Huawei NE05E Hardware Manual page 321

HUAWEI NE05E,NE08E
Hardware Guide
Item
NOTE
3.5.15 AE 905S Module
Description
Existing core network devices, which do not support 1588, cannot obtain clock
signals from BITS servers. Upgrading core network devices to support 1588 is both
complex and costly. To address this issue, the AE 905S module is developed. After
having an AE 905S module equipped, the device will be able to support 1588v2.
Figure1
Figure 3-77 AE 905S module (front view)
Issue 05 (2023-03-31)
The optical power calculation is based on the OMA value. If the module needs to reach the
nominal data, the board FEC function must be enabled.
The optical power read by the device is the average optical power, not the OMA optical
power.
1. To keep the optical module running stably for a long time, set the receive optical power
less than -4 dBm. (According to IEEE 802.3, if the receive optical power exceeds -2.3 dBm,
the optical module may be permanently damaged.)
2. Before connecting the optical module, you are advised to use the optical power meter to
measure the receive optical power (P). If P is less than -4 dBm, the optical module can be
directly connected. If P is greater than -4 dBm, add an appropriate attenuator at the receive
end to ensure that P is less than -4 dBm. Alternatively, add an appropriate attenuator (the
recommended value is no less than 10 dB) before the optical module is connected, and
then adjust the attenuator according to the actual situation to prevent the module from
being damaged.
3. If the pigtail loopback or short-distance connection of the optical module is used, the
attenuator must be added. It is recommended that the attenuator be greater than or equal
to 10 dB.
4. When this type of optical module is used to interconnect with a WDM device, the 1+1
protection switching duration on the client side of the WDM device is longer than 50 ms.
and Figure2 illustrate the appearance of an AE 905S module.
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