A slave device may be configured to receive at least one bus interface clock and bus interface signals from a bus coupled to the at least one bus interface unit. One embodiment of the ladder module comprises a spine and at least two steps pivotally mounted to the spine. The collision detection and data synchronization mechanism defines the set of processes and algorithms used to track distributed data objects and to manage changes to the distributed objects throughout a network of intelligent computing devices. The container can also include an outer sleeve bonded to an outer surface of the foam support layer.