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Definition of "Local Exchange Carrier" |
Local Exchange Carrier is the term for a public telephone company in the U.S. that provides local service. Some of the largest LECs are the Bell operating companies which were grouped into holding companies known collectively as the regional Bell operating companies when the Bell System was broken up by a 1983 consent decree. In addition to the Bell companies, there are a number of independent LECs, such as GTE. / Phase Shift keying is a digital modulation scheme that conveys data by changing, or modulating, the phase of a reference signal. Any digital modulation scheme uses a finite number of distinct signals to represent digital data. |
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