hi ghayhab,
if you will be using dTRU Hybrid Combiner you will be using around 18 Rx cables between dTRU and CXU and this will include between CXU and CDU plus 9 TX cables between dTRU and CDU and 4 TX1+TX2 Hybrid Combiner cables for dTRU 2, 3, 4 & 5 (note dTRU 0 is uncombined). configure your IDB using dTRU Hybrid Combiner, then select 3+3+4 for your SCC.
goblydegook luck!