Transport network evolution strategies for ATM based B-ISDN

The capabilities of existing transport networks and of synchronous digital hierarchy systems are discussed. The evolution of these networks toward the target broadband integrated services digital network based on asynchronous transfer mode implies new ATM-based transmission standards. This point is highlighted through the possible introduction strategies. Specifically, the introduction strategy that starts with the CCITT G.702 series and SDH and proceeds toward an optimized ATM transmission network is discussed, and the major advantages and disadvantages of each choice are outlined