Active and Passive Hub + Difference

Difference between Active(Central) and passive (secondary) hub.

Hub:
Hub is a network device which is used to connect multiple devices together to form a network. Hub can be either Active or Passive.

Difference:
The Hub which has a Repeater in it is known as an Active Hub whereas the Hub which is without Repeater is called as Passive Hub.

• Passive hub only copy signals but active hub cannot.
• Active hub Need Electricity but passive hub not.
• Active hub more smarter then passive hub.
• Passive hub is just a connector which connects wire coming from other devices.
• Active hub is multipoint repeater.
• Active hub can process information while passive hub cannot do this.

Example:
In the following diagram which is a simple representation of a Tree Topology, the central hub with which other three hubs are connected is acting as an Active Hub whereas other three hubs are passive hubs. Note: the other three hubs can also be Active Hubs if these contain Repeater.



Repeater:
Furthermore, Repeater is a device that regenerates the received bit pattern before transmitting to next device.

More About Active and Passive Hub.

Active Hub

Active hubs are called smarter then passive hubs. Another term which you also known about is  "concentrators," you can call them active hubs that strengthen a signal and make it concentrated as passes the hub e.g enters and exit. They can process information coming from other sources but they need electricity too.

Passive Hub

Physical networks build by these hubs called node to node contact between physical networks. Assume an example of  a punch-down block that is made of simple plastic, un-powered box used to plug network cables into. These are called repeater who can give support to connect multi devices but cannot use electricity for this purpose.

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