The UTT system design includes the field service tool, mobile, network, hub, and host segments shown in Figure 12. The UTT system design involves near real-time trailer locations via terrestrial communications and visibility into the trailer events and alerts.

• The Field Service Tool Segment is a software package that operates on a handheld computer. This segment communicates with the trailer terminal for configuration and diagnostic purposes.
• The Mobile Segment interfaces with the equipment being tracked. This segment consists of the trailer terminal and the tractor terminal.
• The Network Segment provides a communications link to the mobile segment. This segment consists of the wireless and landline network equipment, the satellite network for tractor terminal, and the CDMA digital wireless gateway.
• The Hub Segment stores and forwards communications between the mobile terminals and the customer, billing, and account maintenance. The hub consists of the Network Operations Center.
• The Host Segment consists of the customer interface for trailer terminal and long-term data storage for the customer. A third-party interface can be included in the host segment.

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