The C5CU1000CMR from Security Dynamics is a Cat5e 24AWG UTP cable, CMR riser, 1000 feet. Category 5 cable (cat 5) is a twisted pair cable for carrying signals. This type of cable is used in structured cabling for computer networks such as Ethernet. The cable standard provides performance of up to 350 MHz and is suitable for 10BASE-T, 100BASE-TX (Fast Ethernet), and 1000BASE-T (Gigabit Ethernet).