Motorola Canopy Backhaul Module - Manual (Page 13)

Backhaul User Manual Issue 3 Page 13 of 53
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
5.2 GHz 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
Backhaul
Master Canopy
Backhaul
Slave
Example 2: The multiple hop with the backhaul master modules at the ends of the
link.