Low VDSL Sync Speeds

Forums › Spark New Zealand (including Skinny and BigPipe) › Low VDSL Sync Speeds

shakti

14 posts

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#151619 30-Aug-2014 19:38

I've recently migrated from ADSL2+ to VDSL and I'm not entirely satisfied with the rise in sync speeds. Previously on ADSL2+ my router was syncing at approximately 13 down and 1 up. With VDSL this has only marginally increased to 14.5 Down and 2.5 Up.
The cabinet I am linked to is 900m away from my house.

I do understand that there is a 10 day adjustment period, but I also understand that it is unlikely that the sync speed will change much.

The Chorus tech that came to my house measured the sync speed at the point of entry into the house and the speeds here matched those that I was getting on my router so I'm able to rule out poor wiring. Not only this, but we have cat5 all through our house given that we recently renovated. I've had a central splitter all along. The Chorus tech upgraded the line coming to the central splitter to cat5.

I guess my main question is - are these stats something that I have to live with or is there something that can be done? I was really hoping for better sync speeds. My connection stats are below. Today is day 2 after the install.

adsl: ADSL driver and PHY status

Status: Showtime

Last Retrain Reason: 0

Last initialization procedure status: 0

Max: Upstream rate = 3592 Kbps, Downstream rate = 15356 Kbps

Bearer: 0, Upstream rate = 2492 Kbps, Downstream rate = 14429 Kbps

Link Power State: L0

Mode: VDSL2

VDSL2 Profile: Profile 8b

TPS-TC: PTM Mode

Trellis: U:ON /D:ON

Line Status: No Defect

Training Status: Showtime

Down Up

SNR (dB): 11.9 0.0

Attn(dB): 0.0 0.0

Pwr(dBm): 12.8 6.4

VDSL2 framing

Bearer 0

MSGc: 40 162

B: 111 102

M: 1 1

T: 64 7

R: 16 16

S: 0.2466 1.3118

L: 4152 744

D: 131 47

I: 128 61

N: 128 122

Counters

Bearer 0

OHF: 0 0

OHFErr: 0 0

RS: 0 0

RSCorr: 0 0

RSUnCorr: 0 0

Bearer 0

HEC: 0 0

OCD: 0 0

LCD: 0 0

Total Cells: 0 0

Data Cells: 0 0

Drop Cells: 0

Bit Errors: 0 0

ES: 0 0

SES: 0 0

UAS: 24 24

AS: 1

Bearer 0

INP: 2.00 2.00

INPRein: 0.00 0.00

delay: 8 7

PER: 7.89 16.06

OR: 46.62 83.63

Bitswap: 0/0 0/0

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#1118707 30-Aug-2014 19:38

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.

Sideface

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#1118723 30-Aug-2014 19:49

"The cabinet I am linked to is 900m away from my house. "

This is exactly the result I would expect at that distance - the same thing happened to me, despite a textbook install with a master filter and a new dedicated Cat 6 cable and jack - so I reverted to ADSL.
My speed statistics before and after were exactly the same as yours.
VDSL is very sensitive to line length - and your line length may well be more than 900m.

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Coil

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#1118725 30-Aug-2014 19:50

Be good if we knew your attenuation. Best to ask ISP. Most likely a distance issue looking at those figures.

Inphinity

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#1118747 30-Aug-2014 20:35

Your best option is to move closer to a cabinet, honestly. You're pretty borderline on distance.

dcole13

534 posts

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#1118752 30-Aug-2014 20:48

13/1 sounds similar to my ADSL line. Your attenuation is probally around 20dB which is way too high for VDSL. I would go back to ADSL if it doesn't improve over the first 10 days unless you need the upload.

Home ADSL: School:

quickymart

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#1118772 30-Aug-2014 21:52

Yep, 900m is probably too far for VDSL to work well.

sbiddle

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#1118777 30-Aug-2014 22:04

Assuming your master filter installation has been done correctly there is nothing wrong. You're simply too far away from the ISAM to get a decent speed.

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shakti

14 posts

Geek

#1119083 31-Aug-2014 19:08

Thanks for the responses. I guess I don't really have much choice. I'll try and get the attenuation on the line but I have a feeling it is indeed distance related. I'll probably end up switching back to ADSL2+. The minimal speed increase isn't worth the extra $$.

shakti

14 posts

Geek

#1119111 31-Aug-2014 19:48

Any idea why my modem might be reporting line attenuation as 0 dB?

dcole13

534 posts

Ultimate Geek

#1119112 31-Aug-2014 19:49

shakti: Any idea why my modem might be reporting line attenuation as 0 dB?

What router is it?

Home ADSL: School:

shakti

14 posts

Geek

#1119117 31-Aug-2014 19:56

Using a Netgear DGND3700 v1 with richud custom firmware. I just switched to the Huawei router I got for free with the connection and these are the line stats:

I guess that clears it - the attenuation is far too high.

dcole13

534 posts

Ultimate Geek

#1119151 31-Aug-2014 20:42

shakti: Using a Netgear DGND3700 v1 with richud custom firmware. I just switched to the Huawei router I got for free with the connection and these are the line stats:

I guess that clears it - the attenuation is far too high.

Yeah unless you need the upload go adsl

Home ADSL: School:

shakti

14 posts

Geek

#1120294 2-Sep-2014 10:10

Further improvements on my line - day 4 now. Downstream rate has gone up from 14.4 to 15.2. It'll be interesting to see if it improves further.

What's really interesting is, when ADS2L+ newly came out - I recall getting sync speeds of 16 mbit for a few days. They then disappeared and were never to be seen again - my connection wouldn't ever sync more than 13 mbit on ADSL2+. I wonder if there is a cabinet limitation or line defect? Lately there has been a lot of noise on our phone line as well when speaking to people.

adsl: ADSL driver and PHY status

Status: Showtime

Last Retrain Reason: 2

Last initialization procedure status: 0

Max: Upstream rate = 3696 Kbps, Downstream rate = 15325 Kbps

Bearer: 0, Upstream rate = 2779 Kbps, Downstream rate = 15216 Kbps

Link Power State: L0

Mode: VDSL2

VDSL2 Profile: Profile 8b

TPS-TC: PTM Mode

Trellis: U:ON /D:ON

Line Status: No Defect

Training Status: Showtime

Down Up

SNR (dB): 12.0 0.0

Attn(dB): 0.0 0.0

Pwr(dBm): 12.8 6.5

VDSL2 framing

Bearer 0

MSGc: 26 156

B: 237 225

M: 1 1

T: 44 4

R: 16 16

S: 0.4971 2.5833

L: 4088 768

D: 65 96

I: 254 31

N: 254 248

Counters

Bearer 0

OHF: 0 0

OHFErr: 0 0

RS: 0 0

RSCorr: 0 0

RSUnCorr: 0 0

Bearer 0

HEC: 0 0

OCD: 0 0

LCD: 0 0

Total Cells: 0 0

Data Cells: 0 0

Drop Cells: 0

Bit Errors: 0 0

ES: 12 1

SES: 5 0

UAS: 60 60

AS: 1

Bearer 0

INP: 1.00 1.00

INPRein: 0.00 0.00

delay: 8 7

PER: 5.46 15.50

OR: 46.82 83.61

Bitswap: 0/0 0/0

Coil

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#1120307 2-Sep-2014 10:26

Corrosion + Cross Talk = lower sync. There isnt a fault really just what happens to copper over time.

coffeebaron

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#1120414 2-Sep-2014 12:19

shakti: Lately there has been a lot of noise on our phone line as well when speaking to people.

You could log a voice fault for this and see if it consequently improves your VDSL.

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