Hello Experts.
What could be the reason for extremely low uplink speed in FTTH?
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Several possible reasons:
- Signal issues
- Network congestion
- Equipment configuration
- Limitation on the service plan
- Electromagnetic interference
- Issues in the provider’s network
- Final user equipment
- Malicious software
- Hardware limitations
- Folds in the fiber
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Also:
- The number of the users against the package
- Link distance to the customer
- Signal should be between 18 to 20 dB
- Take a speed test over a laptop, if the speed package 100 MB and the speed test show 70 MB this means link OK and speed package ok
- Package rules from the operator
- Modem itself
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Electromagnetic interference? 
Also, check your device setting, any speed limitation?
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It is less common, but electromagnetic interference can affect the electrical components that convert the optical signal in electrical signal.
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FTTH issue mostly related to configuration changes at operator end.
How about DL speed?
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Also:
- Maybe wrong config from the Core side for UL AMBR.
I can see that you are testing using laptop. Certain applications that work in the background might be using uplink bandwidth without your knowledge. Try make speed test using mobile phone.
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