Mobile Devices - Wireless and Cellular Data Connections Flashcards
What are the mobile generations?
2G
2.5G
Edge 2.75G
3G
4G
5G
What are the characteristics of 2G?
Second generation (2G) networks were the first to offer digital data services. 2G data speeds are slow and mainly used for text messaging, not internet connectivity.
What speed is 2.5G?
Up to 144 Kbps
What are the characteristics of EDGE and what speeds can they achieve?
EDGE (also called 2.75G) networks are an intermediary between 2G and 3G networks. EDGE is the first cellular technology to be truly internet compatible. EDGE supports speeds of 400–1,000 Kbps.
What are the characteristics of 3G and what speeds can they achieve?
3G offers simultaneous voice and data. Minimum speeds for stationary users are quoted at 2 Mbps or higher.
What two extensions enhance 3G networks?
HSPA+ - Evolved High Speed Packet Access (HSPA+) is also called smart antenna. It uses multiple-input and multiple-output (MIMO). It significantly increases data throughput and link range without additional bandwidth or increased transmit power.
LTE - Long Term Evolution (LTE) increases downlink/uplink speeds to 100/50 Mbps, while LTE-Advanced increases downlink/uplink speeds to 1Gbps/500Mbps.
What are the characteristics of 4G and what speeds can they achieve?
4G is available with minimum speeds around 3–8 Mbps and over 100 Mbps possible.
Characteristics:
1. Uses MIMO.
2. Is not compatible with 3G; 4G requires a complete retrofit on the part of service providers and new equipment for the consumer.
3. Utilizes Worldwide Interoperability for Microwave Access (WiMAX). WiMAX delivers high-speed internet service (up to 1 Gbps for stationary users) to large geographical areas.
What are the characteristics of 5G and speeds can they achieve?
5G can achieve speeds twenty times faster than 4G with peak speeds of 20 Gb per second.
Characteristics:
1. Uses MIMO.
2. Includes lower frequencies than previous generations, down to 600 MHz.
3. Uses LTE for wireless connections.
What is a hotspot?
A hotspot is a physical location where you can obtain wireless internet access using a wireless local area network (WLAN) with a router connected to an internet service provider.
What is tethering?
Tethering is connecting one device to another to share the internet connection of the phone or tablet with other devices like laptops. You can tether devices over wireless LAN (Wi-Fi), Bluetooth, or by physical connection using a cable, e.g., USB.
What is airplane mode?
Airplane mode is a setting that suspends the device’s radio-frequency signal transmitting functions and disables telephone, Wi-Fi, and Bluetooth. This setting is available on many smart phones, portable computers, and other electronic devices.
What is a VPN?
A mobile VPN provides mobile devices with wired or wireless access to network resources and software applications on their home network.
What is Bluetooth?
Bluetooth is a wireless technology standard that connects multiple devices and avoids problems of synchronization. You can use it to exchange data over short distances from fixed and mobile devices, and for building personal area networks (PANs).
What is NFC?
Near Field Communication.
An NFC connection offers low-speed communication to bootstrap two electronic devices in near space of 4 cm or less. NFC can emulate keycards, electronic identity documents, or memory cards.
What are miniUSB and microUSB connections?
A mini-USB connector is a small USB cable connector that is often used by handheld electronic devices like mobile phones, MP3 players, and digital cameras.
– On mobile phones it is used for both USB data connectivity and charging.
– The new connector, called micro-USB, is smaller than the mini-USB connector and allows for even thinner device designs
What is the lightning connector?
Lightning is a proprietary computer bus and power connector created by Apple. It replaces the previous 30-pin dock connector. You use it to connect Apple mobile devices like iPhones, iPads and iPods to host computers, external monitors, cameras, USB battery chargers, and other peripherals.
What is an Infrared port?
An IR port is a port on a mobile device that enables devices to exchange data without using cables.
What is a metered connection?
A metered internet connection uses a wired or wireless adapter to limit the amount of data a computer can receive per day or month, depending on the plan.
What is throttling and what does it help with?
Slows down or stops a metered connection when you reach a certain data limit. Throttling helps prevent you from going over the limit and being charged for extra data usage.
What are cellular location services?
Cellular Location Services allow apps to track the device’s approximate position. They may use GPS, Wi-Fi, cellular, Bluetooth data, QR codes, or RFID technology. You have the option to allow or disallow apps from using location tracking.
What are things to keep in mind regarding cellular location services?
– Some apps with services such as ridesharing, directions, and delivery depend on this tracking to function.
– When you choose to disallow them from tracking you, their services might be very limited.
– You can personalize services to your needs by choosing which apps track your location and which don’t.
– You can also set the permission to allow tracking only while an app is open. Once you close it, the service can’t track the device.
– Some apps may track location for advertisement, entertainment, or security purposes.
What is GPS?
Global Positioning System.
GPS is a navigation system made of several satellites, a receiver, and algorithms to determine position and/or travel paths using location, velocity, and time data.
How does GPS work?
– The receiver measures the distance to each satellite by the amount of time it takes to receive a sent signal.
– After receiving the results from several satellites, it determines the position and displays it electronically.
– It can also determine the path taken since it started tracking and the path that should be taken depending on the desired destination.
What is Preferred Roaming List?
PRL is a database in Code Division Multiple Access (CDMA) wireless devices. The information is used during the system selection and acquisition process.
