User's Manual

2 Spread Spectrum Radio System User’s Manual
March 2001
uses several small repeaters, as shown in the following simplified
diagram:
Figure 1 SSR System Configuration, Simplified
Each repeater extends the base station’s area of coverage and
communicates with the base station by way of other repeaters or
directly by way of a fiber optic cable.
The base station uses redundant radios to ensure continued operation
in case a radio fails. Likewise, primary routing paths between
repeaters incorporate alternative routing paths in case a repeater
fails. The mine can optionally add repeaters to provide redundancy to
whatever extent is desired.
Initial installation is expedient in part because the ISM frequency
band is license free, and there are no delays associated with license
applications. Nor are there licensing fees. The system’s inherent
architecture makes adding repeaters to an installed system
practically effortless, and mobile repeaters are easily deployed to
cover new work areas as the mine’s topography changes.
The mobile equipment system and the repeater system are described
in the following sections.
Base
Station
Redundant
Repeater
Ethernet