Karteikarten
Network, Hardware & Physical Media
Karten in diesem Stapel (5)
- 1Network Hardware & Physical MediaRouter
A router will accept incoming data packets arriving from a connected Local Area Network, it will then read the destination address embedded in each data packet and work out which of the other LANs it is connected to is the best one to use for that particular data packet. - 2SWitchA switch is a component which is used within a computer network.
A switch has a number of ports and it stores the addresses of all network devices that are directly or indirectly connected to it on each port.
As a data packet comes into the switch, its destination address is examined and a direct connection is made between the sending and receiving machines. - 3CoaxialThis is a type of signal transmission cable.
It has a thin copper core/wire about a millimeter thick. The core is separated from the outer sheath by some plastic spacers to keep the core in the centre of the cable at all times. This is why you can't bend the coaxial too much without kinking and damaging it.
Co-axial cable is excellent for carrying radio signals. The lead going from the television aerial to your television is a co-axial cable. The lead from the satellite dish to the receiver is a co-axial cable. - 4Twisted Coaxial
- 5Fibre opticFibre-optic cable allows data to be transimitted by making use of light.
The cable has an extremely transparent central glass core, which is surrounded by cladding. When light enters the central core, it cannot get out until it reaches the other end because the cladding reflects the light - so effectively fibre-optic cable is a guided-light pipe.
A fibre-optic system works as follows
The data is mixed (modulation) with the carrier light beam
The beam is injected into the fibre-optic cable
At the other end of the cable, a photo-detector senses the light and converts it into a normal electrical signal
The signal is passed into an electronic demodulator to extract the original data
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- Karteikarten am Network, Hardware & Physical Media, erstellt von Shaaumiga Sivasathiy am 14/09/2015.
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- Shaaumiga Sivasathiy
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