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).
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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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3 S/ R4 L3 W  E9 I' u% `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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2 D8 U' J. n+ A0 W3 x. I) _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).6 ~; n2 d' x' D& o# O# F3 T

6 A3 J+ v9 x7 q, w* V4 T* aIn 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).# K1 e% p! O+ S
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In 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 :
9 D. m: Z$ g4 }& T z. MRinger equivalence number ?' K6 q9 P' a0 y) H `2 K
http://en.wikipedia.org/wiki/Ringer_equivalence_number
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& f$ L0 g0 y2 x+ BIn 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).
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# z! c# o* }& v; p.......

1 Y6 X) G7 e8 U0 Y7 w2 W# S# a$ u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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