Mobile data terminal
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A mobile data terminal is a computerized device used in taxicabs, courier vehicles, service trucks, and emergency vehicles to communicate with a central dispatch office. Mobile data terminals feature a screen on which to view information and a keyboard or keypad for entering information, and may be connected to various peripheral devices. Standard peripherals include two-way radios and taximeters, both of which predate computer assisted dispatching.
Evolution
In the earlier days of computer-assisted dispatching, many MDT's were custom devices, used with specialized point to point radios, particularly in applications such as police dispatching. While applications like taxi and package delivery often still use custom designed terminals, many CAD systems are switching to common (or ruggedized) laptops and Wide-Area Wireless IP communications, utilizing the Internet or private IP networks connected to and over it.
External Links
Microbus mobile data (http://mobile-data.microbus.com) A UK based manufacturer of mobile data terminals