Huawei NE40E Hardware Description page 891

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Hardware Description

P(in)min: worst sensitivity, that is,

maximum value of the worst

sensitivity.

P(out)max: maximum transmit optical

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

BOM Number and Description of Attenuators

Table 1-1672 BOM number and description of attenuators

Issue 01 (2018-05-03)

eSFP,1310nm,STM1

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.

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