An improvement to the IS-54 standard that added a digital control channel (DCCH) for residential and in-building coverage, increased battery standby time, text messaging, overthe-air activation, and circuit switched data (CSD) capabilities. See also CSD, DCCH, IS-54, and texting.
See IS-136 in Computer
(Interim Standard-136) The second generation of the TDMA digital cellular system. TDMA operates in North America in the 800 MHz band and 1.9 GHz PCS band. First introduced in 1994, IS-136 is also known as "Digital AMPS" and "D-AMPS." See TDMA and IS-54.
