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modems



router

The Internet is represented by a cloud since once Internet traffic hits the backbone, it can take numerous and various pathways to get from one device to another
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A hub is  a Collection of communications equipment designed to receive signals from (and usually transmit signals to) satellites. It is also called a downlink station
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A satellite is a specialized wireless receiver/transmitter — essentially a radio- frequency repeater  that is launched by a rocket and placed in orbit around the earth.
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Bandwidth refers to the  amount of digital information that is transferred from one point to another. 
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By ground station we are referring to the VSAT (Very Small Aperture Terminal) and its router which  receive from and transmit data to satellites. 
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Modem (Modulator/Demodulator) is a device that enables data to be transmitted between computers, generally over telephone lines...more....

A Router is a  device that forwards data packets from one local area network (LAN) or wide area network (WAN) to another or from a network to another connection Like in our diagram: a ground station.
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  Customers refers to users who browse the Internet.  They could be random individuals, as depicted in the diagram above.  These individuals could have access to the Internet in their homes or offices or could also be part of a network.

A basic scenario of internet access for a Local Area Network in Nigeria via  satellite

So How  does Satellite Communication via Satellites work?