Huawei NE05E Hardware Manual page 517

HUAWEI NE05E,NE08E
Hardware Guide
fiber and cable quality and the link is more sensitive to multipath reflection
interference of signals. If the fiber link connector, fiber section, or fiber splicing
surface is dirty, optical signals are reflected back and forth on the fiber link,
causing interference due to co-channel noise on the receive side. As a result, the
optical link is unstable or intermittently disconnected.
According to the national standard (GBT50312-2016), the loss of the optical fiber
link connector must meet the requirements described in
Table 4-39 Maximum attenuation of the optical fiber connector
Type
Fiber splicing connector
Optical mechanical connector
Optical connector
Table 4-40
when Ethernet ports (such as 200G and 50G) use PAM4 encoding to double the
rate. More connectors bring lower requirements for the reflection.
Table 4-40 Maximum reflection of connectors
Number of
Optical Fiber
Connectors
1
2
4
6
8
10
Procedure
1.
Issue 05 (2023-03-31)
NO TE
Fiber cores are connected through connectors, such as the ODF, optical attenuator, and
flange, in splicing and mechanical modes.
describes requirements for the reflection of the optical fiber connector
Maximum Reflection of Each Connector (dB)
50GBASE-FR
-25
-31
-35
-38
-40
-41
After the optical fiber at the peer end is disconnected, use the OTDR meter to
test the local end. Check whether the loss and reflection of each link and
node are normal. (The loss of a fiber splicing connector should be less than
0.3 dB, the loss of a connector should be less than 0.75 dB, and the reflection
Copyright © Huawei Technologies Co., Ltd.
4 Hardware Installation and Parts Replacement
Maximum attenuation of an optical fiber
connector (dB)
0.3
0.3
0.75
50GBASE-LR
-22
-29
-33
-35
-37
-39
Table 4-39.
50GBASE-ER
-19
-27
-32
-35
-37
-39
509