A repeater is a networking device that is used to extend the length of a LAN (Local Area Network) by amplifying or regenerating the signal. It receives a signal from a network device, such as a computer or a switch, and then retransmits the signal to other devices on the LAN. This effectively extends the physical distance over which the LAN can operate.
There are two main types of repeaters: analog and digital. Analog repeaters simply amplify the signal, while digital repeaters regenerate the signal.
Analog repeaters work by amplifying the electrical signal that is sent over the network cable. This allows the signal to travel a greater distance before it becomes too weak to be properly received by other devices. However, since they only amplify the signal, they do not remove any noise or interference that may be present on the signal, which can cause problems if the signal becomes too weak.
Digital repeaters, on the other hand, regenerate the signal by converting the analog signal into a digital one, and then retransmitting it. This process effectively removes any noise or interference that may be present on the signal, resulting in a stronger, cleaner signal that can travel a greater distance.
Repeaters are typically used in situations where the distance between devices on a LAN is too great to be covered by a single network cable. They are also useful in situations where there are a lot of obstacles, such as walls or other physical barriers, that can weaken or block the signal.
It's also worth noting that repeaters, as well as other networking devices, like hubs, bridges and switches, are replaced today by routers, which are capable of both connecting different networks and also extending the range of the LAN.
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