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What is Serial Transmission?
Serial transmission is a method of data communication where bits are sent one at a time over a single communication channel, as opposed to parallel transmission which sends multiple bits simultaneously over multiple channels.
With the importance of speed in data communications, it may seem logical to choose parallel transmission. However, most communication systems use serial mode due to practical advantages.
Advantages of Serial Transmission
There are two main reasons why serial transmission is preferred over parallel transmission:
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Cost-effectiveness over long distances − Serial networks require fewer physical wires, making them much less expensive to implement over long distances. Intermediate electronic components are also less costly.
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No timing synchronization issues − Using only one physical wire eliminates timing problems caused by slight differences in wire lengths. Even millimeter differences can be critical in high-speed communication systems.
Hardware Conversion
For serial transmission to work, both sender and receiver must include hardware that converts data between the parallel form used internally by machines and the serial format used on the communication wire.
The complexity of this conversion hardware depends on the type of serial communication mechanism:
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UART (Universal Asynchronous Receiver and Transmitter) − A single chip that handles conversion for asynchronous serial communication.
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USART (Universal Synchronous-Asynchronous Receiver and Transmitter) − A related chip that handles conversion for both synchronous and asynchronous networks.
Types of Serial Transmission
There are three main types of serial transmission based on timing characteristics:
| Type | Timing Characteristics | Use Case |
|---|---|---|
| Asynchronous | Irregular timing with arbitrary delays between transmissions | Keyboard input, mouse communication |
| Synchronous | Continuous transmission with no gaps between data items | High-speed network communication |
| Isochronous | Regular intervals with fixed gaps between transmissions | Real-time audio/video streaming |
Conclusion
Serial transmission sends data one bit at a time over a single wire, offering cost advantages and eliminating timing issues compared to parallel transmission. Different types of serial transmission (asynchronous, synchronous, and isochronous) serve various communication needs in modern networks.
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