North American digital cellular (also called United States digital cellular, or USDC); a time division multiple access (TDMA) system that provides three to six times the capacity of AMPS

North American Digital Cellular or North American Digital Cordless

A TIA standard that is specified as IS-54 and was adopted in 1992. It has since been updated, and it is now called IS-136. It uses TDMA and TDD schemes, and it offers a total of three time slots. It operates on the 800MHz frequency band, uses AMPS for signaling to reserve resources, and transfers speech in digital form; therefore, it is a digital overlay that is interoperable with analog AMPS infrastructure. UWC-136, an advancement of the U.S. TDMA (IS-136) standard, uses EDGE technology.

Naval Air Development Center (USN)

National Australia Day Council