It is universally acknowledged that optical transceiver is widely used in the data center. That is because optical transceiver is playing a major role on data transmission. Therefore this article is written for make a brief introduction about data transmission.
![Data Transmission | Description-Types-Differences]( "Data Transmission | Description-Types-Differences")
Description
the Data transmission, also referred to as digital transmission or digital communications, is the movement of data over a communication medium from one device to another. In the form of a digital bitstream or a digitized analog signal, the process of data transmission is applied in different channels: point to point, point-to-multipoint, or multipoint-to-multipoint. Examples of such channels are copper wires, optical fibers, wireless communication using radio spectrum, storage media and computer buses. The data is represented as an electromagnetic signal, such as an electrical voltage, radiowave ,microwave , or infrared signal.
Analog transmission is a method of conveying voice, data, image, signal or video information using a continuous signal which varies in amplitude, phase, or some other property in proportion to that of a variable. According to the most common definition of digital signal, both baseband and passband signals representing bit-streams are considered as digital transmission, while an alternative definition only considers the baseband signal as digital, and passband transmission of digital data as a form of digital-to-analog conversion.
Types
The figure below illustrates the types of data transmission.
![Data Transmission | Description-Types-Differences]( "Data Transmission | Description-Types-Differences")
Differences
The tables below illustrates the differences of data transmission.
Table 1
Comparison between Parallel Transmission and Serial Transmission
Basis for Comparison | Parallel Transmission | Serial Transmission |
Definition | Data flows in multiple directions, 8 bits(or 1 byte) a time | Data flows in 2 directions, bit by bit |
Cost | expensive | economical |
Number of bits transferred per clock pulse | 8 bits or 1 byte | 1 bit |
Speed | fast | slow |
Applications | short-distance communication | long-distance communication |
Example | computer to printer | computer to computer |
Table 2
Comparison between Asynchronous Transmission and Synchronous Transmission
Basis of Comparison | Asynchronous Transmission | Synchronous Transmission |
Definition | transmits 1 byte or character at a time | transmits data in the form of chunks or frames |
Speed | slow | fast |
Cost | cost-effective | expensive |
Time interval | random | constant |
Are there gaps between the data? | No | Yes |
Examples | email, forums, letters | chat rooms, telephonic conversations, video conferencing |
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References:
①https://teachcomputerscience.com/data-transmission/
②https://en.wikipedia.org/wiki/Data_communication