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North American Time Division Multiple Access (NA-TDMA) or IS-136 is a
TDMA system used primarily in North America. IS-136 employs a pi/4
Differential Quaternary Phase Shift Keying (pi/4-DQPSK) modulation
scheme. The channel spacing is 30 KHz which provides backward
compatibility with the Advanced Mobile Phone Service (AMPS) analog
standard. By combining NA-TDMA with AMPS, nationwide footprints are
achievable. IS-54/136 was the first North American digital cellular
system to provide the user "roaming" flexibility by combining digital
and analog wireless access methods within a single handset.
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| Cellular | TRF1015 | TRF2020, TRF2050 | TRF8010, TRF7003 | |
| PCS | TRF2052 | |||
| Dual-Band | TRF1500 | TRF3040 |
