Dell EMC PowerEdge R740 Installation And Service Manual page 161

Figure 118. Cable routing – 8 x 3.5 inch drive backplane with adapter PERC
1 backplane
3 backplane signal cable (BP: BPSIG1 to MB: BPSIG1)
5 adapter PERC
7 SAS B cable (BP: BP SAS B0 to MB: J_BP_SIG1)
2 backplane power cable (BP: BP1 to MB: BP1)
4 system board
6 SAS A cable (BP: BP SAS A0 to MB: J_BP_PWR_A1)
Installing and removing system components 161