The Allied Telesis range of Fast Ethernet media converters provides a complete family of conversion devices, allowing users to extend the size of UTP networks with the use of fiber cabling. Supporting both SC & ST fiber connectors, the converters can be used to extend networks with up to 40km of single-mode fiber. The Missing Link feature enables the fiber optic ports on the media converter to pass the ' Link' status of their connections to each other. When the media converter detects a problem with one of the ports, such as the loss of connection to an end-node, the media converter shuts down the connection to the other port, thus notifying the node that the connection has been lost. The media converters feature auto MDI/MDI-X, allowing the converter to be connected to either a PC, hub or switch with a simple UTP cable. The media converters also allow the installer to test the integrity of fiber connection, by forcing the converters to communicate over the fiber cable. This ' Link Test' feature allows installers to check for cable faults without the need for expensive fiber optic test equipment.