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1. What transmission media are used for computer networks?
2. What is the transmission media used in cellular networks like LTE?
3. An image has a size of 1920x1080 pixels (Full HD) with true color, which means that 3 bytes per pixel are used for the color information.
(a) How long does it take to transmit the uncompressed image via a . . .
• 56 kbps Modem connection?
• 64 kbps ISDN connection?
• 1 Mbps DSL connection?
• 10 Mbps Ethernet connection?
• 16 Mbps DSL connection?
• 100 Mbps Ethernet connection?
• 1 Gbps Ethernet connection?
Hint: 1 kbps = 1,000 Bits per second
1 Mbps = 1,000,000 Bits per second
1 Gbps = 1,000,000,000 Bits per second
(b) Assume the image is compressed with a compression algorithm that reduces the image size by 85%. How long does it take to transmit the image via a . . .
• 56 kbps Modem connection?
• 64 kbps ISDN connection?
• 1 Mbps DSL connection?
• 10 Mbps Ethernet connection?
• 16 Mbps DSL connection?
• 100 Mbps Ethernet connection?
• 1 Gbps Ethernet connection?
4. A MP3 file with a size of 30 ∗ 106 bits must be transferred from terminal device A to terminal device B. The signal propagation speed is 200,000 km/s. A and B are directly connected by a link with a length of 5,000 km. The file is transferred as a single message, and no network protocol headers or trailers exist.
Calculate the transfer time (latency) of the file, when the data rate of the computer network between both terminal devices is. . .
• 56 kbps
• 64 kbps
• 1 Mbps
• 16 Mbps
• 100 Mbps
5. Imagine, NASA sent a spacecraft to planet Mars, which landed there. A 128 kbps (kilobit per second) point-to-point link is set up between planet Earth and the spacecraft.
The distance between Earth and Mars is 55,000,000 km. The signal propagation speed is 300, 000, 000 m/s, which is the speed of light.
(a) Calculate the Round Trip Time (RTT) for the link.
RTT = (2 * distance) / signal propagation speed
(b) Calculate the bandwidth-delay product for the link to find out what is the maximum number of bits, that can reside inside the line between the sender and receiver?
Transmission delay = 0 s
Waiting time = 0 s
(c) A webcam at the surface of planet Mars sends pictures to Earth. Each image has a size of 20MB (1MB = 220 Byte). How quickly can it reach Mission Control on Earth?