The appliance includes a bypass feature for inline mode. In a power failure, a relay closes and the input and output ports become electrically connected. This feature allows the Ethernet signal to pass through from one port to the other, as if the appliance were not there. The appliance functions like a cross-over cable connecting the two ports.
Besides a power failure, any failure of the appliance hardware or software also closes the relay. When the appliance is restarted, the bypass relay remains closed until the appliance is fully initialized, maintaining network continuity at all times. This feature is automatic and requires no user configuration.
When the bypass relay is closed, the bridge ports of the appliance are inaccessible.