Definitions for "IS-54"
Keywords:  tdma, interim, amps, nadc, tia
The first evolution in the USA from analogue to digital technology. Used a hybrid of analogue and digital technology, superseded by IS-136 IS-95
Interim Standard 54, for analog and digital cellular radio for all of North America
Original TDMA digital standard. Implemented in 1992 and then upgraded to the latest IS-136 digital standard in 1996.