Prerequisites:
For each fail-open configuration, you will need to make sure you have all these components.
Determine the IP address for the fail-open switch or, if you are deploying multiple switches, a range of IP addresses
Determine a network mask and the default gateway for the fail-open switch
4 cables to connect the fail-open switch and the Sensor
An RJ-11 RS232 cable to access the fail-open switch CLI
2 SFP, SFP+, or RJ-45 cables for NS3x00, NS5x00, NS7x00, NS9x00 Sensors
Cables for a copper fail-open switch
2 CAT5e cables (1 cross-over, 1 straight-through) for network ports
2 CAT5e cables (straight-through) for monitor ports
Cables for a fiber fail-open switch
2 LC fiber cables for network ports
2 LC fiber cables for monitor ports
Broadly, these are the steps you will need to follow to set up a fail-open kit.