For a printer to connect directly into a computer network, it must have the proper type of port for network connection. A printer Network Interface Card (NIC) is an adaptor that the printer uses to access the network media. This NIC may be built into the printer or come in the form of an expansion card. Currently, the most popular printer NICs have RJ-45 ports to connect into copper-based Ethernet networks. Usually, connecting the printer NIC to a network hub or switch with a Cat 5 cable does this. Other printer NIC types include Bayonet Nut Connector (BNC), RJ-11 (4-wire telephone cabling), and wireless (infrared or Radio Frequency).