Method used to obtain the attenuation of the optical cable between two sites based on optical power

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You can calculate the attenuation roughly using the following formula:
Attenuation of the optical cable between two sites = (Transmit optical power of the OA board at the transmit-end site �?Receive optical power of the OA board at the receive-end site) �?Insertion loss of the FIU boards at both ends

Other related questions:
Method used to calculate the optical cable attenuation between WDM equipment
The attenuation of an optical cable between WDM equipment can be calculated using the following formula: Optical cable attenuation = Difference between the transmit optical power of one OA board and the receive optical power of the peer OA board �?(Insertion loss of the two FIU boards in the middle + Attenuation of the optical attenuator)

Method used to query optical power
In the NE Explorer, select the desired board. Choose Configuration > Optical Power Management from the navigation tree.

Method used to convert between the optical power of multiplexed wavelengths and optical power of single wavelengths of an OA board
The relationship between the optical power of multiplexed wavelengths and optical power of single wavelengths of an OA board is as follows: Optical power of multiplexed-wavelength signals = Optical power of single-wavelength signals + 10lgN where N is the number of wavelengths for multiplexed-wavelength signals.

Specifications of fixed optical attenuators
Fixed optical attenuators are available with the following specifications: 3 dB, 5 dB, 7 dB, and 10 dB.

Method used to query the optical power of the OBU board
Right-click the OBU board on the NMS and choose Query Optical Power from the shortcut menu that is displayed.

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