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1253 posts

Uber Geek
+1 received by user: 160


Topic # 13716 25-May-2007 11:57
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Ok guys, put your Sherlock hats on for this one, I've got a mystery to solve.

Here's the situation, a club has a DSL (through Orcon) at thier clubrooms on an airfield. This is connected oddly enough to a computer. People have complained that they often cannot get on the internet. Whenever I am there it magically works. I'd always put it down to just flakey DSL (I use cable myself). The system runs a weather station and uploads data to the net, I don't check that much but others have said sometimes the data is old.

On Wednesday night after more complaints I decided to go add some more ram, and a web cam I had, Once again, system was working perfectly, I added the ram, and pointed the cam out the window.

Thursday morning I took a look at the cam and the weather at 9:30am, all working sweet. I looked again at 12pm, and to my surprise the last cam and weather update was at just after 10am. At 6:20pm it still wasn't updating, so I figured somebody must have switched off the PC or it crashed or something.

So I drove out there and arrived at just after 7pm. Of course, the computer was running fine, and had just updated the web files! I checked the webcam software and it had snapped pictures all day, so the system wasn't crashed or off, the FTP log of the weather stuff showed it attempting to update but not connecting. The system must have dropped it's DSL between 10am and 7pm.

Today, everything fine until 9:30am, now it's gone again.

So,what could cause an otherwise correctly setup system, which is on 24/7, to lose it's DSL for a number of hours a day? The only thing I can think of is some sort of interference on the line from electrical equipment or something that is getting turned on in the morning and off at night, but unless that equipment is directly connected to the line, I can't imagine it's very likely, and what equipment that is connected to the line would do that and only be switched on during the day?




---
James Sleeman
I sell lots of stuff for electronic enthusiasts...


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325 posts

Ultimate Geek
+1 received by user: 7


  Reply # 72193 25-May-2007 12:14
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 Office phone exchange or fax connected to the same phone line (maybe in another building) would be my bet. Otherwise look at the ADSL router log, if it has one. Servers Alive is useful for monitoring remote servers.

dan

967 posts

Ultimate Geek
+1 received by user: 88


  Reply # 72247 25-May-2007 18:22
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Orcon's site shows the number of disconnections per day next to the usage



1253 posts

Uber Geek
+1 received by user: 160


  Reply # 72251 25-May-2007 18:48
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numfarr: Office phone exchange or fax connected to the same phone line (maybe in another building) would be my bet.


Maybe, there is an extention in another building which I supplied a line filter for, but I guess they may not have installed it. That said though, I would have thought an unfiltered device would only cause a problem when it was actually off-hook, not all the time? I'll have to go have a look at that extention.




---
James Sleeman
I sell lots of stuff for electronic enthusiasts...


325 posts

Ultimate Geek
+1 received by user: 7


  Reply # 72255 25-May-2007 20:09
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 Fax machines especially can do odd things to unfiltered lines even when they are not off-hook. They're not designed for the high frequencies so what looks like an on-hook open circuit to voice frequencies can be a low impedance to DSL frequencies.
Even if there is a filter in place I would try another filter.

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