Huawei NE05E Hardware Manual page 235

HUAWEI NE05E,NE08E
Hardware Guide
Number of
discrete
reflectances
greater than –55
dB
6
8
10
3.5.1.5 Optical Attenuator Configuration
This section describes how to configure an optical attenuator.
Calculating the Optical Attenuation
You can calculate the optical attenuation based on the actual optical power.
Table 3-271 Description of the Paramater
Name
P(in)min
P(out)max
S
A
P(in)max
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.
Issue 05 (2023-03-31)
QSFP28 50G-FR
(Maximum value
of each discrete
reflectance)
-38 dB
-40 dB
-41 dB
Copyright © Huawei Technologies Co., Ltd.
3 Hardware Description
QSFP28 50G-LR
(Maximum value
of each discrete
reflectance)
-35 dB
-37 dB
-39 dB
Description
maximum transmit optical power.
transmission distance.
transmission distance.
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.
maximum receive optical power, that
is, minimum overload point.
QSFP28 50G-ER
(Maximum value
of each discrete
reflectance)
-35 dB
-37 dB
-39 dB
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