P(in)min: worst sensitivity, that is,
maximum value of the worst
sensitivity.
P(out)max: maximum transmit optical
power.
S: transmission distance.
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.
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 1-1671 Reference for configuring an attenuator
eSFP,1310nm,STM1
,LC,SM,15km
If P(in)max of an optical module equals P(out)max, you do not need to configure an attenuator.
You can choose the 5 dBm and 10 dBm attenuators for optical modules on the device.
BOM Number and Description of Attenuators
Table 1-1672 BOM number and description of attenuators
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