Section 1: Mobile Device (Notes) Flashcards
NFC
- It allows smartphones to communicate with each other via radio frequencies by touching them together or in some cases by having them in close-proximity to each other.
- The Radio Frequency is 13.56Mhz
- it transmits 100 to 400 Kb/s
(NFC is also used for close-proximity transactions, such as contactless payments)
S/MIME
(Secure/ Multipurpose Internet Mail Extensions)
- It’s used for authentication and message integrity and it’s built into some email clients. In other words it encrypt emails.
IMSI ID
(International Mobile Subscriber Identity)
- It’s used to identify the user of the device.
- For GSM, UMTS, LTE networks it’s loaded into the Subscriber Identity Module (SIM Card).
- For CDMA (Code Division Multiple Access) network is loaded directly into the phone or to a removable user identity module (R-UIM) which is similar to a SIM Card
IMEI ID
(International Mobile Equipment Identity)
- It’s used to identify the phone that is being used
- New Devices: Settings -> General -> About
- Old Devices: It’s printed inside the phone either on or near the battery.
SSO
(Single Sign-On)
- is when a user is authenticated to multiple services simply by logging in with a single username and password (it’s all linked together)
- This is a type of a Federated Identity Management (FIM)
POP3 and IMAP
(Post Office Protocol version 3 ; Internet Message Access Protocol)
- They both require a username, password and a SMTP (Simple Mail Transfer Protocol) server
POP3
Original Port: 110
Secure Port: 995
IMAP
Original Port: 143
Secure Port: 993
SMTP
Original Port: 25
Secure Port: 465 or 587
PRL
(Preferred Roaming List)
- It utilizes CDMA technology instead of GSM
- It’s a database on a mobile device containing radio bands, sub-bands and service provider IDs allowing the device to establish connection with the right cell phone tower.
Basebands
- It’s also referred to as Radio Firmware that controls network connectivity for GSM
- The phone and its Radio functions are controlled by a chip and software package.
IoT
(Internet of Things)
- A computing concept that describes a future where everyday physical objects will be connected to the Internet and be able to identify themselves to other devices.
- Physical Objects: refrigerators, digital thermostats, home automation devices, medical, manufacturing, and transportation industries, among others.
Inverter
It’s a device that converts DC (Direct Current) voltage that comes from the motherboard into AC (Alternating Current) voltage to be used by the display’s backlight
Backlight
is a bulb (Cold Cathod Fluorescent Lamp; CCFL), it emits light through the screen so that you can see the image that the computer is attempting to display.
LCD
(Liquid-Crystal Display)
- They have replaced CRTs (Cathode-ray tube) as the display of choice for desktop computer users.
- Most LCDs screens are Thin-Film Transistor (TFT) or active-matrix displays
- They generate small amount of heat
- They use more electricity than newer types of displays because they utilize a high-powered bulb, quite often a Cold Cathode Fluorescent Lamp (CCFL).
