From the technology with which Alexander Graham Bell yelled,
“Mr. Watson, come here!” to crank, dial and touch-tone phones
and continuing with Ethernet from 10 million bits per second to
10 billion, a pair of copper wires has been the mainstay of
communications. Needless to say, some serious technical
development was required to get to today’s cables. How well do
you know the path that communications copper wire has taken?
Correct answers and explanations are in red text. 1. Plain old
telephone service (POTS) could be easily transmitted over almost
any pair of copper wires because _________. A. It used current
loop transmission technique B. It only needed 300-3,000 Hertz
bandwidth C. Both A and B D. Neither A nor B Analog telephone
signals (POTS) use a current loop over a frequency range of
300-3000 Hz. 2. One of the first uses of twisted-pair cables for
computer networking was IBM Type 1 cable for token ring
networks, which was a(n) _________. A. Unshielded twisted-pair
cable with 150 ohm (?) impedance B. Sh