The AD9116 labels its ports I and Q. The mapping of FMC-BB-4DA analog outputs (labeled A, B, C and D on the PCB) and actual DAC ports is listed in the table below.

||= DAC Output =||= IC =||= Port =||
|| DAC A || U3 || Q Port ||
|| DAC B || U3 || I Port ||
|| DAC C || U2 || Q Port ||
|| DAC D || U2 || I Port ||