Simplex 4100ESi Installation Manual page 53

Figure 39. Mounting a legacy card and a motherboard in a bay
Legacy cards require two retaining bars to hold them in place. The retaining bars are supplied with the bays.
Legacy motherboards in a bay share power and communications through the interconnecting pins, but are not
connected directly to the PDI backplane. The group of legacy motherboards in a bay in the expansion cabinet is
connected to the CPU motherboard in the main cabinet, or an intermediate set of legacy motherboards in
another bay for power and communications using one of the following legacy power looms:
⋅
The 733-525 Harness 4100 34 inch Power & Comms
⋅
The 733-542 Harness 4100 96 inch Power & Comms
The black and blue wire set in each loom connect to the upper header P2 on the motherboards. The black and
white wire set in the loom connect to the lower header P3 on the motherboards.
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