The CXU500 is a CAT5E UTP cable (CAT50) terminated with gold plated male RJ45 connectors at both ends. The CAT50 cable contains four pairs of copper wire. CAT50 supports Fast Ethernet (100 Mbps) and supports frequencies of 100 MHz. Although the CAT50B cable has four pairs of copper wire, Fast Ethernet communications only utilize two pairs. This cable also supports frequencies of 100 MHz and it is backward compatible with CAT5.