In the 1970s, Bell Labs developed higher rate systems. T1C with a more sophisticated modulation scheme carried 3 Mbit/s, on those balanced pair cables that could support it. T-2 carried 6.312 Mbit/s, requiring a special low-capacitance cable with foam insulation. This was standard for. T-4 and T-5 used coaxial cables, similar to the old used by AT&T Long Lines. TD systems were also fitted with high rate modems to allow them to carry a signal in a portion of t.
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