There are three different types of Pre-Deployment Site Surveys, Active Surveys, Passive Surveys and Hybrid Surveys. An Active Survey uses an adapter to measure packets in two directions (send and receive), it is then associated with a number of access points and used to measure round trip times, throughput rates etc. The Active Survey is great for analysing a wireless set-up.
A Passive Site Survey, uses a wireless adapter that is not associated to any WLANs but will passively listen to the wireless traffic. These are great for system design purposes.
The Hybrid Site Survey, which is the Pre-Deployment Survey we perform, combines both the active and passive site surveys together to provide both the engineer and client with the most amounts of data possible. The Hybrid Survey is extremely accurate and should be carried out if you’re planning a new wireless network for any large or complex sites.
Please note this can be used for both indoor and outdoor wireless deployments.