DESCRIBE THE PRINCIPLE OF SIGNAL THEORY (P5).
Digital signals are signal that are transferred by a computer. These digital signal
use binary codes of zero’s and one’s. Example of binary number is 00011001. BIT
is the smallest element of data, when they are combined, they form larger units
called Byte. Data transmitted in wave forms have two main characteristics, these
are amplitude and frequency. Amplitude can be described as the height of the
wave, the high amplitude of the signal the stronger the wave means the signal will
travel for a long distance. Frequency is the amount of waves in wave length.
Digital signaling methods consist number of techniques which improves data
exchange between computers and devices. The following are the digital signaling
methods:
Representing data electronically.
Data can be presented electronically through bits, bytes and data structures.
Data/packet structure is the one of representing data electronically, a packet is
the unit of data transferred over network. In order data to be transmitted over
network, it must be in the form of packet structure. Packet structure consist of
different layers. The first layer is the header which have information to ensure
data is transferred to the correct destination. The second layer is the payload
which deals with mapping, addressing and sending the information. Data packets
contains different element such as destination, error control and actual data that
is sent across network.
Another way in which data is represented electronically across the network is Bits
which is the lowest unit of data. Each bit represented as 0 and 1 state. Binary
helps to organize in chains of bits called bytes. Sending of data from computer to
another is called encoding. Bytes can be described a s group of 8 bits which allow
network to transmit and to store data.
Synchronous transmission.
This is the method of transferring data which uses sequence of data signal and
timing signals to ensure that sender and receiver and in sync with each other.
,When two devices communicate with each other, there must be clocking signal
which synchronizes the transmission on the receipt of data. Synchronous
transmission is used by network protocols like Ethernet and token.
Asynchronous transmission.
This is another method of transferring data as the data are transmitted in spurts.
Using asynchronous transmission, the transmitted data must have the start bit
before each character and stop bit to notify the receiver that the transmission has
finished. This type of data transmission is mostly used in communication over
telephone lines.
Error detection and error correction.
This is the technique used to detect different impairment in order to ensure
reliability of data. In communication, error can occur when a message is
transmitted due to irregularities in signals. Due to this error, this can cause the
data to be corrupted. To avoid this, error detecting code are used in transmitted
data to detect errors that may occur during transmission. Also on other hand
error correction, This is the process that occurs after error detection which fixes
any corrupted data and ensure the data is error less when it reaches the
destination.
Bandwidth limitation and noise.
Bandwidth and noise have impact on data that is being transmitted. Bandwidth
describe amounts of data that can be transmitted through single communication
channel. Most modern networks allow transfer millions to billions of data per
second. Internet service providers use bandwidth limitation to limit the speed of
data transfer on broadband internet connection. The more customer pays on
internet connection, for example some customers pay for fiber optic because the
higher the limit of data transfer provide faster internet speed.
Bandwidth noise is irregularities in signals during transmission which lead to data
corruption. Bandwidth noise cause errors in data which is transmitted such as for
, example reduces the quality of data is sent such as sound and images. The effect
of bandwidth noise can be avoided by error detection and correction.
Channel types.
Transmission of any data relies on channel type that is used to transmit data
across by considering distance limitations. The following are the communication
channels which are in frequent use:
Telephones. This is one of the channel types which allow users to
communicate with each other over a distance. This channel type uses radio
signals which exchanges information between sender and receiver over
radio channels.
Satellite. This is the device that placed on orbit which allow connection and
communications. The benefits of using satellites as channel type is that it
allows high bandwidth for low price.
Microwave. This channel type which uses electromagnetic radiations that
allow transmission of data with no requiring cables.
Other issues.
Bandwidth. Bandwidth and noise have impact on data that is being transmitted.
Bandwidth describe amounts of data that can be transmitted through single
communication channel.
Compression. Compression of data is required on low bandwidth services in order
to improve the rate of data transmission. There are many compression formats
which is used, for example JPEG used for compression of applications. Also, for
example, the common format which is used for data transmission and
compression is Huffman codding which allow data compression in the
transmission from one device to another.
