Wireless Network, page 2-3 • Securing Voice Communications, page 2-4 In a traditional LAN, phones and computers use cables to transmit messages and data packets over a wire conductor. Wireless LANs use radio waves to carry the messages and data packets. Cisco Wireless IP Phone 7920 Administration Guide for Cisco CallManager Release 4.0 and 4.1 OL-7104-01 2-1