When designing a WLAN network using Cisco 1142 APs to support both voice services (Cisco 7921 IP Phones) and data services, what design principles are true? (Choose 2)
A. 802.11n data rates should be enabled to improve overall performance even if the Cisco 7921 IP Phones do not support 802.11n data rates.
B. 802.11n data rates should not be enabled as the Cisco 7921 IP Phones are not 802.11n capable. As such, no performance improvement is expected for the voice clients upon enabling 802.11n data rates.
C. Ensure proper floor coverage to ensure good voice quality (-67 dBm, 20% cell overlap, and 19 dB channel separation).
D. -67 dBm, 20% cell overlap, and 19 dB channel separation is impossible to achieve. Therefore, a site survey to ensure required RSSI coverage is top priority to ensure good voice quality.
E. RRM should not be used as it is not designed for wireless voice services and will adjust the channel and Tx power settings to non optimized values for voice services.
F. RRM should be used because it is the only way to ensure that channel and Tx power are configured to support voice services.
