What are the differences between repeaters and hubs?
A hub is a physical layer in the OSI model that connects multiple Ethernet or optical cables to the same physical medium. It can also be used as a repeater for multiple ports. The hub collects the signal sent from the node, shapes and amplifies the signal, and forwards the amplified signal to all other ports.
Characteristics of repeaters.
The repeater, also called retransmitter, is a network interconnection device on the physical layer. When the signal leaves the transmitting station, the signal is transmitted along the medium. The longer the cable is, the worse the signal is. The role of the repeater is to amplify and shape the original signal to generate a new signal. The repeater is one of the interconnection devices currently using * * *. It only reproduces and amplifies the data information transmitted on the cable and transmits it to other network segments. For protocols above the link layer, there is no difference between multiple cables interconnected by the repeater and one cable, but the repeater itself will cause time delay.
Characteristics of concentrator.
The concentrator is similar to the repeater in characteristics. It is called a multiport repeater, and its purpose is to regenerate and reset network signals. The concentrator is a universal connection point between network devices. It is used to connect LAN segments. Each concentrator contains many ports. When each packet reaches a certain port, it will be copied to all other ports, so that LAN segments can see all packets. However, the concentrator itself does not recognize any information mode among signals, data and addresses.
The connection between repeater and concentrator.
It can be seen from the fact that concentrators are called multiport repeaters that the number of concentrator ports is usually between four and twenty. Some special concentrators may have more ports, while the number of repeater ports is usually only two. The number of ports is different, so that the concentrator can connect more devices, while the repeater can connect fewer. They all have a common role, that is, to amplify the weakened signal and send it again.