Slow upload 443kbps and intermittent issues
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- Re: Slow upload 443kbps and intermittent issues
15-03-2021 3:15 PM
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Hi All,
I'm still waiting for the explanation from the ISP as to why I have such a low upload speed and dropping connections but in the meantime I wanted to see if any technical people on this forum could have a reasonable explanation to my problems.
As with all the stories the problem started when I changed the ISP. I was in the past with PlusNet and had no problems, I moved to Post Office and had no problems and when switched back to PlusNet the internet is not as it was before.
I'm on ADSL2+ using PlusNet 2704N router.
Does anybody have any reasonable explanation why the Upstream speed is 443 when the line can handle 1228Kbps. Even the engineer from Openreach that came around was surprised. He changed all the cabling between the house and the exchange and internal socket. They seen some issue initially but were not sure what it was. His speed tests indicated that I should be able to achieve 20+ Mb download and 1Mb upload as I'm very close to the exchange. PlusNet says that they don't cap this but reading the forum it feels like it is not the true.
The other surprising thing is that the SNR. How can it be so low for download 3.1 and so high for upload 33.8 dB?
Any help would be appreciated, below is my xDSL:
Mode: | ADSL_2plus | |||
Traffic Type: | ATM | |||
Status: | Up | |||
Link Power State: | L0 | |||
Downstream | Upstream | |||
Line Coding(Trellis): | On | On | ||
SNR Margin (1 dB): | 3.1 | 33.8 | ||
Attenuation (1 dB): | 13.5 | 6.4 | ||
Output Power (1 dBm): | 0.0 | 12.0 | ||
Attainable Rate (Kbps): | 24076 | 1228 | ||
Path 0 | Path 1 | |||
Downstream | Upstream | Downstream | Upstream | |
Rate (Kbps): | 24382 | 443 | 0 | 0 |
MSGc (# of bytes in overhead channel message): | 93 | 12 | 0 | 0 |
B (# of bytes in Mux Data Frame): | 248 | 13 | 0 | 0 |
M (# of Mux Data Frames in FEC Data Frame): | 1 | 1 | 0 | 0 |
T (Mux Data Frames over sync bytes): | 2 | 4 | 0 | 0 |
R (# of check bytes in FEC Data Frame): | 0 | 0 | 0 | 0 |
S (ratio of FEC over PMD Data Frame length): | 0.3261 | 0.9911 | 0.0 | 0.0 |
L (# of bits in PMD Data Frame): | 6108 | 113 | 0 | 0 |
D (interleaver depth): | 1 | 1 | 0 | 0 |
Delay (msec): | 0 | 0 | 0.0 | 0.0 |
INP (DMT symbol): | 0.00 | 0.00 | 0.0 | 0.0 |
Super Frames: | 0 | 0 | 0 | 0 |
Super Frame Errors: | 1377 | 0 | 0 | 0 |
RS Words: | 0 | 1878381 | 0 | 0 |
RS Correctable Errors: | 0 | 0 | 0 | 0 |
RS Uncorrectable Errors: | 0 | 0 | 0 | 0 |
HEC Errors: | 710 | 0 | 0 | 0 |
OCD Errors: | 1 | 0 | 0 | 0 |
LCD Errors: | 1 | 0 | 0 | 0 |
Total Cells: | 378917461 | 84966916 | 0 | 0 |
Data Cells: | 96747387 | 18931110 | 0 | 0 |
Bit Errors: | 0 | 0 | 0 | 0 |
Total ES: | 1290 | 0 | ||
Total SES: | 0 | 0 | ||
Total UAS: | 81 | 81 |
Fixed! Go to the fix.
Re: Slow upload 443kbps and intermittent issues
15-03-2021 3:49 PM
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This topic has been moved from Tech Help to ADSL Broadband.
To argue with someone who has renounced the use of reason is like administering medicine to the dead - Thomas Paine
Re: Slow upload 443kbps and intermittent issues
15-03-2021 4:05 PM
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@Daniel_P I'm guessing something is wrong with your connection somewhere - your U/S SNR is way too high, (I think) given your closeness to the exchange and the fact that you can achieve the D/S speed you can.
Can you run the BT speedtest from here https://speedtest.btwholesale.com/ making sure you complete the advanced test, and post the result, preferably as a screen-shot?
Re: Slow upload 443kbps and intermittent issues
15-03-2021 4:08 PM - edited 15-03-2021 4:18 PM
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@jab1 spot on, this might be the problem.
Any advise who can change the IP Profile?
