COMMUNICATION AND NETWORKS
Computer Communications
✔ describes a process in which
two or more computer or
devices transfer data,
instructions, and information
For successful communication, the
following must be present:
✔ sending device – initiates
an instruction to transmit
data, information, or
instructions
✔ communication device –
connects sending device to a
communication channel
✔ communication channel –
transmission media; which
data, instructions, or
information travel
✔ communication device –
connects communications
channel to receiving channel
✔ receiving channel –
accepts the transmission of
data, instruction, or
information
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USES OF COMPUTER
COMMUNICATION
Blogs
Chat Rooms
E-Mail
Fax
FTP
Instant Messaging
Internet
Newsgroups
RSS
Video Conferencing
VoIP
Web
Web 2.0
Web Folders
Wikis
MEANS OF COMMUNICATION
Wireless Messaging Services
✔ users can send and receive
wireless messages to and from
mobiles devices and computers
using three techniques: (1) text
messaging – SMS (short
message service); allows users
to send/receive short text
messages typically fewer than
300 characters on mobile
devices and computers; typically
provide users with several
options for sending and
receiving messages
(2) picture/video messaging –
MMS (multimedia message
service); users can send pictures
and sound files, as well as short
messages, to mobile device or
computer; can send short video
clips about 30 seconds long
(3) wireless instant messaging –
IM (Instant Messaging); real-time
internet communications service
that allows wireless mobile devices
to exchange messages with one or
more mobile devices or online
users;
Wireless Internet Access Points
✔ people connect wirelessly to the
internet through wireless
internet access points
✔ users access wireless internet
access points with computers or
devices that have the necessary
built-in wireless capability
✔ Two Types
1. Hot Spots
▪ wireless network that provides
Internet connections to mobile
computers and devices mobile
wireless networks
▪ 3 Hotspots Technologies: Wi-Fi –
provide wireless network
connections to users in public
locations; WiMAX – has a wider
range than Wi-Fi; Bluetooth
hotspots – location-based
services
documents, users can access
these documents, can track all
changes made to a document
✔ Web Conferencing – online
meeting where all participants
see a document(s) at the same
time
Global Positioning System (GPS)
✔ a navigation system that consists
of one or more earth-based
receivers that accept and analyze
signals sent by satellites in order
to determine the receiver’s
geographic location
✔ GPS receiver – handheld,
mountable, or embedded device
that contains an antenna, a radio
receiver, and a processor
Groupware
✔ a software that helps groups of
people work together on projects
and share information over a
network
✔ a component of a broad concept
called workgroup computing
which includes network hardware
and software that enables group
members to communicate,
manage projects, schedule
meetings, and make group
decisions
✔ most groupware provides
personal information manager
(PIM) functions to assist with
activities
✔ group scheduling – a major
feature of groupware which a
group calendar can track the
schedules of multiple users and
help coordinate appointments
and meeting times
Collaboration
✔ many software products provide a
mean to collaborate, or work
online, with other users
connected to a server
✔ Two Methods of Collaboration:
(1) collaborative software –
includes tools that enable users
to share documents via online
meetings and communicate with
other connected users; (2)
document management system –
provides for storage and
management of a company’s
Voice Mail
✔ functions much like an answering
machine
✔ allows someone to leave a voice
message for one or more people
✔ converts an analog voice
message into digital form
✔ message is stored in a voice
mailbox one digitized
✔ voice mailbox – a storage on a
hard disk in the voice mail system
✔ Basic Elements of Good
Voicemail Greetings
o Greeting
Cybercafés
✔ Internet café
✔ coffeehouse, restaurant, or other
location that provides personal
computers with internet access to
its customers
✔ exists in cities around the world
✔ most charge a per-hour or perminute fee
o Your name
o Statement that you cannot take
their call right now
o Invitation to leave a message
o Who they can contact for
immediate assistance
o Should be no longer than 20-25
seconds
Web Services
✔ describe standardized software
that enables programmers to
create applications that
communicate with other remote
computers over the internet or
over an internal business network
✔ primary users are businesses
because this technology provides
a means for departments to
communicate with each other,
suppliers, vendors, and with
clients