Assume you are working as a Network Engineer for a Telecommunications service provider and your task is to estimate the feasibility of a 20 km link between two buildings with one access point and one client radio. The access point is connected to an antenna with 12 dBi gain, with a transmitting power of 500 mW and a receive sensitivity of -84 dBm.  The client is connected to an antenna with 10 dBi gain, with a transmitting power of 16 dBm and a receive sensitivity of -82 dBm. The cables in both systems are short, with a loss of 3 dB at each side at the 900 MHz frequency of operation. What is the link margin? By examining the link margin, comment on the reliability of the link.

For data is transmitted over twisted-pair cable, you have these characteristics: A signal's power on the channel is 60 dB, signal attenuation is 2 dB per 100 meters, and average noise power on the cable is 0.15 dB per meter. Answer the following questions: What's the S/N ratio at the end of a 60-meter channel? What's the S/N ratio at the end of a 1.5-kilometer channel? What's the maximum channel length if the receiving device requires at least 25 dB of S/N ratio for reliable operation?

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Sub:communication. Need solution please