FCC PART68 number 中的REN 是什么意思

茶馆 · 发表于 2011-4-28 12:07

请问一下FCC part 68 number 中的REN 是什么意思，代表什么参数

H-RH · 发表于 2011-4-28 13:34

Ringer equivalence number
http://en.wikipedia.org/wiki/Ringer_equivalence_number

In telecommunication, a ringer equivalence number (REN) is a somewhat arbitrary number which denotes the electrical load a telephone ringer has on the line. In the U.S., this is determined in accordance with ANSI/TIA-968-B (August 2009).( {: z5 W: q& T. W/ B
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REN is a United States-developed yardstick, but analogous systems exist internationally. In some countries, (particularly in Commonwealth nations), the REN is better known as the ringer approximated loading number (RAL).
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In the United Kingdom it is called the ringer equivalence number and a maximum of 4 is allowed on any British Telecom (BT) line.
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In Canada it is called a Load Number (LN); which cannot exceed 100. (The LN of each device represents the percentage of total load allowed).
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In the United States 1 REN was formerly equivalent to a 6930Ω 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 7000Ω at 20Hz (type A), or 8000Ω from 15Hz to 68Hz (type B).
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7 I& d5 K$ t, n. A+ g3 Q* Q6 RIn Europe 1 REN used to be equivalent to an 1800Ω resistor in series with a 1 µF capacitor. The latest ETSI specification (2003-09) calls for 1 REN to be greater than 16 kΩ at 25 Hz and 50 Hz.

茶馆 · 发表于 2011-4-28 13:50

引用第1楼H-RH于2011-04-28 13:34发表的 :
/ b- H8 _" c$ p' o+ G' I- l- URinger equivalence number6 f. {" _) Z2 q3 g2 J! |: g: y
http://en.wikipedia.org/wiki/Ringer_equivalence_number5 f6 Q0 m' r0 j% j: R: K$ U% W

- P6 U( ?2 r. M/ V' F" HIn telecommunication, a ringer equivalence number (REN) is a somewhat arbitrary number which denotes the electrical load a telephone ringer has on the line. In the U.S., this is determined in accordance with ANSI/TIA-968-B (August 2009).2 G# C+ ?' Q' T" Y! N
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.......

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谢谢H-RH.

b122741814 · 发表于 2011-4-28 22:21

楼上说的很清楚了
谢谢

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