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Too Low Incoming Optical ...

Too Low Incoming Optical Signal on 40GE link

Created: Oct 29, 2021 16:01:06Latest reply: Oct 30, 2021 00:58:20 144 3 0 0 0
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Hello everyone.

We have a long (40 km) distance link between 2 Sites A and B with CE6881 switches, connected by 40GBASE_ER4 transceivers.

On Site B we see too low incoming signal value just only on Lane0:

!

Current RX Power (dBm)   :-40.00|-19.43(Lane0|Lane1)

                                          -19.28|-17.06(Lane2|Lane3)


On Site A incoming signal is good:

!

 Current RX Power (dBm)  :-19.83|-18.89(Lane0|Lane1)

                                          -18.04|-16.35(Lane2|Lane3)


Tx Power on both Sites is identical, but :

!

Current TX Power (dBm)   :-1.46|-0.80  (Lane0|Lane1)

                                          -1.16|-0.85  (Lane2|Lane3)


What's the problem - optical cable or transceiver? 

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jason_hu
Admin Created Oct 30, 2021 00:58:20

Hi friend!

Transceiver-power-low

If the transmit optical power is too low, you are advised to replace the local optical module.

If the receive optical power is too low, you are advised to replace the peer optical module.

If the fault is not rectified, check the links.


Hope to help you!


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korobkinaa
korobkinaa Created Nov 1, 2021 14:57:06 (0) (0)
Hello.
Replacement of the transceiver didn't solve problem.
What exactly to check with links?  
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ariase88
ariase88 Admin Created Oct 29, 2021 16:31:07

Thanks for contacting the Huawei community!

We are checking your question and will provide an answer to you shortly...
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jason_hu
jason_hu Admin Created Oct 30, 2021 00:58:20

Hi friend!

Transceiver-power-low

If the transmit optical power is too low, you are advised to replace the local optical module.

If the receive optical power is too low, you are advised to replace the peer optical module.

If the fault is not rectified, check the links.


Hope to help you!


View more
  • x
  • convention：

korobkinaa
korobkinaa Created Nov 1, 2021 14:57:06 (0) (0)
Hello.
Replacement of the transceiver didn't solve problem.
What exactly to check with links?  
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