The document discusses the evolution of wireless communication standards from 1G to 3G. 1G devices only supported voice calls, while 2G introduced data communication in addition to voice. 3G devices enable even higher data rates, supporting voice, data, and multimedia streams at rates up to 2Mbps for short distances and 384Kbps for long distances, allowing transfer of video clips and faster multimedia. Popular standards discussed include GSM, CDMA, GPRS, and EDGE, which facilitated the transition to higher data capabilities over time.

1. VOICE ORIENTED DATA
COMMUNICATION

2. Voice –Oriented Data
Communication Standards
• First generation wireless devices
communicated only voice signals.
• The symbol 1G refers to the voice
only communication.
• Nowadays voice transmissions also
carry data.
• 2G devices communicate voice as
well as data signals.

3. • The 3G mobile devices communicate at even
higher data rates and support voice,data, and
multimedia streams.
• 3G facilitates data rates of 2Mbps or higher
for short distances and 384Kbps for long
distance transmissions.
• high data rates in 3G devices enable transfer
of video clips and faster multimedia
communications.

4. GSM
• GSM stands for Global system for mobile communications.
• It was developed by the Groupe Speciale Mobile which was
founded in Europe in 1982.
• The GSM is a standard for mobile telecommunication
through a cellular network.
• data rate upto 14.4 Kbps
• Standard based on GSM:::::::
 GSM900
 EGSM AND GSM900/1800/1900 TRI-BAND
 GPRS[GSM PHASE 2+(2.5G)
 EDGE(enhance data rate for GSM evolution)
 EGPRS (enhanced general packet radio service)

5. CDMA
• CDMA stands for code division multiple access.
• It is the most popular mobile communication
standard.
• The initial evolution of CDMA was as 2.5G.
• It started in 1991 .
• now-a-days support high data rates (3G)
• transmit voice as well as data and multimedia
streams
• CDMA 2000,WCDMA,UMTS,like GSM also
support cellular network

6. CONCLUSION
• with change in time, technology evolves
• can be seen in transition from 1G—2G---2.5G-
-3G(CDMA)
• these comprise voice oriented data
commmunication standards

7. REFERENCES
1. Raj Kamal, Mobile Computing, Oxford
University press, 2007
2. Ankit Anand,Cambridge University Press,2017