Guardian Manual 001-5006-000 Rev 0
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2.2.6
NETWORK USING A GUARDIAN FOR ONLINE DIAGNOSTICS
The Network Using a Guardian for Online Diagnostics configuration has the following characteristics:
Master station may be full duplex (duplexer dual antennas required), half duplex or simplex
Accumulated online diagnostics are available at a monitoring site (monitoring site must be in range of all
remotes)
Online Diagnostics are available in real time at the monitoring site
Remote Offline Diagnostics, statistics, and control are available from the monitoring site by temporarily
disabling network activity (best if using a Master Station Antenna System)
Online Diagnostics are accumulated in the monitoring Guardian for the last 15 stations heard. This information
may be viewed using the Online Diagnostics utility. For larger networks, the Guardian can output raw diagnostic
data through the Setup port which may be interpreted for network management by the Field Programming
Software Online Diagnostics utility or by a user-supplied software program. Contact your sales representatives for
more information.
2.2.7
UNDERSTANDING RF PATH REQUIREMENTS
Radio waves are propagated when electrical energy produced by a radio transmitter is converted into magnetic
energy by an antenna. Magnetic waves travel through space. The receiving antenna intercepts a very small
amount of this magnetic energy and converts it back into electrical energy that is amplified by the radio receiver.
The energy received by the receiver is called the Received Signal Strength Indication (RSSI) and is measured in
dBm.
A radio modem requires a minimum amount of received RF signal to operate reliably and provide adequate data
throughput. This is the radio’s receiver sensitivity. In most cases, spectrum regulators will define or limit the
amount of signal that can be transmitted and it will be noted on the FCC license. This is the effective isotropic
radiated power (EIRP
)
.
Transmitted power decays with distance and other factors as it moves away from the
transmitting antenna.
2.3
SITE SELECTION AND SITE SURVEY
2.3.1
SITE SELECTION
For a successful installation, careful thought must be given to selecting the site for each radio. These requirements
can be quickly determined in most cases. Suitable sites should provide the following:
Protection from direct weather exposure
A source of adequate and stable primary power
Suitable entrances for antenna, interface, or other cabling
Antenna location with an unobstructed transmission path to all remote radios in the system
