Domain 1: Mobile Devices Flashcards
Laptop Battery Types
Lithium Ion/Lithium Ion Polymer; no memory effect and charging the battery diminishes capacity.
Most used component of laptop
Keyboard
Laptop key replacement
Can be delicate procedure, easily damaged. Check with manufacturers’ instructions.
SO-DIMM
Small Dual In-Line Memory Module; memory found in laptops.
Memory used in laptops and mobile devices often easy to install and replace unless…
Soldered to the motherboard
If laptop memory is soldered to the motherboard…
Can’t upgrade. Full system board replacement is required
Magnetic Disk
Laptop storage space with traditional spinning drive platters. (2.5” form factors, 3.5” for desktops).
SSD (Solid State Drive)
All memory, no moving parts. Quiet, faster access time, less latency, better performance.
M.2 Interface
Smaller SO-DIMM form factor. No SATA data or power cables, easy to install.
How to replace laptop storage
Open cover on back, open entire laptop, can be modular.
M.2 Interface replacement
One screw, similar to RAM
Switching from HDD to SSD
Moving from HDD to SSD is like getting a new, faster laptop.
Installing an OS on an SSD
Migrating from HDD to SSD
~move user documents between drives. Install any required applications.
~install can be time consuming
Image/Clone HDD
Migrating from HDD to SSD
~no OS installation required
~moves everything from one drive to the other
Image/Clone HDD Requirements
Imaging software needed, sometimes included with the SSD. Many commercial and open source options
~create Image file
~drive to drive image
802.11 Wireless and Bluetooth
Wireless Network Connectivity
802.11
~Local Area Network(LAN)
~High speed
~Internet access
Bluetooth (purposes)
~Personal Area Network(PAN)
~Short range
~Connect peripherals and other nearby devices
Mini PCIe types
Wireless or wireless personal
Biometrics
The identification of a user based on a physical characteristic(e.g. fingerprint, iris, face, voice)
Biometric Components
~Software or OS
~Also hardware for most options
NFC (Near-Field Communication)
A short-range wireless communication technology that allows two devices to exchange data by touching or being in very close proximity (common on mobile phones or watches)
LCD (Liquid Crystal Display)
Technology that produces an image by filtering light through a layer of liquid crystal cells.
LCD Advantages
Lightweight, relatively low power, relatively inexpensive
LCD Disadvantages
Black levels are a challenge, requires separate backlight, lights difficult to replace
TN LCD (Twisted Nematic)
Fast response time (good for gaming), low power draw, poor viewing angles (color shifts).
IPS LCD (In-Plane Switching)
Excellent color representation, more expensive than TN.
VA LCD (Vertical Alignment)
Good compromise between TN and IPS; good color representation, slower response time than TN.
OLED (Organic Light-Emitting Diode)
Display technology where an organic compound provides light for the screen, thus eliminating the need for a backlight/inverter.
OLED Advantages
Thinner and lighter screens, flexible and mobile, no backlight, tablets+phones+smart watches
Wi-Fi Antennas
Multiple antennas; Wifi main and Aux, Bluetooth.
WiFi Antenna characteristics
~wires wrap around laptop screen.
~primary connection
~follow same path as previous wires when replacing
Webcam
A video camera for computers typically used to provide real-time video footage
Microphone
~usually built into laptop display
~not good for non-casual use
~analog or USB microphones can help
CCFL (Cold Cathode Flourescent Lamp)
An older backlighting technology that uses one or two fluorescent tubes to light a monitor panel.
~older, less common, higher voltage, thicker
LED -Backlit LDC display
~Backlight is LEDs instead of fluorescent
~LEDs around the edge of the screen
~An array of LEDs behind the screen
~The latest laptops are LED-backlit
Additional components behind LCD
~inverters: turn DC power to AC power
~backlight
~fluorescent lamp/LED
Reason why we use inverters
CCFL backlights require AC power but backlight your laptop is using uses DC power.
Determining backlight failure
~shine flashlight at screen, it information visible problem may not be the backlight.
~CCFL problem then just replace inverter
~if other problem, replace display
Digitizer
Hybrid device using keyboard and tablet like display
Digitizer characteristics
~can use pen like (stylus) device for input
~high graphic and drawing resolution inputs
Touchscreen Digitizer
Takes input from finger and convert to digital form. Can use keyboard, stylus or key presses all on same system
Connecting mobile devices
Wired and wireless
USB (Universal Serial Bus)
~primary wired connection type
~used for high speed communication
~used for charging/data transfer
Micro-USB
A smaller version of the regular USB connect. The “B” version is commonly used for tablets, Android cell phones, and other small electronic devices.
Mini-USB
A smaller version of the regular USB connector; it is also smaller than micro USB.
USB-C
The newest + most versatile type of USB connector. 24 pin double sided connector
USB-C can transmit the following…
DisplayPort, HDMI, Thunderbolt
Lightning Connection
8 pin digital signal used by Apple devices
Lightning Connector advantages
~High power output for phones and tablets
~can be inserted either way
~simple design
DB-9 Interface
~9 pin connector
~also called DE-9
~commonly used for RS-232 signals
RS-232
The recommended standard (RS) upon which all serial communication takes place on a PC.
