Dor Info and specifications go to : http://www.blackbox.com/Store/Detail.aspx/4-Port-BNC-Repeater/LE8003A-R2

Further Details ?Four ThinNet connectors plus an AUI connector for backbone connections. ?Compliant with Ethernet/IEEE 802.3, 10BASE2, and 10BASE5 standards. ?Has both auto- and manual partition, so users can take a segment offline. The 4-Port BNC Repeater has everything you?re looking for: full IEEE 802.3 compliance, a small footprint, an AUI port for backbone connections, LEDs at every port?and a very reasonable price. It?s ideal for workgroups. All ports are functionally equivalent, and you can connect Ethernet devices directly to the repeater. The repeater installs easily without tools and once installed, configures itself. Internal network management constantly monitors each port for signal quality, ensuring packet integrity across the network.