The Superior Essex Category 3 Station Wires CMR/CMX Outdoor cable is specifically designed for outdoor, indoor, or a combination of both applications. CMX Outdoor cables extend the run between the Network Interface Unit and the point of entry into the interior of a residence or a premise. Their twisted pair construction is small and lightweight. These Category 3 (CAT 3) cables have been tested and listed as UL 444 Outdoor compliant, requiring the cable to resist 300 hours of UV and heat. In addition, the CMR listing allows the cable to be used in riser spaces per UL 1666, eliminating the need to transition to fire resistant cables. UV-locking compounds also aid in protecting the cable from light. Two levels of Outdoor Protection are Available; CMR/CMX Outdoor and Extreme CMR/CMX Outdoor which meets the -40°C anvil test.