Delta Computer Services

ADSL Issues / Microfilter problems

Problems using telephone equipment on a broadband line may be due to inferior microfilters.

We have received reports of problems using ordinary analogue telephone equipment on broadband (ADSL) lines. This includes, but is not limited to, products we sell. In every case so far, the problems have been associated with ADSL microfilters.

Your analogue telephone equipment should work after the microfilter on an ADSL line exactly as it would on a non-ADSL analogue line. If it does not, then it is probably not the equipment that is faulty, but almost certainly the microfilter.

You would think that all microfilters would be the same in performance, if not in detailed design, but this is not so. Refer to this web page at ADSL Nation for some comparative reviews of microfilters (opens in new window).

We have also been advised that, where there are extension sockets, it may be necessary to have a filter at each one even if the master socket is filtered.

Buy a top quality microfilter.