Chapter 7 Telecommunications

packet switching

method of slicing digital messages into parcels called packets, sending the packets along different communications paths as the become available and then reassembling the packets once they arrive at their destinations.

modem

modulators-demodulators connect your home network to the internet using a cable network

software defined networking

new networking approach in which many networking control functions are managed by one central program, which can run on inexpensive commodity server that are separate from the network devices.

analog signal

represented by continuous waveform that passes though a communications medium and has been used for voice commuication

Network Operating System (NOS)

routes and manages communications on the network and coordinates network resources

protocol

set of rules and procedures governing transmission of information between two points in a network

Hubs

simple devices that connect network components, by sending packet to other devices

Wide Area Network (WAN)

span broad geographical distances

Metropolitan area network

spans a metropolitan area, usually a city and its major suburbs.

Hertz

the number of cycles per second that can be sent through that medium

Search Engine Optimization

the process of improving the quality and volume of web traffic to a website by employing a series of technologies keywords and phrases

Bandwidth

the range of frequencies that can be accommodated on a particular telecommunications channel

web 2.0

websites that enable people to create and share content like flikr and facebook

TCP/IP MODEL

APPLICATION TRANSPORT INTERNET NETWORK INTERFACE

WiMAX

Worldwide Interoperability MIcrowave Access is a wifi like signal that has a range of 30 miles

Client/Server Computing

distributed computing model inwhich some of the processing power is located within small, inexpensive client computers.

digital signal

a discrete binary waveform that that communicate infomation as strings of two states, on and off.

Virtual Private Network

a secure encrypted private network that has been configured within a public network to take advantage of economies of scale and encrypt traffic on public wifi

Internet2

an advanced networking consortium representing over 350 US universities, private businesses, and government agencies working to connect communities with high capacity internet

Wireless sensor networks

are networks of interconnected devices that are embedded into the physical environment to provide measurements of many points over large spaces.

router

communications processor used to route packets of data though different networks,ensuring the data sent gets to the correct address

DNS

converts domain names to ip addresses

switch

has more intelligence than a hub and can filter and forward datato all other connected devices

unifed communications

integrates disparate channels for voice communications, data communications, instant messaging, email and conferencing into a single experience

instant messaging

is a type of chat service that enables participants to create their

local area network LAN

is designed to connect personal computers and other digital devices within a half mileor 500 meter radius.

personal area networks

links up to eight devices within a 10 meter area