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

1 post

Wannabe Geek

Topic # 150978 9-Aug-2014 17:07
Send private message

Hi all,

I am a new Spark (Telecom) ADSL customer (new to ADSL in general- cable internet previously) and have noticed that the service, particularly the speed, is very unreliable and poor. Now I understand that the speed of an ADSL service is influenced by many factors, e.g. internal house wiring, distance to the exchange/DSLAM box, network load, etc. but I'm seeing quite a random change- drop and rise on the line speed reported by the modem stats. Let me describe my observations. 

Upon first (new) connection, the speed test results showed a speed of about 1.2Mbps down and 0.8Mbps up, 30ms ping. I am in suburban Wellington and about 1.6km from the nearest exchange. To me these stats and performance seemed pretty awful. 

The next couple of days I noticed that after every modem reboot or the one-off DSL line drop-out, after the subsequent DSL synchronisation by the modem, the reported modem stats changed dramatically- downstream (and upstream) line rates swung from 4000+ kbps (1500 kbps) to 300 kbps (300 kbps)! The performance on the speed test website reflected these modem-reported stats, where at one point at its lowest, I could barely load a webpage. 

I called up the tech desk and they asked me to perform a speed test with them on the other end, and they could confirm that the speed was unusually low (about 0.3 Mbps at this stage) and said that they noticed that that was the line speed sent out from the exchange itself. Hours after another modem reboot, the line speed was back up at around 4 Mbps, only for the DSL connection to drop out and the speed returning down to about 1.3 Mbps. 

This behaviour, either by the modem (HG630b) or the actual provisioning of the ADSL service, seems VERY bizarre to me, not to mention annoying and under-performing. I'm attaching the latest stats reported by the modem. 

Line standard ADSL2+ Channel type Interleaved  Downstream line rate (kbit/s) 1101 Upstream line rate (kbit/s) 733  Downstream SNR (dB)  12 Upstream SNR (dB)  10.9 Downstream line attenuation (dB) 36.5 Upstream line attenuation (dB) 23.4 Downstream output power (dBmV) 18.8 Upstream output power (dBmV) 12.4 Downstream CRC 0 Upstream CRC 0 Downstream FEC 0 Upstream FEC 0

Has anybody else experienced similar issues or is anyone able to shed some light as to what and why this could be happening? Your help is much appreciated!


Edit: Latest speed test; painfully slow DL. 
<a href=""><img src="" /></a>

Filter this topic showing only the reply marked as answer Create new topic
5518 posts

Uber Geek
+1 received by user: 248

Lifetime subscriber

  Reply # 1105510 9-Aug-2014 17:07
Send private message

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:



- Is your premises phone wiring impacting your broadband performance? (very technical)



- Are you receiving a substandard ULL ADSL2+ connection from your ISP?

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.

'That VDSL Cat'
8100 posts

Uber Geek
+1 received by user: 1693


  Reply # 1105522 9-Aug-2014 17:10
One person supports this post
Send private message

ild say your best bet is to have a master filter installed.

sounds likely a contact is possibly a little loose..

#include <std_disclaimer>


Any comments made are personal opinion and do not reflect directly on the position my current or past employers may have.

8025 posts

Uber Geek
+1 received by user: 387


  Reply # 1107183 12-Aug-2014 17:38
2 people support this post
Send private message

Sounds like there is an issue with your wiring somewhere along the way, keep going with the help desk process. Next step will likely be them sending a tech out.

Filter this topic showing only the reply marked as answer 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 »

Microsoft Dynamics 365 Business Central launches
Posted 10-Jul-2018 10:40

Spark completes first milestone in voice platform upgrade
Posted 10-Jul-2018 09:36

Microsoft ices heated developers
Posted 6-Jul-2018 20:16

PB Technologies charged for its extended warranties and warned for bait advertising
Posted 3-Jul-2018 15:45

Almost 20,000 people claim credits from Spark
Posted 29-Jun-2018 10:40

Cove sells NZ's first insurance policy via chatbot
Posted 25-Jun-2018 10:04

N4L helping TAKA Trust bridge the digital divide for Lower Hutt students
Posted 18-Jun-2018 13:08

Winners Announced for 2018 CIO Awards
Posted 18-Jun-2018 13:03

Logitech Rally sets new standard for USB-connected video conference cameras
Posted 18-Jun-2018 09:27

Russell Stanners steps down as Vodafone NZ CEO
Posted 12-Jun-2018 09:13

Intergen recognised as 2018 Microsoft Country Partner of the Year for New Zealand
Posted 12-Jun-2018 08:00

Finalists Announced For Microsoft NZ Partner Awards
Posted 6-Jun-2018 15:12

Vocus Group and Vodafone announce joint venture to accelerate fibre innovation
Posted 5-Jun-2018 10:52 to launch Kogan Mobile in New Zealand
Posted 4-Jun-2018 14:34

Enable doubles fibre broadband speeds for its most popular wholesale service in Christchurch
Posted 2-Jun-2018 20:07

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.