Practical - 74 :- To identify and understand the functions of various ports, connectors, and control buttons located on the front and rear panels of a Desktop PC.

Objective

To identify and understand the functions of various ports, connectors, and control buttons located on the front and rear panels of a Desktop PC.

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I. Rear Panel Identification 

The rear panel is the primary interface for connecting power and external peripheral devices.

• SMPS (Switch Mode Power Supply): An electronic circuit that converts AC input voltage into regulated DC supply for internal components.

• SMPS Fan: Internal fan used to radiate heat from the SMPS to the outside.

• Power In Socket: Input for 220V AC main supply.

• PS-2 Ports: 6-pin round connectors for legacy input devices.

  • Purple: Keyboard

  • Green: Mouse

• USB Ports (Universal Serial Bus): Used for connecting modern peripherals (Printers, Webcams, etc.). USB 3.0 is preferred for high-speed data transfer.

• Video Interface Ports:

  • VGA Port (15-pin Female): Analog connection for Monitor/LCD.

  • DVI Port: High-speed serial link for digital displays.

  • HDMI Port: High-definition interface for both video and multi-channel sound.

• LAN Port: Network port used to connect the PC to a router or other computers.

• Audio Ports:

  • Green: Headphones or Speakers

  • Pink: Microphone (Mic)

  • Blue: Line-in

• Expansion Slots: Used to install add-on cards (Graphics, Sound, etc.) to enhance motherboard capabilities.

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II. Front Panel Identification

The front panel provides easy access for daily operations and frequently swapped devices.

• Power Switch: The main button used to switch ON the computer.

• Reset Switch: Used to reboot the system if the computer becomes unresponsive ("stuck-up").

• LED Indicators:

  • Power LED: Glows to indicate the system is receiving power.

  • HDD LED: Flashes or glows to indicate the Hard Disk Drive is actively reading or writing data.

• Optical Drive Slot (DVD-Writer): The top cabinet slot reserved for CD/DVD ROMs.

• Front USB & Audio: Conveniently located ports for USB drives, microphones, and headphones, avoiding the need to reach the back of the PC.

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III. Summary Table for Identification

Component	Location	Primary Function
HDMI/VGA	Rear	Connecting Display/Monitor
LAN Port	Rear	Internet/Network Connectivity
Power LED	Front	Indicates Power Status
PS-2 (Purple)	Rear	Keyboard Connection
Reset Switch	Front	System Reboot