Hi, what you could do as a test is create an ACL for the VP units or one at least, then create a test wifi using wpa-tkip, map the test network to your APs then test, I know a few years ago the vocollect units did not handle wpa very well, so we had to use wep-128 and an ACL, ( at the time they used symbol wifi cards so we could enable keyguard as well. Like I say it was along time ago. Do Lucas give any recommendations for the wlan settings or even the VP units themselves i.e firmware updates etc, How is the wlan setup ? are you using smart RF ? I recall a job where we supplied the PDT / MDT units, And the performance was terrible, It was another supplier that installed the wifi kit, which was cisco wlan controller, The site was huge and the AP's were all mounted high above the racking. The site was sporting goods. the wlan controller was using the cisco smartRF , as the AP's had clear site of each other they were backing the power off, they were also over 15m in the air with standard rubber duck antenna., anyway it was suggested that the smart RF was turned off and the power adjusted manually,( site survey ) and eventually we sorted it,