Week6 - Intro 2 Wireless Com
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Transcript of Week6 - Intro 2 Wireless Com
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Week 6 Wired & Wireless
Communication
Presentation by Kwame Tweneboah-Koduah (SOT, GIMPA)
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Wired & Wireless Communication
Presentation by Kwame Tweneboah-Koduah (SOT, GIMPA)
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Objectives
Define bandwidth and discuss the bandwidthneeds of typical users.
Discuss how modems transform digital computersignals into analog signals.
List transmission media and explain severaltransmission methods.
Presentation by Kwame Tweneboah-Koduah (SOT, GIMPA)
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Objectives Provide examples of how digitization and
convergence are blurring the boundaries thatdistinguish popular communications devices,
including phones and computers.
Discuss variouswired and wireless applications.
Presentation by Kwame Tweneboah-Koduah (SOT, GIMPA)
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Moving Data:
Bandwidth and Modems Communications is the process of sending and
receiving messages electronically between twopoints.
Acommunications channel is a path used tosend and receive messages.
Presentation by Kwame Tweneboah-Koduah (SOT, GIMPA)
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Moving Data:
Bandwidth and ModemsAnalog signals are continuous waves.
Digital signals are discontinuous, discrete pulses.
Converters translate signals.
Presentation by Kwame Tweneboah-Koduah (SOT, GIMPA)
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Moving Data:
Bandwidth and Modems
Presentation by Kwame Tweneboah-Koduah (SOT, GIMPA)
Digital signal sampling
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Moving Data:
Bandwidth and Modems Bandwidth is the maximum amount of data
transmitted through a communication channel atone time.
Throughput is the actualamount of datatransmitted.
Broadband is any transmission medium thatcarries several channels to transport data at highspeeds.
Presentation by Kwame Tweneboah-Koduah (SOT, GIMPA)
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Moving Data:
Bandwidth and ModemsAmodem is a communication device used to send
and receive data between different transmissionsystems.
The sender uses modulation to transmit digitalsignals.
The receiver uses demodulation to return signals todigital form.
The term modem comes from modulate anddemodulate.
Presentation by Kwame Tweneboah-Koduah (SOT, GIMPA)
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Moving Data:
Bandwidth and Modems
Presentation by Kwame Tweneboah-Koduah (SOT, GIMPA)
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Moving Data:
Bandwidth and Modems Types of modems
Analog
Digital subscriber line (DSL)
Cable
Integrated Services Digital Network (ISDN)
The data transfer ratethe rate at which two
modems exchange datais measured in bits persecond (bps).
Presentation by Kwame Tweneboah-Koduah (SOT, GIMPA)
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Wired Transmission Media
Twisted pair wire is copper wire used fortelephone and data communication.
Two pairs of interweaved wires twisted together Inexpensive, but bandwidth too low for video, voice,
and data at the same time
Presentation by Kwame Tweneboah-Koduah (SOT, GIMPA)
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Wired Transmission Media
Presentation by Kwame Tweneboah-Koduah (SOT, GIMPA)
Coaxial cable consists ofcopper wire surrounded by
insulation and braidedwire.
Broadband communication
Cable TV
10 Mbps transfer rate
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Wired Transmission MediaFiber-optic cable consists of
thin strands of glass or plastic
that carry data through pulsesof light.
Broadband communication
10 Gbps transfer rate
Presentation by Kwame Tweneboah-Koduah (SOT, GIMPA)
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Wireless Transmission Media
Sending and receivingdevices must be in line ofsight.
Use an IrDA port toenable data transfer.
Presentation by Kwame Tweneboah-Koduah (SOT, GIMPA)
Infrared is a wireless transmission medium thatcarries data through the air using light beams.
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Wireless Transmission Media Radio transmission enables music, photos, and
voice to travel through the air as radio frequency orradio waves. Bluetooth radio transmission enables devices within
30 feet to communicate wirelessly. Does not require direct line of sight.
Presentation by Kwame Tweneboah-Koduah (SOT, GIMPA)
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Wireless Transmission Media
Presentation by Kwame Tweneboah-Koduah (SOT, GIMPA)
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Wireless Transmission Media Microwaves transmit data via electromagnetic radio
waves with short frequencies.
Presentation by Kwame Tweneboah-Koduah (SOT, GIMPA)
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Wireless Transmission Media Satellites are microwave relay stations in
space that transmit data through microwave
signals. Direct broadcast satellite (DBS) is a consumer
satellite technology that receives digital TVsignals through a reception dish.
