a.What is the attenuation of 350 ft of RG-11 U coaxial cable at 100 MHz? b. A transmitter has an output power of 3 W that is fed to an antenna through an RG58A/U cable 20 ft long. How much power reaches the antenna? c. Two engineers have a disagreement over the selection of transmission line for connections within a 100m Data Centre on a project that is at risk for cost overrun. The first engineer is arguing in favor of using multi-mode fibre while the second engineer would like to use single mode fibre. You are the project engineer. Decide which of the two transmission lines to use and justify your answer. d. For typical silica optical fibres with ncore = 1.45 and Δ = 5 x 10-3, calculate nclad and NA e. For a typical silica fibre with D (@ λ = 1.3μm) = 2.5 nm ps/km and a semiconductor laser source centred on λ = 1.3μm with Δλ = 4nm: the bandwidth length BL ≈ 100 Gbps km (singlemode, step-index). What transmission speed is possible at a distance of 5km? f. A link from point a to point b is using bidirectional transceivers with transmit power of 3.79dB. The receiver sensitivity is -23 dBm. The designed system margin is 6dB. There are 5 splices on the link each with loss of 0.2dB. The attenuation per km is 0.5dB. Calculate the received power if a 5dB attenuator is used and the length of the link is 15km.
a.What is the attenuation of 350 ft of RG-11 U coaxial cable at 100 MHz?
b. A transmitter has an output power of 3 W that is fed to an antenna through an RG58A/U cable 20 ft long. How much power reaches the antenna?
c. Two engineers have a disagreement over the selection of transmission line for
connections within a 100m Data Centre on a project that is at risk for cost overrun. The
first engineer is arguing in favor of using multi-mode fibre while the second engineer
would like to use single mode fibre. You are the project engineer. Decide which of the
two transmission lines to use and justify your answer.
d. For typical silica optical fibres with ncore = 1.45 and Δ = 5 x 10-3, calculate nclad and
NA
e. For a typical silica fibre with D (@ λ = 1.3μm) = 2.5 nm ps/km and a semiconductor
laser source centred on λ = 1.3μm with Δλ = 4nm: the bandwidth length BL ≈ 100 Gbps
km (singlemode, step-index). What transmission speed is possible at a distance of 5km?
f. A link from point a to point b is using bidirectional transceivers with transmit
power of 3.79dB. The receiver sensitivity is -23 dBm. The designed system margin is
6dB. There are 5 splices on the link each with loss of 0.2dB. The attenuation per km is
0.5dB. Calculate the received power if a 5dB attenuator is used and the length of the
link is 15km.
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