You can calculate the optical attenuation based on the actual optical power.
The principle for determining whether an attenuator needs to be configured at a transmission point is as follows:
If P(out)max – S x Attenuation coefficient > P(in)max, an attenuator needs to be configured.
The optical attenuation is calculated in the following formula: T= P(out)max – S x Attenuation coefficient – P(in)max.
Table 1 Description of the Paramater
|P(in)min||maximum transmit optical power.|
|A||attenuation coefficient. Note that the attenuation coefficient is related to optical fiber types and wavelengths. By default, the attenuation coefficient of a 1310-nm wavelength in a G.652 fiber is 0.45 dBm/km or 0.4 dBm/km; the attenuation coefficient of a 1550-nm wavelength in a G.652 fiber is 0.235 dBm/km or 0.25 dBm/km.|
|P(in)max||maximum receive optical power, that is, minimum overload point.|
Table 2 Reference for configuring an attenuator:
|34060276||eSFP,1310nm,STM1,LC,SM,15km||-8 dBm||-15 dBm||-31 dBm||-8 dBm|