The CDA-2990 provides eight 10MHz clock outputs and eight PPS signals. Connect one of these 10MHz outputs to the REF IN connector on the back of each USRP you are using. Also connect one of the PPS OUT to the PPS TRIG IN on the back of each USRP. This ensures that all USRPs are looking at the same clock source, and it allows synchronization of the USRPs.Each USRP-2945/2955 also has two LO OUT connectors (IF 1 and IF 2). These should be connected to the corresponding LO IN connectors on the second USRP. If additional USRPs are being used, this connection can be daisy-chained. For example. connect LO OUT of the first USRP to LO IN of the second USRP. Then connect LO OUT of the second USRP to LO IN of the third USRP, and so on.
If you are using a USRP-2945/2955 to supply LOs to other USRP-2945/2955 devices, you may require power amplification. Using LO Reimport, the connections for Multi-Device Reimport LO Configuration are:
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