CWDP-305 Exam Dumps : Certified Wireless Design Professional

Comprehensive and Detailed Explanation:

An elevation chart provides a vertical radiation pattern of an antenna, which is essential for understanding how the antenna directs energy above and below the horizon. In bridge link deployments, especially over varying terrains or between buildings of different heights, the elevation pattern helps in aligning antennas to ensure optimal signal propagation and reception. Requesting elevation charts from antenna vendors allows for informed decisions on antenna placement and orientation, leading to more reliable and efficient wireless links.

Channels 116-124 in the 5 GHz band fall under the Dynamic Frequency Selection (DFS) range, which requires devices to vacate the channel if radar signals are detected. Proximity to airports increases the likelihood of radar interference, leading to potential disruptions in Wi-Fi service.

The CWDP-305 Official Study and Reference Guide advises:

"In environments near radar installations, such as airports, it's recommended to avoid DFS channels (e.g., 116-124) to prevent service interruptions due to radar detection requirements."

When APs are deployed in the same physical pattern across floors without channel and physical spacing considerations, co-channel interference (CCI) between floors occurs. This is particularly problematic when APs on different floors are vertically aligned on the same channels.

From CWDP-305:

“In multi-floor deployments, avoid placing APs on the same vertical axis across floors using the same channel. This leads to CCI. Stagger AP locations and vary channels to reduce interference.”

— Reference: CWDP-305 Official Study Guide, Wireless Design Process Chapter