Chapter 1 ITCNA

Installing Motherboards and Connectors

Objectives

This chapter covers the following objectives:

  • Explain cable types and connectors

  • Install and configure motherboards

  • Explain legacy cable types

Cable Types and Connectors

Personal Computers

  • The components of a personal computer (PC) are divided into two categories:
      - User-handled components: These include peripheral devices.
      - Sensitivity/Danger components: These could be damaged or pose a risk if exposed.

  • Peripheral Devices: These are responsible for three main functions:
      - Input: Keyboard, mouse, microphone, camera
      - Output: Monitor, speakers
      - External Storage

  • System Case/Chassis: Housed internal components including
      - Motherboard
      - Central Processing Unit (CPU)
      - System Memory Modules
      - Adapter Cards
      - Fixed Disks
      - Power Supply Unit (PSU)

  • Most cases utilize a tower form factor promoting vertical orientation suitable for desk or floor placement.

Opening a Desktop Computer Case

  • To conduct PC maintenance, understanding case access is crucial:
      - A typical tower case features a removable side cover, slid away from its housing.
      - Secured by screws or retaining clips with potential anti-tamper mechanisms.
      - Always refer to the system documentation for best practices.

  • Front Panel: Provides access to removable media drives, power switches, and drive operation LEDs.
      - Often requires the side panel to be removed first to unfasten it.

  • Rear Panel: Access for PSU sockets and integral fan exhaust, which must remain unobstructed for effective cooling. Slots facilitate connection for peripheral devices and adapter cards. Uncovered slots risk disrupting airflow, leading to overheating and increased dust infiltration.

Peripheral Devices

  • Input/Output (I/O) Ports: Connect peripheral devices through cables.
      - Specific ports exist for particular devices like graphics ports for monitors.
      - External ports located in the rear or front are either on the motherboard or expansion cards.

Interfaces, Ports, and Connectors

  • Hardware Port: External connection point for particular types of bus interfaces (data transfer methods between devices).

  • Bus: Transfers data to/from devices. Each bus interface type may employ various connector form factors.
      - Most modern connectors use edge contacts ensuring correct orientation through asymmetric keying or reversible designs.

Binary Data Storage and Transfer Units

  • Computers process binary data comprising bits that represent values of 1 or 0.
      - Storage is commonly measured in bytes (B), with notation as follows:
      - Bit: Denoted as a lowercase 'b'
      - Byte: Denoted as an uppercase 'B'
      - Transfer rates for bus interfaces:
        - Kilobits (Kb/s or Kbps): 1000 bits
        - Kilobytes (KB/s or KBps): 1000 bytes
        - Megabits (Mb/s or MB/s): 1000 x 1000 bits or bytes
        - Gigabits (Gb/s or GB/s): 1000 x 1000 x 1000 bits or bytes

Universal Serial Bus (USB) Cables

  • USB Overview: Standard for connecting various peripheral devices to computers, divided into functional classes (e.g., human interface, mass storage).

  • Managed by a host controller, allowing up to 127 devices (though in practice, multiple USB controllers each with 3 to 4 ports are typically used).

USB Standards

  • Multiple USB versions exist, with updates introducing improved data rates and new connector types.

USB Connector Types

  • Type A: Connection to hosts and various peripherals, flat rectangular shape, oriented with the USB symbol facing up.

  • Type B: Square with a beveled top, used for larger devices like printers.

  • Type B Mini and Micro:
      - Mini: Smaller, previously used on early digital cameras, now less common.
      - Micro: Designed for smaller devices, such as smartphones and tablets.

USB Cables - Length and Power

  • Cable Length Specifications:
      - Low Speed: Maximum 3 m
      - Full Speed and High Speed: Maximum 5 m
      - SuperSpeed: No official max, recommended up to 3 m.

  • USB interfaces can supply power along with data signals for device charging.

HDMI and DisplayPort Video Cables

  • USB traditionally hasn't supported video due to high bandwidth demands, typically allocated to dedicated interfaces.

  • Video bandwidth determined primarily by:
      - Resolution: Defined in pixels (e.g., 1920x1200 for HD, 3840x2160 for 4K).
      - Refresh Rate: Measured in hertz (Hz) or frames per second (fps).

High-Definition Multimedia Interface (HDMI)

  • HDMI is the prevalent video interface across electronics, also supporting audio and content protection (HDCP).

  • Supports high resolutions (up to 8K) and various connectors (full-sized, mini, micro).

