 end of the link is configured to run PTP, it will receive and process these messages-terminating the PTP flow. This profile is designed to allow selection of the best reference source based on clock quality trace- ability (combined with an optional configurable local priority), which helps it automatically estab- lish an optimal network topology for the time distribution. This process is rerun whenever there is a failure event or rearrangement in the network, in order to converge on a new topology. The T-BC or T-TSC runs a single PTP clock that has one or more PTP ports. The aBMCA in the clock processes the Announce messages that it receives on its ports and decides what state each port should be in. Because this profile is only communicating over a single hop to its neighbor, every PTP port could be receiving different Announce information. Based on the Announce message and the configured local priority, the aBMCA will then place each port in either master, slave, or passive state. After the aBMCA surveys the ports, the one selected to be a source of time will be placed in slave state, and the other candidates will be placed in passive state (there is only one port in slave state at any one time). Other ports are placed in the master state (to give downstream clocks the possibility to accept time). See the earlier sections "The Announce Message" and "Best Master Clock Al- gorithm" for more details. The main use for this profile is to carry frequency, time, and phase across a WAN, and today it is most commonly deployed for mobile technologies that need phase synchronization (especially 5G and time division duplex (TDD) radios). G.8275.2-Telecom Profile for Phase/Time Synchronization with Partial Tim- ing Support from the Network This recommendation defines a profile intended to be used to carry frequency and phase/time across a packet network and where SyncE is optional. This profile is based on a network with partial tim- ing support (PTS) or the special case of assisted partial timing support (APTS). Using thi