The first generation of the digital standard time division multiple access technology.

EIA Interim Standard for U.S. Digital Cellular. Original TDMA digital standard. Implemented in 1992. This standard was the first to permit the use digital channels in AMPS systems. It used digital traffic channels but retained the use of analog control channels. This standard was replaced by the IS-136 digital standard in 1996.

First generation TDMA in 1991.

The first generation of the digital standard TDMA technology.

TIA's Interim Specification 54, also called NADC and Digital AMPS, and updated by IS-136. It is a TDMA-based wireless network that operates at 800MHz.