different types of data transmission

Data transmission is the conveyance of any kind of information from one space to another. Historically this could be done by courier, a chain of bonfires or semaphores, and later by Morse code over copper wires.
In recent computer terms, it means sending a stream of bits or bytes from one location to another using any number of technologies, such as copper wire, optical fiber, laser, radio, or infra-red light. Practical examples include moving data from one data storage device to another such as accessing a website, which involves data transfer from web servers to a user’s browser.
A related concept to data transmission is the data transmission protocol used to make the data transfer legible. Current protocols favor packet based communication.
Data transmission is the process of sending data over a communications network.
It is the conveying of data from one functional unit to one or more additional functional units through the transmission of signals by wire, radio, light beam, or any other electromagnetic means. (Voice or video transmissions are not considered data transmission for the purposes of state policy.)
There are two types of data transmission
1) Serial transmission bits are sent over a single wire individually. Whilst only one bit is sent at a time, high transfer rates are possible. This can be used over longer distances as a check digit or Parity bit can be sent along it easily.
2) Parallel transmission Multiple wires are used which can transmit multiple bits simultaneously, which allows for higher data transfer rates than can achieved than with Serial transmission.
This method is used internally within the computer, for example the internal buses, and sometimes externally for such things as printers, The major issue with this is “skewing” because the wires in parallel data transmission have slightly different properties (not intentionally) so some bits may arrive before others, which means that the original “meaning” of the message is lost and thus leads to corruption, a parity bit can help to reduce this. How ever parallel data transmission is therefore unsuitable for long distances (as already mentioned) because skewing is far more likely.
Data transmission is the act of sending data from one place to another. Data is transmitted both inside and outside your computer. There are two fundamental methods of data transmission.
* Serial – Data is sent on a single line and one bit is sent at at a time. This is similar to a line which one item must come one after another.
* Parallel – Data is sent on more than one line at a time. This may be any number of bits at a time, but is usually one word at a time (two bytes) or possibly three bytes at a time