Kitz Forum
Broadband Related => ADSL Issues => Topic started by: setecio on November 19, 2007, 10:37:43 PM
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If I switch my adsl modem off every night when i go to bed, can this affect my longterm adsl speed ?
Can this nightly process affect my speed in a negative way by somehow affecting the ISP's and BT's technology that supplies the broadband, and the various profiles or settings that they have for me somewhere in their system ?
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No, it shouldn't have any effect, negative or otherwise.
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Roseway's right... doing that is absolutely fine - if you don't use the modem overnight there's not much point in it being on! So no problem with turning it off at night.
There's a couple of things you might like to know for future reference:
1. BT's DLM technology they use to try and regulate the line stability doesn't like too many resyncs in a short space of time (i.e. disconnecting, turning the modem off and on again). As I said above once a day will not affect this though, but several times per hour will - I don't think anyone outside of BT wholesale knows the actual thresholds though.
2. Some people say that if you get stuck with a slow BRAS profile, then turning your router off overnight for a few days can spur it back into life again... for me the jury's out on that one but it doesn't hurt to try.
Unrelated really to your original question, but it might come in useful ;)
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I turn my modem/router off every night and it has caused me no problems at all. Indeed, when I used to leave it on overnight I had slightly slower speeds than I do now I turn it off. This seemed to be because of some noise effect which happened quite often about 4 or 5am (some local business or other big user switching things on??). Now that I turn off each evening my BRAS profile is 500 higher than if I leave it on all the time. You must beware of turning on and off too frequently in too short a time however in case this is mistaken by the system as a fault on your line.
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OK, thanks for that info.
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I never turn the modem off, never had a problem with it, the only annoying thing is the lights on the front of it,
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Thanks Jazz. I noticed that effect too. Its nice to have an observation confirmed. Speed takes a dive between 1600 and 1700 hours and doesn't recover, no matter how long the router is left on. Switching the router on at 0800 hours definitely restores the speed which tends to hold up until teatime. After reading this thread, I am now switch the router off last thing at night. :'(
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Just a quick point here, on lower quality lines (like mine), if I was to to turn off my router overnight and start it when i came in from work, I would synch at a lower rate than I would than if I started it during the day thus lowering my IP profile.
so for me its beneficial to leave my router on once I have a decent synch speed achived during the day.
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Sorry to jump in,
but I lose sync every night between 4.00 and 6.00, router resyncing from 4 meg to 1meg.
Could I just turn the router off for this time, avoiding the low sync?
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It wouldn't do any harm. But there's no guarantee that you'll get a higher connection speed after 6 pm, because it's quite normal for there to be more interference in the evening than in the daytime. Suck it and see, I suggest.
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I just realised, that anyone using USB modems, will turn them on and off every time they turn their computers on and off.
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One of the many rasons to ditch your USb modem in favour of a router
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>> I just realised, that anyone using USB modems, will turn them on and off every time they turn their computers on and off.
A usb modem when attached ot a PC has a proper shut down request so that the dslam knows its not a loss of signal. Sorry I cant remember the correct term but something like "last gasp" or dying gasp that occurs during a proper shut down procedure.
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"something like "last gasp" or dying gasp that occurs during a proper shut down procedure."
Kitz, you got it right!
Supports Dying Gasp during orderly shut down of the operation system
from:
http://www.draytek.com/product/adsl_router_modem/vigor318/vigor318.php
dave
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Thanks dave. Yep thats it - couldnt remember off top of my head if it was last gasp or dying gasp
(I was obviously too lazy to google) :lol:
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Hi
Came across a document from BT Wholesale entitled 'Broadband Max Myths and Legends' Oct 2006, which I thought a useful document. It had this to say on rebooting routers
How many times can my line retrain per day before DLM acts?
This is a BT Wholesale configurable parameter, but currently if a line retrains more than 10 times in any single hour period DLM will take action.
It is therefore inadvisable to manually retrain a line more than 10 times in a single hour as DLM will interpret this as line instability.
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Whoops - forgot to put in the link to Myths and Legends
http://www.thinkbroadband.com/files/broadband-max-myths-and-legends.pdf
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I didn't do anywhere near 10 in an hour before DLM kicked in on my line!!
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>> I didn't do anywhere near 10 in an hour before DLM kicked in on my line!!
hmmm... the night I had an electrical fault it only took a couple of resyncs at a lower figure before mine kicked in too.
It certainly wasn't 10... and this is on a line that prior to that, continually sync'd at 8128 for about a year.
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Deffo a myth. Mine got kicked by three short power interruptions in an hour.
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I can't remember what I read about the effect of this ..... if that happens does it :
) permanently lower your speed
) temporarily lower and adjust back up within a few days / hours
) not actually lower your speed but lower BT's indication of what your speed should be and affect your ability to complain ?
) or something else ?
Thanks.
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For a full explanation look at http://www.kitz.co.uk/adsl/maxdsl2.htm but briefly the DLM process controls interleaving and the target noise margin. Interleaving is very commonly applied to help to stabilise a line, and has little or no effect on the speed, but does increase the latency. Increasing the target noise margin results in a lower connection speed with increased stability.
The target noise margin is supposed to come back down again automatically if the connection is stable for a length of time, but this process doesn't appear to work very well. Both interleaving and target noise margin can be adjusted manually if your ISP is willing to push BT to do it.