Echo cancellation is the technique used in north America for______________
A. the ISDN digital subscriber line1
B. the ISDN digital subscriber line
C. the ISDN digital subscriber line2
D. the ISDN digital subscriber line65
Answer:B
Echo cancellation is the technique used in north America for______________
A. the ISDN digital subscriber line1 B. the ISDN digital subscriber line C. the ISDN digital subscriber line2 D. the ISDN digital subscriber line65