LIS 505 - 7. Networking
Running a program on more than one computer or CPU
or storing parts of a database on more than one computer.
Transmission using discrete values,
such as bits.
Modern computers generally transmit data digitally.
Transmission using continuous values.
Transmission over the conventional telephone system
is considered analog.
Communication in which data can be transmitted intermittently
rather than in a steady stream.
Typical of communication between computers and other devices.
Also called start-stop transmission.
Transmission at regular intervals.
Typical of communication along the bus within a computer,
which is governed by a clock.
Transmission in only one direction.
Transmission in only one direction at a time.
Transmission in both directions at once.
Blending of data into a carrier signal.
The reverse process,
separating of data from a carrier signal,
is called demodulation.
Modems that reside in self-contained boxes outside their computers.
Modems that reside on printed circuit boards
inside their computers.
Modems designed to work over cable television lines.
Devices that can be attached to personal computers
that enable them to transmit and receive electronic documents as faxes.
Often combined with regular modems.
Short for Integrated Services Digital Network.
A standard for sending voice, video, and data
for short distances over telephone lines.
Short for digital subscriber lines.
A class of technologies for sending data over regular telephone lines
for short distances.
Faster than ISDN.
Short for unshielded twisted pair.
Cable consisting of two unshielded wires
twisted around each other.
Commonly used for telephones
and in many local area networks.
Also called twisted pair or wire pair,
though twisted pair can also be shielded,
giving higher bandwidth.
Cable consisting of a center wire surrounded by insulation
and then a shield of braided wire.
Cable consisting of bundles of glass threads,
each of which can carry data modulated onto light waves.
A form of electromagnetic waves
little affected by the atmosphere,
commonly used for wireless transmission.
Wireless receivers/transmitters placed in orbit.
Users in remote locations
may access the Internet by communicating with a satellite
with an antenna (Internet over satellite or IoS).
The amount of data that can be transmitted in a fixed amount of time.
Typically expressed in bits per second or bytes per second.
Interference that destroys the integrity of signals.
Shape of a communication system.
Topology in which all devices are connected to a central computer.
Topology in which all the devices are connected in a closed loop.
Topology in which all devices are connected to a single cable.
Short for wide area networks.
Computer networks that span relatively wide geographical areas.
A WAN typically consists of several
NICs for short.
Printed circuit boards that allow computers to communicate
over a network.
Connecting to a network by modem and telephone lines,
via a dial-up service or switched service.
Channels reserved exclusively for one kind of communication.
Permanent connections between points
set up by a telecommunications common carrier.
Devices that combine several signals for transmission.
Also spelled multiplexers.
Devices that connect LANs
without analyzing and rerouting messages.
Devices that connect a number of LANs,
routing packets of information to appropriate locations.
Points on a network that serve to connect to other networks.
In contrast to hosts,
which are end points.
Copying data from a central computer, server, etc.,
to a local computer,
or from a computer to a peripheral device.
Copying data to a central computer, server, etc.,
from a local computer,
A way of arranging a network
in which every computer or process running on a computer
is either a client or a server,
with the clients asking the servers for information
or to perform other actions such as printing.
A communications model in which each party has the same capabilities and
either party can initiate a communication session.
Short for Carrier Sense Multiple Access / Collision Detection.
A set of rules for how points on a network should respond
when two of them attempt to use a data channel simultaneously
After detecting a collision, a device waits a random time
and then attempts to re-transmit its message.
If it detects a collision again,
it waits twice as long again.
A widely-used LAN structure,
originally developed by Xerox
and using a bus topology with CSMA/CD.
A type of network with a ring topology
in which a special bit pattern (called a token)
travels around the ring.
To send a message, a device attaches a message to the token.
Holding a conference via telephone or network connections.
Holding a conference by using a computer network
to transmit audio and video data.
Short for electronic data interchange.
Transfer of data between companies, etc., using networks.
EFT for short.
Transfer of funds electronically from one bank account to another,
initiated from any of various kinds of electronic device.
System in which office workers work using computers at home
sending and receiving data over telephone lines.
Last updated October 23, 2002.
This page maintained by
Prof. Tim Craven
E-mail (text/plain only): firstname.lastname@example.org
Faculty of Information and Media Studies
University of Western
Canada, N6A 5B7