ISDN, BISDN, X.25, FrameRelay, ATM Networks: A Telephony View of Convergence Architectures
https://www.powershow.com/view/b4c4a-OGU1N/ISDN_BISDN_X_25_FrameRelay_ATM_Networks_A_Telephony_View_of_Convergence_Architectures_powerpoint_ppt_presentation
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