Hello,

Please support providing a solution for the below-mentioned question for understanding the concepts.

In relation to communications networks, briefly, define the function of a data-link protocol and then explain what is meant by the terms "FEC" and "BEC" and describe their basic principle of operation. (b) A satellite orbits a planet's surface at a distance of 300km with communication between the surface and the satellite facilitated by a 100kHz channel intended to support 128kbit/s. The measured SNR of the channel is 7dB, giving rise to a BER of 104. The data-link protocol used adopts a frame with a 240 byte payload and an overhead of 16 bytes with the latter supporting 8 bits for sequence identification. The channel's propagation constant is 3108m/s. i) Showing your working, confirm that the desired channel rate is achievable. ii) Determine how long it would take for a single frame (sent from the surface) to be received by the satellite. iii) Calculate the probability that a data-link frame would be received without an error. (c) The surface to satellite link supports a simple video link where each video frame consists of 256 rows based upon 240 columns of 8 bit samples. If sequence order is to be maintained, calculate the effective (image) frame transfer rates for the link for ALL appropriate BEC mechanisms. Compare these rates with that associated with a proposed FEC scheme where 200% redundancy is applied. 25% (d) In the film "The Martian", astronaut Mark Watney was abandoned on the surface of the planet Mars; approximately 72 million miles from Earth. Due to orbital effects, the link between Mars surface and the satellite is only connected for 8 minutes every 24 hours while the remainder of the time, the 100kHz (data-link) channel is used to relay information between the satellite and Earth. Compared to the shorter distance channel, the satellite to Earth communications channel experiences a 15dB reduction in SNR leading to a reduction in channel capacity. i) Determine the revised capacity of the long-distance link. ii) Determine the end to end delay to send one data-link frame to Mission Control by the orbital station. Which data-link between satellite and Earth. approach (FEC or BEC) would be the most appropriate to iii) In the film, Mark Watney sent a message back to Earth by underpin the relay of such images back to Mission Control? uploading a number of image frames to the satellite during Justify your answer. the 8 minute window. These images were then relayed hack