착신 벨 등가 번호
Ringer Equivalence Number (REN), a measure used in telecommunications to indicate the electrical load a piece of customer-premises equipment (CPE) places on a telephone line, determining how many devices can be connected without affecting ringing functionality.
예문:
"Before purchasing a new fax machine, check its REN value to ensure it won't overload your phone line."
"Most residential phone lines can support a total REN of 5, meaning you must calculate the sum of all connected devices."
"If the total REN exceeds the limit set by the telephone company, the phones may not ring properly."