Geekzone: technology news, blogs, forums
Guest
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.




82 posts

Master Geek
+1 received by user: 3


Topic # 215099 12-Jun-2017 15:56
Send private message

Hi Guys.

Before I had this speed drop I have tried as much as I can. I tried a different router no change, I have had chorus out he says all looks fine but can't explain the drop in speed. I have changed filters I just don't know what else I can do?

Before the drop in speed downstream line was 30000 kbits
maximum downstream was approx 32-33 down kbits (both were close together)

downstream noise safety coefficient reported 8.9 - 9.1

line attenuation 47.2 or 47.8 so nothing changed there.

on speedtest I easily got 28 - 30 down

now I am lucky to get 20 - 21 such a big drop.

no matter what I do, resets etc nothing works.

here is a screenshot of what I get now







Create new topic
25669 posts

Uber Geek
+1 received by user: 5414

Moderator
Trusted
Biddle Corp
Subscriber

  Reply # 1798598 12-Jun-2017 16:12
Send private message

Do you have a master filter?

 

Your speed looks fine for those stats. The drop was probably DLM adjusting your profile.

 

 




82 posts

Master Geek
+1 received by user: 3


  Reply # 1798602 12-Jun-2017 16:16
Send private message

Hi sbiddle. No master splitter. I just have the one jack.

With this DLM adjustment it can drop your speed back that much?

 
 
 
 


25669 posts

Uber Geek
+1 received by user: 5414

Moderator
Trusted
Biddle Corp
Subscriber

  Reply # 1798604 12-Jun-2017 16:18
Send private message

weetbix43: Hi sbiddle. No master splitter. I just have the one jack.

With this DLM adjustment it can drop your speed back that much?

 

If it's detecting an unstable line, yes.

 

You don't do anything abnormal such as regularly rebooting your modem or turning it off do you?

 

 


5298 posts

Uber Geek
+1 received by user: 1498

Trusted

  Reply # 1798606 12-Jun-2017 16:21
Send private message

DLM may have made a change here. 
If the HG you have is correct in saying Interleaving is off we can assume your are on DLM1 which is the best profile.
It may be due to a fault which is slowly emerging or just as simple as a neighbor got VDSL. (Noise floor has risen so it needs to compensate more)


7035 posts

Uber Geek
+1 received by user: 2230

Subscriber

  Reply # 1798608 12-Jun-2017 16:21
Send private message
5298 posts

Uber Geek
+1 received by user: 1498

Trusted

  Reply # 1798609 12-Jun-2017 16:22
Send private message

sbiddle:

 

weetbix43: Hi sbiddle. No master splitter. I just have the one jack.

With this DLM adjustment it can drop your speed back that much?

 

If it's detecting an unstable line, yes.

 

You don't do anything abnormal such as regularly rebooting your modem or turning it off do you?

 

 

 

 

 

 

System uptime is at 20 minutes so i suspect OP may have done a reboot.

@weetbix43 leave the modem alone completely. No reboots or resync's. 
Monitor for 72 hours.

 

If it gets worse call up and log a fault :) 




82 posts

Master Geek
+1 received by user: 3


  Reply # 1798623 12-Jun-2017 16:38
Send private message

Since last Monday I have done quite a few reboots trying to get the speed to where it once was but I will leave it do to it's thing over the next 4 or 5 days and see where I am at then. I guess for now nothing much I can do but monitor.

Thanks everyone for chipping in it gives me a better insight on thing's.

:)

PS @ TimA you could be right there about a neighbour getting VDLS. I have noticed on wifi a different Modem showing up could be for vdls.

5298 posts

Uber Geek
+1 received by user: 1498

Trusted

  Reply # 1798626 12-Jun-2017 16:42
One person supports this post
Send private message

weetbix43: Since last Monday I have done quite a few reboots trying to get the speed to where it once was but I will leave it do to it's thing over the next 4 or 5 days and see where I am at then. I guess for now nothing much I can do but monitor.

