Distance Learning and Videoconferencing
Satellite communication has many unique features
such as a wide bandwidth, large transfer capacity, multi-service
support, vast covering area, high reliability, flexibility,
less environment constrains, and less investment caused
by communication distance. At the present time, it is
a major way for distance learning and videoconferencing.
Via IPCast system, distance learning/videoconferencing
system, using Multicast, can perform rich multimedia and
interactive functions. This software employs UDP other
than TCP to effectively avoid time-delay caused by satellite
transmission. The Multicast is point to multi-point broadcasting,
allowing receive-only end users at remote sites; as for
those who request to send information back, Unicast is
used on the return channels.
It is well-known that IP technology-based distance learning
breaks through the geographical and time limits with the
traditional education system, makes it easy for people
to acquire knowledge, and becomes a necessary way to distribute
education and knowledge. Distance learning system provides
learners various teaching materials in various forms including
video, image, voice, and text, etc..
Main features of distance learning via IPCast system:
 Control
and management of the teaching lessons
Real-time
audio/video lessons transfer
Various
course programs transfer
Remote
classrooms' authorization and management
Interactive
image, voice and text communication with remote classrooms
Control
to distribute information stored in the multimedia servers
group
Independent
forward and return channel, allowing to select return
channel
flexibily on customer's demand
Supporting
file distribution of various format, providing fescues
and white boards
function
Receiving
real-time and non-real-time programs
Receiving
multimedia stream files, courseware
In today's global marketplace, customers, suppliers, employees
and business partners typically are scattered through
the world. But while vital people and functions grow more
distant geographically, today's business environment demands
that they work together more closely and quickly than
ever before. Fortunately, satellite videoconferencing
system solution can help businesses bridge the distances
and shorten project cycles easily and affordably.
DAMA-600 and MIDAS system, offered by Wancom, can perform
videoconferencing. These systems are capable of providing
a perfect videoconferencing with only one pair of satellite
carriers.
The DAMA-600 Videoconferencing System uses Async channel
available in EFData Modems to transmit videoconferencing
control commands to implement star videoconferencing system.
This system can:
Allow
the chairman to arrange the schedule of a conference
Allow
the chairman to preside meeting and select speakers
Allow
the chairman to make interactive conversations with any
participants
Provide
the chairman with tools such as meeting records display
and output
Provide
the status of occupancy of the satellite bandwidth for
the operator
Provide
the status of satellite communication equipment for the
operator
Provide
operation help
Switch
the menu between Chinese and English version
MIDAS Videoconferencing System's main features are:
In the MIDAS system, by using independent control channels
and VCCS(Video Conference Control System ) at each meeting
site, each meeting site is able to become the chairman
and control the whole course of a conference. Meanwhile,
each site can request to speak and give a speech to
all sites under the permission of the chairman. It also
allows any site to communicate with the broadcaster.
This Videoconferencing System has a friendly control
interface and is convenient for management.
The chairman in the MIDAS Videoconferencing System can
initiate the conference, select participants, add/remove
participants, view the status of all the participants,
accept or reject participant request for broadcaster
or talk back to the broadcaster, change broadcaster
or return channel transmitter and terminate the conference.
Participant in a MIDAS Videoconferencing System can
accept or reject the invitation to join the conference,
request to broadcast or talk to the broadcaster, leave
the conference.
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