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dombullion
Aspiring Expert
2,438 Views
Message 1 of 10

Maximum data rate

Good Evening, 

 

We recently had a VDSL connection installed to upgrade our speeds from 6mb to around 15mbps on a good day. 

BT Wholesale says the IP Profile is 14.12mbps but the maximum data rate on the hub stats is much higher. Could someone help with this please. 

 

And just to say its good to be back on the forums again. 

 

Kind regards, 

Dominic

 

Here are the stats:

5. VDSL uptime:3 days, 13:25:37
6. Data rate:1296 / 14583
7. Maximum data rate:1629 / 23612
8. Noise margin:6.2 / 6.2
9. Line attenuation:0.0 / 31.4
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9 REPLIES 9
Sage
Sage
2,394 Views
Message 2 of 10

Re: Maximum data rate

Once you add overheads to your 14.12 Mbps you are close to the max data throughput.

 

Offhand I can't remember the %'s but I think it is in the region of 98% of max is what you get.

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conrad
Recognised Expert
2,373 Views
Message 3 of 10

Re: Maximum data rate

I believe dombullion is referring to the Maximum data rate of 1629/23612 not the data rate of 1296/14583 which is considerably lower. (I don't  have an answerSmiley Sad)

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Stuey3d
Expert
2,348 Views
Message 4 of 10

Re: Maximum data rate

Maximum Attainable rate is the maximum rate your line can support without error correction and other stuff DLM does to make sure your line is stable.

 

It appears that your line may be succeptable to interference and therefore DLM has slowed the Sync Rate down so that it maintains a stable connection. BT I believe gives you your estimate based on these factors.

 

Max Attainable is always changing as well, if you look at it early hours of the morning it will be far higher than if you look at it around 1900 when every man and his dog surfs the net.

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dombullion
Aspiring Expert
2,318 Views
Message 5 of 10

Re: Maximum data rate

how do my stats look. could i be getting faster speeds?

 

 VDSL uptime:4 days, 07:07:57
6. Data rate:1296 / 14583
7. Maximum data rate:1691 / 23990
8. Noise margin:6.4 / 6.3
9. Line attenuation:0.0 / 31.4
10. Signal attenuation:0.0 / 25.5
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Stuey3d
Expert
2,283 Views
Message 6 of 10

Re: Maximum data rate


@dombullion wrote:

how do my stats look. could i be getting faster speeds?

 

 VDSL uptime:4 days, 07:07:57
6. Data rate:1296 / 14583
7. Maximum data rate:1691 / 23990
8. Noise margin:6.4 / 6.3
9. Line attenuation:0.0 / 31.4
10. Signal attenuation:0.0 / 25.5

No it looks like you are getting the best speed, your Noise Margin is near 6db which is the minumum the connection likes to be at, it appears that DLM is doing its job right.

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dombullion
Aspiring Expert
2,265 Views
Message 7 of 10

Re: Maximum data rate

Ok,

 

that's good then. 

 

Thanks for your help

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xCyanideee
Beginner
1,657 Views
Message 8 of 10

Re: Maximum data rate

How often does the  DLM recalculate the maximum data rate?

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Distinguished Sage
Distinguished Sage
1,647 Views
Message 9 of 10

Re: Maximum data rate


@xCyanideee wrote:

How often does the  DLM recalculate the maximum data rate?


It changes itself, as line conditions change. Nothing to do with DLM.

 

It will tend to reduce during the evening when interference levels are higher.

 

Crosstalk from other circuits will also reduce the rate.

 

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Distinguished Sage
Distinguished Sage
1,626 Views
Message 10 of 10

Re: Maximum data rate

it you check your router stats you will probably notice the max data rate fluctuating all the time, normally samll amounts, and at same time you will probably notice your noise margin fluctuating and again very small changes - 0.1/.2db



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