Chapter 3: Peripherals, Cables & Connectors

A+ Core 1 — 220-1101 | Domain 3.1

Chapter 3:
Peripherals, Cables & Connectors

Display technologies, input devices, USB standards, Thunderbolt, video cables, and storage interfaces. The physical connections that tie a system together.

23 Slides Domain 3.1 USB • Thunderbolt • Video • Display • Audio Exam 220-1101

Slide 2 of 23

Display Technologies

LCD, OLED, and the panel types that determine image quality characteristics.

LCD — Liquid Crystal Display

Most common display technology. Liquid crystals modulate light from a backlight to create images. Cannot produce light without a backlight source. Low power consumption, lightweight, thin profile. Requires inverter board if using CCFL backlight (older monitors). LED backlight = no inverter needed.

OLED — Organic LED

Each pixel produces its own light — no backlight required. True blacks: pixels turn off completely. Infinite contrast ratio. Thinner form factor. Better viewing angles. Used in premium phones and monitors. Downside: potential burn-in with static images. Shorter lifespan than LCD for static content.

LCD Panel Types

TN (Twisted Nematic): Fastest response (<1 ms). Cheapest. Poor viewing angles and color. Best for competitive gaming.
VA (Vertical Alignment): Best contrast ratio. Slower response. Good for movies.
IPS (In-Plane Switching): Best color accuracy and viewing angles. Premium price. Best for design work.

Backlight Sources

LED: Light-emitting diodes. No inverter required. Thinner. More efficient. Better contrast. Current standard.
CCFL: Cold Cathode Fluorescent Lamp. Older laptops and monitors. Requires an inverter board. Thicker. Higher power. If inverter fails, display goes dark.

Exam Tip

LCD needs a backlight (LED or CCFL). OLED pixels create their own light — no backlight layer. OLED offers better blacks and contrast. LCD offers longer lifespan for static content (no burn-in risk). Know which panel type best suits each workload.

Slide 3 of 23

Display Settings & Features

Resolution, refresh rate, and multiple monitor configurations.

Resolution Name	Pixels	Aspect Ratio
HD (720p)	1280 × 720	16:9
Full HD (1080p)	1920 × 1080	16:9
QHD (1440p)	2560 × 1440	16:9
4K UHD	3840 × 2160	16:9

Native Resolution

The pixel count the panel was designed for. Running at native resolution produces the sharpest image. Running below native = upscaled and blurry. Running above native = downsampled. Always configure display to its native resolution for best clarity.

Refresh Rate

How many times per second the display updates. Measured in Hz. 60 Hz: Standard office/productivity. 120–144 Hz: Smooth gaming, reduced motion blur. 240+ Hz: Competitive gaming. Higher refresh rate requires more GPU bandwidth.

Multi-Monitor Modes

Extended: Expands desktop across monitors — each has its own area. Most productive. Duplicate/Mirror: Same image on both screens — used for presentations. Primary: The monitor designated to show the taskbar and notification area in Windows.

Additional Display Features

Privacy filter: Physical screen attachment that limits viewing angle — prevents shoulder surfing. Anti-glare filter: Reduces reflections in bright environments. Projector brightness: Measured in lumens — higher lumens required for well-lit rooms.

Slide 4 of 23

Input & Output Devices

Classifying peripherals by data direction — an A+ foundational concept.

Input Devices

Standard: Keyboard, mouse, touchpad, game controller, webcam, microphone.
Specialty: Signature pad, barcode/QR scanner, magnetic stripe reader, EMV chip reader, NFC/tap pay device, biometric scanner (fingerprint).
Input = sends data FROM user TO computer.

Output Devices

Standard: Monitor, projector, speakers, headphones, printer.
Output = sends data FROM computer TO user.
Monitor is the primary output device in almost all computing contexts. Projectors measured in lumens for brightness; higher lumens = visible in brighter rooms.

Both Input & Output

KVM Switch: Keyboard, Video, Mouse switch. Shares one set of peripherals across multiple computers. Useful in data centers and multi-system setups.
Scanner: Input for digitizing documents. Some models include printing (MFP).
Touchscreen: Input via touch + output via display.

