Assume that, in a Stop-and-Wait system, the length of the line is 10 Km, the volume of the pipe is 5Kbytes, and 1 bit takes 40 milliseconds to make a round trip. What is the bandwidth of the line?

Consider TDM-based circuit switching with 8000 frames per second and 32 time slots per frame. During each time slot 8 bits are sent. Assuming it is possible to combine several circuits, how many circuits does it take to keep the transmission time of a 1 Mbyte file below 15 seconds?

What is the propagation delay on a circuit using a LEO satellite orbiting 500 miles above the earth if the speed of the signal is 186,000 miles per second? If the satellite is 22,000 miles above the earth?

Television channels are 6 MHz wide. How many bits/sec can be sent if four-level digital signals are used? Assume a noiseless channel.

Given a channel with an intended capacity of 20 Mbps, the bandwidth of the channel is 3 MHz. what signal-to-noise ratio is required to achieve this capacity?

If the signal at the end of a 6km cable has a power value of 2, if you knew that this cable loses 0.5 dB per km (i.e. -0.5 dB/km), then the power of the signal at the beginning of the cable was ..............

Consider TDM-based circuit switching with 8000 frames per second and 32 time slots per frame. During each time slot 8 bits are sent. What is the bit rate of one circuit in kbps?

Calculate the minimum timeout value for a stop-and-wait algorithm running over a 50-meter point-to-point copper link. Assume a minimum delay of 5 µs at the receiver.  If you know the distance between two points, you can calculate the speed-of-light latency, although you have to be careful because light travels across different media at different speeds: It travels at 3.0 × 108 m/s in a vacuum, 2.3 × 108 m/s in a copper cable, and 2.0 × 108 m/s in an optical fiber.

A line has a signal-to-noise ratio of 1000 and a bandwidth of 4000 kHz. What is the maximum data rate supported by this line? If the bandwidth of the channel is 5 kbps, how long does it take to send a frame of 100,000 bits out of this device? What is the maximum data rate of a channel with a bandwidth of 200 kHz if we use four levels of digital signaling?

Given a bandwidth of 10,000 Hz (1000 to 11,000 Hz), draw the full-duplex ASK diagram of the system. Find the carriers and the bandwidths in each direction. Assume there is no gap between the bands in the two direction.