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What are Ports?
A port is a socket that allows electrical signals (analog and digital) to be inputted onto or outputted from the system bus.
There can be two types of ports:
Wired Ports: These receive/transmit data from a peripheral, connected by a wire, through a direct current DC format
Wireless Ports: These have antennas to send/receive their data through other waves of the electromagnetic spectrum. When these ways are received form a wireless peripheral, they have to be converted to DC format before being accepted by the system bus. Similarly, on transmission to a wireless peripheral, the data in DC format has to be converted to its respective electromagnetic wave, to be sent from the PC to the external device.
It is important to note that all types of ports end up being wired to the system bus.
There are many different types of wired ports, each with its own specific task to cater for certain external devices. We will take a look at the most important, which are Serial and Parallel Ports.
Serial Ports (also called RS-232 and COM)
These can come in two formats: 9-pin or 25-pin setup.
They allow external devices to be connected to the computer system through a serial data transfer (one bit being sent at a time).
This port can only cater for slow traffic devices, such as mice and modems.
A serial port is a full duplex carrier. This means that data can be sent simultaneously from a source to the destination on a pair of wires and from the destination to the source on a different pair of wires.
Parallel Ports (also called LPT)
These were introduced after the serial ports by IBM
8 bits can be passed simultaneously from the source to the destination allowing a transfer of 100KBps over a maximum distance of 5 meters.
There are other types of Wired ports, which include:
Keyboard Port, Universal serial Bus Port, IDE/ATA Port, SCSI Port, Network Port, Video Adapter Port, Audio Port, MIDI Port and Games Port.
What Are Ports? Extended Notes – Ms Natasha