A university has two campus locations A and B separated by a $20$ km line$-$of$-$sight in an urban area. Each campus has a communication infrastructure that provides communication services to users. The usage demands for the two campuses are summarised in the following table:

Campus A

Campus B

Required data speed per user

$20$ Mbps

$20$ Mbps

Number of concurrent users

$100$

$80$

Percentage of wireless users

$40\%$

$50\%$

User$$s access probability

$30\%$

$30\%$

Network inaccessibility

Less than $0\mathrm{.}01\%$

Less than $0\mathrm{.}01\%$

Provide a conceptual design of the communication infrastructure for the university and report on the following aspects:

$1.$ Decide a suitable network architecture and topology to serve the communication requirements of users. Design the schematic diagrams for the local area network $($LAN$)$ of each campus, showing how the fixed and wireless users are connected to the network, indicating the suitable network equipment such as routers, and switches and how they are connected within the network.

$2.$ Use the network blocking model to determine the maximum number of concurrent users at each campus to ensure that the network inaccessibility requirement is satisfied.

$3.$ The two campuses are linked using microwave links. Calculate the required capacity for the links, considering the inaccessibility requirement.

$4.$ Assuming the average terrain obstacle height of $15$ m between the two campuses, calculate the minimum antenna height at each campus location to ensure a reliable line$-$of$-$sight link operation.

$5.$ If the microwave links operate in the $2\mathrm{.}4$ GHz band and use receivers with a sensitivity of $-100$ dBm$,$ determine the free space path loss, the antenna gain and the required transmitting power to achieve the link design margin of $20$ dB$.$

$6.$ Discuss other aspects of the system design that are not considered above but are relevant and should be considered.

$7.$ Provide a short reflection of your learning achieved from doing this design assignment and link them up with Engineers Australia$$s Stage $1$ Competency standard.