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27th March 2014, 09:46 AM #1
Faulty ADSL Filter Injects Noise into Line Side
Faulty ADSL Filter Injects Noise into Line Side
I just changed from cable internet to ADSL2+ .
Three phones plus modem in the home.
Pulled my hair out trying to reduce what I thought was ADSL noise getting into my phones.
Eventually found that a D-Link C10245E splitter filter on one phone was injecting noise back down the line into other phones, whilst still working as an ADSL filter on the fitted phone!
The noise sounded quite like ADSL noise, only slightly harsher and not interrupted, and could not be heard on the fitted phone, only on the other phones.
Opened up the filter expecting to see passive components; there are four active devices, (and about 50 other components on the board)!
Lessons - With faults of this type, always do an "Isolation Test" meticulously, and expect the unexpected.
Oh, and by the way, if you have ADSL2+, make sure that you use quality ADSL2 filters (not ADSL filters), as the cheapies will just give you trouble, and are a waste of money. (Yes- I know the C10 is ADSL only).
cheerio, mike
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27th March 2014 09:46 AM # ADSGoogle Adsense Advertisement
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31st March 2014, 10:21 PM #2SENIOR MEMBER
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Installing a central splitter is way better again.
Semtex fixes all
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4th April 2014, 11:00 AM #3
A house filter would be fine, except that I would have to pay for it.
I have quite a few leftover smaller filter/splitters as a result of my kids leaving home, returning home, leaving home ...
mike
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8th April 2014, 09:53 AM #4Hewer of wood
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Interesting finding.
My ISP tech support advised regularly replacing the inline filters. Now I can understand why.Cheers, Ern
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