Final answer:
When a fire alarm signal needs to be sent while someone is talking on the phone, the fire alarm signal takes priority and will interrupt the phone call. The telephone line can handle both analog phone calls and digital fire alarm signals simultaneously, but the fire alarm signal will be given priority to ensure safety.
Step-by-step explanation:
When a person is talking on the phone and a fire alarm signal needs to be sent, the fire alarm signal takes priority over the phone call. The fire alarm signal will interrupt the phone call and be transmitted through the telephone line. This interruption may be heard as a brief interruption or noise on the call.
Telephones use an analog signal to transmit voice, while fire alarm signals are typically transmitted using digital signals. The telephone line can handle both analog and digital signals simultaneously, but the fire alarm signal will be given priority to ensure the safety of the occupants. Once the fire alarm signal is transmitted, the phone call can resume.