19. Calculate the delay bandwidth product for the following links. Use one-way delay, measured from first bit sent to first bit received.

(a) 100-Mbps Ethernet with a delay of 10 s.

(b) 100-Mbps Ethernet with a single store-and-forward switch like that of Exercise 16(b), packet size of 12,000 bits, and 10 s per link propagation delay.

(c) 1.5-Mbps T1 link, with a transcontinental one-way delay of 50 ms.

(d) 1.5-Mbps T1 link between two groundstations communicating via a satellite in geosynchronous orbit, 35,900 km high. The only delay is speed-of-light propagation delay from Earth to the satellite and back.