Winstar Comm. (WCII) Message Board

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Technology Stocks : Winstar Comm. (WCII)

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To: Bernard Levy who wrote (10120)	1/22/1999 10:57:00 PM
From: Peter Ecclesine	Read Replies (2) of 12468

Hi Steve, Attenuation (in dB/km) for horizontal path due to rain, gases and fog CCIR 719,712 Frequency 8GHz 18GHz 28GHz 38GHz 48GHz 58GHz Rainfall 1"/hr .14 2 4.6 6.6 8 9 2"/hr .6 4.6 9 13 15 17 6"/hr 2 15 23 33 38 43 So if a normal link strives to have 20dB margin in worst case operation, maximum path length can be calculated from radiated power and worst case rainfall expected. e.g. 38GHz, Miami = 6"/hr rainfall = 33dB/km attenuation .001% of the year, with 120 dB link budget (from antenna sizes and transmit power), a 4km link will have < 99.999 availability, but a 3.5km link would achieve five nines. Raising the link budget to 132dB would enable the 4km link to have five nines availability. If the link is in Barstow = 1"/hr rainfall = 6.6dB/km .001% of the year, with 120dB link budget, 18km link will achieve five nines availability. Rainfall attenuation is negligible below 10GHz. petere

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