DisplayPort Interface

  • Developed as a royalty-free standard compared to HDMI, DisplayPort supports similar features as HDMI.

  • Includes full-size and mini versions, both keyed for correct orientation.

Thunderbolt and Lightning Cables

  • Thunderbolt: Used for displays and peripherals, compatible with DisplayPort; distinguished by a lightning icon. Version 2 supports links up to 20 Gbps.

  • Lightning: Proprietary to Apple devices, reversible design, requiring adapters for PC connections.

SATA Hard Drive Cables

  • SATA: Main method for connecting internal storage with compact 7-pin connectors.
      - Originally supported speeds of 150 MBps, with revisions to 300 MBps and 600 MBps.

Molex Power Connectors

  • A legacy connector, typically white or clear plastic with 4 pins, for powering internal devices, using color coding for voltage.

External SATA (eSATA)

  • eSATA standard: For connecting external drives (2 m limit) with specific eSATA cables required.

  • eSATAp enables powered ports compatible with both USB and SATA.

Installing and Configuring Motherboards

Motherboard Functions

  • Central processing via binary code, with software instructions executed by the CPU and temporary data storage using volatile RAM (nonpersistent). Mass storage retains data without power.

  • All components interact through bus interfaces on the motherboard, synchronized by the motherboard’s system clock (measured in MHz/GHz).

Motherboard Influence

  • The motherboard's design directly impacts system performance and compatibility with CPUs and devices. Major manufacturers include AOpen, ASRock, ASUS, Biostar, EVGA, Gigabyte, Intel, and MSI.

Electrical Safety and ESD Prevention

  • Always disconnect the computer before opening the case; drain any residual charge post-disconnection. Avoid tampering with non-serviceable components.

  • Electrostatic Discharge (ESD): Utilize anti-ESD tools (wrist straps) when handling sensitive components to mitigate risks from static charges.

Motherboard Connectors

  • Various connector types exist for CPU, memory, storage drives, and adapter cards, found in designated motherboard slots.

CPU Sockets and Support

  • Motherboards support latest CPU models, primarily Intel and AMD.
      - Chipset manages data transfers and integrated ports/interfaces. CPU sockets are square and not interchangeable across manufacturers.

System Memory Slots

  • RAM (Random-Access Memory): Supports the executing program code and data. Volatile storage using DIMMs (Dual Inline Memory Modules) fitted into color-coded/slotted designations indicating supported types.

Storage Interface Connectors

  • SATA Ports: Connect fixed internal drives or removable storage. Supported by various cable types.

  • M.2 Interface: SSDs may install as adapter cards through M.2 ports with different lengths, providing bus power.

Adapter Connectors

  • Expansion Slots: Allow installation of adapter cards (e.g., PCIe) enhancing function.

  • PCIe uses point-to-point serial connections; PCI is older technology retained for compatibility.

Motherboard Form Factors

  • ATX: The most standard form factor, dimensions of 305 mm x 244 mm, supporting multiple expansion slots.

  • Micro-ATX (mATX): Square, smaller-sized boards with limited expansion capabilities.

  • Smaller form factors (Mini-ITX) are designed for compact systems.

Motherboard Installation Procedure

  1. Familiarize with documentation; check for jumper adjustments.

  2. Align motherboard with case I/O cutout; prepare blanking plates as necessary.

  3. Insert proper standoffs ensuring compatibility and support.

  4. Optionally, install CPU and RAM prior to motherboard placement.

  5. Place and secure the board once standoffs are firm.

  6. Add power and storage devices along with any expansion components.

Power and Connector Headers

  • Power Connectors: Includes the main P1 power connector, fan connectors for CPU and chassis cooling.

  • Headers: Positions for case buttons, drive lights, audio ports, and internal USB connections.

Expansion and Video Cards

  • Different types of cards can be utilized to add capabilities not inherent to the motherboard, such as graphics processors, sound cards, and network interfaces.

Legacy Cable Types

  • DVI and VGA Links: Support digital analog connections, with VGA being phased out.

  • SCSI and IDE: Legacy interfaces once prevalent for drives, now largely supplanted by SATA, retaining specific command functionalities.

  • Adapter Cables: Used to bridge differences in connector types, with both active (signal conversion) and passive variants.

Closure of Chapter 1

  • Engage in group discussions about Chapter 1 objectives. Practical exercise: Open a PC on campus to observe component integration within a motherboard.