中華電信進來光纖只用一芯
其實這一條 細光纜 裡面有二芯光纖絲
就像很多人以為中華電信供裝拉的那一條電話線裡面只有二芯銅線 事實上是四芯銅線
目前 純網路訊號的PON 都是只吃一芯光纖絲 來跑網路訊號
下行(從機房端或路邊交接箱-->用戶端) 的光波長是走1490nm
上行(從用戶端-->機房端或路邊交接箱) 的光波長是走1310nm
不同波長所以只要吃一芯光纖絲即可,不會插錯
一般 switch to switch 用兩芯是因為價差
一個單芯雙波長(1310nm, 1490nm)的光纖收發模組 > 一個單芯單波長(1310nm)的光纖收發模組+一個單芯單波長(1310nm)的光纖收發模組 還貴
迴響
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