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[tomtom]

Hi, My line has been capped to 0.8mbit upload. It never goes any higher on a resync. It used to sync at 1.2 -1.3mbit with attainable being 1.7mbit upload.

Is this caused by RFI/EMI noise source rather than crosstalk or a damaged phone line?

Will the cap be removed if the noise source disappears or does it need to be reset by an engineer?

Thanks

[tubaman]

Do you have any line stats we can look at please as it'll greatly help to work out what's happening.
 

[tomtom]

Hi yes, here are some line stats:

[tomtom]

More line stats

[tomtom]

Here are some SNRM graphs, U0 shows snrm fluctuating. Im not sure what noise source could cause interference at those frequencies?

[burakkucat]

As we can see, the US0 band is significantly degraded. The question is "Why?".

Do you have a telephone connected to the circuit? If yes, is there any audible noise? (Establish a call to 17070 and take the relevant option.)

I have a (slight) suspicion that you may be experiencing a joint beginning to show high resistance (HR) and/or semi-conductive tendencies.

[tubaman]

In addition to burakkucat's diagnosis, the fact that it syncs at exactly 800Mbps, albeit at 6dB SNR, does suggest it is banded at that rate. It may well need a DLM reset to resolve that, but the underlying cause needs to be addressed first.
 

[tomtom]

As we can see, the US0 band is significantly degraded. The question is "Why?".

Do you have a telephone connected to the circuit? If yes, is there any audible noise? (Establish a call to 17070 and take the relevant option.)

I have a (slight) suspicion that you may be experiencing a joint beginning to show high resistance (HR) and/or semi-conductive tendencies.

Hi, there is no telephone connected at present. I will plug one in and check for any line noise. I think its possible for a joint to be bad since that was the fault last time and a section of the phoneline is aluminium.

[burakkucat]

I think its possible for a joint to be bad since that was the fault last time and a section of the phoneline is aluminium.

Ah, so my slight suspicion has now become a strong suspicion.