Audio Jacks (Color-Coded)

Motherboard rear audio jacks follow a standard color convention:
Green = Line out (speakers/headphones).
Pink = Microphone in.
Blue = Line in (external audio source).
USB headsets bypass all analog jacks — they include their own audio processing.

NAS — Network Attached Storage

A file server connected to the network. Acts as both input (can receive data to store) and output (serves stored data). Supports RAID for redundancy. Used for centralized file access, video streaming, and backups. Accessible to multiple clients simultaneously.

Slide 5 of 23

USB Standards & Speeds

Version history, transfer rates, and port color codes — heavily tested on A+.

Version	Year	Speed	Trade Name	Port Color
USB 1.1	1998	12 Mbps	Full-Speed	White
USB 2.0	2000	480 Mbps	Hi-Speed	Black
USB 3.0	2008	5 Gbps	SuperSpeed	Blue
USB 3.1	2013	10 Gbps	SuperSpeed+	Teal
USB 3.2	2017	20 Gbps	SuperSpeed+	Red
USB4	2019	40 Gbps	USB4	USB-C connector

Exam Tip — Memorize the Color Codes

White = 1.1 (12 Mbps). Black = 2.0 (480 Mbps). Blue = 3.0 (5 Gbps). Teal = 3.1 (10 Gbps). Red = 3.2 (20 Gbps). USB 2.0 at 480 Mbps is one of the most frequently tested A+ values. Note: not all manufacturers follow color standards — but the A+ exam does.

Slide 6 of 23

USB Connector Types

Physical connector form factors and their typical device associations.

Type-A

The standard rectangular USB connector found on nearly all computers, hubs, and chargers. The "host-side" connector in traditional USB. Exists in USB 2.0 and USB 3.x versions (blue insert for USB 3.x). Not reversible — can only insert one way.

Type-B

Square-ish connector with two angled top corners. Commonly found on printers, scanners, and USB hubs as the device-side connector. USB 3.0 Type-B has an extra row of pins at the top for SuperSpeed lanes. Larger than Type-A.

Micro-USB

Small, trapezoidal connector. Used on older Android phones, Bluetooth devices, digital cameras, and portable power banks. USB 2.0 Micro-B is most common. USB 3.0 Micro-B has an extra wider section for SuperSpeed. Being replaced by USB-C.

Mini-USB

Older small connector, larger than Micro-USB. Used on early digital cameras, GPS units, and some older MP3 players. Largely obsolete — replaced by Micro-USB and then USB-C. Still present on some older industrial and embedded devices.

USB-C

Reversible oval connector. Supports USB 2.0 through USB4 (40 Gbps) depending on the device. Carries data, video (DisplayPort Alt Mode), and power (USB PD up to 240W). The universal modern standard. Thunderbolt 3/4 uses the USB-C connector. Not all USB-C ports support all features — check device spec.

USB Power Delivery

USB Battery Charging 1.0 (2007): 5V, 1.5A (7.5W). USB PD 1.0 (2012): up to 100W. USB PD 3.1 (2021): up to 240W at 48V. USB-C with PD can charge laptops, monitors, and even some smaller workstations. Negotiates voltage and current between devices automatically.

Slide 7 of 23

Thunderbolt Technology

Intel’s high-speed interface combining data, video, and power into a single connection.

Version	Year	Speed	Connector	Key Features
Thunderbolt 1	2011	10 Gbps	Mini DisplayPort	Combined data + display
Thunderbolt 2	2013	20 Gbps	Mini DisplayPort	4K video support
Thunderbolt 3	2015	40 Gbps	USB-C	Two 4K displays, 100W power
Thunderbolt 4	2020	40 Gbps	USB-C	Two 4K or one 8K, PCIe tunneling

Thunderbolt vs. USB-C

Thunderbolt 3 and 4 use the USB-C physical connector but are NOT the same as USB-C. Thunderbolt ports carry a lightning bolt symbol. A USB-C cable in a Thunderbolt port will work as USB — but a Thunderbolt device in a USB-C-only port will not get Thunderbolt speeds. Thunderbolt 4 requires certified Thunderbolt 4 cables for full 40 Gbps.

