Sat 24 October 2020

Ports: System Unit


A port is an interface or point of attachment. It is used to connect peripheral devices with computers such as printers, keyboards, or mouse. Ports have different types of connectors. A connector joins a cable to a device. One end of the cable is attached to the connector on the system unit and the other end is attached to the connector on the peripheral
device. Different genders of connectors are as follows:

Male Connectors: It has one or more exposed pins like the end of an electrical cord.
Female Connector: It has matching holes to accept the pins on a male connector like an electrical wall outlet.

Gender changer is a device that is used to join two connectors of same-gender i.e. two male connectors or two female connectors.

Serial Ports

A serial port is used to connect devices to the system unit A serial port transmits data one bit at a time It is usually used to connect devices that do not require fast data transmission like mouse and keyboard etc.

Parallel Ports

The parallel port is used to connect devices that transfer many bits at a time. Printers connect to computers using a parallel port.

Universal Serial Bus Port

Universal serial bus port (USB) can connect up to 127 different peripheral devices with a single connector type. Many computers have one or two USB ports. Multiple devices can be attached to a USB port through a daisy chain. It means that the first device is attached to the USB port of the computer, the second USB device connects to the first USB device, the third USB device connects to the second USB device, and so on.

An alternative to the daisy chain is the USB hub. USB hub plugs into the USB port on the system unit. It contains multiple USB ports used to connect many USB devices.

Special-Purpose Ports

1394 Port

This port is also called FireWire port. It can connect multiple types of devices that require faster data transmission speeds like digital video cameras, digital VCR, color printers,
scanners, etc. It can connect up to 63 devices together.


MIDI stands for musical instrument digital interface. MIDI port connects the system unit to a musical instrument like an electronic keyboard. A system unit with MIDI port can record sounds created by a synthesizer and then process these sounds. Synthesizer is a peripheral or chip mat that creates sound from digital instructions.



SCSI stands for a small computer system interface. It is a special high-speed parallel port to attach SCSI peripheral devices like disk drives and printers. It can connect up to 15 devices using a daisy chain.


IrDA Port

IrDA- stands for Infrared Data Association. It is also called fast Fast Infrared (FIR). A wireless device can transmit signals to a computer with an IrDA port. Different devices use IrDA port like keyboard, mouse, printers, digital cameras, etc. These devices use a high-speed IrDA port.


Bluetooth Port

Bluetooth port is an alternative to the IrDA port. It uses radio waves to transmit data between two devices. Bluetooth-enabled devices can communicate with one another without aligned with one another. The USB port or serial port can be converted into Bluetooth port b using Bluetooth wireless port adapter.