Generally, there are various methods of digital signals which are used to improve
data exchanges between computers and devices.
Digital signals are signal that are transferred by a computer. These digital signal
use binary codes of zero’s and one’s. Example of binary number is 00011001. BIT
is the smallest element of data, when they are combined, they form larger units
called Byte. Data transmitted in wave forms have two main characteristics, these
are amplitude and frequency. Amplitude can be described as the height of the
wave, the high amplitude of the signal the stronger the wave means the signal will
travel for a long distance. Frequency is the amount of waves in wave length.
Digital signaling methods consist number of techniques which improves data
exchange between computers and devices. The following are the digital signaling
methods:
Representing data electronically.
Data can be presented electronically through bits, bytes and data structures.
Data/packet structure is the one of representing data electronically, a packet is
the unit of data transferred over network. In order data to be transmitted over
network, it must be in the form of packet structure. Packet structure consist of
different layers. The first layer is the header which have information to ensure
data is transferred to the correct destination. The second layer is the payload
which deals with mapping, addressing and sending the information. Data packets
contains different element such as destination, error control and actual data that
is sent across network.
Another way in which data is represented electronically across the network is Bits
which is the lowest unit of data. Each bit represented as 0 and 1 state. Binary
helps to organize in chains of bits called bytes. Sending of data from computer to
another is called encoding. Bytes can be described a s group of 8 bits which allow
network to transmit and to store data.
Synchronous transmission.
This is the method of transferring data which uses sequence of data signal and
timing signals to ensure that sender and receiver and in sync with each other.
,When two devices communicate with each other, there must be clocking signal
which synchronizes the transmission on the receipt of data. Synchronous
transmission is used by network protocols like Ethernet and token.
Asynchronous transmission.
This is another method of transferring data as the data are transmitted in spurts.
Using asynchronous transmission, the transmitted data must have the start bit
before each character and stop bit to notify the receiver that the transmission has
finished. This type of data transmission is mostly used in communication over
telephone lines.
Error detection and error correction.
This is the technique used to detect different impairment in order to ensure
reliability of data. In communication, error can occur when a message is
transmitted due to irregularities in signals. Due to this error, this can cause the
data to be corrupted. To avoid this, error detecting code are used in transmitted
data to detect errors that may occur during transmission. Also on other hand
error correction, This is the process that occurs after error detection which fixes
any corrupted data and ensure the data is error less when it reaches the
destination.
Bandwidth limitation and noise.
Bandwidth and noise have impact on data that is being transmitted. Bandwidth
describe amounts of data that can be transmitted through single communication
channel. Most modern networks allow transfer millions to billions of data per
second. Internet service providers use bandwidth limitation to limit the speed of
data transfer on broadband internet connection. The more customer pays on
internet connection, for example some customers pay for fiber optic because the
higher the limit of data transfer provide faster internet speed.
Bandwidth noise is irregularities in signals during transmission which lead to data
corruption. Bandwidth noise cause errors in data which is transmitted such as for
, example reduces the quality of data is sent such as sound and images. The effect
of bandwidth noise can be avoided by error detection and correction.
Channel types.
Transmission of any data relies on channel type that is used to transmit data
across by considering distance limitations. The following are the communication
channels which are in frequent use:
Telephones. This is one of the channel types which allow users to
communicate with each other over a distance. This channel type uses radio
signals which exchanges information between sender and receiver over
radio channels.
Satellite. This is the device that placed on orbit which allow connection and
communications. The benefits of using satellites as channel type is that it
allows high bandwidth for low price.
Microwave. This channel type which uses electromagnetic radiations that
allow transmission of data with no requiring cables.
Other issues.
Bandwidth. Bandwidth and noise have impact on data that is being transmitted.
Bandwidth describe amounts of data that can be transmitted through single
communication channel.
Compression. Compression of data is required on low bandwidth services in order
to improve the rate of data transmission. There are many compression formats
which is used, for example JPEG used for compression of applications. Also, for
example, the common format which is used for data transmission and
compression is Huffman codding which allow data compression in the
transmission from one device to another.
Generally, there are various methods of digital signals which are used to improve
data exchanges between computers and devices.
