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Andrew79
Beginner
1,111 Views
Message 1 of 5

gfast speed dropping off and SNR going up

Hi All

Bit of a puzzling thing going on with my BB.

I had Gfast installed in January this year and it has been great at around 125mbit down and 16 up until about 2 or 3 weeks ago. SNR was at 3dB down and up.

Now, every few days, my Smarthub 2 resyncs over night and a bit of downstream speed drops off, whilst the SNR has gone up by 1dB each time, so 4dB, 5dB, 6dB, 7dB and now 8dB after the latest resync last night.

Now it's synced up as below, not much better than the FTTC it replaced! (In fact the upsteam is worse as I had the full 80/20 on FTTC)

Firmware version:v0.17.01.12301-BT
 

Firmware updated:Sat Mar 21 19:26:56 2020

Board version:R01

GUI version:1.56 15_02_2019

DSL uptime:0 days,22 Hours10 Mins22 Secs
 
Data rate:14.937 Mbps / 87.576 Mbps
 

Maximum data rate:14.557 Mbps / 85.295 Mbps

Noise margin:3.1 / 8.1

Line attenuation:0.0 / 43.0

Signal attenuation:0.0 / 43.0

Upstream error control:Off
 

Downstream error control:Off

I work in IT so have tried all the usual stuff like factory reset/turning it off and on again etc. The router itself is plugged straight into the master socket, and there is no noise on the line when doing the quiet line test.

Is this DLM going a bit crazy? I could be wrong but pretty sure all this coincided with when my router did a firmware upgrade. Don't think there is an issue with the line, the error control has remained off.

Has anyone seen this before? I wonder how low it will go?!

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4 REPLIES 4
pippincp
Distinguished Sage
1,102 Views
Message 2 of 5

Re: gfast speed dropping off and SNR going up

Stop rebooting the router you will only make things worse. Is there any noise on the line? 17070 option 2, best with corded phone.

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wenklaw
Aspiring Expert
1,090 Views
Message 3 of 5

Re: gfast speed dropping off and SNR going up

There is a 100meg download speed guarantee on ultra fast products including g.fast so you need to report it.

I have g.fast and get the full 330 sync but noticed when I changed the rj11 cable from the master socket to my router the max data rate shot up by 40meg.  Changed it for an RJ45 to RJ11 cat6 cable.  Been stable for 10 months approx, little fluctuation in max sync rates

Data rate:49.111 Mbps / 329.375 Mbps
 

 

Maximum data rate:73.051 Mbps / 612.581 Mbps
 

 

Noise margin:10.4 / 17.5

 

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Andrew79
Beginner
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Message 4 of 5

Re: gfast speed dropping off and SNR going up

I will report it as  fault I think.

I haven't been rebooting my router (apart from once) as it just re-syncs on its own. I already have done the quiet line test and that's all good.

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pippincp
Distinguished Sage
1,040 Views
Message 5 of 5

Re: gfast speed dropping off and SNR going up

That's not the impression you gave in you OP but never mind. Give the FTTP team a ring, they deal with G.Fast issues.

0800 587 4787

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