首頁 > 通訊電纜
[問題求助] IEC 61156-5 為什么找不到NEXT標(biāo)準(zhǔn)公式?
P:2012-10-31 09:06:06
3
原文如下：
The worst pair power sum near-end crosstalk, PS NEXT, at all frequencies, f, in the frequency range indicated inTable 6 shall not be less than the value abtained from Equation (6) useing
PS NEXT(f)=PS NEXT(1)-15*log10(f) (6)
For those frequencies where the calculated value of PS NEXT is greater than 75 dB,the requirement shall be 75 dB.
The minimum pair-to-pair NEXT for any pair combination shall be at least 3 dB better than the PS NEXT for any pair.
PSTACSR - prestressed thermostable aluminium conductor steel reinforced預(yù)應(yīng)力耐熱鋼芯鋁絞線 （0） 投訴
3
你需要登錄才能發(fā)表，點(diǎn)擊登錄。