attenuator at the receive end to ensure that the receive optical power is less
than -4 dB. Alternatively, add an optical attenuator (no less than 10 dB is
recommended) before the interconnection, and then adjust the optical
attenuator based on the site requirements to prevent the optical module from
being damaged.
3. If a loopback occurs on the pigtail of the optical module or the optical
module is connected for a short distance, an optical attenuator must be
added. It is recommended that the optical attenuator be no less than 10 dB.
4.2.11 Maintenance of the device
4.2.11.1 Basic Operation Process and Precautions
Context
To ensure that the device provides uninterrupted communication services for users
in networks, parts of a device are replaced mostly when the power is on.
Therefore, to ensure safe operation of a device and to minimize the impact of
parts replacement on services, maintenance personnel must strictly abide by the
basic operation process regulated in the manual, as shown in Figure 4-271.
HUAWEI NetEngine 8000 F
Hardware Guide 4 Hardware Installation and Parts Replacement
Issue 05 (2023-03-31) Copyright © Huawei Technologies Co., Ltd. 623
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