User guide

Canopy
®
OFDM Backhaul Solutions
Backhaul Solutions for the Most Challenging Locations and Applications
Key Technical Features – Canopy OFDM Backhaul Radios
The Canopy 30/60 and 150/300 Mbps OFDM Backhaul Radios use the innovative combination of
technologies to deliver unsurpassed range, capacity, reliability and performance – especially in nLoS or
NLoS conditions, and in areas where there is a significant RF interference, such as a city. The nLoS and
NLoS capabilities provide a higher tolerance for obstructions and enable the network operator to establish
network connections over hills, around buildings, through trees and over water.
Canopy 30/60 and 150/300 Mbps OFDM Backhaul Radios - Similarities:
The 30/60 and 150/300 Mbps OFDM Backhaul Radios share many feature characteristics, including:
• Dynamic Frequency Selection (DFS) automatically changes channels to avoid interference and
combat link fading without user intervention. At power-up and throughout operation, the radio scans
the band — 400 times a second — and automatically switches to the clearest channel. The 25-hour,
time-stamped database provides alerts to any interference that does exist and provides statistics to
help analyze these patterns. DFS creates “licensed band-like interference-free performance in an
unlicensed band!”
• Adaptive Modulation ensures maximum throughput optimized for the radio path, even as path
characteristics change. The transmitter and receiver negotiate the highest mutually sustainable data
rate — then dynamically “upshift” and “downshift” the rate as RF conditions change.
• Built-in Security Protection via a complex proprietary signal with scrambling applied.
• Dual Polarized Antennas - two transmitters and two receivers are used to establish a link, enabling
four different transmitter/receiver combinations. By creating four distinct transmission beams, the
chances that data will get through increase significantly.
• Transmit Diversity transmits two redundant signals, spaced in time, to bring multi-path signals into
phase, resulting in better performance and link availability. The radio radiates multiple beams from
the antenna — the effect of which is significant protection against fading and increased probability of
making a connection and reading the transmitted data. Alternatively, if this feature is turned off, the
radio will operate in Dual Payload mode whereby different data is transmitted in parallel on each
signal - effectively doubling the bandwidth at the higher modulation rates.
• Orthogonal Frequency Division Multiplexing (OFDM) In addition to Transmit Diversity transmitting
the data twice, OFDM sends these transmissions over multiple frequencies, or sub-carriers. The
multiple sub-carriers allow higher channel bandwidth & higher resistance to two factors:
(1) Multi-path interference - occurs when objects in the air gap split a beam into parts that travel
different paths and interfere with each other at the receiver.
(2) Frequency selective fading – occurs when amplitudes of arriving signals cancel each other out
at the receiver.
In typical radios this would be a problem, but with OFDM radios this actually helps as they can re-
correlate the interfering signals which results in a better chance of receiving the signal through
reflective behavior.
• Built-in Security - To ensure a secure connection, each pair of outdoor units comes preset with its
own built-in IP address as well as the MAC address of the other outdoor unit to which it will connect.
The preset addresses enable the system security features and allow the two units to communicate
only with each other.
• Physical Form Factor – The 30/60 and 150/300 share the same form factor and are offered with
Integrated or Connectorized* antennas. Power Supply** supports -48V DC and AC
48V Cable size is
2.5mm 2 stranded or
14 Aw
g
stranded.
Integrated Connectorized*
* Connectorized antennas sold separately. See page 30 & 33 for a list of 1-2’ Flat Panels and 2-6’ Parabolic Antennas
** Power Supply is outdoor temperature rated -40°C to +60°C – Requires a weatherproof enclosure when mounting outdoors.
Issue 4, March 2005 Page 11 of 30