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18 posts


# 136549 1-Dec-2013 09:45
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Hi All,

I'm looking for suggestions on improving my VDSL performance. First a little background info and detail...

- Connected to Full Flavour using INNBOX V50U (naked)
- Less than 100m from cabinet

The connection was originally stood up 3-4 months ago. Due to a mix-up with the original order it was logged as connection only so no wiring changes were made at the house. This includes running the modem through the original (in-wall) adsl splitter installed by Telecom around 10 years ago. During the initial bed-in phase I was happily getting speeds of close to 50MB/s. The only problem was that my original connection was in a closet in the main bedroom. Now that the phone needed to be tethered to the modem it was a less than ideal situation.

Some bodgy diy ensued which allowed me to connect the modem to the original phone jack point in the living area but also dropped overall speeds to around the 12-20MB/s mark. I've since had Chorus in about 2 weeks ago to clean up my mess and install a proper VDSL splitter at the point of entry into the house. The current wiring situation is a VDSL splitter at point of entry, one VDSL socket in the living room (guessing 10 - 15 metre cable run) plus an unused phone socket directly above in case I ever decide to go back to standard POTS for the phone.

After all this I'm still getting around 12-20MB/s down and, pretty consistently, 6MB/s up. I'm hoping that this is due to the amount of time that it will take for VDSL to do it's thing and tune my connection back up to the speeds I originally enjoyed. In the interim, I've posted the stats from the innbox router for comment. Basically, is it just a waiting game now, or should I still be concerned? The good news is that I already know what speeds I should be able to expect. I just need to understand now what the next steps are to getting back there again. Also, is it possible to Chorus to reset the handshake period to speed up the profiling?

Snapshot from the router as below...

Statistics -- xDSL

    Mode: VDSL2 Traffic Type: PTM Status: Up Link Power State: L0     Downstream Upstream Line Coding(Trellis): On On SNR Margin (0.1 dB): 109 108 Attenuation (0.1 dB): 0 0 Output Power (0.1 dBm): 130 -68 Attainable Rate (Kbps): 18844 6896     Path 0   Path 1     Downstream Upstream Downstream Upstream Rate (Kbps): 20439 7323 0 0   B (# of bytes in Mux Data Frame): 243 235 0 0 M (# of Mux Data Frames in an RS codeword): 1 1 0 0 T (# of Mux Data Frames in an OH sub-frame): 58 3 0 0 R (# of redundancy bytes in the RS codeword): 10 14 0 0 S (# of data symbols over which the RS code word spans): 0.3797 1.0244 0.0000 0.0000 L (# of bits transmitted in each data symbol): 5352 1968 0 0 D (interleaver depth): 85 217 0 0 I (interleaver block size in bytes): 254 36 0 0 N (RS codeword size): 254 252 0 0 Delay (msec): 8 8 0 0 INP (DMT symbol): 0.50 0.50 0.00 0.00   OH Frames: 1178517 378718 0 0 OH Frame Errors: 73130 127 0 0 RS Words: 3557615 1323635 0 0 RS Correctable Errors: 66161 17124 0 0 RS Uncorrectable Errors: 47851 0 0 0   HEC Errors: 626193 0 0 0 OCD Errors: 1215 0 0 0 LCD Errors: 1215 0 0 0 Total Cells: 13336760 0 0 0 Data Cells: 593182 0 0 0 Bit Errors: 0 0 0 0   Total ES: 1245 66 Total SES: 472 1 Total UAS: 228 228

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5732 posts

Uber Geek

Lifetime subscriber

  # 943614 1-Dec-2013 09:45
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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.

28362 posts

Uber Geek

Biddle Corp
Lifetime subscriber

  # 943633 1-Dec-2013 10:16
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Sync rate isn't going to get better by waiting.


18 posts


  # 943694 1-Dec-2013 14:03
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Thanks for the quick reply.

So I take it you mean I shouldn't hold my breath waiting for DLM to kick in? Does it also mean that, all things being equal, it'll most likely be the internal wiring causing the issue?

So annoying when you've already seen around 50mb on speedtest.

