Intelligent Polling (or the iPoll Protocol) is a proprietary wireless mechanism customized for best performance in harsh environments.
Bandwidth allocation between the Master and the Slave devices is managed by the Master device. The Master device polls each Slave device sequentially. The Slave device only transmits the data “upstream” to the Master device when the Master device gives authorization via a “transmit grant”.
On iPoll, slower connections will not limit the speed for users who have better options to receive maximum throughput. The reason for this is the mechanism that works in multi-point scenarios. When there are clients who have no or very few packets to send, the AP skips them and moves to the faster clients (those who have more data to send). Thus, users that have better signal levels (and less interference) maximize their performance, while others, who run on low modulations, are limited by the AP.
iPoll implements the airtime fairness mechanism by letting faster users to send more data than slower users, which means that faster users will usually have more time for sending and receiving data. The total throughput will therefore be higher. This is achieved by using a token mechanism between the AP and the Station. Tokens includes all of the sensitive control data for each device connected to the AP.