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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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