A.155kbit/s B.622kbit/s C.1244kbit/s D.2488kbit/s
A.950nm B.1310nm C.1330nm D.1550nm
A.光通道誤碼性能測試 B.備用電路誤碼測試 C.保護倒換檢查 D.網絡優(yōu)化調整