Question 600
Following an incident at a hospital floor, the WLAN team documented this condition: An engineer treats shorter guard intervals as universally superior even on an RF path with significant delay spread. Which ongoing safeguard MOST directly prevents recurrence?
Explanation
Correct Answer
Use representative multipath tests when tuning symbol timing parameters. This repeatable safeguard addresses the mechanism—guard intervals protect OFDM symbols from propagation-delay interference at some airtime cost—and reduces the chance that the specific fault recurs.
Incorrect Answers
Validate OFDMA expectations against deployed station-generation inventories. This protects against another issue—an 802.11ax AP is provisioned for OFDMA but an older 802.11ac station shows no allocated resource units—but is not the most direct prevention for an engineer treats shorter guard intervals as universally superior even on an RF path with significant delay spread.
Trend retry percentage and aggregation outcomes alongside reported link rate. This protects against another issue—a network reporting tool reads a high PHY rate despite frequent retransmitted aggregates on a noisy WLAN—but is not the most direct prevention for an engineer treats shorter guard intervals as universally superior even on an RF path with significant delay spread.
Review channel-width choices against local spectrum before applying dense 2.4 GHz profiles. This protects against another issue—a crowded office uses 40 MHz channels throughout 2.4 GHz and experiences severe overlap with neighboring APs—but is not the most direct prevention for an engineer treats shorter guard intervals as universally superior even on an RF path with significant delay spread.