Patton
CopperLink CL2300
Patton’s CopperLink CL2300 allows you to secure, and manage Ethernet over copper wiring by bonding up to four twisted pairs into a single long-range Ethernet connection. The CL2300’s 4-port managed Ethernet extenders deliver 60 Mbps Ethernet Extension over existing copper cabling. It also features remote management and security features such as SSH and Stateful Firewall. The CL2300 can extend Ethernet connections up to 24,000 feet.
http://www.patton.com/ethernet-extender/cl2300/