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A VSAT PrimerALL VSAT services are based on one of two technologies: single carrier per channel (SCPC) and time-division multiple access (TDMA). Here are some key differences between the two: Design SCPC is a point-to-point technology, making it the VSAT equivalent to conventional l eased lines. With TDMA networks, numerous remote sites communicate with one central hub--a design that's similar to packet-switched networks. Bandwidth As a leased-line equivalent, SCPC can deliver dedicated bandwidth of up to 2 Mbit/s. Remote sites in a TDMA network compete with one another for access to the central hub, limiting the maximum bandwidth in most cases to 19.2 kbit/s. Applications SCPC can accommodate traffic that runs over leased lines, including voice, data, and fax transmissions. TDMA is best suited to handling data transactions between remote sites and a central hub. Cost In most cases, SCPC services cost the same as their leased-line equivalents, which makes them fairly expensive. In contrast, TDMA services are relatively low-cost. Deployment All international VSAT services in Asia-Pacific are based on SCPC. Most domestic offerings are based on TDMA, although some domestic operators offer point-to-point SCPC links as well. [ Home ]
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