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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 –
Director of Marketing

Dan Klimke serves as Director, Product Marketing for NetAlly. His 25+ years of experience in the premise cabling and network performance analysis segments of the networking business (first at Leviton Manufacturing, Co. Inc., then at Fluke Networks, Inc., and NETSCOUT Systems, Inc.) provides a deep perspective on the industry and evolution of technologies.