Comtech VIPERSAT Selected Time-Division Multiple Access (STDMA)

Selected Time Division Multiple Access (STDMA) provides shared bandwidth access networks with a low initial hub cost as compared to traditional TDMA networks. This low cost, achieved by using a fast acquisition SCPC demodulator as the burst controller allows users with small to moderately sized networks to take advantage of demand driven space segment usage without a huge capital investment in hub hardware. STDMA is easily scalable to allow for network growth simply by adding burst controllers at the hub to accommodate additional groups of remote terminals.

The basic system is comprised of a Time Division Multiplexed (TDM) outbound which is shared by all remotes in the network. The return channels are Selective Time Division Multiple Access (STDMA). STDMA has two modes of slot allocation operation, fixed or dynamic. In fixed mode all remotes within a group are granted the same amount of transmission time in a cycle. When operated in dynamic mode, to take advantage of the bursty nature of IP traffic, the return channels are dynamically sized (in terms of transmission time in frame) based upon demand. All IP protocols are supported. Since under most circumstances it makes more sense to operate the network in dynamic mode, descriptions in this document address primarily dynamic mode operation. STDMA provides an extremely flexible platform supporting any type of data and streaming protocols.


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