Current FSM state of the PU as follows:
linkReset
- Link is in reset state - not connected
linkPendConnOut
- Pending ConnectOut to establish link
linkPendConnIn
- Pending ConnectIn to establish link
linkPendXid
- Pending XID negotiation on the link
linkXidNeg
- XID negotiation proceeding on link
linkConnOut
- ConnectOut link activation
linkConnIn
- ConnectIn link activation
linkConnected
- Link connected, PU inactive
puPendAct
- Link connected, PU pending activation
puActive
- Link connected, PU active
puBusy
- Link connected, PU busy
puPendInact
- Link connected, PU pending deactivation
linkPendDisc
- Pending disconnect of link
linkPendClose
- Pending close of link station