http://www.telepermit.co.nz/nl137.html Paragraph 5 makes for interesting reading, being close to an old exchange is not always a good thing. It might also explain the problem you are experiencing.
For your background, there are coils in the filter amongst other things and a coil is a wonderful thing until too much current passes through it. It saturates the core with magnetic fields and suddenly does not do it's job any more. That is also why you should not have many phones plugged into one filter. And when you pick up or put down your phone, there is a brief in-rush of current especially if the phone is older. This in-rush current can saturate the coil core and cause your modem to disconnect.
Also capacitors change value over time, I would not use a filter if it is more than 5 years old.
A central splitter has coils with larger cores which take much more before it saturates (can handle many phones on a line), that is why they are better than a normal line filter. When you change over to ADSL and you get a "wiring charge" of $150, then this is what they install.
The AC Neilson HomeScan system I've mentioned in another post supply their own filter and say they had trouble with most other brands. Unfortunately there is no brand name on it.
I've noticed that PTC280, the standard for customer fitted line filters, was drawn up in March 2001 but is still an interum specification. It is yet to be replaced with a proper specification, so the line filters we buy are approved against a specification that 6 years old and still classified as interum!
Well, this old man needs to go to bed early. In 2 hours my wife will be back from Australia and bringing me a D-Link DSL-10SP central splitter. In AU you can buy it anywhere, in NZ it is "no longer available". There can only be one company behind that, the same one that charges a "wiring fee"...
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