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Distinguished Sage
Distinguished Sage
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Message 11 of 21

Re: Ambient temp affects noise margin

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Max data rate is just a theoretical rate calculated from the various parameters on a continuous basis and thus will vary continually. Actual speed will only change when a re-sync occurs.

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DavidCo
Expert
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Message 12 of 21

Re: Ambient temp affects noise margin

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OK, I got all that and still have my 'Subject'

I actually have a log that I created that 'plots' Data rate vs Temp'

Only another month or so of re-syncing then.

Ho-hum

David

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Distinguished Guru
Distinguished Guru
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Message 13 of 21

Re: Ambient temp affects noise margin

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@DavidCo wrote:

OK, I got all that and still have my 'Subject'

I actually have a log that I created that 'plots' Data rate vs Temp'

Only another month or so of re-syncing then.

Ho-hum

David


Except ambient temp should not cause a re-sync unless the Hub is overheating.

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DavidCo
Expert
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Message 14 of 21

Re: Ambient temp affects noise margin

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@pippincp

This morning I took note of the stats of the HH6.

I then dropped in my TP-Link VR900 v2

Noise margin from the HH6 = 2.6

Noise margin from TP-Link = 3.4

This has held for 3 hrs

I think you are right!

 

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DavidCo
Expert
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Message 15 of 21

Re: Ambient temp affects noise margin

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All bets are now off.

DSL was down between 05.00 - 08.45. I had done all the usual before phoning BT when it came back.

My stats are all over the place.

Download has dropped to 42Mb and the noise margin is fluctuating between 4 & 6dB 

Perhaps it was ot the Hub after all, I'll have to waut and see.

 

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Stuey3d
Expert
392 Views
Message 16 of 21

Re: Ambient temp affects noise margin

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This is a phenomenon I have experienced year on year without fail, in the winter my connection is anywhere upto 5Mb faster than it is in the summer. 

 

Heat can effect conductivity of the cabling but it would be slight, however the street cabinets wont be liking the heat much either and I suspect them getting warm is causing them to struggle a bit and maybe throttle slightly.

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DavidCo
Expert
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Message 17 of 21

Re: Ambient temp affects noise margin

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Thank you, I never thought of that.

Just as an experiment, I went to the cabinet and whished I had not touched it.

I guess I had assumed that being FTTC there would not be a problem.

Assuming the current behaviour is my final speed etc I will have the same stats as before the update/upgrade G.INP 3dB.

Wonderfull especially as BT increase the cost.

David

 

 

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DavidCo
Expert
345 Views
Message 18 of 21

Re: Ambient temp affects noise margin

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I've given the darn thing time settle down and am puzzled!
My down stream sync is now 44.87. The noise margin fluctuates between 2.5/4.5 - Why!
My IP profile is now 41.23 (BT wholesale)
The above gives a ratio of what?
OR have been installing some new gear just up the road for a new estate (small) That area had a cabinet (Cu)
They have run fibre from the FTTC area that I'm off across the road (away from me)
Straight to a new 'Combi', then they have added a 'Pod' to the old cabinet (Cu)
Could I be looking at a capacity issue?
 
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Distinguished Guru
Distinguished Guru
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Message 19 of 21

Re: Ambient temp affects noise margin

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Capacity at the cab would have no impact on speeds or noise margin. Even at maximum capacity the cab is capable of 80Mb to every line. Loss occurs over the line length. The pod is most likely a G.Fast pod for those within 500mtrs giving speeds up to 330Mbps.

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Highlighted
DavidCo
Expert
324 Views
Message 20 of 21

Re: Ambient temp affects noise margin

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So it must be something else.

There has  not been any change in/on the property.

Why have I lost over 10% speed.

Why is my noise margin screwy.

 

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