said by dillyhammer:said by JenSuisUn:When VDSL was installed a POTS splitter should of been installed for you. This would have automatically filtered your line.
Martin, would adding a second inline filter like that, to a line that is already filtered by a POTS splitter, cause the problems reported?
Mike
A DSL filter (POTS spliter, inline, or NID, doesn't really matter which type) is a low-pass filter with a 4kHz cutoff. Voice service uses 0-4k, DSL uses higher frequencies, usually 30k and up. In a perfect world, and with a perfectly functioning filter, the strength of frequencies that pass through the filter will attenuate very quickly such that once you're in the range that gets used by DSL nothing's getting through. In reality, perfect filters don't exist but they're usually good enough.
You can have any number of filters in line, and it shouldn't affect your service at all, though ideally it's completely unnecessary. Unless, as Martin says, you've got the filter on the modem... then unless you have a defective filter you won't have any service at all. Increasing the number of filters being used also increases the chance of having a defective filter which introduces a short on your line, which may or may not affect the DSL.