Retransmission of signals for a remote station system can be accomplished by which of the following means?

• A. A dedicated circuit
• B. One way telephone
• C. A private radio transmission
• D. Fiber optic link

Answer: (D)

Retransmitting signals for a remote station demands a medium that keeps signal quality high over distance and is resistant to electrical noise and disturbances. A fiber optic link does that best because the data travel as light through glass, which is inherently immune to electromagnetic interference, not prone to ground loops or lightning surges, and can handle very high bandwidth over long runs. This combination makes it reliable for sending alarm signals from remote stations to a central point.

Other options have drawbacks: a dedicated circuit on copper can work but tends to be costly, has limited distance capability, and is more vulnerable to electrical noise; a one-way telephone line uses older copper technology with limited bandwidth and reliability; a private radio transmission is wireless and can face interference, licensing requirements, and security concerns, plus potential coverage gaps.