Thunderbolt Daisy-Chaining

Thunderbolt 3/4 supports daisy-chaining up to 6 devices on a single port. Each device passes the signal to the next. The final device in the chain can be a display. Useful for connecting multiple external drives, docks, and monitors from a single laptop Thunderbolt port. Each device must support Thunderbolt (not just USB-C).

Slide 8 of 23

Video Cables & Connectors

VGA, DVI, HDMI, and DisplayPort — each with distinct capabilities and connector shapes.

VGA — Video Graphics Array

Analog signal only. Blue 15-pin D-sub connector (DE-15, HD-15). Maximum practical length: 5–10 meters before signal degradation. Still found on projectors and legacy monitors. Cannot carry audio. Requires analog-to-digital conversion for digital displays (active adapter needed).

DVI — Digital Visual Interface

Transitional standard. Three variants:
DVI-A: Analog only — VGA compatible.
DVI-D: Digital only. Single or Dual Link.
DVI-I: Integrated — both analog and digital. Single or Dual Link.
Dual Link doubles bandwidth for resolutions up to 2560×1600. Identified by extra pins in the center cluster.

HDMI — High-Definition Multimedia Interface

Digital audio AND video in a single cable. Most common modern consumer standard. Maximum cable length: ~20 meters (passive). Connector variants: Standard, Mini-HDMI (Type C), Micro-HDMI (Type D). HDMI 2.1 supports 4K/120Hz and 8K/60Hz. Common on TVs, monitors, laptops, and consoles.

DisplayPort

VESA open standard — no royalty fees. Locking connector prevents accidental disconnect. Higher bandwidth than HDMI 2.0. Compatible with HDMI and VGA via passive or active adapters. DisplayPort 2.1 supports 16K. Common on PC monitors and discrete GPUs. Mini DisplayPort = same protocol, smaller connector (used on older MacBooks).

Exam Summary

VGA = analog only, 15-pin blue. DVI-A/D/I = A (analog), D (digital), I (both). HDMI = audio + video combined. DisplayPort = VESA standard, locking connector. Know DVI variants: the letter tells you what signal it carries.

Slide 9 of 23

Storage Cables & Interfaces

SATA, eSATA, PATA, and SAS — internal and external storage connections.

SATA (Internal)

7-pin L-shaped data connector. 15-pin power connector (separate). Backward compatible across SATA I/II/III. SATA I: 1.5 Gbps. SATA II: 3 Gbps. SATA III: 6 Gbps (~550 MB/s practical). Standard for HDDs and 2.5" SSDs. Maximum cable length: 1 meter.

eSATA (External)

External SATA. Same protocol as internal SATA but designed for external hot-swap drives. eSATAp (eSATA + USB power) provides power through the connector. Does NOT provide power on its own — device needs separate power cable or eSATAp port. Being replaced by USB 3.x and Thunderbolt for external storage.

SAS (Serial Attached SCSI)

Enterprise storage. SAS-1: 3 Gbps. SAS-2: 6 Gbps. SAS-3: 12 Gbps. SAS-4: 22.5 Gbps. Dual-port connections for redundant paths. SAS controllers accept SATA drives; SATA controllers do NOT accept SAS drives. Used in server environments requiring 24/7 reliability and high drive counts.

PATA / IDE (Legacy)

Parallel ATA. 40-pin wide ribbon cable. Master/Slave jumper configuration per cable. Maximum 133 MB/s (UDMA 6). Still appears on A+ exams. Replaced by SATA circa 2003. Look for wide ribbon cable as the visual identifier in troubleshooting questions.

SCSI (Legacy)

Small Computer System Interface. Parallel SCSI used wide ribbon cables. Supported multiple devices on a single bus (up to 15 devices). Largely replaced by SAS for enterprise use. USB/Thunderbolt for consumer use. Still referenced on A+ for legacy system familiarity.

