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)
Click on the arrows to vote for the correct answer
A. B. C. D. E. F.AC.
When designing a WLAN network to support both voice services and data services using Cisco 1142 APs, the following design principles are true:
C. Ensure proper floor coverage to ensure good voice quality (-67 dBm, 20% cell overlap, and 19 dB channel separation).
Proper floor coverage is essential for providing good voice quality in a WLAN network. The recommended signal strength for voice services is -67 dBm, which ensures adequate signal strength for voice clients to maintain a good connection. Additionally, 20% cell overlap ensures that there is sufficient coverage throughout the entire WLAN network, while 19 dB channel separation helps to reduce interference between channels.
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.
Achieving -67 dBm signal strength, 20% cell overlap, and 19 dB channel separation can be challenging in real-world WLAN environments. A site survey is a critical step in WLAN design as it helps to identify the areas with weak signal strength, interference, and other factors that can impact WLAN performance. By performing a site survey, WLAN designers can ensure that the WLAN network meets the required RSSI coverage for voice services.
Option A is incorrect because enabling 802.11n data rates may not necessarily improve overall performance, especially if the Cisco 7921 IP Phones do not support 802.11n data rates.
Option B is incorrect because disabling 802.11n data rates may not be necessary, even if the Cisco 7921 IP Phones do not support 802.11n data rates. Other devices on the WLAN network may benefit from 802.11n data rates.
Option E is incorrect because RRM (Radio Resource Management) is designed to optimize channel and Tx power settings to improve WLAN performance, which is beneficial for voice services as well. However, RRM should be used with caution as it may cause frequent channel changes, which can impact voice services.
Option F is incorrect because while RRM can be beneficial for WLAN performance, it is not the only way to ensure that channel and Tx power are configured to support voice services. Manual configuration of channel and Tx power settings may also be necessary in some cases.