5595 posts

Uber Geek

  # 943701 1-Dec-2013 14:50
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It's pretty difficult to read that table of line stats, but it looks like it is not displaying any value for attenuation, and there is also a lot of errors on the line - it suggests a physical wiring or line issue that DLM can't help you with.

18 posts


  # 943713 1-Dec-2013 15:22
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Sorry about the formatting. It looked fine on the preview. Based on the feedback though it looks like I'm going to have to run some cat 5 or 6. I think the moral is if it ain't broke don't fix it.

JPG attached.

1250 posts

Uber Geek

  # 943719 1-Dec-2013 15:29
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While there are Many on the forums that think DLM can cure many of the worlds problems - unfortunately it will not fix yours.

DLM makes very small changes to sync rates - the only time your sync rate can dramatically change is a profile change from 8b to 17a very few people have a line good enough for 17a.

As has been suggested above get your line checked - the innbox doesn't display attenuation correctly but I believe that you can ssh into it and get the attenuation value however I don't have an inbox anymore so can't really help you out but if you do a forum search I think there may be some instructions for the inbox.

18 posts


  # 944490 3-Dec-2013 06:44
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Had a quick look around the forums and google but couldn't find anything specific to innbox via ssh. I get the following list of commands available when connecting to the router. Any info out there on which one would give me attenuation stats?



18 posts


  # 944629 3-Dec-2013 11:31
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Hi All,

Thought I'd share the following from INNBOX support...




Yes that is correct, you won't see the attenuation in the web ui, however you can get the stats of the CLI prompt.


 telnet or ssh into the Innbox and run the following command, you will get your stats reading, your Attenuation will be after U1 and just before U2.


 xdslctl info --pbParams


Keywords: innbox, v50u, attenuation, ssh 

18 posts


  # 945814 5-Dec-2013 06:37
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Hi All,

Here's the verdict on attenuation on the innbox. If I'm reading this correctly then the magic number for me is 23.5 which, frankly, sucks. All things being equal I'm assuming my next move is internal wiring.


 > xdslctl info --pbParams
xdslctl: ADSL driver and PHY status
Status: Showtime
Last Retrain Reason:    2
Last initialization procedure status:   0
Max:    Upstream rate = 4864 Kbps, Downstream rate = 17408 Kbps
Bearer: 0, Upstream rate = 5576 Kbps, Downstream rate = 14830 Kbps


Discovery Phase (Initial) Band Plan
US: (699,1178)
DS: (35,686) (1187,1629)
Medley Phase (Final) Band Plan
US: (699,1178)
DS: (35,691) (1186,1631)
    VDSL Port Details               Upstream                Downstream
Attainable Net Data Rate:            4864 kbps              17408 kbps
Actual Aggregate Tx Power:         -   7.3 dBm               13.0 dBm
VDSL Band Status          U0     U1       U2      U3      U4     D1      D2      D3
  Line Attenuation(dB):   N/A    23.5     N/A     N/A     N/A    18.2    28.5    N/A
Signal Attenuation(dB):   N/A    23.9     N/A     N/A     N/A    18.2    28.4    N/A
        SNR Margin(dB):   N/A    10.1     N/A     N/A     N/A    16.6   16.2      N/A
         TX Power(dBm):   N/A   -7.3      N/A     N/A     N/A    12.2   5.6       N/A

5595 posts

Uber Geek

  # 945821 5-Dec-2013 07:13
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With 23dB attenuation, I wouldn't have expected a go-ahead for VDSL, however, given you used to get 50Mb/s, I'd suggest something has gone wrong since initial instal and there is a physical wiring issue somewhere which has increased the attenuation.

I see Chorus have just installed a VDSL splitter etc. This should mean that your internal wiring is all sorted (there's been the odd report of an inexperienced tech getting it wrong, but they've got a lot of guys out there, so it's pretty uncommon).

If you have another modem available to try just to rule that out, give it a go, but I'd suggest raising this with your ISP as a fault, and see if they can get the line checked for you.

18 posts


  # 945954 5-Dec-2013 10:38
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I've gone back to Full Flavour with the stats from the router. Unfortunately, I've got a couple of ADSL routers lying around, but no VDSL. Could I test using the ADSL router?

