C-BAND optical booster unit (MAX -3dBm IN and 20dBm OUT, Gain 23 dB), apply to Huawei OSN6800 and OSN8800. The total wavelengths range from 1529 nm to 1561 nm. Can be substituted by TN13OBU103 without any software upgrade. Supports the system to transmit services over different fiber spans without electrical regeneration. Provides an in-service monitoring port (MON). Supports the gain locking and power locking modes. The EDFA inside the board has the transient control function. Detects and reports the optical power. Monitors the temperature of the pump laser. Detects the pump driving current, back facet current, pump cooling current. Detects temperature of the pump laser and the ambient temperature of the board. Supports Optical-layer ASON. TN12OBU103 is a WDM optical booster board applied to Huawei OSN6800 and OSN8800, to amplify C band optical signals at Gain Range 23±1.5dB