Presentation by Kwame Tweneboah-Koduah (SOT, GIMPA)
d
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Wired Communication
via the PSTN
Public switched telephone network (PSTN) Worldwide telephone system used for data
and voice communications
Primarily digital
Subscriber loop carrier (SLC) Links home and business telephones
Accommodates analog devices Local loop is the area served by an SLC.
Presentation by Kwame Tweneboah-Koduah (SOT, GIMPA)
Wi d C i i
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Presentation by Kwame Tweneboah-Koduah (SOT, GIMPA)
Wired Communication
via the PSTN
Wi d C i i
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Digital telephony
Telephones and transmissions are digital.
Companies use a private branch exchange (PBX).
Multiplexing
Allows multiple calls over a single line.
Long-distance carriers transmit many calls in digitalformat in a single circuit.
Presentation by Kwame Tweneboah-Koduah (SOT, GIMPA)
Wired Communication
via the PSTN
Wi d C i ti
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Presentation by Kwame Tweneboah-Koduah (SOT, GIMPA)
Wired Communication
via the PSTN
Wi d C i ti
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Last-mile technologies
Cable-based broadband
Provides Internet access through cable TV connections
Uses cable modems to obtain higher speeds than DSL
Leased lines
Specially conditioned telephone lines, such as T1 lines,between two points
Presentation by Kwame Tweneboah-Koduah (SOT, GIMPA)
Wired Communication
via the PSTN
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Convergence:
Is It a Phone or a Computer?
Convergence is blending: Multiple industries such as
computers, consumer electronics, andtelecommunications
Products such as personal computersand telephones
Presentation by Kwame Tweneboah-Koduah (SOT, GIMPA)
Digitization is the process of transforming datainto a digital form.
C
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Cellular telephones
Digital transmission of voice, text, images, and video.
Classified by generations; 3G (third generation) is the
current generation. A network of transmitters called cell sites broadcasts
signals throughout geographic areas called cells.
Presentation by Kwame Tweneboah-Koduah (SOT, GIMPA)
Convergence:
Is It a Phone or a Computer?
Convergence
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Web-enabled devices
Display and respond to markup languages, such asHTML and XML, that are used to build Web pages.
Examples PDAs
Smartphones
Notebooks
Presentation by Kwame Tweneboah-Koduah (SOT, GIMPA)
Convergence:
Is It a Phone or a Computer?
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Wired and Wireless Applications Internet telephony, or VoIP (Voice over Internet
Protocol)
Offers computer-to-phone and phone-to-phone
transmission through the Internet Placing calls requires:
A computer with a microphone and speakers orheadphones
An Internet connection A telephone-enabled program
Presentation by Kwame Tweneboah-Koduah (SOT, GIMPA)
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Wired and Wireless Applications
Presentation by Kwame Tweneboah-Koduah (SOT, GIMPA)
Internet telephony
Videoconferencing transmits sound and video
images to people in different locations using: Video camera
Skype software
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Wired and Wireless Applications Satellite technology
Satellite radio
Is not affected by location, distance, or obstructions
Uses satellites orbiting the Earth Permits usage in areas with restricted local radio stations
or bad AM/FM reception
Presentation by Kwame Tweneboah-Koduah (SOT, GIMPA)
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Wired and Wireless ApplicationsSatellite technology
GPS (Global Positioning System)
A system of 27 satellites that allows a GPS receiverto pinpoint a location
Mobile units for cars
Installed car systems, such as OnStar
Presentation by Kwame Tweneboah-Koduah (SOT, GIMPA)
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Wired and Wireless Applications
Text messaging is using
a cell phone forapplications previouslyused on computers
Instant messaging
Brief e-mail
Presentation by Kwame Tweneboah-Koduah (SOT, GIMPA)
Text and picture messaging
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Wired and Wireless Applications
Picture messaging
Transmits color pictures and backgrounds Cellular telephone acts as a camera
Presentation by Kwame Tweneboah-Koduah (SOT, GIMPA)
Text and picture messaging
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Wired and Wireless Applications Surfing safely at public wireless hot spots
Use firewalls and antivirus software.
Use legitimate networks to avoid evil twins.
Do not perform financial transactions.
Select appropriate operating system settings to avoidbeing detected.
Presentation by Kwame Tweneboah-Koduah (SOT, GIMPA)