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526 posts

Ultimate Geek
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Topic # 58122 8-Mar-2010 21:54
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Hi all,
I have been having a rediculous amount of problems with my what is meant to be an ADSL2+ connection.  A couple of months ago we noticed that our phone and internet would go 'funny' (phone via 2talk) at 3.15pm almost every day of the week inc weekends without skipping a beat.  Sometimes the internet would re sync pretty quickly, other times it would take up to 2hrs to sort itself out.  The most likely thing that came to mind was ripple control (to turn the hot water cylinders etc on/off).

After toying with 2 Dlink 502Ts (1x Gen I, 1x Gen II) and a new  Dynalink RTA1320 (all with latest firmwares), numerous isolation tests, checking what home wiring I could, we decided to get the central splitter installed to isolate all the possibilities (suprisingly the 502T would sync faster than the RTA1320).

The techie came round, did his install and we tested the line to make sure it worked. Seemed ok with the Dlink, which connected just approx 5.6Mbit (was less than that before the splitter installation).  So I was a bit pleased with myself, but told the techie that it wasn't stellar performance.  He pulled out his Speedtouch ST536 and this connected about 6Mbit - so ball park what the Dlink was getting.

Day 1 after the splitter install the 502T stayed synced for just shy of 24hrs, flew through the known time problem at 3.15pm without a hitch.  But after that it started to go horribly wrong again, where randomly the connection would buckle - not at 3.15pm but whenever it felt like it!  Sometimes the connection would stay up for 18hrs, sometimes 5 mins.  Thinking it was the 502T's fault, I gave the RTA another bite - alas, it still synced slower than the Dlinks AND it still had random disconnections. 

Jumped on Trademe and grabbed a new Speedtouch ST536 v6 to add to the mix.  Initally it looked great - syncd at just over 6Mbit but when I checked it a few minutes later, the connection had dropped to 1.5Mbit and then lower again.


Now for figures: distances - I looked at the telecom wholesale website and our local exchange / cabinet thing is getting upgraded at the end of this year, I noted the code they had for it and then while driving on the main road noticed how close the cabinet is - approx 750m.

ADSL stats from the router (RTA1320)

Line Mode     ADSL2+
Line State      Show Time 
Line Power State     L0     
Line Up Time     00:06:33:40
Line Coding     Trellis On     
Line Up Count     7

Statistics         Downstream     Upstream
Line Rate         1927 Kbps     890 Kbps
Attainable Line Rate     3368 Kbps     883 Kbps
Noise Margin         20.4 dB     13.9 dB
Line Attenuation     42.5 dB     22.8 dB
Output Power         17.5 dBm     12.4 dBm

Funny that the line rate (up) is higher than the attainable line rate....

Adivce? Should I log a line fault?  Or have I gotten really unlucky with where we've moved to?  Anything else I can try?  Thanks for reading my rant!

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8027 posts

Uber Geek
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  Reply # 305566 8-Mar-2010 23:23
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The line attenuation looks pretty high, roughly how far are you from the exchange (rather than the cabinet)?

On a standard profile the noise margin is usually 12dB, so I would guess they have you on a conservative line/port profile for stability reasons because you're really far from the exchange or there is poor wiring between you and the exchange.

What area is this?

If they mistakenly have you on the wrong profile or there is a fault with the port or wiring to the port at the exchange... you could ask them to do a port reset at the exchange and put you on a standard profile. 

However, the result could be worse stability if the real problem is distance and general wiring quality issue between your house and the exchange.

The good news is cabinetisation should be awesome for your sync speed and reliability once it gets done. I believe generally they are usually ahead of on schedule on the dates listed on the maps site, so that's something.

526 posts

Ultimate Geek
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  Reply # 305589 9-Mar-2010 06:53
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Hi Ragnor,
I'm not too sure where the local exhange is. Will need to go for a drive and find it. We are in Whitby, Porirua. From conversations with Snap they thought we were about 2.5kms but they also said they weren't 100% on that.

