EnJet is a Time Division Multiplexing (TMD) feature for the EnStation (EnJet version).
It gives each device using EnJet a timeslot to send, no longer needing to check and wait (CSMA/CA) before sending and still avoiding package collisions. Its intention is to increase overall throughput.
This works best when there is no interference from non-EnJet devices. I.e. when there are only EnJet devices on the selected channel.
EnJet is was enabled by default in some firmwares of devices supporting it.
Devices without EnJet (or with EnJet disabled) will not connect to devices with EnJet enabled.