NIC
The network interface card (NIC), as its name suggests, is the expansion card you install in your computer to connect, or interface, your computer to the network. This device provides the physical, electrical, and electronic connections to the network media. A NIC is either an expansion card (the most popular implementation) or built in to the motherboard of the computer. In most cases, a NIC connects to the computer through expansion slots, which are special slots located on a computer’s motherboard that allow peripherals to be plugged direclty into it. In some notebook computers, NIC adapters can be connected to the printer port or through a PC card slot. NIC cards generally all have one or two light emitting diodes (LEDs) that help in diagnosing
problems with their functionality. If there are two separate LEDs, one of them may be the Link LED, which illuminates when proper connectivity to an active network is detected. This often means that the NIC is receiving a proper signal from the hub/MAU or switch, but it could indicate connectivity to and detection of a carrier on a coax segment or connectivity with a router or other end device using a crossover cable. The other most popular LED is the Activity LED. The Activity LED will tend to flicker, indicating the intermittent transmission or receipt of frames to or from the network.
Example:
NIC PCI
Note:
The first LED you should verify is the Link LED because if it’s not illuminated, there will be no chance for the Activity LED to illuminate.
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