1> Insert Loss:
         ≤0.3dB
    2> Retern Loss:
         PC ≤-45 dB;
         UPC≤-50 dB;
         APC≤-60dB
    3> Working Temperature: -25 ℃-- + 55℃
    4> Oscillating Test : ≤0.1db (5-50HZ)