a) Given a 100-Watt power source and using Figure 1 below that shows attenuation of typical guided media, what is the maximum allowable length for the following transmission media if a signal of 1 Watt is to be received? (10 marks) i. 24-gauge (0.5 mm) twisted pair operating at 300 kHz ii. 24-gauge (0.5 mm) twisted pair operating at 1 MHz 0.375-inch (9.5 mm) coaxial cable operating at 1 MHz iv. 0.375-inch (9.5 mm) coaxial cable operating at 25 MHz optical fiber operating at its optimal frequency V. 30 3.0 25 2.5 26-AWG (0,4 mm) 34-AWG (0.5 mm) 22-AWG (0,6 mm) 19-AWG (0.9 mm) 20 2.0 Attenuation (dB/km) 15 Attenuation (dB/km) 1.5 10 1.0 S 0.5 0 0 102 10 107 10 10 106 Frequency (Hz) (a) Twisted pair (based on [REEV95) 800 900 1000 1100 1200 1300 1400 1500 1600 1700 Wavelength in vacuum (nm) (c) Optical fiber (based on [FREE02] 30 30 25 25 0.5 mm twisted pair 20 20 3/8" cable 19.3 mm) Attenuation (dB/km) 15 Attenuation (dB/km) 15 9.5mm Coat 10 10 typical optical fiber 5 5 0 10 106 10 10 1012 Jols 0 107 102 10 Frequency (Hz) I kHz 1 MHZ I GHz 1 THz Frequency (Hz) (b) Coaxial cable (based on [BELL.90 (d) Composite graph Figure 1. Attenuation of Typical Guided Media