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Distinguished Sage
Distinguished Sage
223 Views
Message 11 of 27

Re: Gradually Reduced Speed?

enter your phone number and post results  remember to delete number  http://dslchecker.bt.com/adsl/adslchecker.welcome

 

this will show estimated range for your line



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Adamsheff
Aspiring Contributor
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Message 12 of 27

Re: Gradually Reduced Speed?

Not sure how this will paste but I’ll give it a go...!

Featured Products Downstream Line Rate(Mbps) Upstream Line Rate(Mbps) Downstream Handback Threshold(Mbps)
High Low High Low
VDSL Range A (Clean) 80 63 20 19 55
VDSL Range B (Impacted) 76.7 51.3 20 17.2 39.8
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Adamsheff
Aspiring Contributor
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Message 13 of 27

Re: Gradually Reduced Speed?

https://imgur.com/a/LadcM

I’ve uploaded a screenshot.

Thanks guys
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FocusTech
Beginner
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Message 14 of 27

Re: Gradually Reduced Speed?

Hey, reading this no one has mentioned contention.

 

Whatever the broadband technology part of the connection will be shared with others.

 

If you have had a recent uptake in the area of people signing up for FTTC then your overall performance may be impacted as contention will have increased.

 

Other factors...

 

At the same time weather (especially damp or wet) can cause problems with the insulation on the cables and cause a drop in speed. In hot weather lines can stretch and also cause problems.

 

Another thing that people also confuse is the speeds.

Connection speeds are measured in Mega Bits Per Seconds not Mega Bytes per second which also leads to confusion.

People expect downloads on an 80 Mbps connection to download 80 MB in 1 seconds, this simply wont happen. Actual speeds would be around 10MB per second.

 

Also i see a lot of variance because Windows10 for example is downloading or uploading (if you have not turned off the update sharing) in the background.

 

And, ISPs only quite "up to" a certain speed.

 

If you truly get the speed you expect then you are lucky.

 

My own connections at work and home can show variance of up to 20% depending on what is happening on the line and at a given time of day.

 

Speedtest.net and the BT Wholesale Speed Tests are simply guides and will only give you a result at that given point in time.

 

Source = years of running an IT and Comms business and spending too much time talking to ISP techs!

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Distinguished Sage
Distinguished Sage
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Message 15 of 27

Re: Gradually Reduced Speed?


@FocusTech wrote:

Hey, reading this no one has mentioned contention.

 

Whatever the broadband technology part of the connection will be shared with others.

 



Download speed is affected by congestion but DSL sync speed isn't.

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FocusTech
Beginner
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Message 16 of 27

Re: Gradually Reduced Speed?

True enough but sync speed will vary every time you connect.
It only represents the possible maximum speed under perfect conditions.
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Sage
Sage
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Message 17 of 27

Re: Gradually Reduced Speed?

@FocusTech there's no contention on FTTC. There may occasionally congestion issues but these are normally fixed pretty quickly retified by BTWholesale.

 

Each FTTC cab is capable of supplying 80Mbps to every connection simultaneously.

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FocusTech
Beginner
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Message 18 of 27

Re: Gradually Reduced Speed?

Partially correct, there is no contention to the cab but there is at the exchange!
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Sage
Sage
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Message 19 of 27

Re: Gradually Reduced Speed?


@FocusTech wrote:
Partially correct, there is no contention to the cab but there is at the exchange!

Again incorrect. As I said there may be congestion occasionally but it is normally rectified pretty quickly by BTWholesale. The backcone has plenty of dark fibre available.

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Adamsheff
Aspiring Contributor
149 Views
Message 20 of 27

Re: Gradually Reduced Speed?

Thanks for the comments guys!

Do the results from the screenshot I attached show that the line could improve? If there’s crosstalk, will that prevent the line from performing well enough to get a 3-5db noise margin?
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