An IT administrator is trying to establish the criteria for a predictive coverage design. The environment is a mix of 802.11g data and voice. Which minimum coverage with SNR 25 aligns with Cisco…

-75 dBm falls below the -67 dBm minimum required for voice-grade coverage, making this insufficient even though the 20-25% overlap value is within range.

-80 dBm is only marginally acceptable for basic data and is well below the voice threshold, and 10% intercell overlap is too low to support seamless voice roaming handoffs.

-72 dBm does not meet the Cisco voice standard of -67 dBm, and 11% intercell overlap is insufficient for the proactive roaming required in a voice environment.

Cisco voice-grade wireless design guidelines require a minimum received signal of -67 dBm and 15-20% cell overlap so clients have sufficient signal for voice quality and can roam proactively before signal degrades below acceptable thresholds. Combined with an SNR of at least 25 dB, the -67 dBm threshold satisfies both the data and voice coverage requirements in a mixed 802.11g environment.