Answer is : 3G
Explanation:
When we comes to 3G
Packet-switched networks moves data in separate, small blocks -- packets -- based on the destination address in each packet and receives, packets and reassembled in proper sequence to make up message. Circuit-switched networks shows dedicate point-to-point connections during calls.
Circuit-switched networks used for phone calls and packet-switched networks handled data. But because of the reach of phone lines and the efficiency and low cost of data networks, the two technologies have shared chores for years.
Ans 28.(c) Improve Voice Quality so that it is on par with PSTN (Public Switched Telephone Network)
IMT-2000 based on Flexibility,Affordability,Compatibility with existing systems,Modular Design. It improves voice quality with PSTN.
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