The REN is used to determine the number of devices that may be connected to a telephone line.

[DreamMaster]

Добрый лень!
Подскажите, пожалуйста,что такое REN (Ringer Equivalency Number)?

Контекст:

The REN is used to determine the number of devices that may be connected to a telephone line. Excessive RENs on a telephone line may result in the devices not ringing in response to an incoming call. In most but not all locations, the sum of RENs should not exceed five (5.0). To be certain of the number of devices that may be connected to a line, as determined by the total RENs, contact the local telephone company.

[DreamMaster]

Заранее благодарен. :)