What feature was introduced in the 802.11h amendment in order to uphold regulatory requirements for 5 GHz operations.

Question

Options

• A256-QAM
• BDistributed Coordination Function (DCF)
• CTransmit Power Control (TPC)
• DRadio Resource Management (RRM)

• B
  6% (1)
• C
  89% (16)
• D
  6% (1)

Explanation

Transmit Power Control (TPC) was introduced in 802.11h specifically to meet regulatory requirements - particularly European ETSI standards - that mandate 5 GHz devices reduce their transmit power to avoid interfering with satellite systems and military/weather radar. TPC allows access points and clients to dynamically negotiate and lower power levels, keeping operations compliant without sacrificing coverage unnecessarily. 256-QAM (A) is a modulation scheme that came with 802.11ac to increase throughput, not a regulatory mechanism. DCF (B) is the basic channel access method from the original 802.11 standard, predating 802.11h by years. RRM (D) is a broader enterprise network management concept, most associated with 802.11k, not regulatory power compliance.

Memory tip: Think of 802.11h as the "Housekeeping" amendment - it keeps 5 GHz operations controlled and safe for coexistence. The two pillars of 802.11h are TPC (power control) and DFS (Dynamic Frequency Selection - radar avoidance). If you remember those two together, TPC will stand out as the regulatory power answer every time.

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