Slide 10 of 23

Serial & Legacy Connectors

DB-9 serial, Molex, and other connectors that still appear in A+ scenarios.

Serial Port (DB-9 / RS-232)

9-pin D-sub connector. Sends data one bit at a time (serial). Maximum 115,200 baud in legacy applications. Still actively used for: network equipment console access (routers, switches, managed switches), industrial control systems, POS terminals, and legacy scientific equipment. USB-to-serial adapters are common for modern computers lacking built-in serial ports.

Parallel Port (DB-25 / Centronics)

25-pin D-sub on computer side, 36-pin Centronics on printer side. Sends 8 bits simultaneously over 8 data wires. Was the standard printer connection before USB. Also used for some legacy scanners and external storage devices. Completely obsolete in modern systems — no new hardware includes it.

Molex Connector

4-pin power connector from the PSU. Originally the standard for HDD and optical drive power. Now used for fans, case lighting, and some legacy devices. Can be adapted to SATA power with a Molex-to-SATA adapter. Being phased out as SATA power has become universal.

PS/2 Connector

Small 6-pin DIN connector for legacy keyboards and mice. Color-coded: purple = keyboard, green = mouse. Hot-swapping not supported — must be connected at boot. Still present on some server motherboards for crash-consistent access. USB has entirely replaced PS/2 in consumer systems.

RJ-45 & RJ-11

RJ-45: 8-pin modular connector for Ethernet. Wider than RJ-11. Used on all wired network adapters.
RJ-11: 4 or 6-pin modular connector for telephone lines. Narrower than RJ-45. Used on modems and phone landlines. RJ-11 fits in RJ-45 jack but does not make an Ethernet connection.

Slide 11 of 23

Lightning Connector & USB Adapters

Apple’s proprietary connector and useful USB conversion scenarios.

Lightning Connector (Apple)

Apple proprietary 8-pin connector. Reversible — can be inserted either way. Used on iPhones through iPhone 14 and older iPads. iPhone 15 and later switched to USB-C. USB 2.0 speeds in most implementations (480 Mbps). Carries data, audio, and power. MFi (Made for iPhone) certification required for accessories.

USB to Ethernet Adapter

Adds wired network capability to devices without built-in Ethernet. Common on ultra-slim laptops, tablets, and Chromebooks. USB 3.0 to Gigabit Ethernet adapters are most common. USB-C versions also widely available. Speed limited to USB bandwidth — USB 3.0 can support full Gigabit Ethernet throughput. Required when Wi-Fi is unreliable or prohibited.

DisplayPort to HDMI

Passive adapters work for standard resolutions. Active adapters required for 4K/HDR over longer cables or with single-link limitations. Common for connecting newer DisplayPort GPU outputs to HDMI monitors and TVs. DisplayPort Alt Mode on USB-C can also drive HDMI with the right adapter.

VGA to HDMI

Requires an active adapter because VGA is analog and HDMI is digital. The adapter includes a small ADC chip. Cannot simply use a passive cable. One-directional: VGA source to HDMI display (not the reverse). Audio must be handled separately or through the adapter’s audio input if supported.

USB-C Hubs & Docks

USB-C hubs expand one USB-C port into multiple ports (USB-A, HDMI, SD card, Ethernet). Docking stations are larger and include power delivery to charge the laptop. Common for ultrabooks with only USB-C ports. Check power delivery wattage — some hubs cannot charge high-power laptops.

Slide 12 of 23

Wireless Peripherals

Bluetooth, Wi-Fi enabled devices, and NFC for the A+ exam.

Bluetooth

Short-range wireless standard. Range: typically 10 meters (Class 2) to 100 meters (Class 1). Used for: keyboards, mice, headsets, speakers, phones, printers. Pairing process: discoverable mode, accept pairing code. Bluetooth 5.0 doubled range and quadrupled speed vs. 4.2. Operating frequency: 2.4 GHz (same band as Wi-Fi — may cause interference).

