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Cellular Phone Forum / Providers / ATT Wireless / March 2004TDMA Question
If a phone is described as "AT&T Compatible D-AMPS 800/1900/AMPS 800", does this mean it's definately TDMA or could that apply to CDMA also? Thanks. No. D-Amps was ver 1 of TDMA. So what the specs are saying, is that the phone is capable of 800 and 1900Mhz TDMA and AMPS ( analog ) 800Mhz. Scotty > If a phone is described as "AT&T Compatible D-AMPS 800/1900/AMPS 800", does > this mean it's definately TDMA or could that apply to CDMA also? > > Thanks. > No. > > D-Amps was ver 1 of TDMA. > So what the specs are saying, is that the phone is capable of 800 and > 1900Mhz TDMA and AMPS ( analog ) 800Mhz. You are partially correct. D-AMPS is a somewhat archaic term typically used in as a stand-in for the initial version of TDMA, IS-54. NADC (North American Digital Cellular) is another name. IS-136 is the current version - if there truly is such a thing - of TDMA. The primary distinction between IS-54 & IS-136 is that IS-54 replaced the AMPS AVC (analog voice channel) w/ a DQPSK-modulated TDMA DTCH (digital traffic channel) but retained the non-TDMA AMPS control channels, while IS-136 finally replaced the AMPS control channels w/ a DQPSK-modulated TDMA DCCH (digital control channel). Relevant to the initial poster, IS-54 was never deployed at 1900 MHz as AMPS control channels are non-existant in the PCS band. Thus, if the phone is TDMA 1900 capable, then it is IS-136. Andrew -- Andrew Shepherd cinema@ku.edu cinema@sprintpcs.com http://www.ku.edu/home/cinema/ >If a phone is described as "AT&T Compatible D-AMPS 800/1900/AMPS 800", does >this mean it's definately TDMA or could that apply to CDMA also? It's TDMA not CDMA. Such models as Ericsson LX677 are called "D-AMPS" buy can be used on the TDMA network. - - - - - - - - - - - - - - - - - - - - - - - - - - remove NONO from .NONOcom to reply |
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