Measure of digital channel capacity. Pairgain - The term "pairgain" is used for any piece of equipment that will allows multiple voice channels to leave the CO as T1. It then terminates on a piece of equipment out in the field that will take that T1 signal and use the 24, 64 kbps DS0 channels for voice applications. POTS - Plain Old Telephone Service. Regular old-fashioned analog loop start phone service.
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