Cisco 7921G Administration Guide - Page 33

Chapter 2 Overview of the VoIP Wireless Network Understanding WLAN Standards and Technologies Note In a non controller-based wireless network, it is recommended that you statically configure channels for each AP. If your wireless network uses a controller, use the Auto-RF feature with minimal voice disruption. Table 2-2 Regulatory Domain Frequency Band and Channel Usage Regulatory Domain FCC Product number: CP-7921G-A ETSI (Europe) Product number: CP-7921G-E Japan Product number: CP-7921G-P World Product number: CP-7921G-W Frequency Band Range 2.412-2.462 GHz 5.15-5.25 GHz (UNII-1) 5.25-5.35 GHz (UNII-2) 5.725-5.825 (UNII-3) 5.470 - 5.725 (DFS) 5.47-5.725 GHz (pending approval 2.412-2.472 GHz 5.15-5.725 GHz 2.412-2.472 GHz 2.412-2.484 GHz 5.15-5.35 GHz Uses 802.11d to identify band ranges Operating Channels 11 channels 12 channels 11 channels 13 channels (1-13) 19 channels 13 channels (ODFM) 14 channels (CCK) 8 channels Uses 802.11d to identify channels The AP coverage area depends on its type of antenna and transmission power. The AP coverage range is from 500 to 1000 feet with effective isotropic radiated power (EIRP) output that scales at 1, 5, 20, and 50 mW. To provide effective coverage, APs need a range overlap of approximately 20 percent to allow uninterrupted connections as phone users roam from one AP to another. Wireless networks use a service set identifier (SSID). The SSID differentiates one WLAN from another, so all APs and all devices attempting to connect to a specific WLAN must use the same SSID. The SSID groups user devices and associates the group with the APs. For more information about wireless network components and design, refer to the following documents: • Cisco Enterprise Distributed Wireless Solution Reference Network Design at http://www.cisco.com/application/pdf/en/us/guest/netsol/ns178/c649/ ccmigration_09186a00800d67eb.pdf • Overview: Cisco Unified Wireless Network at http://www.cisco.com/en/US/solutions/ns175/ networking_solutions_products_genericcontent0900aecd80529a5f.html. For more information about APs, see the "VoIP WLAN Configuration" section on page 2-18. OL-15985-01 Cisco Unified Wireless IP Phone 7921G Administration Guide for Cisco Unified Communications Manager Release 7.0 2-5