Chorus didn't replace the wiring. They pulled out the original ADSL router and replaced it with a VDSL version at the entry point into the house. They also disconnected the original DSL jack point and installed one directly below the phone jack.

I'm tempted to get someone else in to bypass the existing wiring completely. The only advantage to keeping the current setup is that at the moment it's all Chorus' responsibility.

5560 posts

Uber Geek

Lifetime subscriber

  # 946030 5-Dec-2013 12:55
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Why did you not leave modem where it was and wire in the VoIP port to a secondary jack-point?

Chorus has spent $1.4 billion on making their xDSL broadband network faster and even more now as they are upgrading their rural Conklins. If your still stuck on ADSL or VDSL, why not spend $195 on a master filter install to make sure you are getting the most out of your connection?
I install - Naked DSL, DSL Master Splitters, VoIP, data cabling and general computer support for home and small business.
Rural Broadband RBI installer for Ultimate Broadband and Full Flavour


Need help in Auckland, Waikato or BoP? Click my email button, or email me direct: [my user name] at geekzonemail dot com

18 posts


  # 946080 5-Dec-2013 14:34
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I think that's what's referred to as hindsight :)

18 posts


  # 958663 29-Dec-2013 17:03
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Hi All,

Thought I'd update the next chapter in the saga My next step has been to connect the dsl router directly to the entry point at the house. Here's the result...


 > xdslctl info --pbParams
xdslctl: ADSL driver and PHY status
Status: Showtime
Last Retrain Reason:    2
Last initialization procedure status:   0
Max:    Upstream rate = 10080 Kbps, Downstream rate = 30944 Kbps
Bearer: 0, Upstream rate = 10356 Kbps, Downstream rate = 28123 Kbps


Discovery Phase (Initial) Band Plan
US: (699,1178)
DS: (35,686) (1187,1629)
Medley Phase (Final) Band Plan
US: (699,1178)
DS: (35,691) (1186,1631)
                  VDSL Port Details               Upstream                Downstream
Attainable Net Data Rate:           10080 kbps              30944 kbps
Actual Aggregate Tx Power:         -  11.3 dBm               13.5 dBm
        VDSL Band Status                U0              U1              U2     U3               U4              D1              D2              D3
  Line Attenuation(dB):   N/A    16.1     N/A     N/A     N/A    10.8    16.2    N/A
Signal Attenuation(dB):   N/A    16.0     N/A     N/A     N/A    10.9    16.2    N/A
                SNR Margin(dB):   N/A    11.2     N/A     N/A     N/A    10.9   10.9      N/A
                 TX Power(dBm):   N/A   -11.3     N/A     N/A     N/A    12.8   5.6       N/A

Subsequent tests show that Signal Attenuation is back up to the 23.9dB mark. Pretty annoying so far.

The only other thing in my control is the router. Anyone in the Silverdale area willing to lend me another for testing purposes?

18 posts


  # 965690 12-Jan-2014 20:12
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Managed to borrow another router. Same result as my one. Any suggestions on how I convince Chorus that 12meg download isn't "within acceptable parameters?"

Modem results below...

Uptime: 0 days, 0:07:37
DSL Type: ITU-T G.993.2
Bandwidth (Up/Down) [kbps/kbps]: 7,402 / 17,914
Data Transferred (Sent/Received) [B/B]: 0 / 0
Output Power (Up/Down) [dBm]: 429496724.9 / 13.4
Line Attenuation (Up/Down) [dB]: 25.4 / 19.3
SN Margin (Up/Down) [dB]: 11.9 / 12.0
System Vendor ID (Local/Remote): TMMB / ----
Chipset Vendor ID (Local/Remote): BDCM / IKNS
Loss of Framing (Local/Remote): 15 / 0
Loss of Signal (Local/Remote): 20 / 0
Loss of Power (Local/Remote): 0 / 0
Loss of Link (Remote): -
Error Seconds (Local/Remote): 61 / 0
FEC Errors (Up/Down): 759 / 1,591
CRC Errors (Up/Down): 0 / 0
HEC Errors (Up/Down): 0 / 0

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