I looked at the PSL/IOO racks to check for which boards, if any, require an additional P2 interface, so that we can try and design a generic one for the IMC/CM boards and whatever else may require it. While searching the elog, I saw that Koji and Johannes had already done this, see Koji's elog in this thread. Some remarks:

1. D990155 seems to be unused in both PSL and IOO racks. The one in the PSL rack has some LEMO cables plugged in to the front panel, but they go nowhere. So I think that both of these are redundant (in the assessment below, only one was marked redundant).
2. In the PSL rack, the "TTFSS Interface", "PSL PMC SERVO", and "DAQ INTERFACE" (which I think is obsolete) cards all have their P2 connectors daisy chained together, going to a cross-connect. Kruthi and I traced this to be going to a cross connect marked "J23-PSLRACK-CCP". In the PSL wiring diagram of which we have a hardcopy in the control room, it looks like these channels are related to the RefCav? So I think this is not required to be interfaced to our new Acromag DAQ system. 

Conclusion: Only the IMC Servo and CM boards need their P2 connectors connected to Acromag.It would be helpful to remove the TTFSS Interface board and figure out what exactly the pin-mapping for the backplane connectors are, but I didn't do this today because there is a "High Voltage" line going to the Interface Board and I'm not actually sure of the signal chain for the FSS servo.