A channel bank is critical to digital telecommunication. Every phone company has a central public exchange. The channel bank converts analog voice and data signals into digital signals that are then transmitted from the public exchange to other exchanges. The lines that connect the public exchange to other exchanges are high speed and accept digital signals. Each digital signal, also known as DSO, is transmitted at 64 Kbps. The signal is combined with other digital signals to be transmitted over the same circuit by a technique known as Time Division Multiplexing.
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