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10 Base T
A network format that uses Ethernet and transmits at a maximum of 10 megabits per second
100 Base T
A network format that uses Ethernet and transmits at a maximum of 100 megabits per second.
20 ma Current Loop
A form of multi-drop asynchronous communication. There are several forms but all are characterized by the use of a differential signal and therefore relatively long transmission distances of 1,000 to 4,000 feet.