Yep, I thought as much for post upgrade connection but not sure if the wife can cope with a phone that doesn't work when someone tries to call or when we need to make call. I guess it's already March now so Decembers not too far off? Haha - if only they are 6months ahead of schedule!

776 posts

Ultimate Geek
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Snap Internet

  Reply # 305595 9-Mar-2010 07:41
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Can you please PM me your Username or Account Number?



0800 BROADBAND (276 232)

@SnapInternet on Twitter
Snap Internet on Facebook

Our Social Media Team:
^RO Ricky - Technical Lead
^AT Ashleigh - Retail Marketing Coordinator

526 posts

Ultimate Geek
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  Reply # 305600 9-Mar-2010 07:55
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Hi Ralph, PM sent.

526 posts

Ultimate Geek
+1 received by user: 27

  Reply # 311453 25-Mar-2010 21:51
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Hey guys, a quick update on what's going on...

Ralph put me on to one of Snaps super techs and he's been hunting the problem.  My modem stats have hugely improved since the start of this story:

Line Mode           ADSL2+       Line State      Show Time 
Line Power State         L0      Line Up Time     01:08:37:44
Line Coding     Trellis On      Line Up Count     1

Statistics                   Downstream    Upstream
Line Rate                    5934 Kbps     945 Kbps
Attainable Line Rate     6732 Kbps     942 Kbps
Noise Margin                    12.0 dB       12.3 dB
Line Attenuation               43.5 dB       22.6 dB
Output Power                 19.0 dBm    12.4 dBm

Not 100% what they've ended up doing, or if this is the end result but if the connection can stay stable then I'll be a happy chappy. 

Thank you Ralph and to the team at Snap Cool

526 posts

Ultimate Geek
+1 received by user: 27

  Reply # 389913 9-Oct-2010 16:53
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So after a few months on slow interent (sync and relatively stable 1500/900 kbps) which the snap team had applied several bandaids to keep stable the local cabinet was upgraded and commissioned - w00t!

Sync speeds have increased by a huge ammount and the connection  seems to be very stable (FEC/HEC/CRC are pretty much a non-issue now too).

Via Thomson ST5x6v6 (so should have max compatibility with telecom gear)
DSL Type:    G.992.5 annex A
Bandwidth (Up/Down) [kbps/kbps]:    772 / 13,332
Data Transferred (Sent/Received) [kB/kB]:    0,00 / 0,00
Output Power (Up/Down) [dBm]:    12,5 / 0,0
Line Attenuation (Up/Down) [dB]:    6,0 / 13,0
SN Margin (Up/Down) [dB]:    8,5 / 11,5

However, testing using speedtest shows something going funny:

To keep my old connection stable I was put on a special profile (hence the mention of the several bandaids). So I thought this was the reason for the relatively slow speeds.  Called up Snap and the technician said that I had been put back on a 'normal' profile (interesting!).  We're going to try turning interleaving off (since the errors have dwindled and will give me better VoIP performance) and see if that makes any difference.

534 posts

Ultimate Geek
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  Reply # 389933 9-Oct-2010 18:20
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What computer are you doing the speed test on, something reasonably competent, not a mobile device. Ethernet or wi-fi?

526 posts

Ultimate Geek
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  Reply # 390149 10-Oct-2010 13:39
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stuzzo: What computer are you doing the speed test on, something reasonably competent, not a mobile device. Ethernet or wi-fi?

Hey stuzzo,
Have been testing using my laptop - it's fairly new, core2duo @ 2.26Ghz, winXP pro, 2GB of ram.
Testing via wifi, 802.11g, XP says the signal strength is excellent, and the graph shows full strength.

Network gear is comprised of:

  • Modem:  Thompson Speedtouch modem (acting as dumb modem) and is configured for PPTP passthrough

  • Router:  Linksys WRT54GL running tomato 1.27

Speedtest via wired connection:

Speedtest via wireless connection:

So a bit of variance but nothing major?

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