Gigabit Ethernet ports on Sensors require the connection of an optional optical bypass switch and controller card for In-line Fail-open functionality; no extra hardware is required for In-line Fail-closed mode. This hardware is contained in the Optical Bypass Gigabit Fail-open Kit, sold separately.
For more information on hardware connection, see Trellix Intrusion Prevention System Fail-Open Kit Product Guide. And, for more information on port configuration, see Configuring the monitoring and response ports of a Sensor.