What are PSTN,ISDN,CDMA,GSM?

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r.vittalkiran said:
What is PSTN,ISDN,CDMA,GSM??
What are their Differences?
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PSTN - Public switched telephone network

ISDN - Integrated services digital network

CDMA - Code Division multiple access

GSM - Global system for mobile communication

Did you even bother to Google these terms? They are all on the internet.

I am not going to tell you the differences, look them up on your own.
 
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