This board allows you to cleanly hook up your MTH TIU to your track in Passive mode. The issue is typically just hooking up the TIU outputs to the track the DCS signal strength suffers. It was identified by others on the forum that a 22uh Choke put before the DCS signal to help clean up the incoming power solved this problem and, in some cases, had better signal strength than the standard Active mode hook up. The board also features: Power LED- Lets you know when power is applied if the board is in a visible location TMCC/Legacy Hookup- a convent spot to tie in you TMCC or Legacy signal NOTE this does nothing to improve the TMCC/LEGACY signal DCS signal indicator- There is now also a second Red LED that will blink any time a signal is sent from the TIU to the track. this is a fun additional blinking light that could be used for simple troubleshooting confirming that the TIU is sending signal to the track. There is also a sensitivity adjuster to allow you to tune the light for your specific TIU TVS Diode Power Choke- The board itself is rated to handle a constant 20A of Power. The Choke has a saturation current of 14A. The maximum current rating of the coke is 28A. This does NOT increase DCS signal only helps keep the power clean for use in passive mode, If you have bad signal in Active Mode there is no guarantee this will help For more information on using the TIU or WTIU in Passive mode I highly suggest looking at information on the OGR Fourm