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On Sun, 13 Nov 2011, Martijn Grooten wrote:
On Sun, Nov 13, 2011 at 6:53 PM, Gordon Henderson wrote:Sounds like electrical interference from something on a timer.... or Street lights? your own house lights going on? Central Heating? Cleaners in a nearby office? Local radio station "pumping up the volume"?I think the first three are ruled out by the fact that it starts more or less at the same time every day, regardless of the season/temperature. There's no nearby office, nor a radio station that I know of. Could, of course, be something someone else is doing in our flat (though something on a daylight-saving-time-agnostic timer, which makes it pretty weird). Would it be worth moving the router around (e.g. to a different room) to see if that makes a difference? Or is the problem likely to be further upstream?
You could try moving it - however, you'll need to extend the line from the master socket using some cat5 cable and make sure that nothing else is plugged into the master socket (well, initially nothing else - ultimately if you have phone extensions they'll need to be plugged in) I'd not use a long modem to socket cable - have seen some of these give issues in the past.
The AM radio thing might be handy to see if these is any electrical noise though. ADSL runs typically at a carrier frequency from some 300Khz to about 1.1MHz - and that's right in the middle of AM radio (500KHz-1.6MHz)
So if it only happens for a short time at regular times, then I'd still look for something on a timer - even in a neighbours flat. Hard to work out what though - a dodgy fluorescent light on a timer perhaps?
Can you trace the incoming BT lines - from a pole or underground - if overground then to the pass some dodgy neighbours flat.. (or a perfectly good neighbour with some dodgy kit on a timer :)
etc. Gordon -- The Mailing List for the Devon & Cornwall LUG http://mailman.dclug.org.uk/listinfo/list FAQ: http://www.dcglug.org.uk/listfaq