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2.2 Data Transmission (Transmission methods (Full-Duplex - Data can be…
2.2 Data Transmission
Transmission methods
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Half-Duplex - Data can be sent both ways, but only one at a time
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Parallel - Sends data 8 bits at a time. Faster, but is more prove to interferance
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Topology
Ring network - Similar to the Bus Network, only data travels in a single direction, round a closed loop. Not very reliable as a single fault means entire system doesn't work (Same as bus). Slightly faster though
Mesh network - Each device is directly connected together. Ideal for small networks (i.e no more than 4 devices) as there would be lots of cables and be rather expensive.
Bus network - Data is transmitted along the single cable, checking the IP of every device as it passes them until it reaches its designated target. Slow but cheap and easy to add a new device into.
Star network - Each device is connected to the central hub/switch, which directs data to the correct machine. Much faster communication, but harder to wire.
Definitions
CSMA/CD (Carrier Sense Multiple Access with Collision Detection) - Firstly, a device will check if another device is already transmitting before doing so. If not, it will start to send data. If a collision is detected, the transmission is stopped, and will retry after a randomly generated amount of time.
Routing - A process which determines a set of routes for packets to be sent across the network. These routes get stored in a routing table, constructed in the memory of the networking components being used.
Multiplexing - Where data from different sources, but going to the same destination, are combined so that they can all travel down the same route.
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Switching
Packet Switching - Data is broken down into packets, which each follow their own route through the network. At the end, they are re-assembled and any missing packets are re-sent
Circuit switching - Route through a network is established before data is transmitted. The data will always follow that route, until communication is terminated.