Baseline BL-ETH-SW Ethernet Switch - When there are multiple devices that require an ethernet connection, an ethernet switch should be specified along with Baseline controllers and systems. To determine whether an ethernet switch is required, count the number of devices in an enclosure that have an ethernet port. If more than one device has an ethernet port and only one ethernet connection is available, an ethernet switch is required. The Baseline SubStation, BaseStation 3200 controllers, Ethernet Radios, and Wi-Fi modules all have ethernet ports.