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A T1 is 8000 frames per second. Each frame is 193 bits: a frame bit, followed by 24 8bit channels. 8000 * (1 + 8 * 24) gives a line rate of 1,544,000. Remember, the T1 was designed for voice applications. This method of multiplexing delivers 5.2microsec of data (a single PCM code) every 125microsec. This makes buffering for analog phones unnecessary. (just ...


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Each of the 24 time slots gets 64,000 bits, giving you a data rate of 1,536,000. It is only if you count the framing bits do you get the 1.544 Mbps. You can get a fractional T1 where you use only certain time slots, or you can get a full T1 where you use all the time slots and get the full 1.536 Mbps. The multiplexing is that each input gets one or more ...


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