Convergence of IP, ATM, and SONET/SDH at the Backbone
John R. Vacca · Auerbach Publications eBooks · 2000
Traditional technologies are also part of the convergence of the IP, ATM, and SONET/SDH puzzle. So, you have to factor in networking standbys like X.25, T1, Systems Network Architecture (SNA), and dial-up networks over private telephone lines.