Hz) mainly due to smaller channel bandwidths (14-56 MHz). It is possible to offer the same capacity in the traditional microwave bands but multiple indoor and outdoor microwave units will be required and with 10 times the cost of the Gigabit radios. Gigabit Ethernet Radios sometimes called Millimeter Wave Radios since these links operate in the millimeter band. According to its name Millimeter Wave (MMW) or Millimeter Band has a wavelength of 10 to 1 millimeter. MMW is part of the Extremely high frequency (EHF) band which is the highest radio frequency spectrum. EHF runs the range of frequencies from 30 to 300 gigahertz just below the terahertz radiation which falls under 300 GHz and 3 THz. The oxygen absorption is detrimental at 60 GHz and thus the focus has been on 70/80 GHz radios that are mainly prone to rain [2]. In the 70/80 GHz bands the effects of gaseous absorption and clouds/fog are noticeable, but will not have a major impact on short paths. At 70 and 80, the atmospheric attenuation is similar to the traditional microwave frequency bands of 18 and 38 GHz and less compared to that of 60 GHz band. Figure 7.3 illustrates specific attenuation in the range of 50-70 GHz at different altitudes from ITU-R P.676-7. Frequency (GHz) Specific attenuation in the range 50-70 GHz at the altitudes indicated (0 km, 5 km, 10 km, 15 km and 20 km) Figure 7.3 Atmospheric attenuation at 50-70 GHz at different altitudes. Reproduced from © 2007 ITU-R [2] Next Generation Mobile Communications Ecosystem Path length (2.53 km) site_01 Frequency (MHz) = 73000.0 site_02 Latitude 33 41 36 21 N Latitude 33 40 49 69 N Longitude 073 41 32 51 E K = 1.33, 0.67 Longitude 073 40 11 60 E Azimuth 232,52° %F1 = 100 00, 40.00 Azimuth 55,51° Elevation 1232 m ASL Elevation 1335 m ASL Antenna CL 10.0 m AGL Antenna CL 10.0 m AGL Figure 7.4 Gigabit radio coverage in Pakistan Path length and signal attenuation due to rain are the two most important factors in the evaluation of Gigabit radios. Path length is inversely proportional to link availabilit