Setting up in a new place and feeling security conscious, got a monitored alarm. The nice folken at thesecurity company offered to install an ADSL splitter to obviate interference from the intrawebs with the alarm and vice versa at a reasonable price, so went for it. I wasn't there at the installation. When I had my last splitter installed, it had it's own jackpoint and I didn't have to use any microfilters. Couldn't find the jackpoint this time, called the installation technician about it, who said that he'd definitely installed a splitter but no jackpoint and still need microfilters. I thought I'd go away to check my understanding of filters and splitters etc again.
It sounds like he's installed a splitter for the alarm (i.e. isolating the alarm from the phone line and DSL), but not a DSL splitter, which I would have thought should have isolated the DSL line, thus obviating the need for microfilters (as long as a jackpoint is installed I guess). Thoughts? 'ADSL splitter' is on the invoice, and mewondering I haven't got one of those!