The FCC decreed that the subscriber would be responsible for the 'load' their CPE (Customer Provided Equipment) devices put on their phone line. Some guidelines were established;
Typical phone lines have 85 to 105 Volts A.C. superimposed on a nominal -48 Volts D.C. The A.C. current during the ringing cycle is between 20 and 50 milliamps. It will give you a shock!
A similar system exists in Canada, the REN is expressed as a whole number, and the total of all RENs cannot exceed 100.
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