We assume each MAU delays by 0.2us when passing data. 10 MAUs will delay 2.0us. Also we assume the MAU at B takes the 0.9us maximum to send the collision signal. This number corresponds well with the maximum segment length from node to hub defined by 10BaseT which is 100 m. As we can see the main factors involved in determining the segment length is not attenuation, but rather the topology used and the minimum packet size sent.
Twisted pair is the most common transmission medium for both analog and digital signals.
It is still used by the telephone company as the main transmission medium for local loops and Private Branch Exchanges. Typically, several hundred pairs are bundled together to form a distribution cable. Twisting the wires together reduces low-frequency interference. By using different twist lengths in adjacent pairs the amount of cross talk is reduced between pairs in distribution cables. Compared to other medium, such as coaxial or fiber optic cable, twisted pair is quite succeptable to interference and noise.