Explain the following transitions with respect to an NGN network

Explain the following transitions with respect to an NGN network:

(a) Circuit switching to Packet switching.

(b) IT and CT into ICT.

(c) Narrowband to Broadband.

Explain in brief:

(a) MSP (b) ISP (c) TSP

Explain OFDM in detail. What is the use of guard period?


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