Tega, Ross, Jim, Dave:

here is an overview of the signal flow to get the OMC DC-PD signals from the corner station to the SUS-PI models at the end stations. For example, lets take the ETMX system:

h1lsc0 front end computer:

h1omcpi model (running at 64kHz). The OMC DCPD A and B ADC signals are downconverted into four pairs of I and Q phase signals. These 8 signals are transmitted out of h1omcpi as local SHMEM IPC channels.

h1omc model (running at 16kHz). The 8 SHMEM IPC signals are received, and MUX'ed to a single channel. This channel is split and sent out as an RFM channel on the X and Y RFM loops.

h1iscex front end computer:

h1pemex model (running at 16kHz). The RFM signal is received, and sent through a 1-to-8 DEMUX. The time delay of 1 cycle is compensated for. The resulting 8 signals are sent as 8 Dophin PCIe IPC senders.

h1susex front end computer:

h1susetmxpi model (running at 64kHz). The 8 Dolphin channels are received and upconverted.