Hi! Thanks for the question.
Here are the basics about internet access through VSAT.
1. What is VSAT?
"VSAT stands for “Very Small Aperture Terminal” and refers to
receive/transmit terminals installed at dispersed sites connecting to
a central hub via satellite using small diameter antenna dishes (0.6
to 3.8 meter). "
"VSAT Technology Explained"
http://www.qpcomm.com/vsat_info.html
Antenna Types:
3.8 meter Dish - "The Vertex 3.8 meter is a multi-band capable antenna
that is IntelSat approved with world wide recognition. The 3.8 meter
antenna is a perfect antenna for a VSAT hub or as a remote with large
capacity needs."
3.5 meter Comtech Antenna - "The Comtech 3.5 meter antenna is another
antenna utilized as a hub or remote site providing a reliable low cost
solution for services."
2.4 Comtech Fly-Away antenna - "The Comtech 2.4 meter antenna is a
triband capable antenna that is truly a Fly-Away system. It is
specially engineered to allow for transportation on commercial
airlines to be checked in as standard baggage."
The Prodelin transportable (Usually used during catastrophic events)
-"...another quick deployment antenna that can be shipped anywhere in
the world and assembled in a quick manner in the field with no special
tools required."
"VSAT TECHNOLOGY"
http://www.mainsat.com/vsat.html
2. How do you access the internet through VSAT?
"A VSAT network has three components, namely, the hub (Earth Station),
the satellite (space segment), and the remote. The remote likewise has
two components: the outdoor unit (ODU) consisting of the antenna,
amplifier, and cabling; and, the in-door unit (IDU) which may be a
modem or a setup box."
"There are two modes of connecting to the Internet via VSAT. One is
through a 2-way satellite Internet connection (duplex) and another one
is through a telephone line-return Internet connection (simplex)."
"A satellite Internet connection allows the user to send (upstream)
and receive (downstream) data to and from the Internet through a
satellite. This is a good option for users in remote areas that do not
have access to DSL or cable modem facilities."
"In contrast, a one-way satellite Internet connection allows the user
to download data from a satellite downlink and to send outgoing data
through a regular telephone line. A one-way satellite Internet
connection is meant to reduce costs."
"Satellite Technology as an Internet Access Medium"
http://www.belltel.ph/techno.htm
A practical example on connecting through the internet using VSAT can
be found in our next article.
"What I do is set up the dish, and I have a 2.4Ghz wireless connection
from my from truck using a LinkSys Cable Router and a small antenna
for the 2.4Ghz LAN on the roof of my truck. The LinkSys is connected
to the VSAT modem and in about 2-5 minutes you are on the Internet. I
am using the LinkSys USB Wireless adaptor that give me great range
over the PCMCIA cards or the new USB12 Wireless adaptors."
"VSAT for High Speed Internet access needs"
http://www.redhummer.net/vsat/
3. Technical Specifications
A sample VSAT architecture that enables internet access through
satellite can be seen in our next links. This is for illustrative
purposes only and is not an endorsement of the product.
Shiron: Intersky Applications
http://www.shiron.com/vsat.htm
http://www.shiron.com/applications.htm#architecture
Search terms used:
vsat technology basics architecture modem internet
I hope these links would help you in your research. Before rating this
answer, please ask for a clarification if you have a question or if
you would need further information.
Thanks for visiting us.
Regards,
Easterangel-ga
Google Answers Researcher |
