A hub
is a device used to connect all computers in a star or ring network. Hubs
are available four five port devices designed for home networks and small
businesses to large rack mount units with up to 24 ports or more. Installing
a single hub is simply a matter of connecting to a power source and connect the
cables connected to the network interface cards on their computers.
Hubs
are associated with specific protocols of the data link layer. Ethernet
hubs are common, because Ethernet is a popular protocol data link layer. An
Ethernet hub is called a multiport repeater. If
you have a thin Ethernet cable with a longer segment than the maximum allowed,
you can install a repeater at some point in the segment to strengthen the
signals and increase the maximum segment length. This repeater only has
two BNC connectors. When
data between the hub, the hub amplifies the signal and sends it through all
other ports. The hub
relays every packet transmitted by a computer on the network to any other computers,
and also amplifies the signals. The
maximum segment length for UTP cable in an Ethernet network is 100 meters. Hubs
operate as a repeater, each of the connecting cables of a computer to a hub
port can be up to 100 meters in length, allowing a segment of length up to 200
meters when a hub is inserted into the network.
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