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The second ground is on pin 3. This is also connected to the power supply's 0V output. This
ground is connected only to the metal lugs of the sockets on each module, and therefore the
panel itself, and nothing else on the module. This way it is impossible for any signal return
currents to travel down the inserted patch cords since the panel is isolated from the system
ground except at one point, the PSU.
MOTM modules can be modified to allow full Oakley compatibility although this should be
done as you are building the module. Modifying a completed MOTM module is possible, but
the reverse side of the PCB must be accessed so that you can cut the required tracks.
However, note that the MOTM and Oakley power systems are still compatible. Any Oakley
module will work in a MOTM system. And MOTM modules will work in an Oakley system –
the only downside being that some of the benefits of a two ground system are increasingly lost
as you add more MOTM modules to the mix.
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