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This visualization shows Round-trip time (RTT) measured in milliseconds. RTT is the length of time it takes for a data packet to be sent from the client to the server and back.
RTT affects application responsiveness: A high RTT value means that an application server's response to a client request is slow. RTT also affects end user experience in audio and video streaming applications, because a high RTT value will inevitably cause a VoIP lag. Varying RTT might also cause VoIP jitter.
When the surveyor walks the facility during an active survey, the adapter periodically renegotiates the PHY rate and roams to new APs. During these periods of time, RTT values might peak, which is normal.
Suggested Solutions
When areas with consistently high RTT are discovered, the following solutions are suggested:
| § | Common reasons for high RTT values are interference and excessive network traffic. The Signal-to-Interference Ratio visualization available for passive surveys might provide insight into interference issues. Excessive network traffic might be caused either by oversubscription (too many clients per AP) or by excessive network load by some clients. The former can be addressed by increasing the number of APs, while the latter should be verified and handled by network traffic monitoring software. |
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