Ringer Equivalency Number (REN) is a number determined in accordance with the U.S. Code of Federal Regulations, Title 47, part 68, which represents the ringer loading effect on a line. A REN of 1 represents the loading effect of a single traditional telephone set ringing circuit. Modern telephone sets may have a REN lower than 1. Depending on the applicable Telecom standards in use within a given location, different REN units are used. When referring to a telephone set, subscriber’s equipment or a Ring Generator’s REN, the relevant Telecom standard should be identified.
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