I have attempted to install an MM3200B Central Filter but despite a dial tone through it my modem would notget a dsl connection.

A bit of back story:

My modem is a Linksys WAG200G with which I get a tolerable connection but fairly regular droputs (modem thinks its connected, status lights green but nobody's home).  General performance stats below (connected to Vodafone's Red Network, cabinetisation due by April 2011).

DSL Status: Connected
DSL Modulation Mode: G.dmt
DSL Path Mode: Interleaved
Downstream Rate: 4640 kbps
Upstream Rate: 928 kbps
Downstream Margin: 9 db
Upstream Margin: 11 db
Downstream Line Attenuation: 33 db
Upstream Line Attenuation: 9.5 db
Downstream Transmit Power: 11 db
Upstream Transmit Power: 18 db

Apparently this is a known issue with this model but one of the suggestions with any connection issues is to clean up the internal wiring.  My phones are wired through a C-Net distribution hub that branches out through the house so there are a significant number of jackpoints and at least 6 phones/faxes connected (all with filters).  An obvious move seems to be to move to a Central Filter to reduce the possible influence this system has on the dsl connection.  I picked up the recommended Marque Magnetics MM3200N at MasterTrade.

Wiring seems simple enough - connect the incoming line and the ADSL line to the orange/white wires at one end and connect the downstream phones/CNet hub to the blue and white wires at the other.  I did this inside the CNet hub as there was already idc connectors for an adsl point in the hub so I just moved the incoming line over to those, added the orange/wite filter wires and then connected the blue/white filter wires back to the incoming line position.

The phones immediately started working again but the modem would not make a connection.  Swapping the line back to the incoming position and switching back to a jackpoint connection for the modem immediately fixed the problem.

I can't see how I'm doing anything wrong.  Anyone have any ideas?