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.


eldite

13 posts

Geek


#261936 23-Dec-2019 15:24
Send private message

Our community of around 130 houses finally received Fibre to our cabinet and an upgrade to VDSL about 6 months ago.   Prior to that we had ADSL1, 6mbps shared over 58 users.   So it's a major upgrade!

 

I'm lucky in that my VDSL syncs at 122Mbps down.   However unless it's between midnight to 6am, speed tests just jump to 60Mbps and sit there for the duration of the test. 

 

After midnight, speeds jump to 96Mbps and sit at that for the duration of the test.  

 

There is absolutely no question that is it being limited by either Chorus or Skinny during daytime hours.  The behavior is consistent and reproducible. 

 

I really don't care, 60Mbps is fine, but I'm interested if anyone else has seen this, or knows what's going on?   

 

I'd love to see more transparency around these policies. 

 

Also, wondering if anyone attained over 100Mbps on VDSL before?   or if it's not possible?   The spec for my Annex says max 100, but it's syncing in excess of that. 

 

 

 

hope you'll are having a happy Christmas holiday. 


View this topic in a long page with up to 500 replies per page Create new topic
 1 | 2
  #2380502 23-Dec-2019 15:44
Send private message

its possibly to go all the way up to about 130mbps with VDSL.


 
 
 

Free kids accounts - trade shares and funds (NZ, US) with Sharesies (affiliate link).
Handle9
11241 posts

Uber Geek

Trusted
Lifetime subscriber

  #2380539 23-Dec-2019 17:39
Send private message

Chorus or Skinny won't be limiting your connection. It will be a physical limitations either caused by back haul limitations or more likely cross talk.

Talkiet
4787 posts

Uber Geek

Trusted

  #2380550 23-Dec-2019 17:47
Send private message

It's worth pointing this sticky (which is in the Spark forum admittedly)..

 

https://www.geekzone.co.nz/forums.asp?forumid=39&topicid=171109

 

It applies to Skinny and Bigpipe fixed BB as well.

 

Cheers - N





Please note all comments are from my own brain and don't necessarily represent the position or opinions of my employer, previous employers, colleagues, friends or pets.




cyril7
9050 posts

Uber Geek

ID Verified
Trusted
Subscriber

  #2380628 23-Dec-2019 19:22
Send private message

Hi, have multiple customers on VDSL connections syncing over 100Mb/s, this is quite normal. I also have a couple of modems that sit in the same room as the Chorus ISAM with 10m max of jumper wire between the ISAM and modem, they sync around 130Mb/s with around 30Mb/s up.

 

As Neil (Talkiet) says Spark do not limit any connection in any way, and Chorus continuously monitor uplinks from cabinets for saturation and upgrade to eliminate congestion, so my guess is its more likely increased traffic in the local loop phone cabling taking a hit as users start streaming during prime time. Ths is where the VDSL connections between the cabinet and house start to have impacted performance.

 

But honestly, you get 60Mb/s during peak hour, is there more you need?, you do realise that 60Mb/s is waaay more than enough to successfully stream multiple HD or even 4K services plus not impact on any browsing

 

Cyril


eldite

13 posts

Geek


  #2382316 28-Dec-2019 22:35
Send private message

This is an example over a couple of days.  You can see it's 60Mbps all the time, then it isn't.  Times in UTC.   

 

 

 

 

In my opinion it's unquestionably being limited.  Congestion doesn't work like this and it can't be physical limitations because it's only certain times of day.  

 

 

 

I guess no one else here has seen this, and the only problem I have with it is that it means that it isn't faster than my friends fibre like it ideally would be :)


Talkiet
4787 posts

Uber Geek

Trusted

  #2382320 28-Dec-2019 22:43
Send private message

Skinny isn't doing any rate limiting on any fixed BB connections. If I can be any clearer, please let me know how.

 

Cheers - N

 

 





Please note all comments are from my own brain and don't necessarily represent the position or opinions of my employer, previous employers, colleagues, friends or pets.


