Product Description 18
Table 2: Rain and attenuation
Rain Attenuation
Drizzle (0.25 mm/hr) 0.2 dB/km
Light Rain (2.5 mm/hr) 1.8 dB/km
Medium Rain (12.5 mm/hr) 5.6 dB/km
Heavy Rain (25 mm/hr) 9.5 dB/km
Downpour (50 mm/hr) 17 dB/km
Tropical (100 mm/hr) 28 dB/km
Monsoon (200 mm/hr) 38 dB/km
The following figure shows the absorption loss due to the rain level (seasons):
Figure 3:
Variation in Loss/km with frequency and rain rate
Drizzle - 0.25 mm/hr; Light rain - 2.5 mm/hr; Medium rain - 12.5 mm/hr; Heavy rain - 25 mm/hr.
l Short range
The range of a 60 GHz cnWave link can be limited due to oxygen absorption and rain fade which
needs to be factored in for link planning. One advantage of a shorter range is frequency re-
usability and security (since the signal does not travel long distances).
802.11ay Standards and advantages
IEEE 802.11ay is an IEEE standard that covers 60 GHz cnWave, this standard is an amendment of the IEEE
802.11ad standard. There are IEEE 802.11ay is designed with a higher throughput capacity of over 10 Gbps
data rate over distances of 200 to 500 meters. 802.11ay includes features such as Channel Bonding and
Synchronization. 802.11ay based 60 GHz solution transforms fixed wireless access from a broadband
option of last resort into a competitive alternative to fiber and cable-based solution.
This standard is designed with a throughput capacity of over 10 Gbps data rate over distances of 200 to
500 meters. 802.11ay includes features such as Channel Bonding and Synchronization. 802.11ay is WLAN
type in the IEEE 802.11. It has a frequency of 60 GHz. It has also been noted that it is likely to have
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