ISDN, B-ISDN, X.25, Frame-Relay, ATM Networks: A Telephony View of Convergence Architectures
https://www.powershow.com/view4/4dde95-NWZmN/ISDN_B-ISDN_X_25_Frame-Relay_ATM_Networks_A_Telephony_View_of_Convergence_Architectures_powerpoint_ppt_presentation
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