DB-9 Connector
Type of connector with 9 pins that’s commonly used in serial communication that conforms to the RS-232 standard
NFC (uses)
Now used for mobile payment technology such as Apple Pay and Google Wallet. Access device or token as identification card to hold up to a door
Bluetooth (definition)
Wireless PAN technology that transmits signals over short distances between cell phones, computers, and other devices.
Hotspot
Your own personal wireless router.
~extend the cellular data network to all your devices.
~depends on phone type and provider
~may require additional charges and data cost
Different type of Touchpens
Touch pen stylus, Capacitive stylus, Digital stylus
Stylus
Allows you to activate interface without touching screen. Used for handwriting, note-taking, signatures, and easier to see screen and perform precise functions.
Active Stylus/Digital Stylus
Provides more precise usability than capacitive touch pen. Includes pressure sensitivity. Must be compatible with tablet or device group (e.g. Apple device needs Apple stylus)
Drawing Pad
Use an active stylus with external digitizer. Best for when using PC without any type of capacitive display or active touch screen to interact with.
Reason to use drawing pad
Get same precise input as active stylus
Trackpad
A touch-sensitive surface on which you slide your fingers to move the on-screen pointer. Can be used external using batteries or Bluetooth and functions can be customized.
Enable and disable trackpad
Some laptops have function key to enable/disable track pad to avoid mistake inputs or clicks.
Headsets
Hands-free audio. Earphones and microphone. Wired. Connects to 3.5mm TRRS connector (Tip Ring Ring Sleeve).
~Wireless are Bluetooth headsets
Apple User Headsets
May use lightning port or bluetooth
Speakers
An output device that allows you to hear voice, music, and other sounds from computer. Can be powered, wired, or wireless(using bluetooth)
Docking Station
An external device that attaches to a mobile computer or device and contains a power connection and provides connections to peripheral devices.
Reasons to use a docking station
~use external keyboard and mouse
~extend existing laptop interfaces
~avoid cable issues
~add additional functionality
~desktop adapter cards
Port Replicator
A device uses with a laptop. It remains on the desktop with external devices connected to ports on it. A laptop then needs only one connection to the port replicator to ha e access to the peripherals
What were the original 2G networks?
GSM(Global System for Mobile Communications) and CDMA (Code Division Multiple Access)
Companies that uses GSM
AT&T and T-Mobile
Companies that use CDMA
Verizon and Sprint
GSM
Mobile networking standard, 90% of market (originally an EU standard), worldwide coverage, move your SIM card from phone to phone. Used multiplexing
Multiplexing
People communicate at same time over the same frequencies.
CDMA
Everyone communicates at the same time, each call uses a different code. The codes are used to filter each call on the receiving side
3G (3rd Generation)
~introduced in 1998
~3G updates improved data speeds(usually several Mbps)
~Bandwity improvements allowed for new functionality(GPS, mobile television, video on demand)
4G LTE (Long Term Evolution)
~covered standard (CDMA + GSM providers)
~Based on GSM and EDGE (Enhanced Data Rates for GSM Evolution)
~download rates of 150Mbps
LTE Advanced (LTE-A)
Downloads rates of 300Mbps
5G
Launched in 2020 worldwide. Significantly performance improvements.
Improvements of 5G
Higher frequencies, eventually 10Gbps, slower speeds from 100-900Mbps.
Significant IoT impact (5G)
~bandwidth becomes less of a restraint
~larger data transfers
~faster monitoring and notification
~additional cloud processing
PRL (Preferred Roaming List) updates
CDMA networks. Allows phone to connect to the right tower (updated OTA; over the air)
Bluetooth Pairing Process
- Enable Bluetooth on both devices
- Set devices to discoverable (search) mode
- Select discovered device (multiple devices may appear)
- Enter or confirm pin
- Test connectivity
How does GPS (Global Positioning System) work?
Over 30 satellites in orbit, device needs to see at least 4 for accurate location.
Other ways cell phones accurately give location
May determine physical location based on WiFi and cellular towers.
MDM (Mobile Device Management)
Manage company-owned and user-owned mobile devices.
BYOD
Bring Your Own Device
Benefits of MDM
allows for centralized management of the mobile devices.
Features of MDM
Set policies on apps, data camera, etc. Manage access control(e.g. screen timeout, PIN) Partition device
Partition
Keeping user-data separate from company data
Corporate Email configuration
(MDM config)
~user does not need to configure anything.
~MDM makes the changes on the device.
~Account details, server address, communication method.
Two-Factor Authentication
Require specific authentication types(Biometrics, authentication app)
Corporate Applications
~Allow/restrict app installation
~prevent unauthorized app usage
Configuring a mobile device
Many settings are pre-configured(telephone/text messaging). Email, data synchronization
Microsoft 365
Outlook, Exchange
-Microsoft email service
-same for Hotmail and Outlook.com
Authenticate to Microsoft 365
Username, password. Select items to synch.
(Same process for Google Workspace)
iCloud
Integrated into iOS and iPadOS
-provide a username and password
Configuring iCloud
Select synch options(what to and not to synch), can be synced to macOS. Sign into device with credentials to access synced data
iCloud Data Types
Mail, pictures, music, video, calender, contacts.
Data caps and transfer costs
Downlaod data over Cellular vs WiFi (802.11)
~enable/disable network connections.
~control use of cellular downloads.
