An me1200PtpNotifsPortStateChange notification is sent when the Port State changes occurs.
Port State is an enumerated integer value. Description of various possible Port States is:
          
initializing   - In this state a port initializes
                 its data sets, hardware, and
                 communication facilities.
          
faulty         - The fault state of the protocol.
          
disabled       - The port shall not place any
                 messages on its communication path.
          
listening      - The port is waiting for the
                 announceReceiptTimeout to expire or
                 to receive an Announce message from
                 a master.
          
preMaster      - The port shall behave in all respects
                 as though it were in the MASTER state
                 except that it shall not place any
                 messages on its communication path
                 except for Pdelay_Req, Pdelay_Resp,
                 Pdelay_Resp_Follow_Up, signaling, or
                 management messages.
master         - The port is behaving as a master port.
          
passive        - The port shall not place any
                 messages on its communication path
                 except for Pdelay_Req, Pdelay_Resp,
                 Pdelay_Resp_Follow_Up, or signaling
                 messages, or management messages
                 that are a required response to
                 another management message
          
uncalibrated   - The local port is preparing to
                 synchronize to the master port.
          
slave          - The port is synchronizing to the
                 selected master port.
          
p2pTransparent - The port is in point to point
                 transparent state.
          
e2eTransparent - The port is in end to end
                 transparent state.

An me1200PtpNotifsClockSlaveStateChange notification is sent when the clock slave state changes.
Clock Slave Sate is an enumerated integer value. Description of various possible Port States is:
          
Freerun      - Applies to a slave device that is not locked to
              a master. This is the initial state a slave starts out with
              when it is not getting any PTP packets from the master or because of
              some other input error (erroneous packets, etc).
FreqLocking  - The slave device is receiving packets from a
              master and is trying to acquire a frequency lock.
PhaseLocking - The slave device is receiving packets from a
              master and is trying to acquire a phase lock.
Locked       - Locked to the master with respect to
              frequency and phase.
Holdover     - In this state the slave device is locked to a
              master but communication with the master is lost or the
              timestamps in the ptp packets are incorrect. But since the
              slave was locked to the master, it can run with the same
              accuracy for
              sometime. The slave can continue to operate in this state for
              some time. If communication with the master is not restored for
              a while, the device is moved to the FREERUN state.
Invalid      - The slave is in Invalid state.

An me1200PtpNotifsUnicastCommunicationStateChange notification is sent when the unicast communication
state changes (A unicast slave reports change in the communication state to the configured masters).
Unicast communication state is an enumerated integer value.
Description of various possible states is:
          
idle        - When communication state is idle.
intializing - When communication state is initializing.
connected   - When communication state is connected.
selected    - When communication state is selected.
synced      - When communication state is synced.

An me1200PtpNotifsUnicastSlaveAppears notification is sent when a unicast slave appears.

An me1200PtpNotifsUnicastSlaveDisappears notification is sent when a unicast slave disappears.