ch.8 Flashcards

Question

radio transmission

Answer 1

1- enable voice, photo and music travel through air as radio frequency or radio waves 2- do not require direct line or sight

Answer 2

radio transmission enable within 30 feet device communicate wirelessly

Answer 3

microwave station in space transmit data through microwave signals

Answer 4

consumer satellite technology that receives digital TV signals through a reception dish

Answer 5

Requires the computer system to have a special communications device to sends and receives data between computer that contain wireless adapters

Answer 6

- Global telephone system, a massive network used for data as well as voice communications - Comprising various transmission media ranging from twisted-pair wire to fiber-optic cable

Answer 7

1- Small, waist-high curbside installation that connects as many subscribers 2- Links home and business telephones 3- Accommodates analog devices

Answer 8

1- Is the area served by an SLC 2- SLC, the digital signals are routed via high-capacity fiber-optic cables to the local exchange switch 3- digital device capable of handling thousands of calls located in the local telephone company's central office (CO)

Answer 9

1- Telephones and transmissions are digital. 2- companies and universities install their own internal digital telephone systems, called private branch exchanges(PBXs).

Answer 10

1- Allows multiple calls over a single line. 2- Long-distance carriers transmit many calls in digital format in a single circuit.

Answer 11

1- Provide solutions for bottlenecks that result from the inability of users to access the PSTN’s high-speed fiber-optic cables 2- Used while local loops are upgraded

Answer 12

Technologies that help bridge that gap, last-mile technologies, include digital telephone standards (such as ISDN and DSL) that use twisted-pair wiring, as well as high-speed wired services (such as coaxial cable and cable modems).

Answer 13

1- Standard that provides digital telephone and data service 2- No lengthy dial-in procedures or connection delay 3- Requires an ISDN adapter/digital modem to connect computers to ISDN lines 4- May be the only broadband solution in rural areas

Answer 14

1- Broad term for a group of technologies that offer high-speed access to the Internet 2- Requires a DSL modem to modulate and demodulate analog and digital signals 3- More expensive than dial-up but cheaper than other broadband options

Answer 15

1- Provides Internet access through cable TV connections 2- Uses cable modems to obtain higher speeds than DSL

Answer 16

1- Sometimes called a dedicated line, is a connection set up by a telecommunication carrier and is usually a permanent fiber-optic or telephone connection 2- Enables continuous, end-to-end communication between two points 3- Larger organizations, such as ISPs, corporations, and universities, connect using leased T1 lines, which are fiber-optic

Answer 17

1- Fiber-optic T2 and T3 lines can handle up to 44.7 Mbps of computer data 2- SONET (synchronous optical network): is a physical layer of network technology that uses 1- fiber-optic cable and is designed to carry large volumes of data over long distances 3- MMDS (Multichannel multipoint distribution service): sometimes called multi point microwave distribution system) is microwave technology that was originally slated as a wireless alternative to cable television, but now its main application is Internet access 4- WiMax (Worldwide interoperability for microwave access): is a wireless up-and-coming digital communication system designed to deliver high-speed access over long distances

Answer 18

Process of transforming data into a digital form

Answer 19

1- Blending 2- Multiple industries Examples: Computers, consumer electronics, telecommunications 3- Products Examples: Personal computers, telephones

Answer 20

1- Digital transmission of voice, text, images, and video 2- Classified by generations—4G (fourth generation)—the current generation 3- Cell sites—network of transmitters broadcasts signals throughout geographic areas called cells

Answer 21

include in each cellular network that control communication within a set of cells.

Answer 22

1- Group of digital cellular technologies replacing most analog cellular services 2- 2G (second generation)—used to make smartphones, with features of phones and computing devices 3- 3G—more data and voice customers and higher data transfer rates 4- 4G—improved connectivity, data transfer rates, and support for the next generation of multimedia

Answer 23

1- Display and respond to markup languages Examples: HTML, XML—used to build Web,pages, PDAs ,Smartphones—replacing PDAs,Notebooks

Answer 24

1- Standard—specifies how users can access the Web securely using: Pagers Smartphones PDAs Other wireless devices 2- Requires a microbrowser

Answer 25

1- Offers computer-to-phone and phone-to-phone transmission through the Internet 2- Placing calls requires: Computer with a microphone, speakers or headphones Internet connection Telephony-enabled program

Answer 26

1- Videoconferencing (Web conferencing)—transmits sound and video images using: Video camera (Webcams) Skype software 2- Whiteboards—enable participants to create a shared workspace 3- Webcams—inexpensive, low-resolution analog or digital video cameras 4- Internet TV—ability to view television shows, videos, and movies over the Internet

Answer 27

1- Transmits documents over a telephone line or the Internet using either: Standalone fax machine Computer with a fax modem and a scanner

Answer 28

1- Satellite radio: Not affected by location, distance, or obstructions Uses satellites orbiting the Earth Permits usage in areas with restricted local radio stations or poor AM/FM reception 2- GPS (Global Positioning System) : System of 27 satellites allowing a receiver to pinpoint locations Mobile units for cars Installed car systems

Answer 29

1- Using cell phone for applications previously used on computers 2- Instant messaging 3- Brief e-mail

Answer 30

1- MMS (multimedia messaging system) 2- Transmits color pictures and backgrounds 3- Cellular telephone acts as a camera

Answer 31

1- Also known as position awareness 2- Uses GPS-enabled chips to pinpoint the location of a cell phone 3- Popular with parents of teenagers