Thanks everyone for chipping in it gives me a better insight on thing's.

:)

PS @ TimA you could be right there about a neighbour getting VDLS. I have noticed on wifi a different Modem showing up could be for vdls.

 

 

 

Yeah chances are! Just leave her be for the next while. As they say, if it isnt broke dont fix it! (Slightly degraded in this case :P) 

 


Even ADSL could do it. I once had 2 VDSL connections. Both were slightly modified by chorus but proves the point! If i had them up and running and resync'd one of them i'd lose DSL across the other due to the noise margin raising and the Signal to noise ratio dropping! We were running more voltage etc.


4471 posts

Uber Geek
+1 received by user: 1288


  Reply # 1798711 12-Jun-2017 17:41
2 people support this post
Send private message

weetbix43: [snip] Since last Monday I have done quite a few reboots trying to get the speed to where it once was

 

This will make the line appear to be very unstable, so it will pull you back to a more conservative profile. Just leave it alone.


25669 posts

Uber Geek
+1 received by user: 5414

Moderator
Trusted
Biddle Corp
Subscriber

  Reply # 1798913 12-Jun-2017 19:56
One person supports this post
Send private message

weetbix43: Since last Monday I have done quite a few reboots trying to get the speed to where it once was

 

This would have had the exact opposite effect.

 

 


127 posts

Master Geek
+1 received by user: 55


  Reply # 1798952 12-Jun-2017 21:06
Send private message

Weetbix43,

 

What you are seeing is ddDLM trying to fine tune your line for optimum performance. As other have said, just leave it alone and do not do frequent reboots as that will confuse ddDLM.

 

My personal experience is ddDLM will try to establish the upper limit and lower limit of stability vsperformance hence the big swing in sync speed. Since ddDLM went live on line in late April:

 

 

 

  • My down stream sync speed has changed from 52Mpbs -> 58 Mpbs - 62Mbps -> 49Mbps -> 48Mbps -> 47Mbps -> 56Mbps.
  • Up stream has changed from 10 Mbps -> 18 Mpbs - 16 Mbps - 22 Mbps

As you can see it is quite a wide swing and it it very tempting to reboot the modem to try to get back the old higher sync speed. However, don't do frequent reboot as ddDLM will do the job for you if your line can sustain a higher sync speed.

 

 


Create new topic



Twitter »

Follow us to receive Twitter updates when new discussions are posted in our forums:



Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:



Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:





News »

UAV Traffic Management Trial launching today in New Zealand
Posted 12-Dec-2017 16:06


UFB connections pass 460,000
Posted 11-Dec-2017 11:26


The Warehouse Group to adopt IBM Cloud to support digital transformation
Posted 11-Dec-2017 11:22


Dimension Data peeks into digital business 2018
Posted 11-Dec-2017 10:55


2018 Cyber Security Predictions
Posted 7-Dec-2017 14:55


Global Govtech Accelerator to drive public sector innovation in Wellington
Posted 7-Dec-2017 11:21


Stuff Pix media strategy a new direction
Posted 7-Dec-2017 09:37


Digital transformation is dead
Posted 7-Dec-2017 09:31


Fake news and cyber security
Posted 7-Dec-2017 09:27


Dimension Data New Zealand strengthens cybersecurity practice
Posted 5-Dec-2017 20:27


Epson NZ launches new Expression Premium Photo range
Posted 5-Dec-2017 20:26


Eventbrite and Twickets launch integration partnership in Australia and New Zealand
Posted 5-Dec-2017 20:23


New Fujifilm macro lens lands in New Zealand
Posted 5-Dec-2017 20:16


Cyber security not being taken seriously enough
Posted 5-Dec-2017 20:13


Sony commences Android 8.0 Oreo rollout in New Zealand
Posted 5-Dec-2017 20:08



Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.



Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.