Signal Theory
Signal Theory
Introduction-
In this report I will be writing about Signal Theory and all of its aspects, this involves talking about how data is transferred over a network, what a packet is and what information it contains, asynchronous and synchronous transmission, errors that data may encounter and what protocols are in place to avoid this from happening.
Digital Signalling Methods-
When data is sent over a network, it can either be through a wired or a wireless technology. The data is sent over a network using electric pulses.
[pic]
Amplitude-
Amplitude is the strength or loudness of the signal whilst transferring data over a network, the higher the amplitude is the stronger the network signal will be. Therefore, the lower the amplitude is the weaker the signal would be concluding that a stronger amplitude would travel a greater distance and transfer data at a quicker rate.
In other technologies amplitude has different meanings, radio and microwaves use the same transmission method, radio waves signalling distance would be measured by metres or millimetres. Microwaves would wirelessly transfer over kilometres with power readings differing between MHz and GHz.
Telephone cables and data cables both rely on electrical currents, telephone cables can handle up to +/- 50 volts switching between a positive and negative current, this is called an alternative current. Standard data cables can only handle +/- 5 volts, if the is exceeded then it could damage components inside your computer.
When dealing with light technologies like fibre optic, the strength of the signal all depends on the brightness of the light or laser source. Light can travel much faster than any other source and can cover greater distances, but at the same time is much more expensive.
Frequency-
Frequency is the rise and fall of the signal, it moves from zero upwards then cycles back round, a low frequency would only transmit a small amount of cycles per
Introduction-
In this report I will be writing about Signal Theory and all of its aspects, this involves talking about how data is transferred over a network, what a packet is and what information it contains, asynchronous and synchronous transmission, errors that data may encounter and what protocols are in place to avoid this from happening.
Digital Signalling Methods-
When data is sent over a network, it can either be through a wired or a wireless technology. The data is sent over a network using electric pulses.
[pic]
Amplitude-
Amplitude is the strength or loudness of the signal whilst transferring data over a network, the higher the amplitude is the stronger the network signal will be. Therefore, the lower the amplitude is the weaker the signal would be concluding that a stronger amplitude would travel a greater distance and transfer data at a quicker rate.
In other technologies amplitude has different meanings, radio and microwaves use the same transmission method, radio waves signalling distance would be measured by metres or millimetres. Microwaves would wirelessly transfer over kilometres with power readings differing between MHz and GHz.
Telephone cables and data cables both rely on electrical currents, telephone cables can handle up to +/- 50 volts switching between a positive and negative current, this is called an alternative current. Standard data cables can only handle +/- 5 volts, if the is exceeded then it could damage components inside your computer.
When dealing with light technologies like fibre optic, the strength of the signal all depends on the brightness of the light or laser source. Light can travel much faster than any other source and can cover greater distances, but at the same time is much more expensive.
Frequency-
Frequency is the rise and fall of the signal, it moves from zero upwards then cycles back round, a low frequency would only transmit a small amount of cycles per