Function of a Computer Network HUB
Hub is a general term used to describe a central connection point for computers on the network. The basic functions performed by the hub is receiving signals from a computer and transmits to the other computer. Hub can be active or passive. A network hub is a fairly unsophisticated broadcast device. Hubs do not manage any of the traffic that comes through them, and any packet entering any port is broadcast out on all other ports. Since every packet is being sent out through all other ports, packet collisions result—which greatly impedes the smooth flow of traffic. A network hub or repeater hub is a device for connecting multiple twisted pair or fiber optic Ethernet devices together and thus making them act as a single network segment. Hubs work at the physical layer (layer 1) of the OSI model. The device is thus a form of multiport repeater. Repeater hubs also participate in collision detection, forwarding a jam signal to all ports if it detects a collision. Most hubs (intelligent hubs) detect typical problems, such as excessive collisions on individual ports, and partition the port, disconnecting it from the shared medium. Thus, hub-based Ethernet is generally more robust than coaxial cable-based Ethernet, where a misbehaving device can disable the entire collision domain. Even if not partitioned automatically, an intelligent hub makes troubleshooting easier because status lights can indicate the possible problem source or, as a last resort, devices can be disconnected from a hub one at a time much more easily than a coaxial cable. They also remove the need to troubleshoot faults on a huge cable with multiple taps.
Additional functions other than as a central connection point, hub provides the following capabilities:
Hub is a general term used to describe a central connection point for computers on the network. The basic functions performed by the hub is receiving signals from a computer and transmits to the other computer. Hub can be active or passive. A network hub is a fairly unsophisticated broadcast device. Hubs do not manage any of the traffic that comes through them, and any packet entering any port is broadcast out on all other ports. Since every packet is being sent out through all other ports, packet collisions result—which greatly impedes the smooth flow of traffic. A network hub or repeater hub is a device for connecting multiple twisted pair or fiber optic Ethernet devices together and thus making them act as a single network segment. Hubs work at the physical layer (layer 1) of the OSI model. The device is thus a form of multiport repeater. Repeater hubs also participate in collision detection, forwarding a jam signal to all ports if it detects a collision. Most hubs (intelligent hubs) detect typical problems, such as excessive collisions on individual ports, and partition the port, disconnecting it from the shared medium. Thus, hub-based Ethernet is generally more robust than coaxial cable-based Ethernet, where a misbehaving device can disable the entire collision domain. Even if not partitioned automatically, an intelligent hub makes troubleshooting easier because status lights can indicate the possible problem source or, as a last resort, devices can be disconnected from a hub one at a time much more easily than a coaxial cable. They also remove the need to troubleshoot faults on a huge cable with multiple taps.
Additional functions other than as a central connection point, hub provides the following capabilities:
- workstation. increasing distance network (as a repeater function).
- facilitate the addition, removal or transfer .
- tolerance (insulation damage) provides a centralized service management (collection of information, diagnostics).
- provides flexibility to support different interfaces.
- Passive hubs simply act as a connection box; he split / separate the incoming signal to the transmitted to the entire network .
Hub is a general term used to describe a central connection point for computers on the network. The basic functions performed by the hub is receiving signals from a computer and transmits to the other computer. A hub can be active or passive. Active hubs act as repeaters regenerate and he sends the amplified signal. Passive hubs simply act as he shares the connection box / separate incoming signals to be transmitted to the whole is central to network.Hub star topology and allows the computers to be added or removed on the network with relative ease.
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