How many bits will fit in the cable of length 100 km long cable running at the t1 data rate
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The propagation speed in the cable is 200,000 km/sec, or 200 km/msec, so a 100km cable will be filled in 500 usec. Each T1 frame is 193 bits sent in 125 usec. This corresponds to four frames, or 772 bits on the cable. or If only data bits are considered, it is 192 x 4 = 768 bits.
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