Post on 29-Mar-2015
Evolution of Communication
John LieuKevin Torio
Tuyet NguyenWilliam Sullivan
What is Telecommunications?
Most people think…
It is…
Telecommunications is defined as ‘the assisted transmission of signals over distance for the purpose of communication.’
Trends
Concept established in 1961 through MIT’s Compatible Time-Sharing System (CTSS).
E-mail was the most popular application for the ARPANET computer network when it was established in 1969.
In 1971, Roy Tomlinson developed the use of the at symbol (@) to separate the names of their user and their machine.
E-mail Typical format of an e-mail
includes the header and the body.
Cc: (carbon copy) Bcc: (blind carbon copy) Received: (time
receiver receives)
Reply-To: (who receiver should reply to)
HTML-BASED ------->
E-mail(Plain Text)
QuickTime™ and a decompressor
are needed to see this picture.
Instead of “snail-mail,” e-mail sends the messages and attachments instantly (in real time).
It is the cheapest communication alternative overall.
It becomes more personal; more is involved in an e-mail than F2F or telephone communication.
Why E-mail?
Definition: The real-time exchange of information between people who are not in the same physical space
First introduced in the 1960’s with American Telephone and Telegraph's Picturephone
In 2004- $2.25 billion in revenue
Through teleconferencing, companies can conduct meetings, customer briefs, training, demonstrations and workshops by phone or online instead of in person.
What is Teleconferencing?
The Benefits of Teleconferencing Reduces the cost
of Face-To-Face meetings (travel costs)
People Follow-ups Shorter Meetings Better prepared
Technical failures
Impersonal
Lack of participation
Difficulty Identifying participant
Informal
Disadvantages
Three things to consider◦ Compatibility: “plug and play”◦ Sound Quality: Full duplex technology◦ Office Setting: Test office area
Options: Expansion capabilities, remote control or wireless microphones
Price: ranges anywhere from $400 - $2000
Before Purchasing
Video Conferencing
a set of interactive telecommunication technologies which allow two or more locations to interact via two-way video and audio transmissions simultaneously.
Also known as video teleconference or visual collaboration . Is a type of groupware.
Point-to-Point: conference between two people Multi-Point: conference that involve several
sites with more than one person at each site.
Video Conferencing
1964 – the earliest form of video conferencing. AT&T introduced the Picturephone at the World’s Fair in New York.
1971: Ericsson demonstrates the first trans-atlantic video telephone (LME) call.
1992: AT&T's $1,500 videophone for home market 1992: CU-SeeMe developed for the Macintosh system.
Although the first version didn’t have audio, it was the best video system developed to that point.
1996: The International Telecommunications Union (ITU) began developing standards for video conferencing coding
2001: the world’s first transatlantic tele-surgery took place utilizing video conferencing. In this instance, video conferencing was instrumental in allowing a surgeon in the U.S. to use a robot overseas to perform gall bladder surgery on a patient.
History
2003: rise in use of video conferencing for off-campus classrooms
2004: Applied Global Technologies developed a voice-activated camera for use in video conferencing that tracks the voice of various speakers in order to focus on whoever is speaking during a conference call.
2004: WiredRed Software became the first company to enable 10 or more participants to conduct video conference sessions simultaneously.
2005: WiredRed made another first by offering web, VoIP and video conferencing over secure connections that can utilize third-party, or on-premise PKI systems.
History (cont.)
Core technology of a VTC system is digital compression of audio and visual streams in real time.
Codec: the hardware or software that performs compression ( can achieve rates of compression u p to 1:500)
digital stream of 1's and 0's are subdivided into labeled packets, which are then transmitted through a digital network of some kind (usually ISDN or IP).
Videoteleconference System
Two types of VTC systems:1) dedicated systems: have all required components packaged into a single piece of equipment. 2) desktop systems: are add-ons to normal PC's, transforming them into VTC devices.
International Telecommunications Union (ITU) - has three umbrellas of standards for VTC:
a) H.320 - the standard for VTC over integrated services digital networks (ISDN)
b) H.323 - the standard for transporting multimedia applications over LANs and IPs
c) H.324 - the standard for transmission over POTS, or audio telephony networks.
Systems & Standards
Video input : video camera or webcam Video output: computer monitor, television
or projector Audio input: microphones Audio output: loudspeakers or a headset Data transfer: analog or digital telephone
network, (LAN or Internet)
Components of a VTC system
Business: enables individuals in faraway places to have meetings on short notice, saves money on traveling expenses.
Education: teachers from all over the world can be brought to classes in remote or otherwise isolated places. Students from diverse communities and backgrounds can come together to learn about one another. Students are able to explore, communicate, analyze and share information and ideas with one another.
Medicine: patients may contact physicians and nurses in emergency or routine situations. Physicians and other paramedical professionals can discuss cases across large distances
Benefits of Video Conferencing
Eye ContactEye Contact plays a large role in conversational turn taking, perceived attention & intent and other aspects of group communication. Videoconferencing systems can sometimes provide an incorrect perception that the remote interlocutor is avoiding eye contact.
Appearance ConsciousnessCommunication impairment can result from people being self conscious about appearing on camera. People might also worry about saying or doing something embarrassing since the video streams can be recorded.
Watch Video
Issues