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Transmission Delay

A two-port bridge connects on the end of a cable of length X m. to the end of a similar cable of length 3x/2 m. Hosts are attached at various points on the cable system, which operates as a shared-access LAN implementing the CSMA/CD protocol with a minimum frame length of 512 bits. The bridge imparts a delay in forwarding frames that is equal to a time duration (transmission delay) of a frame. Assume a bit rate of 100 Mbps on the cable, and a propagation speed of 2.5 x 10^8 m/s
a. What is the minimum forwarding delay at the bridge?
b. What is the maximum allowable value Xmax of X?
c. The system is built with X-Xmax. An engineer argues that the host on the sort side of the bridge can use a minimum frame length shorter than 512 bits if they are talking to other hosts on the same side. Is he correct?

Solution Summary

This solution explains in 128 words the concept of minimum forwarding delay, maximum distance, and propogation time, as well as provides calculations for each. The solution is attached in a .doc file.