IBM N Series Hardware Manual page 40

Figure 2-8 shows the front view of the N3400 controller module.
Figure 2-8 Front views of 3400 controller modules
Figure 2-9 shows the back view of the N3400 controller module. In the rear panel both
clustered controllers and stand-alone controller options are available.
I
Figure 2-9 Comparison of N3400 configurations
N3400 has one SAS expansion port per controller with one Alternate Control Path (ACP). If
you need to attach the EXN3000 shelf to the controller, you can configure the shelf ACP
during the setup process. Doing so enables Data ONTAP to manage the EXN3000 on a
separate network to increase availability and stability. The ACP is shown in Figure 2-10.
Figure 2-10 N 3400 communication ports
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IBM System Storage N series Hardware Guide