CompTIA
CN0-201 · Question #11
CN0-201 Question #11: Real Exam Question with Answer & Explanation
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Question
When a phone is lifted off-hook, it connects the two wires causing an electrical signal to flow from the phone exchange to the phone. What is this electrical signal called?
Options
- AOff-hook signal
- BGround start signal
- CLoop start signal
- DOn-hook signal
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