The versatile mixed-media network modules can have up to two fixed LAN interfaces and two user-configurable WAN interfaces. The fixed LAN interfaces reside on the main board and can be used in one Ethernet configuration, two Ethernet configurations, or one Ethernet and one Token Ring configuration. The first Ethernet port supports 10BaseT and AUI connectors while the second Ethernet port supports 10BaseT connectors only. The Token Ring port supports 4- and 16-Mbps ring speeds and STP and UTP interfaces.