Guided transmission media · Twisted pair · Coaxial cable Optical fiber Table 4.1 Point-to-Point Transmission Characteristics of Guided Media [GLov98] Frequency Range Typical Attenuation Typical Delay Re epeater spacing Twisted pair(with 0 to 3.5 kHz 0.2 dB/km a l khz Hs/km 2 km loading) Twisted pairs(multi-pair 0 to I MHz 0.7 dB/km a 1 kHz 5 us/km 2 km axial c 0 to 500 MHz 7 dB/km (a 10 MHz 4 us/km I to 9 km Optical fiber 186 to 370 THz 0.2 to 0.5 dB/km 5 us/km 40 km THz= TeraHerz= 102H4 Guided Transmission Media • Twisted Pair • Coaxial cable • Optical fiber