Monday, August 31, 2009
Reverse Telephone Lookups / Searches
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Saturday, August 29, 2009
Discover
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Innovative new phones.
Money-saving products and services.
Personalization options that are all you.
Exclusive events, contests, and sweepstakes.
Inspired new ways to put your values into practice.Discover more
Friday, August 21, 2009
Mobile data terminal
A mobile data terminal (MDT) is a computerized device used in public transit vehicles, taxicabs, courier vehicles, service trucks, commercial trucking fleets, military logistics, fishing fleets, warehouse inventory control, 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. MDTs may be simple display and keypad units, intended to be connected to a separate black-box or AVL (see below) computer. While MDTs were originally dumb terminals most have been replaced with fully functional PC hardware, known as MDCs (Mobile Digital Computers). While the MDC term is more correct, MDT is still widely used. Other common terms include MVC (Motor Vehicle Computer) and names of manufacturers such as iMobile or KDT.
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. MDTs may be simple display and keypad units, intended to be connected to a separate black-box or AVL (see below) computer. While MDTs were originally dumb terminals most have been replaced with fully functional PC hardware, known as MDCs (Mobile Digital Computers). While the MDC term is more correct, MDT is still widely used. Other common terms include MVC (Motor Vehicle Computer) and names of manufacturers such as iMobile or KDT.
Technology
In the earlier days of computer-aided dispatching (CAD), 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.
For many industrial applications, such as commercial trucking, GIS, agriculture, mobile asset management, and other industries, custom electronic hardware is still preferred. Custom terminals use I/O interfaces that connect directly to industry-specific equipment. They are usually environmentally hardened packages with power supply protection and robust memory file systems that greatly improve reliability and task efficiency. MDT solutions that are based on ruggedized consumer products or consumer available software will typically not have the life cycle duration expected in industrial applications, over 5 years.
For many industrial applications, such as commercial trucking, GIS, agriculture, mobile asset management, and other industries, custom electronic hardware is still preferred. Custom terminals use I/O interfaces that connect directly to industry-specific equipment. They are usually environmentally hardened packages with power supply protection and robust memory file systems that greatly improve reliability and task efficiency. MDT solutions that are based on ruggedized consumer products or consumer available software will typically not have the life cycle duration expected in industrial applications, over 5 years.
Typical MDT features
9 VDC to 36 VDC input power.
Electrical transient protection, such as described in ISO 7637, Electrical disturbance on road vehicles.
Serial port to connect to a satellite or terrestrial radio transceiver.
Digital I/O to monitor external events.
Removable medial or I/O port of retrieving data or upgrading software.
Wide operating temperature -10 C to 70 C or better.
Drop tested to MIL-STD 810E, which specifies multiple drops from 48" to plywood over concrete.
Sealed against dust and liquid.
Connections to industry specific equipment, such as J1708 data bus for commercial truck applications.
Display technology specific to viewing conditions for the intended industry (LCD, TFT LCD, Vacuum fluorescent display, CSTN).
Integrated un-interruptible power supply, which will ride through electrical brown-outs typical in vehicle installations.
Internal 802.11b transceiver (depending on target application), possibly with external antenna connection.
A related device classification, specific to the transportation industry, is called automatic vehicle location (AVL). Mobile data terminals are often used in conjunction with a ¨black box¨ that contains GPS receiver, cell phone transceiver, other radio devices, or interfaces to industry-specific equipment. AVL devices may be simple stand-alone modems or may include operating systems with application space for the system integrator.
Electrical transient protection, such as described in ISO 7637, Electrical disturbance on road vehicles.
Serial port to connect to a satellite or terrestrial radio transceiver.
Digital I/O to monitor external events.
Removable medial or I/O port of retrieving data or upgrading software.
Wide operating temperature -10 C to 70 C or better.
Drop tested to MIL-STD 810E, which specifies multiple drops from 48" to plywood over concrete.
Sealed against dust and liquid.
Connections to industry specific equipment, such as J1708 data bus for commercial truck applications.
Display technology specific to viewing conditions for the intended industry (LCD, TFT LCD, Vacuum fluorescent display, CSTN).
Integrated un-interruptible power supply, which will ride through electrical brown-outs typical in vehicle installations.
Internal 802.11b transceiver (depending on target application), possibly with external antenna connection.
A related device classification, specific to the transportation industry, is called automatic vehicle location (AVL). Mobile data terminals are often used in conjunction with a ¨black box¨ that contains GPS receiver, cell phone transceiver, other radio devices, or interfaces to industry-specific equipment. AVL devices may be simple stand-alone modems or may include operating systems with application space for the system integrator.
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