As of this writing (February, 2020) there are four SAS Administrators approved: Federated Wireless, Google, CommScope and Sony. Because there is more than one SAS operating, the SAS Administrators must coordinate spectrum not only among all of the transmitting devices within their purview, but also devices being managed by the others. This occurs during each overnight period, known as a Coordinated Periodic Activity Among SASs (CPAS), so the entire system is aware of all devices operating in the band.