The correct answer is: D. G3G-MC-CDMA-1X
Cdma2000 1xRTT is also known as G3G-MC-CDMA-1X within the ITU IMT-2000 body. It is a third-generation (3G) cellular technology that uses code-division multiple access (CDMA) as its air interface. Cdma2000 1xRTT is a time-division duplex (TDD) system, which means that it uses different time slots for uplink and downlink traffic. It has a maximum data rate of 1.2 Mbps in the downlink and 300 kbps in the uplink.
Cdma2000 1xRTT is a backward-compatible technology, which means that it can be used on existing CDMA networks. It is also a scalable technology, which means that it can be upgraded to higher data rates in the future.
Cdma2000 1xRTT is widely used in North America, South America, Asia, and Europe. It is the second most popular 3G technology in the world, after UMTS.
Here is a brief explanation of each option:
- A. Cdma2000 1xEV-DO is a 3G CDMA technology that offers higher data rates than Cdma2000 1xRTT. It is not backward-compatible with Cdma2000 1xRTT.
- B. Cdma2000 1xEV-DV is a 3G CDMA technology that offers even higher data rates than Cdma2000 1xEV-DO. It is not backward-compatible with Cdma2000 1xRTT or Cdma2000 1xEV-DO.
- C. IS-95B is a 2G CDMA technology. It is not backward-compatible with Cdma2000 1xRTT.
- D. G3G-MC-CDMA-1X is the ITU IMT-2000 designation for Cdma2000 1xRTT.