|
The source graphic, a Windows Metafile (WMF), for the TSD can be downloaded here:
TSD
The following discusses how the National ITS Architecture provides the transportation service described by this service package. Each numbered item describes the operation of that portion of the service package identified with the corresponding number on the transaction set diagram.
-
The Information Service Provider Subsystem makes a transit information request to the Transit Management Subsystem (TRMS) or gets from Other ISPs transit service information on behalf of its clients. These information collection activities could be for specific transit routes for a specific client or for the reservation of an advanced service. TRMS responds with the transit and fare schedules and transit schedule adherence information. The Media also can receive transit information such as schedule changes or routes where service is behind schedule, which is provided by the TRMS (transit information for media). In addition TRMS systems can exchange transit traveler information with Other Transit Management systems (transit traveler information coordination).
-
There are two ways for Travelers to request transit traveler information prior to boarding a transit vehicle. The Traveler can provide inputs (traveler inputs) to a Remote Traveler Support Subsystem (typically a kiosk). The kiosk may have some information available locally, or it forwards the transit information user request to the TRMS. The request might be for real time schedule information, or special routing information. The TRMS responds with the requested information (transit traveler information), which is given to the Traveler (part of traveler interface updates). Alternatively, a Traveler makes a transit information user request from a Personal Information Access Subsystem (which could be a personal computer, or a handheld computer) to the TRMS. The TRMS responds with personal transit information.
-
On-board a Transit Vehicle Subsystem (TRVS) a Traveler may also provide traveler inputs to a traveler information device inside the TRVS. The TRVS device will forward the transit traveler request to the TRMS if the information is not resident in the device, and receive the transit traveler information response from the TRMS. The information requested is then provided to the Traveler (traveler interface updates).
-
This market package also supports a simpler operational concept where information is “pushed” to the TRVS by the TRMS (transit traveler information) and provided as a broadcast message to the Travelers as part of traveler interface updates (possibly as stop annunciation or message signs within the TRVS).
|