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Topic # 114171 11-Feb-2013 00:05
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Hi all, first post after lurking & searching.. 

In a nutshell, I was looking at upgrading the TG585 v8 that Telecom supplied - but trialling a couple of alternatives has not really yielded much joy - in fact, stats & speed wise (all other factors being equal) it's a step backwards so... I was wondering if there are any settings that I should be checking into to make sure I'm not missing something vital?

TG585 V8 stats
ITU-T G.992.5; 
downstream: 13275 kbit/s, 
upstream: 1033 kbit/s; 
output Power Down: 17.5 dBm, 
Up: 12.0 dBm; 
line Attenuation Down: 5.0 dB, 
Up: 3.0 dB; 
snr Margin Down: 12.0 dB, 
Up: 12.0 dB

On speed test I get around 11M down and 0.8M up - ish.

Changing to an alternative unit (I'll leave the model out of this discussion for the time being*)
downstream: 7612 kbit/s, 
upstream: 921 kbit/s;  
line Attenuation Down: 8.5 dB, 
Up: 2.5 dB; 
snr Margin Down: 17.0 dB, 
Up: 11.5 dB Speedtest shows about 6M down 0.6-0.7M up - ish.

As mentioned, all things infrastructure wise, are equal (same port, same cable, even the same power point the router gets plugged into) but I am fairly certain that I'm missing something in the setup of the router somewhere. I've matched all of the settings that I have for Telecom and the TG585 (eg user, password, dns settings, making sure its G.992.5 Annex A). I'm a bit clueless in general, but not a total novice and I've double-triple checked I have what I know to be right is right on the new router. 

So I guess my query is two fold.
1) Is it just down to the fact Telecom have control over the provisioning of the TG585 that you can expect better performance (as its a known quantity / works with their network better)? or;
2) Should I expect at least similar stats / speed with any ADSL2+ device if set up correctly?

I'm guessing the latter and hence I've probably messed up a setting somewhere - any tips for buried settings I should check etc?

Oh, couple of other bits of info to note if helpful. I'm in an ADSL2+ / VDSL location (Cabinet TIS/V from what I can tell), and we have a master splitter installed which is currently being run to single jack which is the first point after the demarc in the basement.

Thanks in advance

(* mainly as I'm not asking for specific vendor configuration guidance per se, more a general 'good practice' settings checklist which can be applied to any potential brand of router..)

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  Reply # 759260 11-Feb-2013 02:38
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You should expect some variation line rates between different brands/chipsets but that looks like a well known issue.... The alternative modem's speed looks suspiciously like a firmware bug seen in certain older modem chipsets when interacting with the IKANOS lines cards Chorus use for xDSL.

The Telecom supplied Thomson will be using a common Broadcom chipset that has no problem with the newer line cards.

TP Link, Dynalink/Netcomm, Thomson generally use Broadcom chipsets in their modem/routers.

There are other modem chipsets like Texas instruments, infineon, connexant. Some of the early Vodafone Huawei HG DSL modems had the same problem (capped and 7xxx line rate) with the new line cards until they fixed the firmware.

Check for firmware update for the alternative modem to fix the issue. If it's too old there won't be one and it's best to ditch it.

No harm in naming the alternative make/model really /imo.

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  Reply # 759274 11-Feb-2013 06:16
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The other modem you have is only syncing at ADSL1 speeds - either because it's set to this, or because it's a known device that has issues and does this such as a number of D-Link or come Linksys units due to firmware issues.


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  Reply # 759405 11-Feb-2013 12:10
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Thanks for the replies. I'll investigate the firmware, am fairly sure one of them is on the latest but the other one is probably older, the one that's up to date might be a write off by the sounds of it. If all else fails I'll probably look to grab a Netcomm as it seems to be a known quantity. If I stumble upon a miraculous fix then I'll post up & advise.

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  Reply # 759413 11-Feb-2013 12:29
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Draytek Vigor 120 is one of the most stable ADSL modems you will get. Bridge it to the router of your choosing and you will have a great set up. And then when UFB comes remove the 120 and plug your router in to the ONT.

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