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