Monitoring in a busy courthouse lobby shows high channel utilization even though client RSSI looks acceptable. What should the technician understand?
Select an answer to reveal the explanation.
Short Explanation
A loud cafeteria can have great "signal" to the Wi-Fi sign and still no free airtime to talk. Utilization is how busy the channel is; RSSI is how loud the AP sounds. Fine bars, packed medium — that is a classic lobby trap.
Full Explanation
High channel utilization in a busy courthouse lobby means the channel’s airtime is congested, so application performance can suffer even when client RSSI looks acceptable. Utilization measures how much of the medium is occupied by transmissions, management overhead, and contention; RSSI measures received signal strength. Decent bars with a packed channel produce retries, latency, and stalls for kiosk and visitor devices without proving that coverage itself failed. Civic technicians must treat airtime congestion as its own axis and follow the courthouse channel plan, width policy, and load distribution rather than chasing phantom weak-signal fixes.
Claiming high utilization only occurs when every client shows −90 dBm or weaker fails by concept: utilization can be high while clients remain strong near the AP, which is exactly the lobby pattern. Asserting that high utilization proves the AP has the wrong antenna connectors installed fails because connector mistakes affect RF path integrity and loss, not a utilization percentage by themselves. Saying high utilization means dBm readings are invalid and should be discarded fails because utilization and dBm are independent metrics; discarding strength data removes a useful coverage check.
Exam caveat: CWTS separates signal quality/strength from medium congestion—acceptable RSSI does not guarantee usable airtime in crowded civic spaces.
Operational check: capture channel utilization, associated client counts, neighboring BSS overlap, and RSSI at lobby sample points; reduce overlap or width per the approved design if utilization stays high; retest interactive apps; document both utilization and RSSI in the courthouse ticket so on-call staff do not conflate the two.