Linux
11289 posts

Uber Geek

Trusted
Lifetime subscriber

  #2382321 28-Dec-2019 22:46
Send private message

You should be very happy with 60Mbps after putting up with ADSL1




raytaylor
4006 posts

Uber Geek

Trusted

  #2382329 29-Dec-2019 00:02
Send private message

Crosstalk will affect DSL connections - multiple neighbors causing interference as the signals travel down the copper pairs next to each other in the trunk cable going down the road. 

 

Some DSLAMs have some fancy noise cancellation which helps lower the effects and push higher speeds over longer distances when crosstalk causes problems. This is called "Vectoring"

 

Each VDSL connection has a CIR base rate which chorus guarantees. If the CIR (committed information rate) is not met, it is then considered a fault. 
With the old ADSL it was 64kbps average over a 15 minute period (someone else can confirm)   

 

With VDSL, it is still quite low - i think it might still be the same as ADSL, except that when capacity is available, it will go faster. 

 

 

 

So if there are speed variances to your ISPs speed test server, it could be 
- DSL tail slowing down due to crosstalk or other interference  
- Backhaul fiber between the cabinet and the isp becoming congested (though chorus now over provision this in most areas)
- An issue at the ISP end 

 

However 60mbits is more than the 2.6mbits required for HD netflix so its all good. 





Ray Taylor

There is no place like localhost

Spreadsheet for Comparing Electricity Plans Here


yitz
2052 posts

Uber Geek


  #2382332 29-Dec-2019 00:42
Send private message

Do Spark/Skinny/Bigpipe still use xDSL port line rate data passed on from Chorus to do some sort of traffic policing at their BNGs? I recall at one stage Bigpipe offered some fancy prioritisation functionality through their app. On Spark Retail connections they also did something to improve good throughput??

 

Also that slight difference in latency is interesting, I assume you are testing to the same server. I recall when I used Spark personally the connection would stop passing traffic for a few seconds at the same time most (every?) early evening and at the same time there would be a slight bump in latency, I put it down to them load balancing paths within their core network. I don't recall there being any association with connection performance in terms of throughput/speed, but it was only a ADSL2+ connection.

 

As for why it is capping out at 95 Mbps would that be because you have equipment that is only capable of 100 Mbps Ethernet or do you have a gigabit LAN.


toejam316
1459 posts

Uber Geek

Trusted
Lifetime subscriber

  #2382334 29-Dec-2019 04:57
Send private message

eldite:

 

This is an example over a couple of days.  You can see it's 60Mbps all the time, then it isn't.  Times in UTC.   

 

 

 

 

In my opinion it's unquestionably being limited.  Congestion doesn't work like this and it can't be physical limitations because it's only certain times of day.  

 

 

 

I guess no one else here has seen this, and the only problem I have with it is that it means that it isn't faster than my friends fibre like it ideally would be :)

 

 

One thing I'm noticing is your latency is dropping too, pretty consistently. Have you had a squizz at your modem stats to see what if anything is changing between these periods?





Anything I say is the ramblings of an ill informed, opinionated so-and-so, and not representative of any of my past, present or future employers, and is also probably best disregarded.


robjg63
4090 posts

Uber Geek

Subscriber

  #2382340 29-Dec-2019 08:12
Send private message

Hey folks. There are a few comments above to the effect of "why are you complaing? 60 is good enough".

The OP says "I really don't care, 60Mbps is fine, but I'm interested if anyone else has seen this, or knows what's going on? "

I am not reading the post as a complaint - just a query about a curious connection issue.




Nothing is impossible for the man who doesn't have to do it himself - A. H. Weiler


  #2382341 29-Dec-2019 08:15
Send private message

your results dont exactly line up to being limited during the day. 23rd at 7am is 57mbps, the the following day at 6am its 95mbps. it doesnt seem consistent, more like its resynced at a lower speed. check the connection log.

