What is TDM/TDMA? What is TDM/TDMA?
Perhaps the best known VSAT network architecture is the Time Division Multiplex/Time Division Multiple Access network, used around the world for low speed (300 bps - 19,200 bps) data communications such as credit card processing and verification, point-of-sale inventory control, and general business data connectivity.
A typical TDMA network employs a large satellite hub system that manages all network terminal access and routing. Data is transmitted to and from the hub in short bursts on satellite channels that are shared with 30 to 40 other terminals (depending upon network loading parameters). The hub communicates with these VSAT terminals over a higher-speed "outbound" TDM satellite carrier. The terminals transmit back to the hub on their assigned "inbound" carriers using TDM protocols. This combination allows a certain number of slots in time each second that each terminal can transmit data, and can dynamically assign more or less time to terminals based upon their individual requirements. With this type of assignment, maximum network efficiency and throughput is maintained.
What size are the VSAT antennas?
Sub-Meter to 2.4 meter depending upon locations.
Who would want TDM/TDMA?
The prime customers of this service are large corporations which frequently receive data from distributed data sources and transmit to dispersed locations.
- Banks and Financial Institutions (Global Bank, GTB)
- Car dealers (Honda,Toyota), Banks
- Large retail chains (Mr.Biggs, Tantalizers), hotels (Hilton, Sheraton)
- Transport industry
Customers could include banking, manufacturing and engineering avenues, and one can append to the list any institution which is not adversely affected by minor time delays.
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