2.4 GHz USB Dongle

Proprietary wireless receiver for keyboards, mice, and gamepads (Logitech Unifying Receiver, etc.). Uses 2.4 GHz band. Plug-and-play — no pairing required. The dongle and device are pre-paired at the factory. Some receivers support multiple devices. Lower latency than Bluetooth for gaming peripherals.

NFC — Near Field Communication

Very short range: <4 cm. Used for: contactless payments (tap-to-pay), access badges, NFC tags for automation, Bluetooth pairing initiation. Operates at 13.56 MHz. Passive NFC tags require no power — powered by the reader’s electromagnetic field. Active NFC devices (phones, readers) have their own power.

A user’s wireless keyboard has intermittent connectivity when another user is on a video call on the same desk. Both use 2.4 GHz. The Wi-Fi, Bluetooth keyboard, and the nearby microwave are all competing on the same 2.4 GHz spectrum. Switching the keyboard to a 5 GHz capable model or using a wired keyboard resolves the interference.

Slide 13 of 23

KVM Switches & Specialty Devices

Multi-system control, payment terminals, and digitizers for the A+ exam.

KVM Switch

Keyboard, Video, Mouse switch. One set of peripherals controls multiple computers. Switch between machines with a button press or keyboard shortcut. Available as hardware KVM (physical switch box) or software KVM (over IP or network). Common in data centers, server rooms, and multi-system developer workstations.

Payment Terminal Devices

Magnetic stripe reader: Reads credit/debit card magnetic strip. Oldest technology, vulnerable to skimming.
EMV chip reader: Reads smart card chip. More secure than magnetic stripe.
NFC/tap reader: Contactless payment (Apple Pay, Google Pay). Fastest transaction type.
Signature pad: Captures handwritten signatures digitally for transaction records.

Barcode & QR Scanners

1D barcodes (UPC): single row of vertical lines. Scanned by linear laser. 2D barcodes (QR codes): matrix of dots. Scanned by camera or 2D imager. Used in retail POS, inventory management, shipping, and manufacturing. Connect via USB (HID keyboard emulation) or Bluetooth.

Digitizers & Drawing Tablets

Pressure-sensitive surface that translates stylus movement to on-screen drawing. Used by graphic designers, architects, and digital artists. Stylus pressure levels determine line width. Some displays include built-in digitizers (Microsoft Surface, iPad with Apple Pencil). Connect via USB or Bluetooth.

VR Headsets

Immersive display worn on head. Computer-connected VR (tethered): high-quality rendering using GPU. Standalone VR (self-contained processor). Augmented Reality (AR): overlays digital information on real-world view. Used in gaming, training simulations, and design visualization. Connect via USB, DisplayPort, or wireless (Wi-Fi 6).

Slide 14 of 23

Cable Specifications & Best Practices

Cable quality, length limits, and management practices that affect reliability.

USB Cable Lengths

USB 2.0: max 5 meters per segment. USB 3.x: max 3 meters (passive). Active extension cables or USB hubs extend this. USB cables beyond spec length suffer signal degradation: devices not recognized, intermittent disconnects, or reduced speed. Always use shortest cable that reaches for best performance.

HDMI Cable Lengths

Passive HDMI: up to ~15 meters for standard (1080p). ~5 meters recommended for 4K/60Hz. Active HDMI cables extend to 30+ meters using built-in signal amplification. Fiber optic HDMI cables support up to 100 meters. Premium HDMI certification (48 Gbps) required for HDMI 2.1 features.

Cable Management

Poor cable management: restricts airflow, creates tripping hazards, causes accidental disconnects. Best practices: route cables along case edges, use Velcro ties (not zip ties that cannot be removed), keep power and data cables separated where possible, label both ends of cables in server environments.

Plenum vs. Non-Plenum Cabling

Plenum-rated cables (CMP) are required for installation in air-handling spaces (above suspended ceilings, in HVAC plenums). Plenum cables use fire-retardant, low-smoke jackets. Non-plenum (CMR, riser-rated) cannot be used in plenum spaces. Using the wrong cable type in plenum spaces violates fire codes and may create toxic smoke hazards.

