A customer is acquiring a new VoWLAN system to replace their existing wired phone system.

Signal-to-Noise Ratio (SNR) is a critical metric in VoWLAN deployments, as voice applications are sensitive to latency and require clear signal quality. SNR is calculated by subtracting the noise floor from the received signal strength indicator (RSSI).

Given:

Required SNR: 25 dB

Noise floor: -88 dBm

To achieve the required SNR:

RSSI = Noise Floor + SNR

RSSI = -88 dBm + 25 dB = -63 dBm

The CWDP-305 Official Study and Reference Guide emphasizes the importance of maintaining adequate SNR for voice applications:

"Voice over WLAN requires a minimum SNR to ensure call quality and reliability. Designing for appropriate RSSI levels relative to the noise floor is essential."

Therefore, to meet the system's requirements, the minimum RSSI should be -63 dBm.