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Know the Relationship Between QoS and Voice Over WiFi

Packet drops and jitter can greatly reduce the quality of a Voice Over WiFi call. When troubleshooting Voice Over WiFi call quality issues the following items should be looked at.

• QoS Configuration
• Latency
• Jitter
• Signal Strength
• SNR
• Roaming
• Packet Loss

A simple ping test can be used to exam the latency. The latency should not exceed 150ms, ideally it should be much less. Also, the latency should be consistent; as to not introduce jitter or variance in the latency (jitter should be less than 30ms).

You should also validate signal strength, which should be -67dBm or stronger; and you should have an SNR higher than 25dBm. Last, but not least packet loss should be less than 1%.

A WiFi network analyzer like the EtherScope® nXG Portable Network Expert can be used to greatly reduce the amount of time troubleshooting such issues. For example, a WiFi Analysis test can be used to gather all the stats along with ping times from the two end points in one simple test.

Author Bio –
Product Manager – Wireless

Julio Petrovitch is a product manager at NetAlly, plus a certified CWNA/CWAP/CWDP/CWSP. He’s worked with network design, testing and validation for more than 15 years. Throughout he’s career he has had the opportunity to work with multiple networking technologies, including POTS, DSL, Copper/Fiber Ethernet, Wi-Fi, Bluetooth, and BLE.