Thunderbolt Cable Quality

Not all USB-C cables support Thunderbolt speeds. Thunderbolt 3/4 at 40 Gbps requires certified Thunderbolt cables. Standard USB-C cables work for USB but may not support full Thunderbolt bandwidth. Thunderbolt 4 cables are backward compatible with Thunderbolt 3. Always use cables rated for the intended protocol.

Slide 15 of 23

Connector Quick Reference

Pin counts, identifiers, and signals — all exam-critical connector facts in one place.

Connector	Pins	Signal Type	Typical Use
VGA (DE-15)	15	Analog video only	Legacy monitors, projectors
DVI-D Single Link	19	Digital video	Monitors up to 1920×1200
DVI-I Dual Link	29	Analog + digital	Monitors up to 2560×1600
HDMI Standard (Type A)	19	Digital audio + video	TVs, monitors, consoles
DisplayPort	20	Digital audio + video	PC monitors, GPUs
USB Type-A	4 (USB2) / 9 (USB3)	Data + power	Host port on computers
USB-C	24	Data + power + video	Modern devices, laptops
RJ-45	8	Ethernet data	Network cables, NICs
3.5mm TRS	3 (stereo)	Analog audio	Headphones, speakers, mic

Slide 16 of 23

Interface Speed Reference

All major interfaces ranked by maximum transfer rate.

Interface	Max Speed	Notes
PATA/IDE	133 MB/s	Legacy, ribbon cable
USB 2.0	480 Mbps (60 MB/s)	Hi-Speed, most common legacy USB
SATA III	6 Gbps (550 MB/s practical)	Current SSD/HDD standard
USB 3.0	5 Gbps (500 MB/s)	SuperSpeed, blue port
USB 3.1	10 Gbps	SuperSpeed+, teal port
USB 3.2	20 Gbps	SuperSpeed+, red port
Thunderbolt 3/4	40 Gbps	USB-C connector, PCIe tunneling
USB4	40 Gbps	USB-C, Thunderbolt 3 compatible
NVMe PCIe 5.0 x4	~12,000+ MB/s	Storage only (not peripheral interface)

Critical A+ Values

USB 2.0 = 480 Mbps. USB 3.0 = 5 Gbps. SATA III practical max = ~550 MB/s = 4.4 Gbps. Thunderbolt 3/4 = 40 Gbps. These four values appear repeatedly across A+ Core 1 exam questions.

Slide 17 of 23

Troubleshooting Display Issues

Common display failure symptoms and their most likely root causes.

No Display / Black Screen

Check: cable connection at both ends. Correct input source selected on monitor. Monitor powered on. Try a known-good cable. If GPU has multiple outputs, try a different port. Boot into iGPU by reseating or removing discrete GPU to isolate the issue. Check if monitor self-test works (built-in test without signal source).

Flickering / Artifact Display

Loose or damaged cable (especially VGA where pins can be bent). Failing GPU (artifacts, corruption in 3D). Driver issue: revert or update GPU driver. Refresh rate mismatch: set to native 60/144 Hz. Overheating GPU: check temps and fan operation. On laptops: inverter failure (CCFL backlight flickers before dying).

Wrong Resolution / Blurry

Display not set to native resolution in OS settings. Generic driver installed instead of manufacturer driver — may not know native resolution. EDID handshake failure: try a different cable. Multi-monitor setup where one monitor’s settings affect the other. Check Display Settings in Windows — verify each monitor’s resolution independently.

Dead Pixels

Permanently stuck or dead pixels in an LCD are a panel defect. A stuck pixel displays one color constantly (red, green, blue). A dead pixel is always black. Most manufacturers have a dead pixel policy — check warranty terms. Cannot be repaired by a technician — requires panel replacement.

OLED Burn-In

Permanent discoloration of OLED pixels from prolonged static images (taskbar, HUD, desktop icons). Prevent with screen savers, auto-brightness, and moving static UI elements. Cannot be repaired — prevention is the only solution. Less of a concern on modern OLED panels with pixel-shift technology.

Slide 18 of 23

Troubleshooting USB Issues

Device not recognized, power issues, and speed degradation scenarios.

