Topic 1: Hardware -Data transmission
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| Circuit switching | Path is set up between sender and receiver and is released after transmission is complete. It cannot be used by any other traffic during that time.Data is sent in order
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| Packet switching | Data (content) split into packets, which can take a different route through network and may arrive out of order - then re-assembled. Each packet carries the source and destination addresses.
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| Packet information | the actual data; order number of packet; source and destination addresses; control signals; error control bits.
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| Why is Packet switching preferred? | Better security. More efficient use of data lines - no waiting during gaps. Less likely to be affected by network failure.
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| Half-duplex transmission | is when data can be sent in only one direction at a time.
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| Full duplex | Data can be sent in both directions at once / simultaneously / at same time.
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| Simplex | Data transmission is possible in one direction only.
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| Serial transmission | occurs when binary digits (bits) are sent one by one along the data channel.
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| Parallel transmission | occurs when a number of bits are sent simultaneously.
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| Why are Network protocols necessary? | To specify data formats; to enable devices to communicate with each other.
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| Data collision | occurs when two sets of data are detected on the network simultaneously. Once detected, a computer waits for a short random time then sends again.
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| Multiplexing | is where several independent data sources are combined to be sent along a single route to a single destination.
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| Router | is a device in a network which holds information about the addresses of computers in the network or other networks and can send data to the correct computer / network / device.
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| Switching | prevents all data being sent to all parts of a network / makes efficient use of the data lines.
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| Digital transmission preference | is preferred as it is less likely to suffer corruption/degradation/interference
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| Protocols | are necessary to specify data formats, etc, to enable devices to communicate with each other.
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| Parallel transmission | occurs when a number of bits are sent simultaneously/ sent over multiple paths / lines.
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| Parallel processing | the simultaneous use of several processors/cores to perform a single task. It could be useful where an extremely large/complicated calculation is being carried out (e.g. weather forecasting
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| Benefits of digital transmission | is preferred as it is less likely to suffer corruption/degradation. Can error check data. Can compress data and therefore transfer time is quicker.
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Created by:
mcounsell
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