Transcript Digital Communications

Overview of Digital
Communications
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Digital Communications
Digital communications include all
forms of modern electronic
communications.
Personal communications involve
communications that take place outside
of industry – this is our focus.
Demo: http://secondlife.com/
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Personal Communications
Old Skool
 Face-to-face
 In person
 Voice
 Home phone
 Business phone
 Public booths
 Text
 Snail mail
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New Skool - Digital
 Face-to-face
 Video Phone/Email/Chat
 Voice
 Cell Phone
 Voice Mail
 Internet Phone/Chat
 Text
 Email
 Instant Messaging (IM)
 SMS Texting
Types of Communication
 Synchronous Communication takes place in
real time.
Phone conversation
Instant Messaging
 Asynchronous Communication allows
participants to leave messages to be
accessed whenever.
Voice mail
Email
SMS Texting
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3. Phone (voice)
4. Instant messaging/Chat
5. Voice mail
6. Email
7. SMS Texting
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Convenience
Asynchronous
1. Face-to-face
2. Video conferencing
Effectiveness
Synchronous
Effectiveness vs. Convenience
Emerging Communications
Technologies
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Voice over IP (VoIP)
Technology that
enables network
managers to route
phone calls over the
same network they
use for data.
Future of Phones: http://newsroom.cisco.com/dlls/video_audio_archive/?all
Also see Video Telephony
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Residential VoIP
• Residential VoIP, Broadband Phone
• Phone service over a broadband Internet
connection.
http://www.voipchoices.com/vonage.html
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Video Conferencing
Video conferencing is a technology
that combines video and voice
communications along with document
sharing.
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Cell Phone Technology
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Cellular Network
 A cellular network is a radio network in
which a geographic area is divided into
cells, with a transmission tower and
station at the center of each cell, to
support mobile communications.
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Generations
1st Gen – analog wireless signal
2nd Gen – digital wireless signal
3rd Gen (3G) – broadband digital
network that supports both voice and
data services such as video
Current 3G services are barely broadband
3.5G with 3 Mbps data rates is under way
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Generations
4th Gen
 The Wireless World Research Forum (WWRF) defines 4G as a
network that operates on Internet technology, combines it with
other applications and technologies such as Wi-Fi and WiMAX,
and runs at speeds ranging from 100 Mbps (in cell-phone
networks) to 1 Gbps (in local Wi-Fi networks). 4G is not just one
defined technology or standard, but rather a collection of
technologies and protocols to enable the highest throughput,
lowest cost wireless network possible. [wikipedia]
 Anywhere, anytime computing.
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Carriers
 A cellular carrier is a company that
builds and maintains a cellular
network and provides cell phone
service to the public.
See how they rate: www.consumerreports.org
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GSM and CDMA
GSM
CDMA
Cingular
AT&T
T-Mobile
Verizon
Sprint
Nextel
 Digital networking standards for
cell phone networks are GSM
and CDMA.
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GSM: Global System
for Mobile
Communications
CDMA: Code division
multiple access
GSM and CDMA
GSM
CDMA
Cingular
AT&T
T-Mobile
Verizon
Sprint
Nextel
GSM
CDMA (IS-95)
 Covered in virtually all parts of the
world
 Mature, more stable network with
robust features
 Less signal deterioration inside
buildings
 Talktime is generally higher
 Subscriber Identity Modules (SIM)
allows users to switch networks
and handsets at will
 interferes with some electronics,
especially certain audio amplifiers
 It can accommodate more users
 uses soft handoff, reducing the
likelihood of dropped calls
 has a well-defined path to higher
data rates
 are generally unable to roam
internationally
 Smaller market so features are
sometimes late in coming to
CDMA devices
 every time you subscribe with a
new provider you must buy a new
phone
http://en.wikipedia.org/wiki/Comparison_of_mobile_phone_standards
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GSM and CDMA
GSM
CDMA
Cingular
AT&T
T-Mobile
Verizon
Sprint
Nextel
 GSM Phones include a subscriber
identity module (SIM) for security and
convenient data transfer between
phones.
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Choosing a Cell Phone
Service
 Consumers choose a carrier based on
coverage area, handsets available, and
services provided.
 There are typically two service options:
 A pay-as-you-go plan is a prepay system in
which you buy minutes up front that must be
used in a given time frame
 Service contracts are typically for two years
and involve finding a plan that best matches
your usage
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Choosing a Cell Phone
Service
Calling plan option variables:
 Whenever, or anytime, minutes with no time restrictions
 Weeknight minutes, typically Monday through Friday, 9:00
p.m. to 5:59 a.m. or 6:59 a.m.
 Weekend minutes, typically Saturday 12:00 a.m. to Sunday
11:59 p.m.
 Rollover minutes are leftover unused minutes passed on
from one month to the next
 Mobile-to-mobile, or in-network calls refers to phoning other
users of the same carrier.
 Roaming refers to making calls outside the carriers
coverage area using another carriers network
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Choosing a Cell Phone
Service
Fees:
 Using “additional minutes” beyond your service plan
agreement can cost big $ in fees
 Roaming can cost big $ in fees
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Cell Phone Technologies
 Learn about Service Plans,
Handsets, Features, and Services
by clicking the logos below.
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Cell Phone Features
http://www.phonescoop.com/phones/fin
der.php
Phone Finder
In Depth
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Cell Phone Technologies
 Cell phone accessories provide added
features for example…
 A 2 GB mini SD memory card can provide ample storage
digital photos, music, and video files.
 A Bluetooth headset allows you to interact with your
phone without taking it out of your pocket.
 Car chargers allow you to
charge your cell phone from
your car power supply.
 Assorted cases protect cell
phones from damage and
make them handy to access.
Bluetooth Ear bud reviews: http://review.zdnet.com/4566-12523_16-0.html?sort=edRating16+desc
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Wireless Technologies
 Bluetooth is wireless technology
that enables a wide variety of
digital devices to communicate
directly.
• 33 ft range
• 1 Mbps
• www.bluetooth.com
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Bluetooth
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