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There was already an ADSL2+ splitter in place put their by the alarm installer, sending phone down the orange pair and DSL down the blue pair, which the chorus installer swapped. However the ADSL2+ splitter has not been replaced. The chorus installer said they "are the same" and tested it at the cabinet and confirmed it was working - which it obviously would regardless of what you put in there.
However this concerns me, because of cyril's post from 2010:
cyril7:
Hi, the lattest spec for the new VDSL2 compatible filters requires that three ports are supplied rather than two as in the old spec. If you open most of these new filters you will find the line and DSL port are infact the very same point. The standard does allow and potentially some compliant filter designs allow for a high pass section between the line and DSL port, but all the ones I have tested appear to have only a LP section between the line and phone port and the line and DSL port are the very same point.
The old ADSL filter (MM3200B) supplied only a line and phone port, therefore you needed to make a double termination of the line port to provide the DSL from the same port, these newer VDSL2 filters simply give you a third wire port to make is easier to termiate the DSL connection.
Obviously these new VDSL2 filters are also rated to 30MHz where as the older ADSL/2+ filters are only rated to 2.2MHz, hence only ADSL2+ capable.
As of now there will only be a small remaining stock of the older ADSL2+ filters and only the newer VDSL2 capable filter (as you have a photo of) should be available. These filters are obviously rated for ADSL/ADSL2/ADSL2+ and VDSL2. And if you use one of these filters you run the DSL port to a dedicated socket just for the DSL modem, and the rest of you phone sockets in the house connected to the phone port, so you no longer require inline filters on each phone socket.
The bolded bit is quite concerning. There is no POTS on this line but i want the best VDSL conditions possible.
Thoughts?
