(1) 750 MHz LO to the 720/30 MHz downconverter
(2) LCP & RCP signals from GBT as inputs to the 720/30 MHz downconverter 
    LCP/CM10 (leftmost) goes to downconverter A (leftmost)
    RCP/CM14 (rightmost) goes to downconverter B (rightmost)
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(3) 30 MHz LO to the baseband mixer
(4) LCP & RCP outputs from (2) as inputs to the baseband mixer
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(5) 5 MHz clock frequency to the NAIC PFS (pfs1, top unit at GBT)
(6) 1 PPS signal to the PFS
(7) I-Q outputs from (4) as inputs to the PFS via filters (8)
    sIne goes to I, cQsine goes to Q
    LCP inputs go to PFS1A (rightmost)
    RCP inputs go to PFS1B (leftmost)
(8) Mini-Circuits BLP-1.9 lowpass filters (light blue, BNC type)


Summary:

    LCP                       RCP		 
    CM10		      CM14	 
    down A		      down B	 
    BB 			      BB 		 
    PFS rightmost	      PFS leftmost