User's Guide

Chapter 2: Product Description
15
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
• Short range
The max range of 60 GHz links are limited to up to 2 km under best of circumstances. The range gets limited due to
oxygen absorption and rain fade which needs to be factored in for link planning. One advantage of shorter range is
frequency re-usability and security (since the signal does not travel long distances).
Introduction to 802.11ay and advantages
802.11ay is IEEE standard which covers 60 GHz, this is standard is an upgrade from 802.11ad standard. There are 802.11 ay 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 really transforms fixed wireless access
from a broadband option of last resort into a competitive alternative to fiber and cable-based solution.
802.11ay standard has following advantages with Terragraph solution:
• Channel Bonding
802.11ay standard has channel bonding capability to combine adjacent channels to form wider channels, in this case wider
channel combine to form 4.32 GHz, there are additional wider channels created which provide double capacity throughput
compared to 802.11 ad standard.
• Network Synchronization
Synchronization is used to control the transmit and receive signals to prevent self-interference. Radios assigned with
the same polarity will be transmitting and receiving at the same time.
There are two types of polarity:
o Odd Polarity
o Even Polarity
• Mesh Routing
Mesh is interconnection among devices which could have multiple paths between any two nodes, some advantages of
using mesh are better connectivity, capacity sharing, Load balancing and re-routing in case of link failure.