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Topic # 161879 22-Jan-2015 11:44
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Hey all,

I'm current on ADSL2 with Iconz and that's for what it is usually a very stable connection.

The current sync rates are:

Down Up
SNR (dB): 12.4 15.5
Attn(dB): 25.0 10.1
Pwr(dBm): 19.7 12.4
Max(Kbps): 15596 945
Rate (Kbps): 12474 945

I'm using a Netgear router in which I can tweak the SNR margin, so I'm aware that I could probably increase the down speeds a bit to ~13.5-14 Mbps (from past experience).

Also, the house has a master filter installed are as far as I'm aware we're on the Karori Exchange.

Now, I'm switching ISP to Mynxnet and when they ran a prequel at my address it came back with this:

lineAttenuation: 9 - 9 dB
downloadRate: ADSL2+: 14.8 - 14.8 Mb/s, VDSL2: 17.6 - 17.6 Mb/s
uploadRate: ADSL2+: 1.2 - 1.2 Mb/s, VDSL2: 7.2 - 7.2 Mb/s

So we thought we'd give VDSL a go --- being aware that the Down Attenuation I have with 25dB is quite high for a stable VDSL connection to occur. Yes, it would have been very slow VDSL, but I mostly care about an improved uplink speed anyway, even 2Mb/s upstream would have been worth it for me.

This morning the install was happening and neither my new VDSL modem nor the Tech's test gear would even handshake properly.

When he climbed up the pole he said that the wire pair I'm on is used by a bunch of other terminals and that'd probably be causing the issues with the line. My (maybe naive) question of either switch me to another wire or if it's possible to pull another separate wire up through the ducts from the exchange was pretty much responded to with "Chorus essentially doesn't invest into the copper network anymore". Fair enough, I'd have potentially even paid some money for a private cable to be pulled up the road for me to be used though.

Anyway, all was rolled back to ADSL with Iconz and Mynxnet put in an ADSL-ADSL transfer that hopefully goes through tomorrow or so.

I just thought I'd put the question out there to make sure I've checked all avenues...

a) Given my ADSL stats, does anyone see a chance that the issue could be something else but the line from here to the Exchange?
b) Why do the prequals come back with kind of "unrealistic" promises of VSDL --- even the Spark website just 10 minutes ago said I could get even Ultra VDSL --- sigh.
c) Any chance I can do anything to convince Chorus into doing _something_ (I'm not a network/telco tech, so bear with me not really knowing a lot about this) about the line quality (given that I agreeably have a very stable ADSL connection)?

Any feedback very appreciated!

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  Reply # 1219930 22-Jan-2015 11:44
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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.

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  Reply # 1219942 22-Jan-2015 11:52
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From those stats looks like you are on a ADSL2+ only line card, maybe there are no spare ports on a VDSL2 capable line card available at your exchange?
(a line card is like the modem at the other end)

I presume the Chorus tech installed a master filter?


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  Reply # 1219954 22-Jan-2015 11:56
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Yes, these stats are from and ADSL2 only card.

The Chorus tech had me switched over to a VDSL card in the exchange and then came up to the house to do the install.

The house has a master filter, installed by a Chorus tech in August 2012 (ish) and today's Tech opened the box, looked at all of it and said it was fine to use.

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  Reply # 1219977 22-Jan-2015 12:16
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There are unfortunately lots of variables that can affect VDSL2, and attenuation is only one of those. You can have a scenario where attenuation may fall into an acceptable region, but due to noise in the MPF bundle it can affect things. There have been plenty of instances of reduced VDSL2 speeds in the last few months, some of this due to crosstalk. Data services such as E1's in the same MPF can also have cause major problems.

In the situation there probably isn't much that can be done for you.

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  Reply # 1219991 22-Jan-2015 12:22
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Chorus VDSL2 is certainly optimised for short lines within approx 1 km , with 25 dB you are probably 1.2-1.5 km, not that there really is any hope for longer lines with the technology anyway.

Since you are directly connected to the exchange (not thru a cabinet) maybe consider an unbundled ISP who have deployed their own MSAN gear in the exchange. I am also too far from my exchange to get VDSL2 but with Compass unbundled ADSL2+ I can get 1.8 Mb/s upload using ADSL2+ annex M. Other brands who have their own gear include Slingshot and Flip (and maybe Orcon now they are part of CallPlus group).

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  Reply # 1220219 22-Jan-2015 16:36
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Thx guys, I figured it would be a long shot to change anything to the situation as it is now, still worth having asked :)

I'll update this thread in case of any new development.

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  Reply # 1221358 24-Jan-2015 13:38
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If you want to get a better upload than ADSL2+ then you can try VDSL. If your line attenuation is too noisy or your provider does a prequal they may not let you get it. I am also about 700m walk from the cabinet, and if the line were direct I would get better sync speeds, but I dont really know where my line runs.  

Just as a bit of FYI


This doesn't necessarily mean that you will be able to get it or get a stable connection, but my ADSL2+ was syncing at:

1.1mbit up / 11mbit down (with my fritzbox 7340)
800bit up / 7mbit down (with the telecom technicolour tg582n modem)

And now I am on VDSL and plan to stay with it.
3mbit up / 16 mbit down

A lot of people wouldnt bother with VDSL if it was only a little bit better. In some cases ADSL2+ will be more stable But I have had the line for about 2 weeks and it has not had any issues or disconnection problems according to the logs.

So if you are on ADSL make you you got a good quality modem and a Master Filter will be beneficial too. If you don't already have a master filter you may find your line could run even better.

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  Reply # 1221467 24-Jan-2015 17:03
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If you have a downstream attenuation of 25dB with a master filter, you're not going to get a useable VDSL connection.


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