Sudden loss of VDSL upload speed/maximum upload upstream rate

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dejadeadnz

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Topic # 198486 11-Jul-2016 13:07

Anyone got any ideas on the following situation?

The old man has a VDSL connection with Vodafone and I have previously seen all the line stats where the maximum line speed for downloads is around 90 megabits and uploads around 35+, all from speedtests using an ethernet connection. And this also is consistent with my own usage experiences when over here. He has complained that over the last few weeks the line can only reach a maximum download speed of around 50 megabits, which is a slight annoyance but not a huge deal to him. The upload speed had remained just as good as always.

I rang up support for him and after doing port resets and a few tests, I speedtested whilst on a call with the CSR and upload speed has dropped to 12 megabits which, if it continues, will present problems as there are kiddie relatives who come over and do things like video editing and uploads. His lines stats on the HG659 router now reads as follows:

DSL synchronization status: Up

Connection status: Showtime

Upstream line rate (kbit/s): 12050

Downstream line rate (kbit/s): 69643

Maximum upstream rate (kbit/s): 12038

Maximum downstream rate (kbit/s): 69674

Upstream noise safety coefficient (dB): 8.8

Downstream noise safety coefficient (dB): 9.2

Upstream interleave depth:0

Downstream interleave depth: 0

Line standard:VDSL

Upstream line attenuation (dB):7.5

Downstream line attenuation (dB): 4.8

Upstream output power (dBmV): -20.2

Downstream output power (dBmV): 13.1

Downstream interleave depth: None

DSL up time: 0 days 0 hours 54 minutes 21 seconds

A chorus technician has been called out. I am hoping that there is a fault and not a loss of some kind of amazing profile which previously enabled the really great upload speeds. Any other ideas?

PeterReader

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Reply # 1589624 11-Jul-2016 13:07

Hello... Our robot found some keywords in your post, so here is an automated reply with some important things to note regarding broadband speeds.

If you are posting regarding DSL speeds please check that

you have reset your modem and router
your PC (or other PCs in your LAN) is not downloading large files when you are testing - you are not being throttled by your ISP due to going over the monthly cap
your tests are always done on an ethernet connection to the router - do not use wireless for testing
you read this topic and follow the instructions there.

Make sure you provide information for other users to help you. If you have not already done it, please EDIT your post and add this now:

Your ISP and plan
Type of connection (ADSL, ADSL2, VDSL)
Your modem DSL stats (do not worry about posting Speedtest, we need sync rate, attenuation and noise margin)
Your general location (or street)
If you are rural or urban
If you know your connection is to an exchange, cabinet or conklin
If your connection is to a ULL or wholesale service
If you have done an isolation test as per the link above

Most of the problems with speed are likely to be related to internal wiring issues. Read this discussion to find out more about this. Your ISP is not intentionally slowing you down today (unless you are on a managed plan). Also if this is the school holidays it's likely you will notice slower than usual speed due to more users online.

A master splitter is required for VDSL2 and in most cases will improve speeds on DSL connections. Regular disconnections can be a monitored alarm or a set top box trying to connect. If there's an alarm connected to your line even if you don't have an alarm contract it may still try to connect so it's worth checking.

I recommend you read these two blog posts:

I am the Geekzone Robot and I am here to help. I am from the Internet. I do not interact. Do not expect other replies from me.

dejadeadnz

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Reply # 1589671 11-Jul-2016 13:34

So just to clarify, essentially there are two issues:

1. Download speeds on speed test was about half of the maximum line speed (slightly annoying but not a huge problem) - connected (possibly) with this is the loss of maximum line speed for downloads after the port reset.

2. Upload speeds/maximum upload throughput literally went from 30-something down to 12 megabits, again during the space of one phone call and connected port resets etc. I really, really hope he gets his upload speeds back.

Sideface

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Reply # 1589690 11-Jul-2016 13:53

Chorus changing to 998 bandplan ?

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sbiddle

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Reply # 1589692 11-Jul-2016 13:57

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There is no fault. I can imagine your ISP may charge you for a callout as this will be a NFF coded job.

VDSL2 is best effort. DLM might give you your upstream back if it determines whatever caused the drop is no longer effecting your line.

dejadeadnz

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Reply # 1589695 11-Jul-2016 14:00

We didn't ask for a call out - the VF rep initiated it. To be frank, we are now seriously regretting the call. The download speed "issue" wasn't a big deal but whatever it is that they did to his upload speed is seriously annoying. The VF guy was also quite adamant that something was wrong but nothing at the old man's end has changed.

Double clarifying: The VF rep insisted that something was wrong at Chorus' end. I think this thread is a lesson to people that, if your connection isn't too bad, it doesn't pay to poke a stick at it. He's been at 30+ megabits for upload for well over a year and boom that is now all gone and might not be back. All in the space of minutes :( How often does the DLM do its work?

