福祿克網(wǎng)絡(luò):ACR-F取代ELFEXT
2008年6月,福祿克網(wǎng)絡(luò)在ANSI/TIA-568-C.2?中采用了與歐洲標(biāo)準(zhǔn)和國(guó)際標(biāo)準(zhǔn)一樣的新參數(shù)ACR-F。ACR-F是一個(gè)叫做:衰減遠(yuǎn)端串?dāng)_比。
ACR-F是一個(gè)計(jì)算結(jié)果,而不是測(cè)量值。它是通過(guò)兩條相鄰線對(duì)減去遠(yuǎn)端串?dāng)_(FEXT)衰減的信號(hào)得出的值。長(zhǎng)度不一樣結(jié)果也會(huì)不一樣。使用同樣材料和做工的兩條鏈路衰減和FEXT會(huì)不一樣,因?yàn)殚L(zhǎng)度不一樣。
舉個(gè)栗子:50M鏈路標(biāo)準(zhǔn):
FEXT(遠(yuǎn)端串?dāng)_) =?45?dB
Insertion?Loss(插入損耗) =?11?dB
ACR-F (遠(yuǎn)端衰減串?dāng)_比)=?45?-?11?=?34?dB
另外一種方法去理解ACR-F就是,認(rèn)為是遠(yuǎn)端的ACR-F。和下面的圖片一樣。
結(jié)論說(shuō)明(用英文原文)
Compare?the?results?of?measurements?made?from?both?ends?of?the?link?to?the?appropriate?ISO?or?TIA?limits.?There?are?12?ACR-F?measurements?made?from?each?end,?for?a?total?of?24.?This?is?because?the?Insertion?Loss?can?vary?slightly?depending?upon?which?pair?is?energized.?So?as?an?example,?the?field?tester?will?energize?Pair?1?and?listen?on?Pair?2?at?the?far?end.?Then?it?will?energize?Pair?2?and?listen?on?Pair?1?at?the?far?end.
ACR-F?that?is?too?high?is?indicative?of?either?excessive?Insertion?Loss,?higher?than?expected?FEXT,?or?both.
本文關(guān)鍵字: ACR-F, elfext
原創(chuàng)標(biāo)題:福祿克網(wǎng)絡(luò):ACR-F取代ELFEXT
原文鏈接:http://qqmmqq.cn/archives/acr-replace-elfext.html
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