Link measurement tool for WiFi QOS?

Greetings:

I am interested in VOIP and Video Conferencing over WiFi.  Both these 
are jitter sensitive and are best deployed with a guaranteed QOS 
(Quality of Service). Has anyone come across a good free logging device 
like Netstumbler that would allow me to not just measure signal strength 
and data rates but also consistent data through put of a WiFi link?

As you know, when just doing web surfing and emailing the data speed may 
appear to be relatively good even though there may be a lot of 
retransmissions.  Whereas with VOIP or Video, the audibility of voice or 
visual look can be greatly compromised when data exceeds 250 msec to 
complete a round-trip.

Chuck Lare


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