User guide

Understanding Canopy Networks March 2005
Through Software Release 6.1
Issue 1 Page 39 of 425
Canopy System User Guide
For example, 900-MHz APs and SMs are logical choices for extending Canopy 2.4-, 5.2-,
and 5.7-GHz radio networks where you wish to
◦ add subscriber-handling capacity to a tower that is either
− fully used in the other frequency band ranges.
− not available to any other frequency band range.
◦ reach sparsely populated areas.
◦ penetrate foliage.
◦ add a remote AP behind an SM that operates in another frequency band range.
5.1.5 Backhaul Module
The Backhaul Module (BH) provides point-to-point
connectivity in either
◦ a standalone RF or wired link to another BH
◦ a wired link through a cluster management module
to an AP cluster.
You must configure a BH as either a timing master (BHM)
or timing slave (BHS). The BHM provides sync to the BHS.
A BH mounted to a passive reflector dish is pictured in
Figure 5.
Figure 5: Dish-mounted BH
5.1.6 45-Mbps Backhaul Module
The 45-Mbps BH provides point-to-point
data connectivity via a 5.8-GHz wireless
Ethernet bridge that operates at
broadband data rates. The 45 Mbps
Backhaul serves enterprises that need to
connect the Local Area Networks (LANs)
of two or more buildings.
The 45-Mbps BH provides non-Line of
Sight (NLOS) operation through the use
of both Orthogonal Frequency Division
Multiplex (OFDM) modulation and Multi-
Beam Space Time Coding (STC).
Transmissions penetrate foliage and
such that almost universal coverage is
typical at short range.
The 45-Mbps BH link consists of a pair of
identical BHs that transmit and receive
on an automatically selected but
configurable frequency. The installer sets
up one unit as the master and the other
as the slave. (Each unit is preconfigured