The following diagram displays the various states of a unit facility visit:
A visit state identifies:
Advised: A unit that is incoming but not certain to arrive at the facility, such as a unit created via an EDI message.
A unit in the Advised state is not visible in XPS.
Active: The current live use of a unit for a facility. The unit can be located on an inbound carrier, in the yard at the facility, or on an outbound carrier.
A unit in the Active state is visible in XPS.
A unit cannot exist in the Active state for more than one facility within a complex. However, a unit can exist in the Active state in more than one complex for an operator.
Departed: A unit that departed a facility on an outbound carrier.
The unit is not located at the facility and is not visible in XPS.
Retired: A special state that indicates that the unit visit life cycle ended at the facility.
For example, when you stuff an empty unit, N4 retires the unit and creates a new full unit. Similarly, if you attach or bundle a unit to another primary unit, N4 retires the attached unit.
N4 also uses the same states for the State (Master) states of a unit, but for a complex instead of a facility. For example, an Advised master state is for a unit that is incoming but not certain to arrive at a complex.