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Standard User ploddo
(learned) Mon 10-Oct-16 18:30:14
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Upstream attenuation


[link to this post]
 
Is there any particular reason why the line attenuation on the upstream has changed?
Connection speed has also dropped from 52 and is currently 44
Speed is around 36 down and 7 up - down can be anything from 26 - 42 up is always around 7
Modem has been disconnected today for around 2 hours but this didn't change the up attenuation when reconnected.
I have a BT Infinity 1 package, installed in July.


11-09-16 DSL Link Downstream Upstream
Connection Speed 52.51 Mbps 8.06 Mbps
Line Attenuation 22.30 dB 23.70 dB
Noise Margin 6.00 dB 6.30 dB

DSL Link Downstream Upstream
16-09-16 Connection Speed 49.00 Mbps 8.07 Mbps
Line Attenuation 22.50 dB 24.10 dB
Noise Margin 7.30 dB 6.90 dB

29-09-16 DSL Link Downstream Upstream
Connection Speed 44.00 Mbps 8.21 Mbps
Line Attenuation 22.20 dB 34.90 dB
Noise Margin 9.90 dB 5.90 dB

10-10-16 DSL Link Downstream Upstream
Connection Speed 44.00 Mbps 7.98 Mbps
Line Attenuation 22.50 dB 34.70 dB
Noise Margin 9.50 dB 6.10 dB
Standard User RobertoS
(elder) Mon 10-Oct-16 18:37:27
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Re: Upstream attenuation


[re: ploddo] [link to this post]
 
I can't answer your question, but consider readers also need to be aware of your previous thread.

I believe the two threads are closely connected and the information the information in that thread relevant.

It does appear to me from the seemingly fixed 44Mpps and high noise margin that DLM may have applied banding. That doesn't explain what is happening re the attenuation. It is the system trying to cope with whatever is going on.

Kindness isn't going to cure the world of all its awfulness but it's a good place to begin. Daisy Ridley.
My broadband basic info/help site - www.robertos.me.uk. Domains, site and mail hosting - Tsohost.
Connection - AAISP Home::1 80/20. Sync 57825/13835kbps @ 600m. - BQM

Edited by RobertoS (Mon 10-Oct-16 18:39:34)

Standard User BatBoy
(sensei) Mon 10-Oct-16 18:42:34
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Re: Upstream attenuation


[re: RobertoS] [link to this post]
 
So last time it happened it was fixed by rebooting the router?


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Administrator MrSaffron
(staff) Mon 10-Oct-16 18:59:28
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Re: Upstream attenuation


[re: BatBoy] [link to this post]
 
If rebooting a modem fixes an odd attenuation figure, then probably a firmware bug in the modem

The author of the above post is a thinkbroadband staff member. It may not constitute an official statement on behalf of thinkbroadband.
Standard User ploddo
(learned) Tue 11-Oct-16 06:51:05
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Re: Upstream attenuation


[re: MrSaffron] [link to this post]
 
Yes did seem to fix it when rebooted. But not this time.
I've been using this modem for about 8 months, first with Plusnet then with BT. I did try putting the HH5
On but couldn't find the attenuation information on that hub
Seems that the connection speed has dropped when the attenuation has risen too but maybe that's my imagination. The fibre was only connected at my cabinet in July and I was the first property on it. Might it be crosstalk that has suddenly (seemingly) affected the speed?
Standard User BatBoy
(sensei) Tue 11-Oct-16 08:22:23
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Re: Upstream attenuation


[re: ploddo] [link to this post]
 
Crosstalk increases noise which reduces SNRM, so I don't think it's that. The changing attenuation is more likely to be a line fault or a modem fault.
Standard User RobertoS
(elder) Tue 11-Oct-16 08:46:22
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Re: Upstream attenuation


[re: ploddo] [link to this post]
 
Attenuation is a measure of signal loss. More signal loss = Less signal, which will give lower speed.

Kindness isn't going to cure the world of all its awfulness but it's a good place to begin. Daisy Ridley.
My broadband basic info/help site - www.robertos.me.uk. Domains, site and mail hosting - Tsohost.
Connection - AAISP Home::1 80/20. Sync 57825/13835kbps @ 600m. - BQM

Edited by RobertoS (Tue 11-Oct-16 08:47:41)

Standard User ploddo
(learned) Tue 11-Oct-16 10:54:43
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Re: Upstream attenuation


[re: RobertoS] [link to this post]
 
I've posted on the Netgear forum to see if anyone knows of a problem.
Will post here if anything comes to light.
Standard User BatBoy
(sensei) Tue 11-Oct-16 11:06:29
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Re: Upstream attenuation


[re: ploddo] [link to this post]
 
Does the HH5 sync at the same upstream speed? That would indicate a line fault.
Standard User ploddo
(regular) Tue 11-Oct-16 14:07:32
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Re: Upstream attenuation


[re: BatBoy] [link to this post]
 
I've put the HH5 back on - these are the stats:

4. Board version: BT Hub 5A
5. DSL uptime: 0 days, 00:02:06
6. Data rate: 8064 / 42101
7. Maximum data rate: 8064 / 52458
8. Noise margin: 6.0 / 9.6
9. Line attenuation: 34.3 / 22.3
10. Signal attenuation: 35.0 / 20.5
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