Which of the following technologies came first chronologically?
A) Integrated Services Digital Networks (ISDN)
B) leased transmission lines
C) T-1 lines
D) digital subscriber lines (DSL)

Question

Quizplus · Accepted Answer

Leased transmission lines were first introduced in the early 1960s, while ISDN was introduced in the 1980s, T-1 lines in the 1960s and DSL in the late 1990s.

Which of the Following Technologies Came First Chronologically