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Reply # 1589706 11-Jul-2016 14:27

"The 998 VDSL band plan is more asymmetric, meaning higher download speeds (at the expense of lower upload speeds) compared to speed achieved under the 997 band plans." - http://www.tcf.org.nz/content/576773bf-4406-4a4f-8796-f217148d3201.html

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dejadeadnz

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Reply # 1589711 11-Jul-2016 14:42

Sideface:

"The 998 VDSL band plan is more asymmetric, meaning higher download speeds (at the expense of lower upload speeds) compared to speed achieved under the 997 band plans." - http://www.tcf.org.nz/content/576773bf-4406-4a4f-8796-f217148d3201.html

Doesn't sound like this is the issue. He previously had well over 10 megabits upload (as previously stated) and the document states clearly that the 997 profile is UL speed limited to 10 megabits.

Talkiet

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Reply # 1589712 11-Jul-2016 14:42

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Just to provide a bit more context... The profile that allows 30Mbps upstream is extremely sensitive to changes in line performance and even things like other residents getting ADSL or VDSL. Someone getting DSL nearby might easily be enough for the system to give up on the better profile and drop your father back to still a very very good VDSL profile.

There's really nothing wrong here... You should not expect VDSL performance (at the xDSL level) to remain constant over time because it varies with external factors.

Cheers - N

dejadeadnz

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Reply # 1589718 11-Jul-2016 14:49

Thanks, that's helpful. I should also mention that before the port restart, I ran a speed test and it was uploading at 30+ megabits. The moment they restarted, the line evidently went to another profile. It's probably time that he went to fibre but all the installation horrors and installers not turning up etc has put him off.

Let's hope DLM does its magic and he gets his profile back.....

Jaxar

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Reply # 1589725 11-Jul-2016 15:13

Been a half a dozen years since I was trained on a port restart but back then we were told it would put a customer to the default profile. This was significant for customers who were put on a specific profile to reduce sync drops.

Please note: I have a professional bias towards Vodafone.

sbiddle

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Reply # 1589730 11-Jul-2016 15:23

dejadeadnz:

Thanks, that's helpful. I should also mention that before the port restart, I ran a speed test and it was uploading at 30+ megabits. The moment they restarted, the line evidently went to another profile. It's probably time that he went to fibre but all the installation horrors and installers not turning up etc has put him off.

Let's hope DLM does its magic and he gets his profile back.....

You didn't mention the issue only occurred after the port reset. There's part of your problem right there.

If and when DLM determines your line is acceptable can support the higher upload it should go back up to what it was prior to the reset, but don't necessarily expect what you had a few weeks ago. Your line has obviously changed as a result of external factors and there is no fault.

Jase2985

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Reply # 1589782 11-Jul-2016 16:03

here is your problem right here: "after doing port resets"

you have gone from 17a to 8b, and there is nothing you can do but wait and hope it goes back to 17a (which is should) but who know how long that will take.

if the measured speed-test drops, check the sync rate, if thats fine then the issue is with the users internal network/devices not the connection.

dejadeadnz

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Reply # 1590954 13-Jul-2016 13:13

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Well, here's a wee update. The suspicions above have been confirmed. Here's an update:

1. VF has confirmed that the first CSR was silly to do a port refresh, as it mucks up the DLM.

2. They are hopeful that the UL speeds will return after DLM does its thing.

3. Port refreshes should not be done unless absolutely necessary and the CSR should have known this.

4. Chorus came this morning and no fault was found. VF have agreed to eat the fee, since it was the first CSR that lodged it when there was no fault. The old man is also getting an account credit for his troubles.

The speedtests also returned back to getting results close to line sync rate beginning from yesterday -- like I said earlier, the download speed "issue" wasn't a huge one for us and VF was contacted more on a "hey just wondering what is going on" basis. Upload speeds still sitting at 13 megabits. All up, not a great tech support experience with VF.

hio77

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Reply # 1590975 13-Jul-2016 13:50

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dejadeadnz:

Well, here's a wee update. The suspicions above have been confirmed. Here's an update:

1. VF has confirmed that the first CSR was silly to do a port refresh, as it mucks up the DLM.

2. They are hopeful that the UL speeds will return after DLM does its thing.

3. Port refreshes should not be done unless absolutely necessary and the CSR should have known this.

4. Chorus came this morning and no fault was found. VF have agreed to eat the fee, since it was the first CSR that lodged it when there was no fault. The old man is also getting an account credit for his troubles.

The speedtests also returned back to getting results close to line sync rate beginning from yesterday -- like I said earlier, the download speed "issue" wasn't a huge one for us and VF was contacted more on a "hey just wondering what is going on" basis. Upload speeds still sitting at 13 megabits. All up, not a great tech support experience with VF.

port refesh Yeah ouch. that kills 17a.

For a 8b line, those stats are pretty decent, give it time to move back to 17a.

Bandplans for VDSL cant be assured sadly.

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dejadeadnz

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Reply # 1605540 6-Aug-2016 16:49

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Just want to update this. A happy ending -- the old man and the kids who visit his house got their upload speed back. 29 megabits per second now.