In an optical fibre, the power drops by a factor of 10 approximately every 30 km. If the transmit power is 0.35 W, how far will a signal be transmitted before the power is attenuated to 350 μW? As part of your answer, include a table showing the signal power (in W) vs. distance in 30 km intervals (like Table 1.2 in Section 1.4.4). If a high-quality coaxial cable (LDF5-50A) operating at 200 Mbps is used instead of an optical fibre, how would you expect the calculated distance value to change? Briefly explain your answer (see Section 1.4.4). You are not required to include another table.
Permutations and Combinations
If there are 5 dishes, they can be relished in any order at a time. In permutation, it should be in a particular order. In combination, the order does not matter. Take 3 letters a, b, and c. The possible ways of pairing any two letters are ab, bc, ac, ba, cb and ca. It is in a particular order. So, this can be called the permutation of a, b, and c. But if the order does not matter then ab is the same as ba. Similarly, bc is the same as cb and ac is the same as ca. Here the list has ab, bc, and ac alone. This can be called the combination of a, b, and c.
Counting Theory
The fundamental counting principle is a rule that is used to count the total number of possible outcomes in a given situation.
- In an optical fibre, the power drops by a factor of 10 approximately every 30 km. If the transmit power is 0.35 W, how far will a signal be transmitted before the power is attenuated to 350 μW?
As part of your answer, include a table showing the signal power (in W) vs. distance in 30 km intervals (like Table 1.2 in Section 1.4.4).
If a high-quality coaxial cable (LDF5-50A) operating at 200 Mbps is used instead of an optical fibre, how would you expect the calculated distance value to change? Briefly explain your answer (see Section 1.4.4).
You are not required to include another table.
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