Architecture of 2G, 2.5G and 2.75G are same or different?

Question

It would be nice if someone can explain why do we need it ?

Answer 1

Its all different

2G stands for second generation primarily meaning GSM
2.5G primarily means GSM and GPRS, where GPRS is used for the data and GSM(2G) is used for voice
2.75G was used to refer to EDGE (Enhanced Data Rates for GSM Evolution) Networks

Look at the following link
http://tech.queryhome.com/51508/gsm-protocol-architecture
http://tech.queryhome.com/48690/gprs-protocol-stack
http://tech.queryhome.com/58610/gprs-and-umts-protocol-stacks

Comments

Thank you. Can you please share the link with architecture diagram?

---

Check the following images -

GSM
https://www.cse.iitb.ac.in/~satyajit_01/seminar/img3.png

GPRS
https://www.cse.iitb.ac.in/~satyajit_01/seminar/img4.png

---

I had created presentation "Hello World to LTE", you can see it, it gives a view of how technology evolved with respect g's
http://www.slideshare.net/SachidanandaSahu/lte-basics-38981573