Network interface card is ultimately to be connected with the network, so it must have an interface that allow network cable to use it to connect with other computer network equipment, Different network interfaces are applicable to different network types. Currently, common interfaces are Ethernet RJ-45 connector, BNC connector of thin coaxial cable, coarse coaxial AUI interface, FDDI connector and ATM connector etc. And in order to apply to a wider range of applications, some network interface cards providing two or more types of interfaces, such as the card will also provide RJ-45, BNC interface or AUI interface. So for letting you have a fully understanding of these different connectors, we’ll introduce them to you in detail one by one.

RJ-45 connector

This is the most common kind of network interface card with RJ-45 connector, but also the most widely used. This is mainly due to the popularity of twisted-pair Ethernet applications, because the network interface card with RJ-45 connector is used in twisted pair transmission media for Ethernet, its interface is similar to the common telephone interface RJ-11, but RJ-45 is 8-core, and telephone line interface is 4-core, usually use only 2 cores (the ISDN telephone line connects to 4 cores). And comes with 2 status indicators, the color of these two lights can be initial to determine the working status of the network interface card.

BNC connector

The network interface card with BNC connector used in thin coaxial cable for the transmission media for Ethernet or token network. Currently, the network interface card with BNC connector is not very popular, the main reason is that the network uses thin coaxial cable as a transmission medium is uncommon.