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					Telecommunication &

    Rashedul Hasan
                 What is it?

   Telecommunication is the transmission
    of signals over a distance for the purpose
    of communication.
   telecommunication typically involves the
    use of electronic transmitters such as the
    telephone, television, radio or computer.
Copy of Alexander Graham Bell’s
       original telephone
               Different usages

   In cities throughout the world, home owners use
    their telephones to organize many home
    services ranging from pizza deliveries to
   In Bangladesh's Narshingdi district, isolated
    villagers use cell phones to speak directly to
    wholesalers and arrange a better price for their
   In Cote d'Ivoire, coffee growers share mobile
    phones to follow hourly variations in coffee
    prices and sell at the best price.

   Video conferencing & Video phone
   Conference call
   Telecommuting & virtual office.
   A videoconference is a set of interactive
    telecommunication technologies which allow two
    or more locations to interact via two-way video
    and audio transmissions simultaneously. It has
    also been called visual collaboration.

   It differs from Video Phone in that it is
    designed to serve a conference rather than
            Video conferencing
   Is the use of television video and sound
    technology as well as computers to enable
    people in different location to see, hear and talk
    with one another.
   For a video conference, equipments can be set
    up on people’s desk, with a camera and
    microphone to capture the person speaking and
    monitors and speakers for the person being
    spoken to.
  Dual plasma display videoconferencing system. The
  screen on the left is primarily used to show people
   during the conference or the user interface when
setting up the call. The one on the right shows data in
this case but can display a 2nd 'far site' in a multipoint
Video Phone
    President George W. Bush
conducting a video conference at a
          Air Force Base
    Components required for a VTC
          system include:

   Video input : video camera or web cam
   Video output: computer monitor , television or
   Audio input: microphones
   Audio output: usually loudspeakers associated
    with the display device or telephone
   Data transfer: analog or digital telephone
    network, LAN or Internet
    There are basically two kinds of
            VTC systems:
   Dedicated systems have all required
    components packaged into a single piece of
    equipment, usually a console with a high quality
    remote controlled video camera.
   Desktop systems are add-ons to normal PCs,
    transforming them into VTC devices. A range of
    different cameras like web cam and
    microphones can be used with the board, which
    contains the necessary codec and transmission
     Useful in Business when…..
   a live conversation is needed;
   meetings on short notice.
   visual information is an important component of
    the conversation;
   the parties of the conversation can't physically
    come to the same location; or
   Time and money that used to be spent in
    traveling can be used to have short meetings.
       Advantages for business

   Video Conferencing Increases
   Improves Communication
   Video Conferencing Saves Time
   Video Conferencing Saves Money
   Improves Effectiveness
    Video Conferencing Increases
   The ability to be in several places at
    once without leaving your office is
    the prime advantage of video
    conferencing. Managers will be able
    to keep in closer contact with
    customers. This closeness will lead to
    new ideas on how to speed up the
    development of new products and
       Improves Communication
   During a videoconference you can see the facial
    expressions and body language of conference
    participants. These are both important aspects
    of communication that are lost with a basic
    telephone call.
   From the customer’s perspective, the only
    person ever seen is the salesperson from your
    company. Wouldn’t it improve your business
    relationship with your best customers if they got
    to meet more of your internal employees?
Video Conferencing Saves Time

   Videoconferencing lets you put together a
    meeting of various people, from different
    locations, for a common discussion. Participants
    can be across the country or on the other side of
    the globe. For example, you can have sites in
    London, New York and Tokyo, all with multiple
    personnel, participate in the same
    videoconference. Otherwise you have to go
    physically the above mentioned three cities.
      Video Conferencing Saves

   There are, however, numerous situations
    where you can save a lot of money on
    airfare and hotel costs, not to mention
    saving the loss in productivity from being
    out of the office.
      Improves Effectiveness
   We all know that "a picture is worth a thousand
   A live video call is much more effective than a
    phone call in many situations. For example, your
    engineering staff needs to show one of your
    vendors a problem with a purchased component.
    Visually seeing the part during a
    videoconference is far more effective and
    meaningful than trying to describe it over the
          Impact on education
   faculty member keeps in touch with class while away
    for a week at a conference
   guest lecturer brought into a class from another
   researcher collaborates with colleagues at other
    institutions on a regular basis without loss of time
    due to travel
   faculty member participates in a thesis defense at
    another institution
   faculty committee auditions a scholarship candidate
   student interviews with an employer in another city
   Connects educational facilities worldwide for distance
    learning and employee training
    Impact on medicine and health
   Videoconferencing is a very useful technology for
    telemedicine and telenursing applications, such
    as diagnosis, consulting, transmission of medical
    images, etc. Using VTC, patients may contact
    nurses and physicians in emergency or routine
    situations, physicians and other paramedical
    professionals can discuss cases across large
    distances. Rural areas can use this technology for
    diagnostic purposes, thus saving lives and making
    more efficient use of health care money.
   Special peripherals such as microscopes fitted
    with digital cameras, video endoscopes, medical
    ultrasound imaging devices etc., can be used in
    conjunction with VTC equipment to transmit data
    about a patient.
   Appearance Consciousness: The problem
    with videoconferencing is that one is on camera,
    with the video stream possibly even being
    recorded. The burden of presenting an
    acceptable on-screen appearance is not present
    in audio-only communication.
   Research found that the addition of video
    camera actually impaired communication,
    possibly because of the consciousness of being
    on camera.
   Quality of service: In some countries it is difficult
    or expensive to get a high quality connection
    that is fast enough for good-quality video
   Technologies such as ADSL have limited upload
    speeds and cannot upload and download
    simultaneously at full speed.
   As Internet speeds increase higher quality and
    high definition video conferencing will become
    more readily available.

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