A LAN interface is an interface used to connect devices within a local area network (LAN) that follows specific network protocols and standards to ensure that data is transmitted and received across the network. A LAN is a computer network with a small coverage area, usually used in homes, offices, schools, etc. The main function of a LAN interface is to transfer data from one device to another, or from a device to the network.
There are various types of LAN interfaces, mainly divided into wired and wireless. Wired interfaces include Ethernet interfaces (e.g. RJ-45 interface), coaxial cable interfaces (e.g. BNC interface) and fiber optic interfaces (e.g. SC interface). Wireless interfaces include Wi-Fi interfaces (e.g. 802.11a/b/g/n/ac/ax) and Bluetooth interfaces (e.g. Bluetooth 4.0/5.0).
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Wired Interfaces
(1) Ethernet interface (RJ-45 connector)
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The Ethernet interface is the most common type of LAN interface, and it uses an RJ-45 connector for connection. Ethernet is a LAN technology based on the CSMA/CD (Carrier Sense Multi-Channel Access/Conflict Detection) protocol, which allows multiple devices to share the same network resources. Ethernet interfaces are available in different data transfer rates such as 10Mbps, 100Mbps, 1Gbps and 10Gbps.
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(2) Coaxial Cable Interface (BNC Interface)
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The coaxial cable interface is an earlier type of LAN interface that uses a BNC connector for connection. Coaxial cable is a type of cable that consists of an inner conductor, an insulation layer, an outer conductor, and a sheath, which provides a high level of interference immunity. The data transfer rate of coaxial cable interface is usually 10Mbps.
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(3) Fiber optic interface (SC interface)
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Fiber optic interface is a high-speed LAN interface type that uses fiber optic connectors (e.g., SC, LC, ST, etc.) for connection. Optical fiber is a fiber made of glass or plastic, which has extremely high immunity to interference and transmission rates. Fiber optic interfaces can reach data transfer rates of 1Gbps, 10Gbps or even higher.
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