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(Very Small Aperture satellite Terminal) A small earth station for satellite transmission that handles up to 56 Kbits/sec of digital transmission. VSATs that handle the T1 data rate (up to 1.544 Mbits/sec) are called "TSATs."
(Time Division Multiple Access) A satellite and cellular phone technology that interleaves multiple digital signals onto a single high-speed channel. For cellular, TDMA triples the capacity of the original analog method (FDMA). It divides each channel into three subchannels providing service to three users instead of one. The GSM cellular system is also based on TDMA, but GSM defines the entire network, not just the air interface.
vsat is a very small aperture terminal, and its previllage that the earth station is having a smaller size of antenna compared to those used in satellites earth stations. it is primarily used for data communication by companies the speed is not fast the main station is having a hub where other places can communicate all over th world thru that hub so it has some privacy. it uses TDMA in transmission.
Satellite transmits in broadcast mode, so the terminals at earth (say VSATs) can receive all the transmitted frame but selects only the portion which is meant for it in a particular time slot. Thus, we can say satellite broadcast a TDM (Time Division Multiplex) frame.
2. Terminals at the earth wait for their turn (or time slot) to send the data towards satellite. That is every terminal access the satellite at its turn(time slot) and the transmission mode is TDMA (Time Division Multiple Access).
Satellite to earth for all terminals - TDM
VSATs to satellite-in their time slot-TDMA
:idea:
-Sidd
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