System Overview and Site Planning

Definitions:

Backhaul Timing Master – a module that is used in a point-to-point link. This module controls the air protocol and configurations for the link.

Backhaul Timing Slave – a module that is used in a point-to-point link. This module accepts configuration from the master module.

Cluster Management Module – a module that contains power, GPS timing, and networking for backhaul timing master(s). Can also be utilized in conjunction with an access point cluster.

In the Canopy System, the point-to-point link is achieved utilizing backhaul modules in either the

5.2GHz or 5.7 GHz band. The backhaul modules utilize passive reflector to achieve distances of up to 35 miles (56 km). Note: Distances may vary based on terrain and other line of sight issues.

In its basic form the point-to-point link is made up of a backhaul timing master and a backhaul timing slave. The cluster management module is key to the operation of the Canopy System. Backhaul timing masters must be connected to a cluster management module so that a GPS timing pulse can synchronize their transmission cycles. If one backhaul timing master module were to not be synchronized then it may be transmitting during a receive cycle of the other modules and cause de-sense. This is also true of the Canopy access point modules.

The following are some simple network diagrams of the proper way to layout single and multi- hopped point-to-point links.

Example 1: The single hop.

Canopy	Canopy
Backhaul	Backhaul
Master	Slave

Example 2: The multiple hop with the backhaul master modules at the ends of the link.

Backhaul User Manual Issue 3

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