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T3 The T-carrier system, introduced by the
Bell System in the U.S. in the 1960s, was the first successful
system that supported digitized voice transmission. The original
transmission rate (1.544 Mbps) in the T-1 line is in common use
today in Internet service provider (ISP) connections to the
Internet. Another level, the T-3 line, providing 44.736 Mbps, is
also commonly used by Internet service providers.
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