Device Not Recognized

Try a different USB port. Try a different cable. Check Device Manager for unknown devices or error codes. Reinstall device driver. Reset USB controller in Device Manager (uninstall USB Root Hub, rescan). Try on a different computer to isolate device vs. computer issue. Check if device requires external power (some high-draw devices exceed USB port power budget).

Speed Slower Than Expected

USB 3.x device connected to USB 2.0 port: check port color and host controller. USB extension cable exceeding spec length. USB hub introducing latency or sharing bandwidth. Driver issue: check if USB 3.x host controller drivers are current. Third-party USB controller card needed if motherboard USB 3.x is faulty.

Intermittent Connection

Faulty cable (most common). Loose port on the device. USB selective suspend putting device in low-power state — disable in Power Options. Insufficient power from USB port (external HDDs need USB-Y cable or powered hub). Check for USB port damage (bent internal pins).

Power Delivery Issues

USB-C PD negotiation failure: ensure cable is rated for PD, not just data. Some USB-C cables are charge-only (no data pins). USB-C to HDMI adapter: check if DisplayPort Alt Mode is supported on the host port — not all USB-C ports support video output. Thunderbolt features require certified Thunderbolt cable and Thunderbolt host port.

Windows USB Error Codes

Code 43: Device failed to identify — try different port, update driver, or replace device. Code 10: Device cannot start — update driver. "USB device not recognized" balloon: device drawing too much current or damaged. Check if port has power with a known-good USB device before replacing the original device.

Slide 19 of 23

Peripheral Installation Best Practices

Driver management, Plug and Play, and platform-specific considerations.

Plug and Play (PnP)

Windows automatically detects most USB devices and installs a basic driver. PnP devices assign resources (IRQ, I/O address) automatically — no manual jumper configuration. For full functionality: install manufacturer’s driver. Use Windows Update or manufacturer website for drivers. Device Manager shows all installed devices and their status.

Driver Management

Always download drivers from the manufacturer’s official website. Unsigned drivers require elevated permissions in Windows. After driver update: reboot required for most device types. Rolling back a driver: Device Manager > Properties > Driver > Roll Back. Keeping drivers current prevents security vulnerabilities and compatibility issues.

macOS Peripherals

macOS uses System Preferences > Displays for monitor configuration. USB devices generally work without additional drivers (PnP). Printer installation: Add Printer wizard; AirPrint printers often detected automatically. Third-party drivers from developer-signed packages only. Check Security & Privacy if a driver is blocked after installation.

Linux Peripherals

Most USB devices use kernel-level drivers — no installation required. Some proprietary devices (certain WiFi adapters, specialized peripherals) need manual driver installation. Use lsusb to list connected USB devices. Use dmesg | grep usb to diagnose connection issues. CUPS (Common Unix Printing System) manages printers.

Shared Peripherals

Network printers: share via Windows Print Spooler or direct IP printing. USB devices can be shared across a network using USB over Ethernet software or USB server hardware. Bluetooth peripherals typically pair to one device at a time (some support multi-device switching). KVM switches share keyboard, video, and mouse hardware across multiple systems.

Slide 20 of 23

Exam Practice: Quick Questions

Six A+ style scenario questions — answers in gold.

Q1

A technician connects an external drive via USB but Windows shows it as USB 2.0 speed, not USB 3.0. What is the most likely cause? — The drive is connected to a USB 2.0 port (black). Move it to a blue USB 3.0 port for SuperSpeed performance.

Q2

A user wants to connect a Thunderbolt 3 external GPU to a laptop. The laptop has USB-C ports but no Thunderbolt. Will it work? — No. Thunderbolt 3 requires a Thunderbolt-capable port. USB-C only provides USB speeds, not PCIe tunneling required for eGPU.

Q3

A monitor’s display is dim but visible. The backlight appears to be failing. What technology would require replacing the inverter board? — CCFL-backlit LCD. LED-backlit displays do not have inverter boards. The CCFL inverter is a common failure point in older laptops and monitors.