 

the latency change to me seems like something else is happening, because it it was rate limited the latency shouldnt change.

 

can you provide more info? modem stats for the slower and faster times?


RunningMan
8907 posts

Uber Geek


  #2382346 29-Dec-2019 08:41
Send private message

Talkiet:

 

Skinny isn't doing any rate limiting on any fixed BB connections. If I can be any clearer, please let me know how.

 

 

Just to reiterate this, @Talkiet knows the answer to this. There is no rate limiting going on.

 

As others have already noted, there is a correlation between increased latency and decreased throughput, but only on the downstream. Given upstream remains unaffected, I'd suggest that the common issue of upstream saturation due to cloud services is unlikely the culprit here. From the brief numbers you have provided, it looks to change behaviour about once per day. This is consistent with DLM resyncing the line, and changing to a different profile. I suggest looking at the modem you are using, ensure that firmware is current, and monitor the VDSL line stats over several days; specifically sync rate, noise margin and line profile. If your modem has a log, check for line sync drops.

 

Post those line stats here if you need help interpreting them.


sbiddle
30853 posts

Uber Geek

Retired Mod
Trusted
Biddle Corp
Lifetime subscriber

  #2382353 29-Dec-2019 08:58
Send private message

As others have indicated speedtest results only show a part of the picture.

 

Sync rate is what is critical here, and based on the very limited information the OP has shown so far my best guess would would be that ddDLM is dynamically changing this which is also why the latency is increasing.

 

 


yitz
2052 posts

Uber Geek


  #2382420 29-Dec-2019 12:28
Send private message

Jase2985:

 

your results dont exactly line up to being limited during the day. 23rd at 7am is 57mbps, the the following day at 6am its 95mbps. it doesnt seem consistent, more like its resynced at a lower speed. check the connection log.

 

 

Even accounting for UTC+13 just shows that conditions changed early evening on the 24th.

 

23/12 2.29p limited
24/12 10.46a limited
23/12 8.12p limited
24/12 1.26p limited
24/12 2.15p limited
24/12 3.10p limited
24/12 7.28p full speed
24/12 10.46p full speed

 

I would say points toward ddDLM and sync rates.

 

Would be good if Chorus provided a public API to query port stats now they are always collecting data but I assume it still have to be done through ISP helpdesk.


 1 | 2
View this topic in a long page with up to 500 replies per page Create new topic





News and reviews »

Bolt Launches in New Zealand
Posted 11-Jun-2025 00:00


Suunto Run Review
Posted 10-Jun-2025 10:44


Freeview Satellite TV Brings HD Viewing to More New Zealanders
Posted 5-Jun-2025 11:50


HP OmniBook Ultra Flip 14-inch Review
Posted 3-Jun-2025 14:40


Flip Phones Are Back as HMD Reimagines an Iconic Style
Posted 30-May-2025 17:06


Hundreds of School Students Receive Laptops Through Spark Partnership With Quadrent's Green Lease
Posted 30-May-2025 16:57


AI Report Reveals Trust Is Key to Unlocking Its Potential in Aotearoa
Posted 30-May-2025 16:55


Galaxy Tab S10 FE Series Brings Intelligent Experiences to the Forefront with Premium, Versatile Design
Posted 30-May-2025 16:14


New OPPO Watch X2 Launches in New Zealand
Posted 29-May-2025 16:08


Synology Premiers a New Lineup of Advanced Data Management Solutions
Posted 29-May-2025 16:04


Dyson Launches Its Slimmest Vaccum Cleaner PencilVac
Posted 29-May-2025 15:50


OPPO Reno13 Pro 5G Review 
Posted 29-May-2025 15:33


Logitech Introduces New G522 Gaming Headset
Posted 21-May-2025 19:01


LG Announces New Ultragear OLED Range for 2025
Posted 20-May-2025 16:35


Sandisk Raises the Bar With WD_BLACK SN8100 NVME SSD
Posted 20-May-2025 16:29









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.







Backblaze unlimited backup