Potential speed increase with FS/FS and ADSL2?

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mch_nz

53 posts

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#26136 12-Sep-2008 22:34

I've just found out that changing my current plan from FS/128 should increase my current download speed depending on line attenuation and the SNR margin. My DL502T is showing connecting at ADSL2+ so it looks like it might be time to upgrade my plan first and then maybe the modem.

Can anyone give me an idea of the speeds I could expect if I upgraded to FS/FS? Currently I'm getting:

Item	Downstream	Upstream	Unit
SNR Margin	12	31	dB
Line Attenuation	43	27	dB
Data Rate	3998	165	kbps

And what about if I get the Linksys WAG160N? Will this improve the ADSL2+ performance?

Thanks,
Mark

cyril7

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#164162 13-Sep-2008 10:11

Hi, normally a 128k uplink will limit the down to around 4.5Mb/s due to the rate at which ACKs can be returned, so based on your sync rate there may be little advantage in either moving to ADSL2+ nor FS/FS.

Typically over 40-45dB attenuation ADSL2+ shows no speed increase over ADSL1 and often behaves in a less stable manner.

That said, for you attenuation and noise margin you should expect potentially better sync speeds than you currently have, a figure closer to 6Mb/s should be possible. Things to look at are your home wiring, investing in a central filter may be worth while, and different modems work better. The WAG160 is supposed to be a good router, but as with most Linksys modem the ADSL part leave a lot to be desired. I would go for a modem with a Broadcom chipset in it for longer lines, this includes TP-Link, DynaLinks, and most DSE routers such as the XH9949 and XH9950, these latter two are both TP-Link rebadges and I have had very good success with them especially on longer lines, and well priced.

Cyril

Edit just changed the above from Dlink to DynaLink. Dlink dont use Broadcom chipsets Dynalink do.

mch_nz

53 posts

Master Geek

#164179 13-Sep-2008 11:46

Thanks Cyril,

so my best bet would be to look at the the modem and wiring first and see if I can get that up to 4.5Mb/s? And then look at upgrading to the fs/fs plan?

Cheers,
Mark

eXDee

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#164184 13-Sep-2008 12:01

Yes. Central Splitter first if you have bad/a lot of wiring, then look at changing plans.

Bung

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#164191 13-Sep-2008 12:12

My 502T showed ADSL2+ but never more than 7.6Mbps line speed or just over 3Mbps download. A Thomson 536 went to 11Mbps line speed and at the right time will show a bit more than 4.5Mbps download. Flash based tests even higher ???

Overall this isn't noticable day to day.

cyril7

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#164198 13-Sep-2008 12:38

First generation Dlinks (like the 502) would indicated they were on ADSL2+ but not give more than 8Mb/s, this was a known issue, 2nd gen fixed this (I think), regardless gives you good reason to avoid.

That all said, 3.5Mb/s on 43dB attenuation is a bit under par, things attenuation and noise margin dont indicate is issues related to nodal echos in your house wiring due to star stubs producing echos, this can cause various bins (carriers) and groups of bins to get distorted and therefore not used thus producing a lower sync rate than should be possible. The only solution to this is to use a central filter, even using micro filters on each and every phone point will not help this issue.

Cyril

mch_nz

53 posts

Master Geek

#164206 13-Sep-2008 13:13

Thanks everyone for your help. I'm a bit confused about the central filter though. Our broadband was originally wired for one jackpoint, I think the technician installed a splitter or something. Is this the same as a central filter or do I need to do something else?

Cheers,
Mark

wh0beme

58 posts

Master Geek

#165955 21-Sep-2008 11:29

cyril7: limit the down to around 4.5Mb/s due to the rate at which ACKs can be returned

Is it possible to change the length of time when the ACKS are sent to a longer period so you can get more speed without upgrading to FS/FS?

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SightUnseen

130 posts

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#165957 21-Sep-2008 11:35

Hold on people. Are the figures above sync rates or data rates? You may want to re-visit your replies.

eXDee

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#165972 21-Sep-2008 12:10

mch_nz: Thanks everyone for your help. I'm a bit confused about the central filter though. Our broadband was originally wired for one jackpoint, I think the technician installed a splitter or something. Is this the same as a central filter or do I need to do something else?

Cheers,
Mark

You already have one then. Hmmm, you must be on a long 3-4km line.

mch_nz

53 posts

Master Geek

#166034 21-Sep-2008 14:21

eXDee:
mch_nz: Thanks everyone for your help. I'm a bit confused about the central filter though. Our broadband was originally wired for one jackpoint, I think the technician installed a splitter or something. Is this the same as a central filter or do I need to do something else?

Cheers,
Mark

You already have one then. Hmmm, you must be on a long 3-4km line.

Yep. And I read in the local paper that we aren't scheduled for cabinetisation until 2011... So would one of the Broadcom chipset modems be worth while getting? Or would the FS/FS make a difference? Or should I just wait and cope?

Cheers,
Mark

Batman

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#166362 22-Sep-2008 19:37

w fs/128 i got 4mbps/130kbps and torrent downloads (if that's what you mean) of 100kBps
w fs/fs i get 9mbps/600kbps and torrent downloads of 250kBps