Q4

A cable runs through an air plenum above a suspended ceiling. Which cable rating is required? — CMP (Plenum-rated). Standard CMR (riser-rated) cable is not permitted in plenum air-handling spaces due to fire code requirements.

Q5

A DVI cable with extra pins in the center cluster is which specific type? — DVI-I (Integrated) — the extra four analog pins in the cross configuration around the flat blade carry the analog VGA signal.

Q6

Which USB connector is commonly found on the device side of printers? — USB Type-B — the square-ish connector with two angled top corners. The computer side uses Type-A.

Slide 21 of 23

Key Vocabulary

Chapter 3 terms organized by category.

Display

TN/VA/IPS — LCD panel types by performance trade-off
LED / CCFL — LCD backlight types
OLED — self-emissive pixels, no backlight
Native resolution — sharpest display at panel’s designed pixel count
Refresh rate (Hz) — frame updates per second

USB & High-Speed

USB 2.0 = 480 Mbps (Black)
USB 3.0 = 5 Gbps (Blue)
USB 3.1 = 10 Gbps (Teal)
USB 3.2 = 20 Gbps (Red)
Thunderbolt 3/4 = 40 Gbps (USB-C connector)
USB PD — Power Delivery up to 240W

Cables & Connectors

VGA — analog, 15-pin, blue
DVI-A/D/I — analog/digital/integrated
HDMI — audio + video, 19-pin
DisplayPort — VESA standard, locking
RJ-45 — Ethernet, 8-pin
Lightning — Apple 8-pin proprietary (pre-iPhone 15)

Slide 22 of 23

Exam Drill: Fast Facts

Speed review — cover the gold text and test yourself before the summary.

1

USB 2.0 speed: 480 Mbps (Hi-Speed). Black port.

2

USB 3.0 speed and port color: 5 Gbps SuperSpeed. Blue.

3

Thunderbolt 3 uses which physical connector? USB-C. Identified by lightning bolt symbol.

4

DVI variant that carries both analog and digital signal: DVI-I (Integrated).

5

Display technology with no backlight, true blacks: OLED. Each pixel produces its own light.

6

Cable type required in HVAC plenum spaces: CMP (Plenum-rated). Not riser-rated CMR.

7

What color are 3.5mm line-out (speaker/headphone) jacks? Green.

8

Maximum passive USB 3.0 cable length: 3 meters. USB 2.0 max is 5 meters.

Slide 23 of 23 — Chapter 3 Complete

Chapter 3 Summary

Eight key takeaways from Peripherals, Cables & Connectors.

1

LCD needs a backlight (LED or CCFL). OLED pixels emit their own light. TN = fast/cheap, VA = best contrast, IPS = best color/viewing angles. CCFL monitors have inverter boards; LED monitors do not.

2

USB color codes: White=1.1 (12Mbps), Black=2.0 (480Mbps), Blue=3.0 (5Gbps), Teal=3.1 (10Gbps), Red=3.2 (20Gbps). USB4=40Gbps (USB-C).

3

Thunderbolt 3/4 uses the USB-C physical connector but is NOT USB-C. Identified by a lightning bolt symbol. Supports 40 Gbps, daisy-chaining, and PCIe tunneling. Requires certified Thunderbolt cables.

4

DVI variants: A = Analog only. D = Digital only. I = Integrated (both). Dual Link adds bandwidth for higher resolutions (up to 2560×1600). Identified by extra pin cluster.

5

HDMI carries audio AND video in one cable. VGA is analog video only. DisplayPort is the VESA open standard with a locking connector. Know these three for display cable identification.

6

SAS controllers accept SATA drives; the reverse is not true. eSATA does not provide power — device needs separate power. RJ-45 (Ethernet, 8-pin) is wider than RJ-11 (phone, 4-6 pin).

7

Plenum-rated (CMP) cable is required in air-handling spaces above suspended ceilings. Riser (CMR) is not acceptable in plenum spaces. Violating this is a fire code violation.

8

Audio jacks: Green = line out. Pink = microphone in. Blue = line in. USB headsets bypass all analog jacks. KVM switches share keyboard, video, mouse across multiple computers.