>what is the exact working of CSU/DSU?

        Modem on Steroids

>what is the purpose of serial interfaces?

        to provide an interface for Serialised data transfer

>what is Bert?

        Ernies Roommate (from Sesame Street)

>what is the difference b/w CRC4 & CRC16.

        12

>what is the working principal of NET2Phone.

        Don't you mean principle ? If so, VoIP with softphones.


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