Architecture Interconnects*
The Subsystem Diagram includes the four main architecture interconnect types that are used for communications among subsystems, and between subsystems and terminators. The more detailed Physical Architecture Diagrams (for example Vehicle Subsystem Terminator Interfaces) include additional architecture interconnect types, some of which support additional terminator interfaces (e.g., Human Interface) and some of which describe subsets of the four main interconnect types. The entire list of architecture interconnect types follows.
Contact or Proximity Interface
An extremely short range or contact interface. The primary example of this interface is the interface between a card carried by a traveler (e.g. smart card) and a card reader.
Field - Vehicle Communications
A wireless communications channel used for close-proximity communications between vehicles and the immediate infrastructure. It supports location-specific communications for ITS capabilities such as toll collection, transit vehicle management, driver information, and automated commercial vehicle operations.
Fixed Point - Fixed Point Communications
A communications link that provides communications among stationary entities. It may be implemented using a variety of public or private communication networks and technologies. It can include, but is not limited to, twisted pair, coaxial cable, fiber optic, microwave relay networks, spread spectrum, etc.
Human Interface
Interface between a human user and a device. Can be a user interface to a computer system, an operator interface, or the driver’s interface to a vehicle.
Internal Vehicle Interface
Communications between components within an individual vehicle. This may represent communications across an intelligent vehicle bus or any other communications medium internal to the vehicle.
Physical Interface
Represents physical characteristics that ITS sensors detect or measure. For example, it may represent obstacles that are detected by vehicle sensors, environmental conditions that are measured by environmental sensors, and boarding passengers that are detected by transit passenger counting systems.
Position Location Interface
Interface between position location equipment and an ITS device that uses location information. This typically represents the interface between GPS equipment and a vehicle or mobile device, but it covers any interface between a location provider and a location consumer application.
Vehicle - Vehicle Communications
A short range wireless communications link among vehicles (e.g. mobile system to mobile systems). Advanced vehicle services may use this link in the future to support advanced collision avoidance implementations, road condition information sharing, and active coordination to advanced vehicle control systems.
