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Upstream rate only half of achievable speed

2010dsc
Grafter
Posts: 34
Registered: 07-01-2014

Upstream rate only half of achievable speed

Up to the end of March my upstream speed was a steady-ish 15 Mbps.  Since then it fluctuates between 10 and12 Mbps.  Using the BT Wholesale Broadband Performance Test shows 10.13 Mbps with an achievable speed of 20 Mbps.  My download speed is between 35 and 38 Mbps.  The IP profile is 38.04.  Is there a problem with my upload speed or can it return to nearer 20 Mbps?
I look forward to hearing from you.
David
9 REPLIES
Plusnet Help Team
Plusnet Help Team
Posts: 5,622
Thanks: 531
Fixes: 204
Registered: 01-01-2012

Re: Upstream rate only half of achievable speed

Your upload sync has dropped to around 12mbps. It's not down to DLM and our testing isn't finding any faults on the line.
We'd struggle to raise this to our suppliers I'm afraid as it's not a big drop.
If this post resolved your issue please click the 'This fixed my problem' button
 Matthew Wheeler
 Plusnet Help Team
djtoastie
Grafter
Posts: 52
Registered: 16-07-2015

Re: Upstream rate only half of achievable speed

I would call half the speed a big drop!  Roll eyes
Community Gaffer
Community Gaffer
Posts: 17,665
Thanks: 658
Fixes: 162
Registered: 05-04-2007

Re: Upstream rate only half of achievable speed

It hasn't dropped to half the speed?
It was at around 15Mbps, now it's synced at 12Mbps.
The BT Speedtester will show the upstream achievable speed as 20Mbps because that's the wholesale service it's provided on.
The current speed is still above the upstream estimates for the line so as Matthew says we won't be able to raise this as a fault.
If this post resolved your issue please click the 'This fixed my problem' button
 Chris Parr
 Plusnet Staff
Estragon
Rising Star
Posts: 811
Thanks: 10
Registered: 07-02-2012

Re: Upstream rate only half of achievable speed

@djtoastie
All FTTC lines show the upstream IP Profile = the maximum speed for the product.
2010dsc
Grafter
Posts: 34
Registered: 07-01-2014

Re: Upstream rate only half of achievable speed

No explanation for the drop in speed then.
Terranova667
Pro
Posts: 1,297
Thanks: 75
Fixes: 3
Registered: 19-02-2014

Re: Upstream rate only half of achievable speed

It could be line interference or crosstalk both of which can cause the drop your seeing I have gone from 65Mb down 10Mb up to 55Mb down and 5Mb up due to interference and or cross talk or so i'm told by plusnet support etc,  it also could be the start of a developing fault, there isn't anything you can do or at least there is nothing Plusnet or BTW will do until the speeds drop below your estimated range.
2010dsc
Grafter
Posts: 34
Registered: 07-01-2014

Re: Upstream rate only half of achievable speed

Thank you Terranova667 for your input.  It's a shame plusnet can't offer an explanation, rather than three letter acronyms.
Community Veteran
Posts: 6,824
Thanks: 1
Registered: 27-10-2012

Re: Upstream rate only half of achievable speed

Quote from: Terranova667
  it also could be the start of a developing fault, there isn't anything you can do or at least there is nothing Plusnet or BTW will do until the speeds drop below your estimated range.

Incorrect - if you fail the KBD checks, Plusnet can request an engineer to fix the detected fault.
sjptd
Grafter
Posts: 486
Thanks: 4
Registered: 01-09-2014

Re: Upstream rate only half of achievable speed

This is sort of implied in the answers already, but to be more precise .....
DLM does not apply a profile on upstream,it is defined by your package; in your case 20Mbps.
BTW test result uses the word 'achievable' to relate to the DLM limit, which is at best confusing or misleading, and is really just plain incorrect.
So, your line is performing reasonably, even if not quite as well as before.
The drop in speed may be because of crosstalk with new users on the cabinet, some other slight degradation on the line, a noisy power supply or motor somewhere, or (if you are testing wireless) because of extra wireless conflicts.
Your main and justified gripe is against the confusing wording on the BTW speedtest, and against the fact that it is not as easy as it might be to get at other stats that show how the line might perform and what is really 'achievable'.