For what purpose was twisted pair cable first used?
Correct answer: B. Telephone
- A. Wireless signal
- B. Telephone
- C. Wi-Fi
- D. Digital data transmission
Explanation
Twisted-pair cable was invented by Alexander Graham Bell in 1881 specifically to reduce crosstalk between telegraph wires. This crosstalk made it difficult to transmit clear telephone signals. By twisting the wires together, Bell was able to cancel out some of the electromagnetic interference. Today, twisted pair cable is still widely used for telephone communication, as well as for Ethernet networking.
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