The SID lets mobile phones that conform to the TIA Cellular or PCS Standard analog, CDMA or TDMA standards recognize when they are in their home system vs. roaming or in another system that can provide them with service.
ANSI-41 is the standard now approved for use as the network-side companion to the wireless-side AMPS (analog), IS-136 (Digital AMPS), cdmaOne, and CDMA2000 networks.
The multitude of incompatible mobile phone systems in the United States and some other countries makes the situation more difficult — it is not clear if the onboard repeaters will be compatible with all of the different cell-phone protocols (TDMA, GSM, CDMA, iDen) and their respective providers.
This acquisition expanded Powerwave's product portfolio in key single carrier markets, such as GSM and TDMA.
Originally, SunCom utilized TDMA as its technology platform when it constructed its wireless network in 1999 and began offering service.
Digital AMPS (IS-54 and IS-136), a 2G mobile-phone standard that uses Time division multiple access
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They are externally similar to the 3310 and 3390, but use Digital AMPS ("TDMA")/AMPS technology rather than GSM.