This are stats when I'm on WiFi with other devices connected at the same time:
Re: Slow upload 443kbps and intermittent issues
15-03-2021 4:19 PM - edited 15-03-2021 4:21 PM
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I'm guessing something is wrong with your connection somewhere - your U/S SNR is way too high
@Daniel_P @jab1 the answer is simple, the line has been provisioned with a capped upstream. It's quite common with an ADSL provision (although it shouldn't be!) to cap the upstream at 448k. Often, capping the upstream on a marginal line can give a better downstream speed. In your case, the line is very short and increasing the upstream speed won't bring the downstream speed down too much. Hopefully one of the Help team staff will see this and place an order to uncap your upstream.
As regards the dropping connections, that's probably because the DLM has decided your line is good and has reduced the downstream target SNR to 3db in an attempt to maximise the speed. You'd probably be more stable ( but with slightly reduced downstream speed ) on a fixed 6db margin.
Any advise who can change the IP Profile?
The profile is calculated by the DLM from the synch speed. so getting the upstream uncapped will cause the profile to increase
Superusers are not staff, but they do have a direct line of communication into the business in order to raise issues, concerns and feedback from the community.
Re: Slow upload 443kbps and intermittent issues
15-03-2021 4:21 PM
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Cheers @MisterW you saved me a load of typing there. I'd just opened the reply window. 😁
Re: Slow upload 443kbps and intermittent issues
15-03-2021 4:29 PM
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Thank you both for help @MisterW @jab1
I just found a post where you were able to resolve similar problem in the past. Would you be bale to help with the same here?
Fixed: Re: Upload Ip profile change + download change? - Plusnet Community
15-03-2021 4:50 PM
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Hi Daniel,
I've changed the SNRM target of your line from 3dB to 6dB, and I've placed an order to uncap your upload speed, which should go through tomorrow. Let us know if there are further issues afterwards.
Re: Slow upload 443kbps and intermittent issues
16-03-2021 9:22 AM
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@Gandalf thank you very much for applying the change. My profile changed already and speeds are back to normal.
Here is updated xDSL for reference:
Mode: | ADSL_2plus | |||
Traffic Type: | ATM | |||
Status: | Up | |||
Link Power State: | L0 | |||
Downstream | Upstream | |||
Line Coding(Trellis): | On | On | ||
SNR Margin (1 dB): | 6.0 | 6.8 | ||
Attenuation (1 dB): | 13.0 | 6.4 | ||
Output Power (1 dBm): | 0.0 | 11.9 | ||
Attainable Rate (Kbps): | 22916 | 1260 | ||
Path 0 | Path 1 | |||
Downstream | Upstream | Downstream | Upstream | |
Rate (Kbps): | 23177 | 1255 | 0 | 0 |
MSGc (# of bytes in overhead channel message): | 55 | 12 | 0 | 0 |
B (# of bytes in Mux Data Frame): | 254 | 38 | 0 | 0 |
M (# of Mux Data Frames in FEC Data Frame): | 1 | 1 | 0 | 0 |
T (Mux Data Frames over sync bytes): | 3 | 4 | 0 | 0 |
R (# of check bytes in FEC Data Frame): | 0 | 0 | 0 | 0 |
S (ratio of FEC over PMD Data Frame length): | 0.3516 | 0.9873 | 0.0 | 0.0 |
L (# of bits in PMD Data Frame): | 5802 | 316 | 0 | 0 |
D (interleaver depth): | 1 | 1 | 0 | 0 |
Delay (msec): | 0 | 0 | 0.0 | 0.0 |
INP (DMT symbol): | 0.00 | 0.00 | 0.0 | 0.0 |
Super Frames: | 0 | 0 | 0 | 0 |
Super Frame Errors: | 2324 | 2 | 0 | 0 |
RS Words: | 0 | 3340457 | 0 | 0 |
RS Correctable Errors: | 0 | 0 | 0 | 0 |
RS Uncorrectable Errors: | 0 | 0 | 0 | 0 |
HEC Errors: | 839 | 2 | 0 | 0 |
OCD Errors: | 0 | 0 | 0 | 0 |
LCD Errors: | 0 | 0 | 0 | 0 |
Total Cells: | 1260838641 | 68201431 | 0 | 0 |
Data Cells: | 41801710 | 6885170 | 0 | 0 |
Bit Errors: | 0 | 0 | 0 | 0 |
Total ES: | 1358 | 2 | ||
Total SES: | 20 | 0 | ||
Total UAS: | 207 | 187 |
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- Re: Slow upload 443kbps and intermittent issues