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The National Motor Freight Classification ( NMFC) is a North American voluntary standard that provides a comparison of commodities moving in interstate, intrastate and international commerce via freight shipment. The standard is developed and maintained by the Freight Classification Development Council (FCDC) and published by the National Motor ...
Distance measuring equipment. In aviation, distance measuring equipment ( DME) is a radio navigation technology that measures the slant range (distance) between an aircraft and a ground station by timing the propagation delay of radio signals in the frequency band between 960 and 1215 megahertz (MHz). Line-of-visibility between the aircraft and ...
The first technique developed was the far-field range, where the antenna under test (AUT) is placed in the far-field of a range antenna. Due to the size required to create a far-field range for large antennas, near-field techniques were developed, which allow the measurement of the field on a distance close to the antenna (typically 3 to 10 ...
Signal speeds. Federal regulators limit the speed of trains with respect to the signaling method used. [ 1] Passenger trains are limited to 59 mph (95 km/h) and freight trains to 49 mph (79 km/h) on track without block signal systems. (See dark territory .) Trains without "an automatic cab signal, automatic train stop or automatic train control ...
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A graphical display of AIS data on board a ship. The automatic identification system ( AIS) is an automatic tracking system that uses transceivers on ships and is used by vessel traffic services (VTS). When satellites are used to receive AIS signatures, the term Satellite-AIS (S-AIS) is used. AIS information supplements marine radar, which ...
Digital selective calling ( DSC) is a standard for transmitting predefined digital messages via the medium-frequency (MF), high-frequency (HF) and very-high-frequency (VHF) maritime radio systems. It is a core part of the Global Maritime Distress Safety System (GMDSS). [ 1] A DSC touch screen control panel showing a (simulated) distress message.
The Standard Carrier Alpha Code ( SCAC) is a privately controlled US code used to identify vessel operating common carriers (VOCC). It is typically two to four letters long. The National Motor Freight Traffic Association developed the SCAC code in the 1960s to help road transport companies computerize data and records. [ 1]