PSTN/ISDN evolution scenarios to Broadband convergence Network are shown with scenario 1, scenario2, and scenario 3. Scenario I is divided into step I and step 2 as shown in Figure 2, scenario 2 is also divided into step I and step 2 as shown in Figure 3, and scenario 3 is one step approach as Figure 4. While, xDSL evolution scenario to BcN is shown with step 1, step 2, and step 3 as shown in Figure 5. All of these evolution scenarios can be guided to operators and operators will implement these scenarios for legacy network evolution to BcN.