What are "normal" ping / jitter times in a wireless LAN

What are the "normal" response times for jitter and ping in a wireless data only network?  

I'm currently on an 802.11a/n (5 Ghz) device operating in the N arena.  Using PingPlotter Pro I'm seeing an average over 2000 1 second samples of 8ms from ping and 10ms for jitter with spikes as high as 438ms for ping and ~45ms for jitter.  The spikes in both ping and jitter happen about every 60 seconds.

Currently the WLAN is data only however there are plan for future WLAN VOIP and the jitter concerns me.

Thanks
millsusafAsked:
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RartemassLife CoachCommented:
The first group of samples (8ms & 10ms) is about normal. The spikes are way out though.
438ms for a response every minute is unusual.

Do you have other devices that poll the network, like a monitoring tool? If yes then turn it off and check again. If the long response is removed you have your culprit.

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naykamCommented:
seems a little high.

What harware are you using?

A recent WLAN network I was involved in would respond around 1-4ms and that was used for VoIP
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