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Ringer equivalence number
The ringer equivalence number (REN) is a telecommunications measure that represents the electrical loading effect of a telephone ringer on a telephone line. In the United States, the REN was first defined by U.S. Code of Federal Regulations, Title 47, Part 68, based on the load that a standard Bell System model 500 telephone represented, and was later determined in accordance with ANSI/TIA-968-B (August 2009).
Although the REN was developed in the United States, analogous measurement systems exist internationally. In some countries, particularly in Commonwealth nations, the REN is also known as the ringer approximated loading number (RAL).
==Definition==
A ringer equivalency number of 1 represents the loading effect of a single traditional telephone ringing circuit, such as that within the Western Electric model 500 telephone. The REN of modern telephone equipment may be significantly lower than 1. For example, externally powered digital-ring telephones may have a REN as low as 0.1, while modern analog-ring telephones, in which the ringer is powered from the telephone line, typically have a REN of approximately 0.8.
In the United States, the FCC Part 68 specification defined 1 REN as equivalent to a 6930 Ω resistor in series with an 8 µF (microfarad) capacitor. The modern ANSI/TIA-968-B specification (August 2009) defines 1 REN as an impedance of at (type A ringer), or from 15 Hz to 68 Hz (type B ringer).
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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