When testing dial tone on a POTS line with the phone on the hook, what reading should the technician expect?

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Multiple Choice

When testing dial tone on a POTS line with the phone on the hook, what reading should the technician expect?

Explanation:
POTS lines are powered by a central office supply that provides a constant DC voltage to the tip-and-ring pair. When the phone is on-hook, almost no current flows, so the line voltage stays near the nominal value. The expected reading between the line conductors is about 48 to 52 volts DC. Values outside this range suggest a line fault or abnormal conditions, while voltages much lower (12–36 V) or much higher (60–70 V) are not typical for a normal idle POTS line.

POTS lines are powered by a central office supply that provides a constant DC voltage to the tip-and-ring pair. When the phone is on-hook, almost no current flows, so the line voltage stays near the nominal value. The expected reading between the line conductors is about 48 to 52 volts DC. Values outside this range suggest a line fault or abnormal conditions, while voltages much lower (12–36 V) or much higher (60–70 V) are not typical for a normal idle POTS line.

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