Allied Telesis'' AT-MC1004 Gigabit Ethernet media converters extend the reach of Gigabit Ethernet networks through the use of multi-mode and single-mode fiber-optic cabling. By converting 1000T copper connections to 1000SX or LX connections, these Gigabit Ethernet media converters can extend segment lengths up to 10km. Although the provisioning of Gigabit Ethernet connections is becoming relatively inexpensive, thanks in part to the availability of lower-cost copper Gigabit network adapters, the distance limitations of copper cabling make fiber segments a necessity in most networks. Small, comparatively inexpensive copper to fiber Gigabit Ethernet media converters present a simple and very cost-effective way of connecting Gigabit Ethernet LANs over extended distances. To aid installation these media converters support an auto-sense MDI/MDIX port, allowing the media converter to connect directly with either a switch, PC adapter, or other Gigabit Ethernet device, using a standard cable. The AT-MC1004 Gigabit Ethernet media converters are powered by an external power supply for use in standalone applications. Where multiple media converters are used, up to 12 standalone devices can be inserted into the low-cost AT-MCR12 rackmount chassis, allowing all the converters to be powered by a single internal power supply. In critical applications, a second load sharing internal power supply can be installed into the rackmount chassis.