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burtz

161 posts

Master Geek


#29093 23-Dec-2008 09:10
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I have a Linksys wag54GP2 router and when I first connect I get a downstream rate of 2880 Kbps.  Within an hour or a half a day the downstream rate drops back to half that.  If I reboot the router it goes back up. Is this related to what I have been told is my high downstream line attentuation - 52 or is something more sinister at work ?

I use GDMT modulation because the router seems to have issues with ADSL2 even though the exchange has been upgraded.

It's an issue because at 2880Kbps I get a 2.2Mbps download rate when the downstream rate drops to1200-1400Kbps I only get a download speed of 1Mbps or less...

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jermsie
302 posts

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  #185783 23-Dec-2008 09:46
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There's a 15% overhead in the sync rate that must be factored in.




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burtz

161 posts

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  #185785 23-Dec-2008 10:12
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But does that explain why the downstream rate drops in half?

coffeebaron
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  #185827 23-Dec-2008 15:07
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When you first sync, the ADSL modem will pick a rate that it thinks is all good; however, as factors vary during the day, especially in the evening, there maybe more cross talk etc. The ADSL modem may then drop it's sync rate to compensate for the extra noise etc. This results in the rate progressively dropping off until a point where it is stable all the time.

It looks like you are on a marginal line. Make sure all your house cabling is in good nic and you have a master splitter installed. This will help.




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burtz

161 posts

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  #185916 24-Dec-2008 09:56
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I don't think I have a master splitter, but with naked dsl and no other phones in the house would it still be worth getting one?

Niel
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  #185947 24-Dec-2008 11:41
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It might have some benefit adding a central splitter as it isolates the rest of the wiring from your modem.  But are you sure everything else is disconnected?  Do you have Sky which is plugged into the phone line?  Do you have a monitored alarm which is hard wired into the phone line?  Both of those periodically dials out and when that is done it closes a relay to connect to the phone line which can cause your drop in speed if they are not plugged/wired in with a filter.




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coffeebaron
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  #185961 24-Dec-2008 13:10
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burtz: I don't think I have a master splitter, but with naked dsl and no other phones in the house would it still be worth getting one?

Ok, in that case a central splitter won't help, but still running a dedicated line in from the demarc for DSL (i.e. no other jackpoints), may help.




Rural IT and Broadband support.

 

Broadband troubleshooting and master filter installs.
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burtz

161 posts

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  #185972 24-Dec-2008 14:17
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Thanks I might try that, as the house is fairly new and has jack points all over the house which are a bit superfluous now ! I assume "demarc" means where the line enters the house, or do I need a new line from the green pillar in the street?



Niel
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  #185980 24-Dec-2008 14:41
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burtz: I assume "demarc" means where the line enters the house, or do I need a new line from the green pillar in the street?

It is the junction box where the line enters your home.  If you are on nDSL then everything after the demarc point is your responsibility so you can do with it whatever you want as long as it does not interfere with the exchange i.e. as long as it complies with the wiring standard.




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