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springett
Contributor
838 Views
Message 1 of 6

Slow upload speed

Hi. We recently had Infinity installed (a month or two ago) and the speeds weren't what they were meant to be. BT sent an engineer out last week. The engineer did a lot of cable management and sorted out our terrible master socket. Since then, our download speeds are hitting what they're meant to be.

 

The problem is the upload speed is barely 1Mb, which is lower than what it was before the engineer came and also outside of the range that the DSL checker says we can receive. I asked the engineer if what he was doing would sort the upload speed out and make it faster as it was already quite slow (slower than when we weren't even on fibre) and he seemed quite sure it would. I had to go out before he finished so I didn't get to check it until later when he was gone.

 

Is there anything that can be done to increase my upload speed? I do quite a lot of work at home which needs a faster upload speed than this.  

 




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5 REPLIES 5
springett
Contributor
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Message 2 of 6

Re: Slow upload speed

Considering I never got a reply to this, I guess I'll ask in a clearer way. Is it possible to be receiving a downstream service from within the CLEAN range, and an upstream service from the lowest end of the IMPACTED range? Surely they're the same line, why are they so different for me? 

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imjolly
Distinguished Sage
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Message 3 of 6

Re: Slow upload speed

Both up and down speeds look like they fall in 'B' impacted

 

can you post stats from advanced settings then technical log



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springett
Contributor
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Message 4 of 6

Re: Slow upload speed

They do both fall in the impacted range, but there's a crossover between 16.5 and 18.1. Either way, my point is the download is definitely not at the lower end of impacted unlike the upload. It's either the lower end of clean or the higher end of impacted. How is it that the upload doesn't follow the same pattern?

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licquorice
Distinguished Sage
Distinguished Sage
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Message 5 of 6

Re: Slow upload speed


@springett wrote:

 How is it that the upload doesn't follow the same pattern?

 


Upload and download use different portions of the frequency spectrum utilised and will be affected differently.

 

A VDSL signal consists of some 4000 tones or discrete frequencies and each tone carries a number of bits of the signal. Below is a graph of my signal, red is download frequencies and green is upload. As you can see, different frequencies carry differing number of bits depending on interference and attenuation of the signal.

 

bitspertone.jpg

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springett
Contributor
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Message 6 of 6

Re: Slow upload speed

So is there anything I can actually do to increase the upload speed? The engineer said it would definitely increase but it hasn't.

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